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Find video protocols related to scientific articles indexed in Pubmed.
Spatholobus suberectus inhibits osteoclastogenesis and stimulates chondrogenesis.
Am. J. Chin. Med.
PUBLISHED: 09-23-2014
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This study was carried out to investigate the effect of Spatholobus suberectus Dunn (SS) on the protection of chondral defect and inhibition of osteoclastogenesis. To examine these effects, we measured the matrix metalloproteinase (MMP) levels in SW1353 chondrosarcoma cells and performed tartrate-resistant acid phosphatase (TRAP) staining in bone marrow macrophage (BMM)-derived osteoclasts. To investigate the anti-osteoarthritis (OA) effects, we assessed TNF-?-induced MMP-1, -3, -9 and tissue inhibitors of matrix metalloproteinase (TIMP) expression levels in SW1353 cells. We observed that SS extract significantly inhibited MMP and TIMP expression in SW1353 cells. Also, SS extract inhibited the receptor activator of nuclear factor-?B ligand (RANKL)-induced osteoclast differentiation. These results suggest that SS extract may have a potential in the treatment of bone loss and chondral defect by suppressing osteoclast differentiation and decreasing the expression of OA factors. Therefore, clarification of the mechanism of the action of SS extract and its active components is needed.
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Effects of nefopam on streptozotocin-induced diabetic neuropathic pain in rats.
Korean J Pain
PUBLISHED: 08-22-2014
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Nefopam is a centrally acting non-opioid analgesic agent. Its analgesic properties may be related to the inhibitions of monoamine reuptake and the N-methyl-D-aspartate (NMDA) receptor. The antinociceptive effect of nefopam has been shown in animal models of acute and chronic pain and in humans. However, the effect of nefopam on diabetic neuropathic pain is unclear. Therefore, we investigated the preventive effect of nefopam on diabetic neuropathic pain induced by streptozotocin (STZ) in rats.
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Delphinidin suppresses PMA-induced MMP-9 expression by blocking the NF-?B activation through MAPK signaling pathways in MCF-7 human breast carcinoma cells.
J Med Food
PUBLISHED: 07-07-2014
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Matrix metalloproteinase-9 (MMP-9) plays an important role in the invasion and metastasis of cancer cells. The synthesis and secretion of MMP-9 can be stimulated by a variety of stimuli, including cytokines and phorbol 12-myristate 13-acetate (PMA), during various pathological processes, such as tumor invasion, atherosclerosis, inflammation, and rheumatoid arthritis, whereas MMP-2 is usually expressed constitutively. Delphinidin, an anthocyanidin present in pigmented fruits and vegetables, possesses potent antioxidant, anti-inflammatory, and antiangiogenic properties. In this study, we investigated the antiproliferative and antiinvasive effects of delphinidin on PMA-induced MMP-9 expression in MCF-7 human breast carcinoma cells using zymography, western blotting, reverse transcription-polymerase chain reaction, and Matrigel invasion assay. Delphinidin significantly suppressed PMA-induced MMP-9 protein expression in MCF-7 human breast carcinoma cells, and it also inhibited the MMP-9 gene transcriptional activity by blocking the activation of NFkappaB (NF-?B) through MAPK signaling pathways. Moreover, the Matrigel invasion assay showed that delphinidin reduces PMA-induced cancer cell invasion. These results suggest that delphinidin is a potential antimetastatic agent that suppresses PMA-induced cancer cell invasion through the specific inhibition of NF-?B-dependent MMP-9 gene expression.
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Perineural pretreatment of bee venom attenuated the development of allodynia in the spinal nerve ligation injured neuropathic pain model; an experimental study.
BMC Complement Altern Med
PUBLISHED: 06-27-2014
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Diluted bee venom is known to have anti-nociceptive and anti-inflammatory effects. We therefore assessed whether perineural bee venom pretreatment could attenuate the development of neuropathic pain in the spinal nerve ligation injured animal model.
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SB365, Pulsatilla saponin D, suppresses the growth of gefitinib-resistant NSCLC cells with Met amplification.
Oncol. Rep.
PUBLISHED: 06-04-2014
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Clinical treatment using epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) such as gefitinib or erlotinib has been applied in patients with non-small cell lung cancers (NSCLCs). Unfortunately, acquired drug resistance emerges in these patients due to the amplification of the Met proto-oncogene, which may be a compensatory mechanism of NSCLCs against EGFR inhibition. To overcome this resistance, identification of new small-molecule natural compounds is crucial for cancer therapeutics. In this regard, SB365, saponin D from the root of Pulsatilla koreana which has been used as a traditional medicine in Korea for several diseases, has attracted wide interest. In the present study, SB365 effectively suppressed the proliferation of gefitinib-resistant HCC827GR NSCLC cells with Met amplification. Notably, our data revealed that SB365 inhibited the phosphorylation of Met and the downstream signaling pathway required for growth and survival in the Met-amplified HCC827GR cells. Moreover, SB365 suppressed the anchorage-independent growth, migration and invasion along with induction of apoptosis in the HCC827GR cells. Therefore, these results suggest that SB365 is good candidate as a natural product for use in the treatment of Met-amplified NSCLCs.
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Cudarflavone B provides neuroprotection against glutamate-induced mouse hippocampal HT22 cell damage through the Nrf2 and PI3K/Akt signaling pathways.
Molecules
PUBLISHED: 05-21-2014
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Oxidative cell damage contributes to neuronal degeneration in many central nervous system (CNS) diseases such as Alzheimer's disease, Parkinson's disease, and ischemia. Nrf2 signaling-mediated heme oxygenase (HO)-1 expression acts against oxidants that are thought to play a key role in the pathogenesis of neuronal diseases. Cudraflavone B is a prenylated flavone isolated from C. tricuspidata which has shown anti-proliferative activity, mouse brain monoamine oxidase (MAO) inhibitory effects, apoptotic actions in human gastric carcinoma cells and mouse melanoma cells, and hepatoprotective activity. In this study, cudraflavone B showed neuroprotective effects and reactive oxygen species (ROS) inhibition against glutamate-induced neurotoxicity by inducing the expression of HO-1 in mouse hippocampal HT22 cells. Furthermore, cudraflavone B caused the nuclear accumulation of nuclear factor-E2-related factor 2 (Nrf2) and increased the promoter activity of antioxidant response elements (ARE) in mouse hippocampal HT22 cells. In addition, we found that the Nrf2-midiated HO-1 expression by cudraflavone B is involved in the cell protective response and ROS reductions, and cudraflavone B-induced expression of HO-1 was mediated through the phosphatidylinositol 3-kinase (PI3K)/Akt pathway in HT22 cells. Our results demonstrated the potential application of naturally occurring cudraflavone B as a therapeutic agent from neurodegenerative disease.
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Access to medical services in korean people with spinal cord injury.
Ann Rehabil Med
PUBLISHED: 04-29-2014
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To investigate the accessibility of medical services for Korean people with spinal cord injury (SCI) compared to the control group (CG) and to evaluate significantly related factors.
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The cytoprotective effect of sulfuretin against tert-butyl hydroperoxide-induced hepatotoxicity through Nrf2/ARE and JNK/ERK MAPK-mediated heme oxygenase-1 expression.
Int J Mol Sci
PUBLISHED: 03-26-2014
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Sulfuretin is one of the major flavonoid components in Rhus verniciflua Stokes (Anacardiaceae) isolates. In this study, we investigated the protective effects of sulfuretin against tert-butyl hydroperoxide (t-BHP)-induced oxidative injury. The results indicated that the addition of sulfuretin before t-BHP treatment significantly inhibited cytotoxicity and reactive oxygen species (ROS) production in human liver-derived HepG2 cells. Sulfuretin up-regulated the activity of the antioxidant enzyme heme oxygenase (HO)-1 via nuclear factor E2-related factor 2 (Nrf2) translocation into the nucleus and increased the promoter activity of the antioxidant response element (ARE). Moreover, sulfuretin exposure enhanced the phosphorylation of c-Jun N-terminal kinase (JNK) and extracellular signal-regulated kinase 1/2 (ERK1/2), which are members of the mitogen-activated protein kinase (MAPK) family. Furthermore, cell treatment with a JNK inhibitor (SP600125) and ERK inhibitor (PD98059) reduced sulfuretin-induced HO-1 expression and decreased its protective effects. Taken together, these results suggest that the protective effect of sulfuretin against t-BHP-induced oxidative damage in human liver-derived HepG2 cells is attributable to its ability to scavenge ROS and up-regulate the activity of HO-1 through the Nrf2/ARE and JNK/ERK signaling pathways. Therefore, sulfuretin could be advantageous as a bioactive source for the prevention of oxidative injury.
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Complete NMR assignments of undegraded asterosaponins from Asterias amurensis.
Arch. Pharm. Res.
PUBLISHED: 03-18-2014
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Four asterosaponins, thornasteroside A (1), versicoside A (2), anasteroside B (3), and asteronylpentaglycoside sulfate (4), were isolated from the predatory starfish Asterias amurensis Lütken. Unlike previous studies focusing on structure elucidation by degradation of the complex saponin molecules, complete nuclear magnetic resonance (NMR) assignment for the intact molecules was accomplished using 600 MHz high magnetic field NMR. The complete set of NMR assignments can help in the structure elucidation of asterosaponins isolated in low yields without resorting to chemical degradation. Furthermore, this approach can be extended to other complex steroidal saponins, which may accelerate the discovery of bioactive secondary metabolites from this invasive starfish species.
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Multifunctional inverted nanocone arrays for non-wetting, self-cleaning transparent surface with high mechanical robustness.
Small
PUBLISHED: 02-19-2014
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A multifunctional surface that enables control of wetting, optical reflectivity and mechanical damage of nanostructured interfaces is presented. Our approach is based on imprinting a periodic array of nanosized cones into a UV-curable polyurethane acrylate (PUA), resulting in a self-reinforcing egg-crate topography evenly distributed over large areas up to several cm(2) in size. The resulting surfaces can be either superhydrophilic or superhydrophobic (through subsequent application of an appropriate chemical coating), they minimize optical reflection losses over a broad range of wavelengths and a wide range of angles of incidence, and they also have enhanced mechanical resilience due to greatly improved redistribution of the normal and shearing mechanical loads. The transmissivity and wetting characteristics of the nanoscale egg-crate structure, as well as its resistance to mechanical deformation are analyzed theoretically. Experiments show that the optical performance together with self-cleaning or anti-fogging behavior of the inverted nanocone topography is comparable to earlier designs that have used periodic arrays of nanocones to control reflection and wetting. However the egg-crate structures are far superior in terms of mechanical robustness, and the ability to replicate this topography through several generations is promising for large-scale commercial applications where multifunctionality is important.
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Sex determination using upper limb bones in Korean populations.
Anat Cell Biol
PUBLISHED: 02-10-2014
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The purpose of this research is to establish metric standards for the determination of sex from the upper limb bones of Korean. We took a set of eleven measurements on each of 175 right sides of adult skeletons chosen at Korean sample. Classification accuracy dropped only one or two individuals when only vertical head diameter of humerus is used. Variables in relation with maximal length were less accurate than head diameter of humerus. Two variables were selected by the stepwise procedure: maximal length of humerus, vertical head diameter of humerus. The combined accuracy was 87%. This study of modern Korean skeletons underscores the need for population-specific techniques, not only for medicolegal investigations, but also for the study of population affinities and factors affecting bone configurations.
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Modulation of Atg5 expression by globular adiponectin contributes to autophagy flux and suppression of ethanol-induced cell death in liver cells.
Food Chem. Toxicol.
PUBLISHED: 02-08-2014
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Globular adiponectin (gAcrp) protects liver cells from ethanol-induced apoptosis via induction of autophagy. However, the underlying mechanisms are unknown. The present study aims to investigate the potential role of autophagy-related protein 5 (Atg5), an essential Atg for the elongation of autophagosomes, in suppression of ethanol-induced cytotoxicity by gAcrp. Here, we demonstrated that suppression of Atg5 expression by ethanol was restored by pretreatment with gAcrp both in primary rat hepatocytes and human hepatoma cell line (HepG2). Moreover, ethanol-induced accumulation of p62 (sequestosome1), a marker of autophagic flux, was restored by gAcrp treatment, implying that gAcrp modulates autophagic flux in liver cells. Further, Atg5 silencing prevented p62 degradation by gAcrp, suggesting that Atg5 plays a critical role in induction of autophagic flux by gAcrp. Interestingly, gene silencing of Atg5 by siRNA abrogated restoration of autophagosome formation by gAcrp in ethanol-treated cells. Finally, protection of liver cells by gAcrp from ethanol-induced apoptosis was also significantly attenuated by knocking-down of Atg5 expression, suggesting an important role of Atg5 in autophagy induction and cellular apoptosis modulated by gAcrp. Taken together, our data demonstrated that Atg5 expression, at least in part, is implicated in gAcrp-induced autophagy and subsequent anti-apoptotic effects in ethanol-treated liver cells.
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Pes anserinus and anserine bursa: anatomical study.
Anat Cell Biol
PUBLISHED: 02-06-2014
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This study investigated the boundary of anserine bursa with the recommended injection site and shape on the insertion area of pes anserinus (PA), with the aim of improving clinical practice. Eighty six legs from 45 Korean cadavers were investigated. The mixed gelatin solution was injected to identify the shape of anserine bursa, and then the insertion site of the PA tendons was exposed completely and carefully dissected to identify the shape of the PA. The sartorius was inserted into the superficial layer and gracilis, and the semitendinosus was inserted into the deep layer on the medial surface of the tibia. The number of the semitendinosus tendons at the insertion site varied: 1 in 66% of specimens, 2 in 31%, and 3 in 3%. The gracilis and semitendinosus tendons were connected to the deep fascia of leg. Overall, the shape of the anserine bursa was irregularly circular. Most of the anserine bursa specimens reached the proximal line of the tibia, and some of the specimens reached above the proximal line of the tibia. In the medial view of the tibia, the anserine bursa was located posteriorly and superiorly from the tibia's midline, and it followed the lines of the sartorius muscle. The injection site for anserine bursa should be carried out at 20° from the vertical line medially and inferiorly, 15 or 20 mm deeply, and at the point of about 20 mm medial and 12 mm superior from inferomedial point of tibial tuberosity.
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Hair zinc levels and the efficacy of oral zinc supplementation in patients with atopic dermatitis.
Acta Derm. Venereol.
PUBLISHED: 01-30-2014
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Zinc deficiency in patients with atopic dermatitis (AD) and the use of zinc supplementation is still controversial. We measured hair zinc levels in 58 children with AD and 43 controls (age range 2-14 years). We also investigated the efficacy of oral zinc supplementation in AD patients with low hair zinc levels by comparing eczema assessment severity index (EASI), transepidermal water loss (TEWL), and visual analogue scales for pruritus and sleep disturbance in patients receiving zinc supplementation (Group A) and others not receiving supplementation (Group B). At baseline, the mean zinc level was significantly reduced in AD patients (113.1 ?g/g vs. 130.9 ?g/g, p?=?0.012). After 8 weeks of supplement, hair zinc level increased significantly in Group A (p?
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Arylbenzofuran isolated from Dalbergia odorifera suppresses lipopolysaccharide-induced mouse BV2 microglial cell activation, which protects mouse hippocampal HT22 cells death from neuroinflammation-mediated toxicity.
Eur. J. Pharmacol.
PUBLISHED: 01-28-2014
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Neuroinflammation is a key mechanism against infection, injury, and trauma in the central nervous system (CNS). The heartwood of Dalbergia odorifera T. Chen is an important source of traditional Korean and Chinese medicines. (2R, 3R)-Obtusafuran (1) and isoparvifuran (2) are arylbenzofuran compounds isolated from D. odorifera. This study determined the efficacy of (1) and (2) in modulating the regulation of anti-inflammatory activity through the upregulation of heme oxygenase (HO)-1 in BV2 microglia. Compound (1) inhibited the protein expression of inducible nitric oxide synthase (iNOS), iNOS-derived nitric oxide (NO), cyclooxygenase (COX)-2, and COX-2-derived prostaglandin E2 (PGE2) in lipopolysaccharide (LPS)-stimulated mouse BV2 microglia. (2R, 3R)-Obtusafuran (1) also reduced tumor necrosis factor-? (TNF-?) and interleukin-1? (IL-1?) production, and these anti-neuroinflammatory effects were shown to be correlated with the suppression of the phosphorylation and degradation of inhibitor of nuclear factor kappa B-? (I?B-?), and nuclear factor kappa B nuclear (NF-?B) translocation and DNA binding activity. In addition, (1) upregulated HO-1 expression via nuclear translocation of nuclear factor E2-related factor 2 (Nrf2) in mouse BV2 microglia. Using tin protoporphyrin (SnPP), an HO activity inhibitor, we verified that the inhibitory effects of (1) on the proinflammatory mediators and proteins were associated with the induction of HO-1 expression. Activated microglia-mediated cell death of mouse hippocampal HT22 cells was significantly repressed by (1). Our data suggest that (2R, 3R)-obtusafuran (1) has therapeutic potential against neurodegenerative diseases caused by neuroinflammation.
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Cudratricusxanthone A protect pancreatic beta cells from cytokines-mediated toxicity through the inhibition of NF-?B and STAT pathways.
Int. Immunopharmacol.
PUBLISHED: 01-27-2014
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Cudratricusxanthone A (CTXA) has an isoprenylated xanthone skeleton that is known to exert a variety of biological activities, including anti-inflammatory, neuroprotective, hepatoprotective, anti-proliferative, and mono-amine oxidase inhibitory effects. In this study, we investigated the effect of CTXA on IL-1? (5 ng/ml) and IFN-? (100 U/ml)-induced ?-cell damage. Pre-treatment with CTXA increased the viability and reactive oxygen species (ROS) inhibition of cytokine-treated RINm5F cells at concentrations of 1-10 ?M. CTXA prevented nitric oxide (NO) production, and this effect was correlated with reduced levels of protein and mRNA expression of inducible nitric oxide synthase (iNOS). The molecular mechanism by which CTXA inhibits iNOS gene expression appeared to involve the inhibition of NF-?B activation. Moreover, pancreatic ?-cells treated with cytokines upregulated the phosphorylation of STAT-1, STAT-3 and STAT-5; however, pretreatment with CTXA attenuated these effects. Additionally, in a second set of experiments in which rat islets were used, the protective effects of CTXA in rat islets were essentially the same as those observed when RINm5F cells were used. CTXA prevented cytokines-induced NO production, iNOS expression, JAK/STAT activation, and NF-?B activation and inhibition of glucose-stimulated insulin secretion (GSIS). Collectively, these results suggest that CTXA can be used for the prevention of functional ?-cell damage.
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The neoflavonoid latifolin isolated from MeOH extract of Dalbergia odorifera attenuates inflammatory responses by inhibiting NF-?B activation via Nrf2-mediated heme oxygenase-1 expression.
Phytother Res
PUBLISHED: 01-01-2014
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In Korea and China, the heartwood of Dalbergia odorifera T. Chen is an important traditional medicine used to treat blood disorders, ischemia, swelling, and epigastric pain. In this study, we investigated the inhibitory effects of latifolin, a major neoflavonoid component isolated from the MeOH extract of D.?odorifera, on the inflammatory reaction of thioglycollate-elicited peritoneal macrophages exposed to lipopolysaccharide, with a particular focus on heme oxygenase-1 (HO-1) expression and nuclear factor-?B (NF-?B) signaling. Latifolin significantly inhibited the protein and mRNA expression of inducible nitric oxide synthase and COX-2, reduced NO, prostaglandins E2, tumor necrosis factor-?, and interleukin-1? production in primary murine peritoneal macrophages exposed to lipopolysaccharide. Latifolin also suppressed inhibitor ?B-? levels, NF-?B nuclear translocation, and NF-?B DNA-binding activity. Furthermore, latifolin upregulated HO-1 expression via nuclear transcription factor-E2-related factor 2 (Nrf2) nuclear translocation. In addition, using inhibitor tin protoporphyrin IX (SnPP), an inhibitor of HO-1, it was verified that the inhibitory effects of latifolin on the proinflammatory mediators and NF-?B DNA-binding activity were associated with the HO-1 expression. These results suggested that the latifolin-mediated up-regulation of HO-1 expression played a critical role in anti-inflammatory effects in macrophages. This study therefore identified potent therapeutic effects of latifolin, which warrants further investigation as a potential treatment for inflammatory diseases.
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All-trans-retinoic acid rescues neurons after global ischemia by attenuating neuroinflammatory reactions.
Neurochem. Res.
PUBLISHED: 06-09-2013
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Retinoic acid (RA) plays an important role in the developing mammalian nervous system. Based on this concept, some studies have demonstrated the beneficial effects of RA administration on neurogenesis in neuropathological diseases. Some investigations have revealed the anti-inflammatory effects of RA treatment in multiple systems, in addition to its role in neurogenesis. To date, however, the neuroprotective efficacy of RA after cerebral ischemia, especially in the context of its anti-inflammatory effects, has been poorly demonstrated. Additionally, to the best of our knowledge, experiments of the therapeutic efficacy of RA treatment in a transient global ischemic model in the Mongolian gerbil have been lacking worldwide. Here, we studied the neuroprotective effects and neurobehavioral outcomes of intraperitoneally administered all-trans-RA (ATRA; a synthetic form of RA) on brains with transient global ischemia that was induced with the bilateral common carotid artery occlusion and reperfusion (BCCAO/R) model in the gerbil. In order to identify whether these neuroprotective mechanisms were due to the anti-inflammatory effects of ATRA, in vivo hippocampal expression of proinflammatory cytokines including tissue necrosis factor-alpha (TNF-?), and interleukin-6 (IL-6) after ATRA injection and in vitro levels of release of nitric oxide, TNF-? and IL-6 from lipopolysaccharide (LPS)-stimulated BV2 microglial cells after ATRA treatment were evaluated. The results showed that ATRA can protect pyramidal neurons in the hippocampal CA1 region against BCCAO-induced neuronal apoptosis and significantly reduce the extent of astrocytosis and microglial activation. In addition, the ischemia-induced neurobehavioral changes were normalized by ATRA injection. Consistent with these phenotypic data, we observed the diminishing effects of ATRA treatment on the production of proinflammatory mediators (e.g., TNF-? and IL-6) in hippocampal homogenates and LPS-stimulated BV2 cells, and these effects were dose-dependent. These results suggest a beneficial role of ATRA in the attenuation of global cerebral ischemia due to its anti-inflammatory properties, resulting in, at least partly, the inhibition of microglial secretion of variable proinflammatory cytokines.
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In vitro and in vivo hepatoprotective effect of ganodermanontriol against t-BHP-induced oxidative stress.
J Ethnopharmacol
PUBLISHED: 05-31-2013
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Ganoderma lucidum (Fr.) Karst. (Ganodermataceae) is a mushroom which is used as a traditional remedy in the treatment of human diseases such as hepatitis, liver disorders, hypercholesterolemia, arthritis, bronchitis and tumorigenic diseases. This study targets the evaluation of hepatoprotective activity of ganodermanontriol, a sterol isolated from Ganoderma lucidum, and the investigation of its mechanism of action in Hepa1c1c7 and murine liver cells upon tert-butyl hydroperoxide (t-BHP)-induced inflammation. t-BHP was utilized to stimulate an anti-inflammatory reaction in the hepatic cell lines and murine hepatic tissue examined. Western blot and reverse transcription-quantitative polymerase chain reaction (RT-PCR) were used to estimate the expression of ganodermanontriol (GDT)-induced proteins, including heme oxidase-1 (HO-1) and mitogen-activated protein kinases (MAPKs) as well as the corresponding mRNA. Luciferase assays were conducted to evaluate the interaction between NF-E2-related factor-2 (Nrf-2), the antioxidant response element (ARE), and the promoter region of the HO-1 gene and subsequent gene expression. Biochemical markers for hepatotoxicity were monitored to assess whether GDT protected the cells from the t-BHP-mediated oxidative stimuli.
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Effects of transforaminal balloon treatment in patients with lumbar foraminal stenosis: a randomized, controlled, double-blind trial.
Pain Physician
PUBLISHED: 05-25-2013
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Lumbar spinal stenosis is a common condition in the elderly. Although balloon treatment is a well-known therapeutic method in specific pain conditions, applying the balloon treatment in patients with lumbar spinal stenosis is not yet well established.
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Transforaminal hypertonic saline for the treatment of lumbar lateral canal stenosis: a double-blinded, randomized, active-control trial.
Pain Physician
PUBLISHED: 05-25-2013
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Degenerative lumbar spinal stenosis is one of the most common causes of chronic lower back pain and radiculopathy. Spinal stenosis is anatomically classified as central and lateral spinal canal stenosis. Many treatment modalities and techniques, including surgery and epidural injection, have been used to manage the pain. However, the effect of hypertonic saline injection via the transforaminal approach has not yet been studied.
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Inhibitory effect of 9-hydroxy-6,7-dimethoxydalbergiquinol from Dalbergia odorifera on the NF-?B-related neuroinflammatory response in lipopolysaccharide-stimulated mouse BV2 microglial cells is mediated by heme oxygenase-1.
Int. Immunopharmacol.
PUBLISHED: 05-07-2013
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The heartwood of Dalbergia odorifera T. Chen (Leguminosae) is an important source of traditional Korean and Chinese medicines. 9-Hydroxy-6,7-dimethoxydalbergiquinol (HDDQ), a compound isolated from D. odorifera, has various biological activities. The aim of this study was to determine the efficacy of HDDQ in modulating the regulation of anti-inflammatory activity through the upregulation of heme oxygenase (HO)-1 in BV2 microglia. HDDQ inhibited the protein expression of inducible nitric oxide synthase (iNOS), iNOS-derived nitric oxide (NO), and the production of cyclooxygenase (COX)-2 and COX-2-derived prostaglandin E2 (PGE2) in lipopolysaccharide (LPS)-stimulated mouse BV2 microglia. HDDQ also reduced tumor necrosis factor-? (TNF-?) and interleukin-1? (IL-1?) production, and suppressed the phosphorylation and degradation of I?B-? and the nuclear translocation of p65 in mouse BV2 microglia in response to LPS. Furthermore, HDDQ upregulated HO-1 expression via nuclear translocation of nuclear factor E2-related factor 2 (Nrf2) in mouse BV2 microglia. Using tin protoporphyrin (SnPP), an HO activity inhibitor, we verified that the inhibitory effects of HDDQ on the proinflammatory mediators NO, PGE2, TNF-?, and IL-1?, and nuclear factor kappa B (NF-?B) DNA-binding activity are associated with the induction of HO-1 expression. Our data suggest that HDDQ has therapeutic potential against neurodegenerative diseases caused by neuroinflammation.
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4,2,5-trihydroxy-4-methoxychalcone from Dalbergia odorifera exhibits anti-inflammatory properties by inducing heme oxygenase-1 in murine macrophages.
Int. Immunopharmacol.
PUBLISHED: 02-28-2013
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Dalbergia odorifera T. Chen (Leguminosae) has traditionally been used as an ingredient in East Asian medicines to treat various diseases. In the present study, 4,2,5-trihydroxy-4-methoxychalcone (TMC), a biologically active chalcone isolated from the heartwood of D. odorifera, inhibited cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expression, leading to a reduction in COX-2-induced prostaglandin E2 (PGE2) and iNOS-induced nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated murine peritoneal macrophages. Furthermore, TMC suppressed tumor necrosis factor-? (TNF-?) and interleukin-1? (IL-1?) production, and the phosphorylation and degradation of I?B-? as well as the LPS-stimulated nuclear translocation of p65 in macrophages. The present study also demonstrated that TMC induced heme oxygenase-1 (HO-1) expression through the nuclear translocation of nuclear factor E2-related factor 2 (Nrf2) in macrophages. The effects of TMC on LPS-induced NO, PGE2, tumor necrosis factor (TNF)-?, and interleukin (IL)-1? production were partially reversed by the HO inhibitor tin protoporphyrin (SnPP). These results suggest that TMC inhibits pro-inflammatory mediators by inducing the expression of anti-inflammatory HO-1 via the Nrf2 pathway.
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6,4-Dihydroxy-7-methoxyflavanone inhibits osteoclast differentiation and function.
Biol. Pharm. Bull.
PUBLISHED: 02-19-2013
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6,4-Dihydroxy-7-methoxyflavanone (DMF) is a flavonoid isolated from Heartwood Dalbergia odorifera. It has been known that DMF has antioxidant, anti-inflammatory and neuroprotective effects. DMF, however, the efficacy of bone related diseases has not been reported. In this study, we determined DMFs efficacy on osteoclasts differentiation and function using in vitro bone marrow macrophage osteoclast differentiation culture system. DMF inhibited receptor activators of nuclear factor kappa-B ligand (RANKL) induced osteoclastogenesis dose dependently. In addition, DMF decreased osteoclast function through disruption of actin ring formation and consequently suppression of the pit-forming activity of mature osteoclasts. Mechanistically, DMF inhibited RANKL-induced expression of nuclear factor of activated T-cells, cytoplasmic, calcineurin-dependent 1 (NFATc1) and c-Fos via inhibition of mitogen activated protein kinases (MAPKs) pathway. Collectively, the inhibition of osteoclasts differentiation and function by DMF suggests that DMF can be a potential therapeutic molecule for osteoclastogenic bone diseases such osteoporosis, rheumatoid arthritis and periodontal diseases.
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Butein protects human dental pulp cells from hydrogen peroxide-induced oxidative toxicity via Nrf2 pathway-dependent heme oxygenase-1 expressions.
Toxicol In Vitro
PUBLISHED: 01-03-2013
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Rhus verniciflua Stokes is a plant that is native to East Asian countries, such as Korea, China, and Japan. Butein, a plant polyphenol, is one of the major active components of R. verniciflua. Reactive oxygen species (ROS), produced via dental adhesive bleaching agents and pulpal disease, can cause oxidative stress. Here, we found that butein possesses cytoprotective effects on hydrogen peroxide (H2O2)-induced dental cell death. H2O2 is a representative ROS and causes cell death through necrosis in human dental pulp (HDP) cells. H2O2-induced cytotoxicity and production of ROS were blocked in the presence of butein, and these effects were dose dependent. Butein also increased heme oxygenase-1 (HO-1) protein expression and HO activity. In addition, butein-dependent HO-1 expression was required for the inhibition of H2O2-induced cell death and ROS generation. Furthermore, butein treatment caused nuclear accumulation of nuclear factor-E2-related factor 2 (Nrf2) and increased the promoter activity of antioxidant response elements (AREs). Treatment of HDP cells with a c-Jun NH2-terminal kinase (JNK) inhibitor also reduced butein-induced HO-1 expression, and butein treatment led to increased JNK phosphorylation. These results indicate that butein may be used to prevent functional dental cell death and thus may be useful as a pulpal disease agent.
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Nano-sized Ni-doped carbon aerogel for supercapacitor.
J Nanosci Nanotechnol
PUBLISHED: 11-30-2011
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Carbon aerogel was prepared by polycondensation of resorcinol with formaldehyde using sodium carbonate as a catalyst in ambient conditions. Nano-sized Ni-doped carbon aerogel was then prepared by a precipitation method in an ethanol solvent. In order to elucidate the effect of nickel content on electrochemical properties, Ni-doped carbon aerogels (21, 35, 60, and 82 wt%) were prepared and their performance for supercapacitor electrode was investigated. Electrochemical properties of Ni-doped carbon aerogel electrodes were measured by cyclic voltammetry at a scan rate of 10 mV/sec and charge/discharge test at constant current of 1 A/g in 6 M KOH electrolyte. Among the samples prepared, 35 wt% Ni-doped carbon aerogel (Ni/CA-35) showed the highest capacitance (110 F/g) and excellent charge/discharge behavior. The enhanced capacitance of Ni-doped carbon aerogel was attributed to the faradaic redox reactions of nano-sized nickel oxide. Moreover, Ni-doped carbon aerogel exhibited quite stable cyclability, indicating long-term electrochemical stability.
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Tumor Necrosis Factor-alpha and Apoptosis Following Spinal Nerve Ligation Injury in Rats.
Korean J Pain
PUBLISHED: 10-24-2011
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Spinal nerve ligation (SNL) injury in rats produces a pain syndrome that includes mechanical and thermal allodynia. Previous studies have indicated that proinflammatory cytokines such as tumor necrosis factor-? (TNF-?) play an important role in peripheral mediation of neuropathic pain, and that altered dorsal root ganglion (DRG) function and degree of DRG neuronal apoptosis are associated with spinal nerve injury. The present study was conducted to evaluate the expression of TNF-? and the extent of apoptosis in the dorsal root ganglion after SNL in rats.
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Sauchinone suppresses pro-inflammatory mediators by inducing heme oxygenase-1 in RAW264.7 macrophages.
Biol. Pharm. Bull.
PUBLISHED: 10-04-2011
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Sauchinone, a biologically active lignan isolated from the roots of Saururus chinensis (LOUR.) BAILL. (Saururaceae), is reported to exert a variety of biological activities, such as hepatoprotective, anti-inflammatory actions and inhibitory effects on bone resorption. In this study, we investigated the effect of sauchinone in suppressing cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) expression, leading to a reduction in COX-2-derived prostaglandin E(2) (PGE(2)) and iNOS-derived nitric oxide (NO) production in lipopolysaccharide (LPS) stimulated RAW264.7 macrophages. Present study also demonstrates the effects of sauchinone in inducing heme oxygenase-1 (HO-1) expression and an increase in heme oxygenase (HO) activity in RAW264.7 macrophages. The effects of sauchinone on LPS-induced PGE(2), NO, tumor necrosis factor-? (TNF-?) and interlukine-1? (IL-1?) production were partially reversed by the HO-1 inhibitor Tin protoporphyrin was also seen in this study. In addition, we found that treatment with extracellular signal-regulated kinase (ERK) inhibitor (PD98059) reduced sauchinone-induced HO-1 expression. Sauchinone also increased ERK phosphorylation. These results suggest that sauchinone inhibits pro-inflammatory mediators through expression of anti-inflammatory HO-1 via ERK pathway.
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Successful treatment of cutaneous lesions of dermatomyositis with topical pimecrolimus.
Ann Dermatol
PUBLISHED: 08-06-2011
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Dermatomyositis (DM) is an idiopathic inflammatory process characterized by proximal muscle weakness and cutaneous lesions, such as the Gottrons sign, heliotrope rash, and erythematous photosensitive rash. Administration of systemic agents for the treatment of underlying systemic diseases leads to remission of the cutaneous lesions in many cases. However, cutaneous lesions may remain refractory to treatment. Pimecrolimus is a calcineurin inhibitor with combined anti-inflammatory and immunomodulatory activity. It has high affinity to the skin and low permeation potential, even in patients with acute skin inflammation and in those undergoing post-topical corticosteroid therapy. We herein report two DM patients whose cutaneous lesions were refractory to conventional treatment but showed dramatic response to topical pimecrolimus. The clinical outcomes suggest that topical pimecrolimus may be a good therapeutic alternative for the management of the cutaneous lesions of DM.
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Comparison of the spinal neuropathic pain induced by intraspinal injection of N-methyl-d-aspartate and quisquate in rats.
J Korean Neurosurg Soc
PUBLISHED: 07-11-2011
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Excitatory amino acids play important roles in the development of secondary pathology following spinal cord injury (SCI). This study was designed to evaluate morphological changes in the dorsal horn of the spinal cord and assess profiles of pain behaviors following intraspinal injection of N-methyl-D-aspartate (NMDA) or quisqualate (QUIS) in rats.
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Asperlin from the marine-derived fungus Aspergillus sp. SF-5044 exerts anti-inflammatory effects through heme oxygenase-1 expression in murine macrophages.
J. Pharmacol. Sci.
PUBLISHED: 06-25-2011
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Asperlin is a fungal metabolite isolated from Aspergillus sp. SF-5044. In the present study, we isolated asperlin from the marine-derived fungus Aspergillus sp. SF-5044 and demonstrated that it inhibited inducible nitric oxide synthase (iNOS) expression, reduced iNOS-derived NO, suppressed cyclooxygenase (COX)-2 expression, and reduced COX-derived prostaglandin (PG) E? production in lipopolysaccharide (LPS)-stimulated RAW264.7 and murine peritoneal macrophages. Similarly, asperlin reduced the production of tumor necrosis factor (TNF)-? and interleukin (IL)-1?. In addition, asperlin inhibited the phosphorylation and degradation of I?B-?, as well as the nuclear translocation of p65 caused by the stimulation of LPS in RAW264.7 macrophages. Furthermore, asperlin induced heme oxygenase (HO)-1 expression through nuclear translocation of nuclear factor E2-related factor 2 and increased HO activity in RAW264.7 macrophages. The effects of asperlin on the LPS-induced expression of iNOS and COX-2 and production of NO, PGE?, TNF-?, and IL-1? were partially reversed by a HO-1 inhibitor, tin protoporphyrin. These findings suggest that asperlin-induced HO-1 expression plays a role in the anti-inflammatory effects of asperlin in macrophages.
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Involvement of heme oxygenase-1 induction in the cytoprotective and immunomodulatory activities of 6,4-dihydroxy-7-methoxyflavanone in murine hippocampal and microglia cells.
Eur. J. Pharmacol.
PUBLISHED: 06-13-2011
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6,4-Dihydroxy-7-methoxyflavanone (DMF), a biologically active compound, was isolated from the heartwood of Dalbergia odorifera T. Chen (Leguminosae). The present study proposed to examine the role of DMF as an anti-oxidative and anti-inflammatory heme oxygenase-1 (HO-1) inducer in mouse hippocampal HT22 cells and BV2 microglia cells. The effect of DMF on cell viability was determined by MTT assay and the effects of DMF on pro-inflammatory enzymes and cytokines were analyzed by western blot and ELISA. Parameters such as DMF induced HO-1 protein immunocontents, HO activity and mitogen-activated protein kinases (MAPK) activation were also measured. DMF increased cellular resistance to oxidative injury caused by glutamate-induced cytotoxicity in HT22 cells, via JUN N-terminal kinase (JNK) pathway dependent HO-1 expression. Furthermore, DMF suppressed the lipopolysaccharide (LPS)-induced expression of pro-inflammatory enzymes and inflammatory mediators in BV2 microglia. DMF suppressed production of nitric oxide (NO), prostaglandin E2 (PGE(2)), tumor necrosis factor-? (TNF-?) and interleukin-1? (IL-1?), through extracellular signal-regulated kinase (ERK) pathway dependent HO-1 expression. This study indicates that DMF effectively modulates the regulation of anti-oxidative and anti-inflammatory action, via up-regulation of HO-1 in HT22 cells and BV2 microglia. These results suggest that DMF possesses therapeutic potentials against neurodegenerative diseases that are induced by oxidative stress and neuroinflammation.
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Adenosine triphosphate-sensitive potassium channel blockers attenuate the antiallodynic effect of R-PIA in neuropathic rats.
Anesth. Analg.
PUBLISHED: 05-05-2011
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Nerve injury can generate neuropathic pain. The accompanying mechanical allodynia may be reduced by the intrathecal administration of adenosine. The neuroprotective effects of adenosine are mediated by the adenosine triphosphate (ATP)-sensitive potassium (K(ATP)) channel. We assessed the relationship between the adenosine A1 receptor agonist, N?-(R)-phenylisopropyl adenosine (R-PIA), and K(ATP) channels to determine whether the antiallodynic effects of R-PIA are also mediated through K(ATP) channels in a rat nerve ligation injury model of neuropathic pain.
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Altered Purkinje cell responses and calmodulin expression in the spontaneously ataxic mouse, Pogo.
Eur. J. Neurosci.
PUBLISHED: 03-17-2011
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Ataxia is often associated with altered cerebellar motor control, a process in which Purkinje cells (PCs) play a principal role. Pogo mice display severe motor deficits characterized by an ataxic gait accompanying hindlimb hyperextension. Here, using whole-cell patch-clamp recordings, we show that parallel fiber (PF)-excitatory post-synaptic currents (PF-EPSCs) are reduced, paired-pulse facilitation (PPF) is increased and PF-PC long-term depression (LTD) is impaired in Pogo mice; in contrast, climbing-fiber EPSCs are preserved. In control mice, treatment with the calmodulin antagonist calmidazolium (5 ?m) impaired PPF and LTD. Notably, cerebellar calmodulin expression was significantly reduced in Pogo mice compared with control mice. Control PCs predominantly exhibited a tonic firing pattern, whereas the firing pattern in Pogo PCs was mainly a complex burst type. These results implicate alterations in PC responses and calmodulin content in the abnormal cerebellar function of Pogo mice.
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Bakuchicin induces vascular relaxation via endothelium-dependent NO-cGMP signaling.
Phytother Res
PUBLISHED: 02-10-2011
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Bakuchicin is a furanocoumarin derived from the seeds of Psoralea corylifolia. The aim of the present study was to investigate the effect of bakuchicin on vascular tone in rat aortic tissue. Bakuchicin induced a dose-dependent relaxation of phenylephrine-precontracted rat aorta which was abolished by removal of the endothelium. Pretreatment of the endothelium-intact aortic tissues with NG-nitro-L-arginine methylester (L-NAME) or 1H-[1,2,4]-oxadiazole-[4,3-?]-quinoxalin-1-one (ODQ) significantly inhibited the vascular relaxation induced by bakuchicin. Incubation with bakuchicin increased the production of cGMP in a concentration-dependent manner, and this effect was blocked by pretreatment with both L-NAME and ODQ. Vascular relaxation induced by bakuchicin was significantly inhibited by pretreatment with verapamil and diltiazem, but not by several other inhibitors including tetraethylammonium (TEA), glibenclamide, indomethacin, atropine or propranolol. These results suggested that bakuchicin-induced vasodilatation is closely associated with the endothelium-dependent nitric oxide (NO)/cGMP signaling pathway, with the possible involvement of L-type Ca(2+) channels.
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Anti-inflammatory effects of lindenenyl acetate via heme oxygenase-1 and AMPK in human periodontal ligament cells.
Eur. J. Pharmacol.
PUBLISHED: 02-07-2011
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The molecular basis for the anti-inflammatory effects of lindenenyl acetate (LA) was investigated in the lipopolysaccharide (LPS)-stimulated human periodontal ligament (HPDL) cell model. LA concentration-dependently inhibited LPS-induced inducible nitric oxide synthase (iNOS) derived nitric oxide (NO) and cyclooxygenase-2 (COX-2) derived prostaglandin E2 (PGE(2)) production in HPDL cells. LA also attenuated the production of LPS-induced tumor necrosis factor (TNF)-?, interleukin (IL)-1?, IL-6 and IL-12. LA stimulated heme oxygenase-1 (HO-1) protein expression and enzyme activity of HPDL cells in a dose-dependent manner. Pretreatment with the HO-1 inhibitor, tin protoporphyrin (SnPP), attenuated the inhibitory activities of LA on LPS-induced inflammatory NO, PGE(2), IL-1?, TNF-?, IL-6 and IL-12 production. LA induced translocation of Nrf-2. Furthermore, an inhibitor of JNK MAPK abolished LA-induced HO-1 expression. LA exposure up-regulated the levels of phosphorylated adenosine monophosphate-activated protein kinase (AMPK) and its upstream kinase activators, including LKB1 and Ca2+/calmodulin-dependent protein kinase kinase-II. Furthermore, compound C, a specific AMPK inhibitor, partially blocked the LA-induced anti-inflammatory effect. Taken together, these results indicate that LA has anti-inflammatory activity in HPDL cells that might be mediated by the HO-1, AMPK, JNK MAPK, and Nrf-2 pathways. Thus, LA may serve as a potential therapeutic agent in periodontal disease.
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Neuroprotective and anti-inflammatory effects of mollugin via up-regulation of heme oxygenase-1 in mouse hippocampal and microglial cells.
Eur. J. Pharmacol.
PUBLISHED: 01-13-2011
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Mollugin, a bioactive phytochemical isolated from Rubia cordifolia L. (Rubiaceae), exhibits antimutagenic activity, antitumor activity, antiviral activity, and inhibitory activity in arachidonic acid- and collagen-induced platelet aggregation. In this study, we investigated the effects of mollugin as a neuroprotective agent in glutamate-induced neurotoxicity in the mouse hippocampal HT22 cell line and as an anti-inflammatory agent in lipopolysaccharide-induced microglial activation in BV2 cells. Mollugin showed potent neuroprotective effects against glutamate-induced neurotoxicity and reactive oxygen species generation in mouse hippocampal HT22 cells. In addition, the anti-inflammatory effects of mollugin were demonstrated by the suppression of pro-inflammatory mediators, including pro-inflammatory enzymes (inducible nitric oxide synthase and cyclooxygenase-2) and cytokines (tumor necrosis factor-? and interleukin-6). Furthermore, we found that the neuroprotective and anti-inflammatory effects of mollugin were linked to the up-regulation of the expression of heme oxygenase (HO)-1 and the activity of HO in HT22 and BV2 cells. In addition, the effects of mollugin resulted in the nuclear accumulation of nuclear factor-E2-related factor 2 (Nrf2) in HT22 and BV2 cells. Furthermore, mollugin also activated the p38 mitogen-activated protein kinase (MAPK) pathway both in HT22 and BV2 cells. These results suggest that mollugin may be a promising candidate for the treatment of neurodegenerative diseases related to neuroinflammation.
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Butein from Rhus verniciflua protects pancreatic ? cells against cytokine-induced toxicity mediated by inhibition of nitric oxide formation.
Biol. Pharm. Bull.
PUBLISHED: 01-08-2011
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Butein (3,4,2,4-tetrahydroxychalcone), a plant polyphenol, is a major component in isolate of Rhus verniciflua STOKES (Anacardiaceae). It is shown to exert various potent effects such as antioxidant, antiinflammatory induction of apoptosis among many properties. In this study, we investigated the effect of butein on cytokine-induced ?-cell damage. Pre-treatment with butein is shown to increase the viability of cytokine-treated INS-1 cells at concentrations of 15-30 µM. Butein prevented cytokine-mediated cell death, as well as nitric oxide (NO) production, and these effects correlated well with reduced levels of protein expression of the inducible nitric oxide synthase (iNOS). Furthermore, the molecular mechanisms by which butein inhibits iNOS gene expression appeared to be through the inhibition of nuclear factor-?B (NF-?B) translocation. In a second set of experiments, rat islets were used to demonstrate the protective effects of butein and the results were essentially the same as those observed in Beutin pretreated INS-1 cells. Butein prevented cytokine-induced NO production, iNOS expression, and NF-?B translocation and inhibition of glucose-stimulated insulin secretion (GSIS). In conclusion, these results suggest that butein can be used for the prevention of functional ?-cell damage and preventing the progression of Type 1 diabetes mellitus (T1DM).
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Synergistic effect of emodin in combination with ampicillin or oxacillin against methicillin-resistant Staphylococcus aureus.
Pharm Biol
PUBLISHED: 10-07-2010
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Methicillin-resistant Staphylococcus aureus (MRSA) is a substantial contributor to morbidity and mortality. In search of a natural products capable of inhibiting this multidrug resistant bacteria, we have investigated the antimicrobial activity of emodin (EM) isolated from Rheum palmatum L. (Polygonaceae) against 17 different strains of the bacterium. New antimicrobial activity was found using the paper disc diffusion method, agar dilution as well as checkerboard method. Against the 17 strains, the disc diffusion test was in the range of 18-30?mm, and the minimum inhibitory concentrations (MICs) of EM were in the range of 1.5-25 ?g/mL. From those results we performed the checkerboard test to determine the synergism of EM in combination with ampicillin (AM) or oxacillin (OX) against all strains. The combined activity of EM and two antimicrobial agents (AM, OX) against all strains resulted in a fractional inhibitory concentrations index (FICI) ranging from 0.37-0.5 and from 0.37-0.75, respectively. The effect of EM with AM and OX was found to be synergistic or partially synergistic. We found that EM reduced the MICs of AM and OX. EM and in combination with AM or OX could lead to the development of new combination antibiotics against MRSA infection.
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Sauchinone protects pancreatic ? cells against cytokine-mediated toxicity.
Toxicol In Vitro
PUBLISHED: 08-17-2010
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Sauchinone has been shown to exert potent hepatoprotective, anti-inflammatory and inhibitory effects on bone resorption. In this study, we investigated the effect of sauchinone on IL-1? (5 ng/ml) and IFN-? (100 U/ml)-induced ?-cell damage. Pre-treatment with sauchinone increased the viability of cytokine-treated RINm5F cells at concentrations of 20-40 ?M. Sauchinone prevented nitric oxide (NO) production, and this effect was correlated with reduced levels of protein expression of the inducible form of NO synthase (iNOS). The molecular mechanism by which sauchinone inhibits iNOS gene expression appeared to involve the inhibition of NF-?B activation. Moreover, pancreatic ?-cells treated with cytokines upregulated the phosphorylation of STAT-1, STAT-3 and STAT-5, however, pre-treatment with sauchinone attenuated these effects. Additionally, in a second set of experiments in which rat islets were used, the protective effects of sauchinone in rat islets were essentially the same as those observed when RINm5F cells were used. Sauchinone prevented cytokine-induced NO production, iNOS expression, JAK/STAT activation, and NF-?B activation and inhibition of glucose-stimulated insulin secretion (GSIS). Collectively, these results suggest that sauchinone can be used for the prevention of functional ?-cell damage.
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Sulfuretin attenuates allergic airway inflammation in mice.
Biochem. Biophys. Res. Commun.
PUBLISHED: 07-31-2010
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Sulfuretin is one of the main flavonoids produced by Rhus verniciflua, which is reported to inhibit the inflammatory response by suppressing the NF-?B pathway. Because NF-?B activation plays a pivotal role in the pathogenesis of allergic airway inflammation, we here examined the effect of sulfuretin on an ovalbumin-induced airway inflammation model in mice. We isolated sulfuretin from R. verniciflua. Sulfuretin was delivered intraperitoneally after the last ovalbumin challenge. Airway hyper-responsiveness, cytokines, mucin, and eosinophilic infiltration were analyzed in bronchoalveolar lavage fluid and lung tissue. A single administration of sulfuretin reduced airway inflammatory cell recruitment and peribronchiolar inflammation and suppressed the production of various cytokines in bronchoalveolar fluid. In addition, sulfuretin suppressed mucin production and prevented the development of airway hyper-responsiveness. The protective effect of sulfuretin was mediated by the inhibition of the NF-?B signaling pathway. Our results suggest that sulfuretin may have therapeutic potential for the treatment of allergic airway inflammation.
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Sulfuretin protects against cytokine-induced beta-cell damage and prevents streptozotocin-induced diabetes.
Exp. Mol. Med.
PUBLISHED: 07-28-2010
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NF-kappaB activation has been implicated as a key signaling mechanism for pancreatic beta-cell damage. Sulfuretin is one of the main flavonoids produced by Rhus verniciflua, which is reported to inhibit the inflammatory response by suppressing the NF-kappaB pathway. Therefore, we isolated sulfuretin from Rhus verniciflua and evaluated if sulfuretin could inhibit cytokine- or streptozotocin-induced beta-cell damage. Rat insulinoma RINm5F cells and isolated rat islets were treated with IL-1 beta and IFN-gamma to induce cytotoxicity. Incubation of cells and islets with sulfuretin resulted in a significant reduction of cytokine-induced NF-gamma B activation and its downstream events, iNOS expression, and nitric oxide production. The cytotoxic effects of cytokines were completely abolished when cells or islets were pretreated with sulfuretin. The protective effect of sulfuretin was further demonstrated by normal insulin secretion of cytokine-treated islets in response to glucose. Treatment of mice with streptozotocin resulted in hyperglycemia and hypoinsulinemia, which was further evidenced by immunohistochemical staining of islets. However, the diabetogenic effects of streptozotocin were completely prevented when mice were pretreated with sulfuretin. The anti-diabetogenic effects of sulfuretin were also mediated by suppression of NF-kappaB activation. Collectively, these results indicate that sulfuretin may have therapeutic value in preventing beta-cell damage.
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Cytoprotective and anti-inflammatory effects of spinasterol via the induction of heme oxygenase-1 in murine hippocampal and microglial cell lines.
Int. Immunopharmacol.
PUBLISHED: 06-01-2010
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Spinasterol, which is isolated from the aerial parts of Aster scaber Thunb. (Asteraceae), is involved in various biological activities. In this study, we report the efficacy of spinasterol in effectively modulating the regulation of antioxidative and anti-inflammatory activity through the upregulation of heme oxygenase (HO)-1 in murine hippocampal HT22 cells and BV2 microglia. We showed that spinasterol increased the cellular resistance of HT22 cells to oxidative injury caused by the glutamate-induced cytotoxicity by extracellular signal-regulated kinase (ERK) pathway-dependent expression of HO-1. Furthermore, spinasterol suppressed the lipopolysaccharide (LPS)-induced expression of pro-inflammatory enzymes and inflammatory mediators in BV2 microglia. Spinasterol also suppressed the production of nitric oxide (NO), prostaglandin E2 (PGE?), tumor necrosis factor-? (TNF-?), and interleukin-1? (IL-1?) through extracellular signal-regulated kinase (ERK) pathway-dependent expression of HO-1. These results suggest that spinasterol has a therapeutic potential against neurodegenerative diseases that are caused by oxidative stress and neuroinflammation.
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Anti-inflammatory effects of sulfuretin from Rhus verniciflua Stokes via the induction of heme oxygenase-1 expression in murine macrophages.
Int. Immunopharmacol.
PUBLISHED: 04-01-2010
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Rhus verniciflua Stokes (Anacardiaceae) has traditionally been used as an ingredient in East Asian medicines used to treat oxidative damage and cancer. Sulfuretin is one of the major flavonoid components isolated from R. verniciflua. In the present study, we isolated sulfuretin from R. verniciflua and demonstrated that sulfuretin inhibited inducible nitric oxide synthase (iNOS) protein and mRNA expression, reduced iNOS-derived NO, suppressed COX-2 protein and mRNA expression, and reduced COX-derived PGE(2) production in lipopolysaccharide (LPS)-stimulated RAW264.7 and murine peritoneal macrophages. Similarly, sulfuretin reduced tumor necrosis factor-alpha (TNF-alpha) and interleukin-1 beta (IL-1 beta) production. In addition, sulfuretin suppressed the phosphorylation and degradation of I kappaB-alpha as well as the nuclear translocation of p65 by the stimulation of LPS in RAW264.7 macrophages. Furthermore sulfuretin induced heme oxygenase (HO)-1 expression through nuclear translocation of nuclear factor E2-related factor 2 (Nrf)2 and increased heme oxygenase (HO) activity in RAW264.7 macrophages. The effects of sulfuretin on LPS-induced NO, PGE(2), TNF-alpha, and IL-1 beta production were partially reversed by the HO-1 inhibitor, tin protoporphyrin (SnPP). Therefore, it is suggested that sulfuretin-induced HO-1 expression plays a role of the resulting anti-inflammatory effects in macrophages. This indicated that the anti-inflammatory effects of sulfuretin in macrophages might be exerted through a novel mechanism that involves HO-1 expression.
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Tribuli fructus constituents protect against tacrine-induced cytotoxicity in HepG2 cells.
Arch. Pharm. Res.
PUBLISHED: 02-27-2010
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A new phenolic amide, tribulusimide D (4-hydroxy-N-[3-(4-hydroxy-3-methoxyphenyl)-1-oxo-2-propen-1-yl]-3-methoxybenzamide) (1), together with a known phenolic amide, terrestriamide ((E)-3-(4-hydroxy-3-methoxyphenyl)-N-[2-(4-hydroxyphenyl)-2-oxoethyl]-prop-2-enamide) (2) and a flavonol glycoside, quercetin-3-O-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside (3) were isolated from the H2O extract of Tribuli Fructus. Compounds 1 and 3 showed significant hepatoprotective activities, with EC50 values of 13.46 +/- 0.2 and 7.06 +/- 0.7 microM, respectively, against tacrine-induced cytotoxicity in HepG2 cells.
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Early cerebellar granule cell migration in the mouse embryonic development.
Anat Cell Biol
PUBLISHED: 01-26-2010
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Pax6, a paired homeobox DNA binding protein, has been found to be expressed in the cerebellum in both granule cells and their precursors in the external granular layer (EGL). In this study we have traced Pax6 expression through embryonic development in mice by using a polyclonal antibody against Pax6 and used it to study the cellular dispersal pattern of the EGL. During dispersal the EGL was thicker and Pax6 expression was more intense on the rostral side of the lateral corners of the cerebellum. Pax6 immunoreactive cells were found to be migrating from the EGL during the early stage of EGL dispersal, which suggested the early inward migration of granule cells. Double staining with various markers confirmed that the early-migrating cells are not Purkinje cells, interneurons or glia. Although the Pax6 immunoreactive cells within the cerebellum were not apparently proliferating, NeuN, a marker for postmitotic granule cells, was not expressed in these cells until E16. Furthermore, granule cells were observed migrating inwards from the EGL both during and after EGL dispersal. These early migrating granule cells populated the whole cerebellum. These findings offer novel views on specific stages of granule cell dispersal and migration.
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TBR2-immunopsitive unipolar brush cells are associated with ectopic zebrin II-immunoreactive Purkinje cell clusters in the cerebellum of scrambler mice.
Anat Cell Biol
PUBLISHED: 01-26-2010
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Unipolar brush cells (UBCs) are excitatory interneurons with their somata located in the granular layer. Recently, T-brain factor 2 (Tbr2) was shown to be expressed in a subset of UBCs in mouse cerebellum. Scrambler mice exhibit severe cerebellum abnormalities, including the failure of embryonic Purkinje cell dispersal and a complete absence of foliation due to a mutation in the disabled-1 adaptor protein. Since most UBC markers are expressed postnatally, it has proven difficult to identify the relationship between developing Purkinje cell clusters and migrating UBCs. Because scrambler mice closely mimic normal embryonic day 18 cerebellum, we examined whether Tbr2-positive UBCs are associated with Purkinje cell cluster markers such as zebrin II, which is the most studied compartmentation marker in the cerebellum. We investigated the distribution of Tbr2-positive UBCs in this mutant by using anti-Tbr2 immunocytochemistry. The data revealed that Tbr2 immunoreactivity was exclusively present in the nucleus of UBCs in scrambler cerebellum. Based on expression data, a Tbr2-positive UBC map was constructed. In addition, Tbr2-positive UBCs are found associated with ectopic zebrin II-immunoreactive Purkinje cell clusters in scrambler cerebellum. These data suggest that UBCs use Purkinje cell compartmentation to migrate into their final position through interactions with the embryonic array of specific Purkinje cell subtypes.
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Neuroprotective effects of constituents of the root bark of Dictamnus dasycarpus in mouse hippocampal cells.
Arch. Pharm. Res.
PUBLISHED: 01-13-2010
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Glutamate-induced oxidative injury causes neuronal degeneration related to many central nervous system diseases, such as Parkinsons disease, Alzheimers disease, epilepsy and ischemia. The bioassay-guided fractionation of the EtOH extract of the root bark of Dictamnus dasycarpus Trucz. provided one neuroprotective limonoid, obacunone, together with a degraded limonoid, fraxinellone and two alkaloids, dictamine and haplopine. At concentrations of 100-150 microM, obacunone showed the potent neuroprotective effects on glutamateinduced neurotoxicity and induced the expression of heme oxygenase (HO)-1 in the mouse hippocampal HT22 cells. In addition, we found that obacunone increased p38 MAPK phosphorylation and induced HO-1 expression via p38 MAPK pathway. These results suggest that obacunone isolated from the root bark of D. dasycarpus increases cellular resistance to glutamate-induced oxidative injury in mouse hippocampal HT22 cells, presumably through the p38 MAPK pathway-dependent HO-1 expression. These results suggest that obacunone could be the effective candidates for the treatment of ROS-related neurological diseases.
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Radiofrequency treatment relieves chronic knee osteoarthritis pain: a double-blind randomized controlled trial.
Pain
PUBLISHED: 01-07-2010
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Chronic osteoarthritis (OA) pain of the knee is often not effectively managed with current non-pharmacological or pharmacological treatments. Radiofrequency (RF) neurotomy is a therapeutic alternative for chronic pain. We investigated whether RF neurotomy applied to articular nerve branches (genicular nerves) was effective in relieving chronic OA knee joint pain. The study involved 38 elderly patients with (a) severe knee OA pain lasting more than 3 months, (b) positive response to a diagnostic genicular nerve block and (c) no response to conservative treatments. Patients were randomly assigned to receive percutaneous RF genicular neurotomy under fluoroscopic guidance (RF group; n=19) or the same procedure without effective neurotomy (control group; n=19). Visual analogue scale (VAS), Oxford knee scores, and global perceived effect on a 7-point scale were measured at baseline and at 1, 4, and 12weeks post-procedure. VAS scores showed that the RF group had less knee joint pain at 4 (p<0.001) and 12 (p<0.001) weeks compared with the control group. Oxford knee scores showed similar findings (p<0.001). In the RF group, 10/17 (59%), 11/17 (65%) and 10/17 (59%) achieved at least 50% knee pain relief at 1, 4, and 12 weeks, respectively. No patient reported a post-procedure adverse event during the follow-up period. RF neurotomy of genicular nerves leads to significant pain reduction and functional improvement in a subset of elderly chronic knee OA pain, and thus may be an effective treatment in such cases. Further trials with larger sample size and longer follow-up are warranted.
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Effects of sappanchalcone on the cytoprotection and anti-inflammation via heme oxygenase-1 in human pulp and periodontal ligament cells.
Eur. J. Pharmacol.
PUBLISHED: 01-05-2010
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Sappanchalcone has been demonstrated to possess several biological effects. However, the molecular mechanism underlying these effects is not fully understood. In this study, we examined the effects of sappanchalcone on hydrogen peroxide (H(2)O(2))-induced cytotoxicity using human dental pulp (HDP) cells, and lipopolysaccharide (LPS)-induced inflammation using human periodontal ligament (HPDL) cells. Sappanchalone concentration proportionately increased heme oxygenase (HO)-1 protein expression and enzyme activity in both HDP and HPDL cells. It also protected HDP cells from H(2)O(2)-induced cytotoxicity and reactive oxygen species production. The cytoprotective effect of sappanchalcone was nullified by HO-1 inhibitor, Tin protoporphyrin (SnPP). Sappanchalcone is seen to inhibit LPS-stimulated nitric oxide (NO), prostaglandin E(2) (PGE(2)), interlukine-1beta (IL-1beta), tumor necrosis factor-alpha (TNF-alpha), interlukine-6 (IL-6) and interlukine-12 (IL-12) release in addition to inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) expression in HPDL cells. SnPP, a specific inhibitor of HO-1, partly blocked sappanchalcone mediated suppression of inflammatory mediator production, in LPS-stimulated HPDL cells. HDP and HPDL cells treated with sappanchalcone exhibited the transient activation of c-Jun NH2-terminal kinase (JNK) and NF-E2-related factor-2 (Nrf2). The expression of HO-1 protein by sappanchalcone was significantly reduced by pretreatment with JNK inhibitor. In conclusion, induction of HO-1 is an important cytoprotective mechanism by which sappanchalcone protects HDP cells from H(2)O(2) and in addition it also exhibits anti-inflammatory effects in LPS-stimulated HPDL cells. Thus, sappanchalcone could potentially be a therapeutic approach for periodontal, pulpal and periapical inflammatory lesion.
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Isoliquiritigenin 2-methyl ether induces growth inhibition and apoptosis in oral cancer cells via heme oxygenase-1.
Toxicol In Vitro
PUBLISHED: 10-09-2009
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We previously reported that a chloroform extract of Caesalpinia sappan L. induces apoptosis in oral cancer cells but not in normal epithelial cell lines. In the present study, we explored the effects of a single compound isolated from C. sappan heartwood, isoliquiritigenin 2-methyl ether (ILME), on cultured primary and metastatic oral cancer cell lines using MTT assays, fluorescence microscopy, flow cytometry, and Western blotting. ILME inhibited the growth of the oral cancer cells in a time- and dose-dependent manner. The major mechanism of growth inhibition was apoptosis induction, as shown by flow cytometric analysis of sub-G(1)-phase arrest and by annexin V-FITC and propidium iodide staining. ILME time-dependently activated NF-kappaB transcription factors, phospholated the MAP kinases JNK (c-Jun N-terminal kinase) and ERK (extracellular signal-regulated kinase). Furthermore, ILME treatment upregulated HO-1 expression though activation of Nrf2 (NF-E2-related factor 2) pathway, and induced the expression of heme oxygenase-1 (HO-1). Tin protoporphyrin, an HO-1 inhibitor, dose-dependently attenuated the growth-inhibitory effect of ILME and blocked ILME-induced expression of the p21 and p53 cell cycle-regulatory proteins. These results provide the first evidence that the anti-oral cancer effects of ILME may involve a mechanism in which HO-1 is upregulated via a pathway involving MAP kinases, NF-kappaB, and Nrf2. Thus, ILME could be considered to be a potential chemotherapeutic target for anti-oral cancer treatment strategies.
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Effects of bilateral stellate ganglion block on autonomic cardiovascular regulation.
Circ. J.
PUBLISHED: 08-27-2009
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Stellate ganglion block (SGB) is performed for the diagnosis and treatment of sympathetic dependent pain in the head, neck and upper limbs. However, the effects of bilateral SGB on cardiovascular and autonomic regulation remain unknown. The aim of this study was to assess the effects of bilateral SGB on cardiovascular and autonomic function by measuring heart rate variability (HRV), systolic blood pressure variability (SBPV) and spontaneous baroreflex sensitivity (SBRS).
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Chromone glycosides and hepatoprotective constituents of Hypericum erectum.
Arch. Pharm. Res.
PUBLISHED: 08-20-2009
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Two chromone glycosides, hyperimone A [7-(beta-D-glucopyranosyloxy)-5-hydroxy-2-(1-methylethyl)-4H-1-benzopyran-4-one (1)] and hyperimone B [7-(beta-D-glucopyranosyloxy)-5-hydroxy-3-methyl-4H-1-benzopyran-4-one (2)], together with six known compounds were isolated from the methanolic extract of the whole plant of Hypericum erectum. 1,3,5,6-Tetrahydroxyxanthone (5) and I3, II8-biapigenin (6) showed moderate hepatoprotective activity with EC(50) values of 160.2 +/- 0.6 microM and 217.7 +/- 1.3 microM, respectively, against tacrine-induced cytotoxicity in HepG2 cells.
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Histochemical study of intestinal mucins after administration of silver nanoparticles in Sprague-Dawley rats.
Arch. Toxicol.
PUBLISHED: 08-12-2009
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To investigate the effects of silver nanoparticles on the histological structure and properties of the mucosubstances in the intestinal mucosa, Sprague-Dawley rats were divided into four groups (10 rats in each group): vehicle control, low-dose group (30 mg/kg), middle-dose group (300 mg/kg), and high-dose group (1,000 mg/kg), and administered silver nanoparticles (60 nm) for 28 days, following OECD test guideline 407 and using GLP. The control sections contained no silver nanoparticles; however, the treated samples showed luminal and surface particles and the tissue also contained silver nanoparticles. A dose-dependent increased accumulation of silver nanoparticles was observed in the lamina propria in both the small and large intestine, and also in the tip of the upper villi in the ileum and protruding surface of the fold in the colon. The silver nanoparticle-treated rats exhibited higher numbers of goblet cells that had released their mucus granules than the controls, resulting in more mucus materials in the crypt lumen and ileal lumen. Moreover, cell shedding at the tip of the villi was frequent. Lower amounts of neutral and acidic mucins were found in the goblet cells in the silver nanoparticle-treated rats, plus the amount of sialomucins was increased, while the amount of sulfomucins was decreased. In particular, in the colon of the silver nanoparticle-treated rats, sialyated mucins were detected in the lamina propria, the connective tissue under the epithelia. Therefore, the present results suggest that silver nanoparticles induce the discharge of mucus granules and an abnormal mucus composition in the goblet cells in the intestines.
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Nitric oxide modulates osteoblastic differentiation with heme oxygenase-1 via the mitogen activated protein kinase and nuclear factor-kappaB pathways in human periodontal ligament cells.
Biol. Pharm. Bull.
PUBLISHED: 08-05-2009
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Nitric oxide (NO) and heme oxygenase-1 (HO-1) play important roles in the regulation of stem cell proliferation and differentiation. However, it has not been examined whether human periodontal ligament (PDL) cells can differentiate into osteoblast-like cells by NO activity mediated via HO-1. The objective of this study was to determine the effect of NO on proliferation and differentiation in human PDL cells, and to identify the underlying mechanism of its actions. Primary human PDL cells were cultured with NO donor sodium nitroprusside (SNP); cell proliferation and differentiation were measured. NO production, cell viability and cell proliferation were evaluated using the Griess reagent, MTT assay and BrdU incorporation, respectively. To analyze differentiation, we measured alkaline phosphatase (ALP) activity, osteocalcin (OC), osteonectin (ON) expression, and bone sialoprotein (BSP) by Western blotting. SNP-induced NO production is associated with inducible nitric oxide synthase induction in a time and dose-dependent manner. SNP resulted in decreased cell proliferation and increased expression of osteogenic differentiation markers such as ALP, OC, ON and BSP. Maximal HO-1 was reached with 0.05 mM SNP and gradually decreased with 1.0 mM. Treatment with an HO-1 inhibitor and selective inhibitors of extracellular regulated kinase 1/2 and nuclear factor-kappaB blocked the SNP-induced growth inhibition, as well as osteoblastic differentiation. These data suggest that NO-induced osteogenic differentiation through HO-1 may be an important mediator of periodontal regeneration or bone tissue engineering.
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Anti-inflammatory effects of apigenin on nicotine- and lipopolysaccharide-stimulated human periodontal ligament cells via heme oxygenase-1.
Int. Immunopharmacol.
PUBLISHED: 07-10-2009
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Although apigenin exhibits various biological effects, its anti-inflammatory role in the periodontal field remains unknown. We examined the anti-inflammatory effects of apigenin and the underlying mechanism in nicotine- and lipopolysaccharide (LPS)-stimulated human periodontal ligament (hPDL) cells.
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Protective effect of sauchinone by upregulating heme oxygenase-1 via the P38 MAPK and Nrf2/ARE pathways in HepG2 cells.
Planta Med.
PUBLISHED: 07-09-2009
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Sauchinone, a unique lignan isolated from the roots of Saururus chinensis (Lour.) Baill. (Saururaceae), is reported to exert potent hepatoprotective, anti-inflammatory actions and inhibitory effects on bone resorption. This study investigated the potency of sauchinone as a hepatic heme oxygenase (HO)-1 inducer and its protective effects in HepG2 cells. Treatment of the cells with sauchinone induced HO-1 expression and increased HO activity in a concentration- and time-dependent manner. This expression conferred cytoprotection against oxidative injury induced by T-butyl hydroperoxide. HO-1 expression by sauchinone also suppressed T-butyl hydroperoxide-induced reactive oxygen species generation in HepG2 cells. Moreover, sauchinone promoted the nuclear accumulation of the nuclear factor, E2-related factor 2 (Nrf2), and increased the promoter property of the antioxidant response element (ARE). Furthermore, treatment of the cells with a p38 MAPK inhibitor (SB203580) reduced sauchine-induced HO-1 expression and its protective effects. These results suggest that sauchinone increases the cellular resistance of HepG2 cells to T-butyl hydroperoxide-induced oxidative injury, presumably through the p38 MAPK pathway-Nrf2/ARE-dependent HO-1 expression.
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Cytoprotective constituents of the heartwood of Caesalpinia sappan on glutamate-induced oxidative damage in HT22 cells.
Biol. Pharm. Bull.
PUBLISHED: 05-08-2009
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The bioassay-guided fractionation of a MeOH extract of the heartwood of Caesalpinia sappan L. provided two neuroprotective compounds, sappanchalcone (2) and 4-O-methylepisappanol (3), together with a methoxychalcone, isoliquiritigenin 2-methyl ether (1), and three aromatic compounds, 4-O-methylsappanol (4), caesalpine J (5), pluchoic acid (6). At concentrations of 20-40 microM, compound 2 showed significant cytoprotective effects against glutamate-induced oxidative stress through the induction of heme oxygenase (HO)-1 in HT22-immortalized hippocampal cells. Compound 3 also showed moderate neuroprotective effect at 40 microM, but compounds 1, 4-6 did not show any protective effects against glutamate-induced cytotoxicity in HT22 cells.
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Cudratricusxanthone A from Cudrania tricuspidata suppresses pro-inflammatory mediators through expression of anti-inflammatory heme oxygenase-1 in RAW264.7 macrophages.
Int. Immunopharmacol.
PUBLISHED: 05-01-2009
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Cudratricusxanthone A (CTXA), isolated from the roots of Cudrania tricuspidata Bureau (Moraceae) has an isoprenylated xanthone skeleton that is known to exert a variety of biological activities. In the present study, we demonstrated that CTXA inhibited cyclooxygenase-2 (COX-2) and inducible nitric oxide (NO) synthase (iNOS) expression, and thereby reduced COX-2-derived prostaglandin E2 (PGE(2)) and iNOS-derived NO production in lipopolysaccharide (LPS)-stimulated macrophages. Similarly, CTXA suppressed tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta) production. Moreover, CTXA inhibited the induced phosphorylation and degradation of IkappaB-alpha as well as the LPS-induced increase in p65 in the nuclear fraction of macrophages. CTXA also induced heme oxygenase-1 (HO-1) expression and increased heme oxygenase (HO) activity in RAW264.7 macrophages. We also demonstrated that the effects of CTXA on LPS-induced PGE(2), NO, TNF-alpha, and IL-1beta production were partially reversed by the HO-1 inhibitor tin protoporphyrin, suggesting that CTXA-induced HO-1 expression was partly responsible for the resulting anti-inflammatory effects of the drug. Thus CTXA was shown to be an effective HO-1 inducer, capable of inhibiting macrophage-derived pro-inflammatory mediators.
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Cytoprotective effects of lindenenyl acetate isolated from Lindera strychnifolia on mouse hippocampal HT22 cells.
Eur. J. Pharmacol.
PUBLISHED: 04-24-2009
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Oxidative injury contributes to neuronal degeneration in many central nervous system (CNS) diseases, such as Parkinsons disease, Alzheimers disease, epilepsy and ischemia. Inducible heme oxygenase (HO)-1 acts against oxidants that are thought to play a role in the pathogenesis of these diseases. Lindenenyl acetate, isolated by bioassay-guided fractionation of the MeOH extract of the roots of Lindera strychnifolia, showed potent neuroprotective effects on glutamate-induced neurotoxicity by inducing the expression of HO-1 and increasing the activity of HO in mouse hippocampal HT22 cells. Furthermore, lindenenyl acetate caused the nuclear accumulation of nuclear factor-E2-related factor 2 (Nrf2) and increased the promoter activity of antioxidant response elements (ARE) in mouse hippocampal HT22 cells. In addition, we found that treatment of the cells with extracellular signal-regulated kinase (ERK) inhibitor (U0126) reduced lindenenyl acetate-induced HO-1 expression. Lindenenyl acetate also increased ERK phosphorylation. These results suggest that lindenenyl acetate increases cellular resistance to glutamate-induced oxidative injury in mouse hippocampal HT22 cells, presumably through the ERK pathway-Nrf2/ARE-dependent HO-1 expression.
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Magnolia officinalis reverses alcoholic fatty liver by inhibiting the maturation of sterol regulatory element-binding protein-1c.
J. Pharmacol. Sci.
PUBLISHED: 04-18-2009
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The generally accepted hypothesis for the pathogenesis of alcoholic liver disease (ALD) is the two-hit model, which proposes that fat accumulation in the liver increases the sensitivity of the liver to a second hit that leads to inflammatory liver cell damage. In this study we evaluated the effects of Magnolia officinalis (MO), which contains honokiol and magnolol as the primary pharmacological components, to eradicate fatty liver in rats fed an ethanol diet. In vitro studies showed that MO was able to protect RAW 264.7 cells from ethanol-induced production of tumor necrosis factor-alpha, reactive oxygen species, and superoxide anion radicals; the activation of NADPH oxidase; and subsequent cell death. We also investigated the therapeutic effects of MO on alcoholic fatty liver in Lieber-DeCarli ethanol diet-fed rats. MO treatment of the rats for the last 2 weeks of ethanol feeding completely reversed all the serum, hepatic parameters, and fatty liver changes. The increased maturation of sterol regulatory element-binding protein-1c in the liver by ethanol treatment was completely inhibited by treatment with MO. Therefore, MO may be a promising candidate for development as a therapeutic agent for ALD.
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Striking pattern of Purkinje cell loss in cerebellum of an ataxic mutant mouse, tottering.
Acta Neurobiol Exp (Wars)
PUBLISHED: 03-28-2009
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Tottering mouse is an ataxic mutant that carries a mutation in a gene encoding for the apha1A subunit of P/Q-type Ca2+ channel (Cav2.1). This study revisited to examine whether a Purkinje cell loss occurred in the cerebellum of tottering mice. In tottering mice, Calbindin D-28k negative gaps were apparent in the vermis but not in the hemisphere. Calbindin D-28k immunofluorescence with DAPI staining demonstrated the absence of Purkinje cells in the Calbindin D-28k negative gaps. The Purkinje cell loss seemed to be observed prominently in the zebrin II negative compartments of the anterior vermis, but in the zebrin II positive compartments of the posterior vermis. Quite consistent with the histopathological observations, quantitation of the density of Calbindin D-28k and zebrin II immunopositive Purkinje cells in the tottering cerebellum revealed that the Purkinje cells were selectively lost in the zebrin II immunonegative compartments of the lobules I and II but in the zebrin II immunopositive compartments in the lobule IX. Those results predict that the susceptibility to the Cav2.1 gene defect is different among Purkinje cell phenotypes of the tottering cerebellum rather than the expression pattern of mutated Cav2.1 channels. This may result in the reproducible parasagittal pattern of Purkinje cell loss.
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Indole-3-propionic acid attenuates neuronal damage and oxidative stress in the ischemic hippocampus.
J. Neurosci. Res.
PUBLISHED: 02-25-2009
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Tryptophan-derived indole compounds have been widely investigated as antioxidants and as free-radical scavengers. Indole-3-propionic acid (IPA), one of these compounds, is a deamination product of tryptophan. In the present study, we used Mongolian gerbils to investigate IPAs neuroprotective effects against ischemic damage and its antioxidative effects in the hippocampal CA1 region (CA1) after 5 min of transient forebrain ischemia. The repeated oral administration of IPA (10 mg/kg) for 15 days before ischemic surgery protected neurons from ischemic damage. In this group, the percentage of cresyl violet-positive neurons in the CA1 was 56.8% compared with that in the sham group. In the vehicle-treated group, glial fibrillary acidic protein (GFAP)-, S-100-, and vimentin-immunoreactive astrocytes and ionized calcium-binding adapter molecule 1 (Iba-1)- and isolectin B4 (IB4)-immunoreactive microglia were activated 4 days after ischemia/reperfusion, whereas in the IPA-treated ischemic group, GFAP, S-100, Iba-1, and IB4, but not vimentin, immunoreactivity was distinctly lower than that in the vehicle-treated ischemic groups. The administration of IPA significantly decreased the level of 4-hydroxy-2-nonenal, a marker of lipid peroxidation, in ischemic hippocampal homogenates compared with that in the vehicle-treated ischemic groups at various times after ischemia/reperfusion. In addition, immunostaining for 8-hydroxy-2-deoxyguanosine showed DNA damage in pyramidal neurons in the ischemic CA1 was significantly lower in the IPA-treated ischemic groups than in the vehicle-treated ischemic groups. These results suggest that IPA protects neurons from ischemia-induced neuronal damage by reducing DNA damage and lipid peroxidation.
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Calbindin d-28k immunoreactivity and its protein level in hippocampal subregions during normal aging in gerbils.
Cell. Mol. Neurobiol.
PUBLISHED: 02-03-2009
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The hippocampus is associated with learning and memory function and shows neurochemical changes in aging processes. Calbindin D-28k (CB) binds calcium ion with a fast association rate. We examined age-related changes in CB immunoreactivity and its protein level in the gerbil hippocampus during normal aging. In the hippocampal CA1 region (CA1) and CA2, CB immunoreaction was found in some neurons in the stratum pyramidale (SP) at postnatal month 1 (PM 1). CB immunoreactivity in neurons was markedly increased at PM 3. Thereafter, CB immunoreactivity was decreased with time: CB-immunoreactive ((+)) neurons were fewest at PM 24. In the CA3, a few CB(+) neurons were found only in the SP at PM 1 and in the stratum radiatum at PM 18 and 24. In addition, mossy fibers were stained with CB at PM 1. CB immunoreactivity in mossy fibers was markedly increased at PM 3, thereafter it was decreased with time. In the dentate gyrus, many granule cells (GC) in the granule cell layer were stained with CB at PM 1. CB immunoreactivity in GC was markedly increased at PM 3, thereafter CB immunoreactivity was decreased with time. In Western blot analysis, CB protein level in the gerbil hippocampus was highest at PM 3, thereafter CB protein levels were decreased with time. This result indicates that CB in the gerbil hippocampus is abundant at PM 3 and is decreased with age.
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Pogo: a novel spontaneous ataxic mutant mouse.
Cerebellum
PUBLISHED: 01-30-2009
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The Pogo (pogo/pogo) mouse is a naturally occurring neurological mutant from a Korean wild-type mouse characterized by loss of balance and motor coordination due to dysfunction of the cerebellum. The Pogo mutation is believed to be an allele of P/Q-type calcium channel mutants such as tottering, leaner, and rolling mouse Nagoya. These mutants have been served as mouse models for a group of neurodegenerative diseases. The overall aim of this minireview is to summarize our current understanding of the ataxic Pogo mouse. To address this issue, we first describe the discovery of Pogo mouse and its morphological and behavioral defects. Then, we focus on the abnormal expression of several molecules in the Pogo cerebellum, including tyrosine hydroxylase, glutamate, corticotrophin-releasing factor, and 5-hydroxytryptamine. Much of this review is concerned with the functional implications of these ectopic molecules in the Pogo cerebellum.
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Predictors of difficult intubation defined by the intubation difficulty scale (IDS): predictive value of 7 airway assessment factors.
Korean J Anesthesiol
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The intubation difficulty scale (IDS) has been used as a validated difficulty score to define difficult intubation (DI). The purpose of this study is to identify airway assessment factors and total airway score (TAS) for predicting DI defined by the IDS.
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Protective efficacy of an Ecklonia cava extract used to treat transient focal ischemia of the rat brain.
Anat Cell Biol
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Phlorotannins (marine algal polyphenols) have been reported to exhibit beneficial biological activities, serving as both antioxidants and anti-inflammatory agents. Among marine algae, Ecklonia cava, a member of the Laminariaceae, is a very popular food regarded as healthy in Korea and Japan. Recently, benefits afforded by phlorotannins in the treatment of various clinical conditions have been reported, but any therapeutic effects of such materials in the treatment of neurodegenerative diseases such as stroke remain unclear. Also, the mechanisms of action of the algal components remain poorly understood. In the present in vivo study, administration of Ecklonia cava polyphenols (ECP) at 10 mg/kg and 50 mg/kg intraperitoneally (i.p.) significantly decreased infarct size and the extent of brain edema in the rat after induction of transient focal ischemia via middle cerebral artery occlusion (MCAO). Further, terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay revealed dose-dependent blockage of neuronal apoptosis upon intravenous ECP treatment. Neurobehavioral tests performed over the 6 days after MCAO revealed a reduction in neurological motor performance in control animals, but administration of ECP (50 mg/kg i.p.) prevented this decline. In vitro, a significant neuroprotective effect of ECP was evident when cell viability was assayed after induction of H(2)O(2)-mediated oxidative stress, upon retinoic acid treatment, in the differentiated neuroblastoma cell line SH-SY5Y. Interestingly, ECP blocked the rise in cytosolic calcium, in a dose-dependent manner, in differentiated SH-SY5Y cells exposed to H(2)O(2). Together, the results suggest that ECP exerts neuroprotective effects in the focally ischemic brain by reducing Ca(2+)-mediated neurotoxicity.
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The effects of lidocaine and procaine on microRNA expression of adipocyte-derived adult stem cells.
Korean J Anesthesiol
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The microRNA (miRNA) pathway has emerged as one of the biologic pathways implicated in stem cell regulation. miRNA is a noncoding, single-stranded RNA consisting of 20-25 nucleotides that inhibits the protein production at the step of translation. The molecular effects of lidocaine and procaine on adipose stem cells were investigated by examining RNA expression array.
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Betula platyphylla attenuated mast cell-mediated allergic inflammation in vivo and in vitro.
Life Sci.
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Betula platyphylla (B. platyphylla) has traditionally been used in Korea to treat inflammatory diseases. However, the exact mechanism that accounts for the anti-inflammatory effect of B. platyphylla is not completely understood. The aim of the present study is to elucidate whether and how B. platyphylla modulates the mast cell-mediated allergy inflammation in vitro and in vivo.
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