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Find video protocols related to scientific articles indexed in Pubmed.
Clinical analysis of cause, treatment and prognosis in acute kidney injury patients.
PLoS ONE
PUBLISHED: 01-01-2014
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Acute kidney injury (AKI) is characterized by an abrupt decline in renal function, resulting in an inability to secrete waste products and maintain electrolyte and water balance, and is associated with high risks of morbidity and mortality. This study retrospectively analyzed clinical data, treatment, and prognosis of 271 hospitalized patients (172 males and 99 females) diagnosed with AKI from December, 2008 to December, 2011. In addition, this study explored the association between the cause of AKI and prognosis, severity and treatment of AKI. The severity of AKI was classified according to the Acute Kidney Injury Network (AKIN) criteria. Renal recovery was defined as a decrease in a serum creatinine level to the normal value. Prerenal, renal, and postrenal causes accounted for 36.5% (99 patients), 46.5% (126 patients) and 17.0% (46 patients), respectively, of the incidence of AKI. Conservative, surgical, and renal replacement treatments were given to 180 (66.4%), 30 (11.1%) and 61 patients (22.5%), respectively. The overall recovery rate was 21.0%, and the mortality rate was 19.6%. Levels of Cl(-), Na(+) and carbon dioxide combining power decreased with increasing severity of AKI. Cause and treatment were significantly associated with AKI prognosis. Likewise, the severity of AKI was significantly associated with cause, treatment and prognosis. Multivariate logistic regression analysis found that respiratory injury and multiple organ dysfunction syndrome (MODS) were associated with AKI patient death. Cause, treatment and AKIN stage are associated with the prognosis of AKI. Respiratory injury and MODS are prognostic factors for death of AKI patients.
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Generation of insulin-producing cells from rat mesenchymal stem cells using an aminopyrrole derivative XW4.4.
Chem. Biol. Interact.
PUBLISHED: 10-28-2013
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Type 1 diabetes mellitus (T1DM), a multisystem disease with both biochemical and anatomical/structural consequences, is a major health concern worldwide. Pancreatic islet transplantation provides a promising treatment for T1DM. However, the limited availability of islet tissue or new sources of insulin producing cells (IPCs) that are responsive to glucose hinder this promising approach. Though slow, the development of pancreatic beta-cell lines from rodent or human origin has been steadily progressing. Bone marrow-derived mesenchymal stem cells (MSCs) are multipotent, culture-expanded, non-hematopoietic cells that are currently being investigated as a novel cellular therapy. The in vitro differentiation potential of IPCs has raised hopes for a treatment of clinical diseases associated with autoimmunity. We screened for small molecules that induce pancreatic differentiation of IPCs. There are some compounds which showed positive effects on the DTZ staining. The aminopyrrole derivative compound XW4.4 which shows the best activity among them was found to induce pancreatic differentiation of rat MSCs (rMSCs). The in vitro studies indicated that treatment of rMSCs with compound XW4.4 resulted in differentiated cells with characteristics of IPCs including islet-like clusters, spherical, grape-like morphology, insulin secretion, positive for dithizone, glucose stimulation and expression of pancreatic endocrine cell marker genes. The data has also suggested that hepatocyte nuclear factor 3? (HNF 3?) may be involved in pancreatic differentiation of rMSCs when treated with XW4.4. Results indicate that XW4.4 induced rMSCs support the efforts to derive functional IPCs and serve as a means to alleviate limitations surrounding islet cell transplantation in the treatment of T1DM.
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A higher frequency of CD4(+)CXCR5(+) T follicular helper cells in patients with newly diagnosed IgA nephropathy.
Immunol. Lett.
PUBLISHED: 08-21-2013
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The frequency of different subsets of CD4(+)CXCR5(+) TFH cells and the levels of serum cytokines were examined in 24 patients with newly diagnosed IgAN before and 8-12 weeks after treatment and in 12 healthy controls (HC). In comparison with HC, significantly higher percentages of CD4(+)CXCR5(+), CD4(+)CXCR5(+)ICOS(+), CD4(+)CXCR5(+)PD-1(+) TFH cells and higher levels of serum IL-17A, IFN-?, IL-2, IL-10, IL-4 and IL-21 were detected in IgAN patients. The percentages of CD4(+)CXCR5(+) TFH cells were negatively correlated with the values of eGFR and CD4(+)CXCR5(+)PD-1(+) TFH cells were correlated positively with the levels of serum IL-21 and Gd-IgA1 as well as 24h urinary proteins. Treatment with prednisone significantly reduced the frequency of CD4(+)CXCR5(+) and CD4(+)CXCR5(+)PD-1(+) TFH cells and the levels of serum IL-21, but increased IL-4 and IL-10 in those patients. A higher frequency of CD4(+)CXCR5(+) TFH cells existed in patients with IgAN and may be associated with the development of IgAN.
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Functionalized heterocyclic scaffolds derived from Morita-Baylis-Hillman Acetates.
Chem. Commun. (Camb.)
PUBLISHED: 07-24-2013
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Five series of heterocycles with extraordinary structural diversity have been regiospecifically synthesized from the same Morita-Baylis-Hillman Acetates (MBHAs). All four potential electrophilic sites (?, ?, ?, ?) of MBHAs are proved to be reactive.
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Synthesis and biological evaluation of 2-indolinone derivatives as potential antitumor agents.
Eur J Med Chem
PUBLISHED: 08-05-2011
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Three series of 3-substituted-indolin-2-ones and azaindolin-2-ones have been synthesized and showed potential antiproliferative activity to cancer cell lines. The inhibition activities on VEGF-induced VEGFR phosphorylation were observed for selected 2-indolinones. Among the compounds synthesized, 5-fluoroindolin-2-one derivative 23 with a pyridone unit showed the most significant enzymatic and cellular activities. Flow cytometric analysis indicates that 23 plays a role in suppressing HCT-116 cell proliferation via G1 phase arrest and apoptosis in a dose dependent manner. The binding mode of compound 23 complexed with VEGFR-2 was predicted using FlexX algorithm. Described here are the chemistry and biological testing for these series which will guide the design and optimization of novel 2-indolione antitumor agents.
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"One-pot" multicomponent approach to indolizines and pyrido[1,2-a]indoles.
Org. Lett.
PUBLISHED: 04-21-2011
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A new synthetic protocol for efficient and regiospecifc assembly of indolizines and pyrido[1,2-a]indoles by coupling of substituted methyl bromides and alkynes with corresponding pyrrole-2-carboxaldehyde and 1H-indole-2-carboxaldehyde has been developed. Additionally, a possible mechanism for the reaction is proposed.
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Domino approach for the synthesis of pyrrolo[1,2-alpha]pyrazine from vinyl azides.
Org. Lett.
PUBLISHED: 08-04-2010
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A domino synthesis of pyrrolo[1,2-alpha]pyrazine from 1H-2-pyrrolecarbaldehyde and readily synthesized vinyl azides was developed. This reaction proceeded under relatively mild conditions in the presence of base. Additionally, a possible mechanism for the entire sequence is proposed.
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Synthesis, biological evaluation, and structure-activity relationship study of novel cytotoxic aza-caffeic acid derivatives.
Bioorg. Med. Chem.
PUBLISHED: 05-04-2010
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Three series of aza-caffeic acid derivatives with different linkers were designed and synthesized. Each of the synthesized derivatives was then used in cytotoxicity screening on either 8 or 12 human cancer cell lines. The structure-activity relationships on three structural regions A, B, and C are analyzed in detail, indicating that a nine bond linker B, containing a piperazine unit, is the most favorable linker leading to the generation of molecules with potent cytotoxicities. Compound (E)-1-(4-(3,4-dichlorobenzyl)piperazin-1-yl)-3-(4-(4-ethoxybenzyloxy)-3,5-dimethoxyphenyl)prop-2-en-1-one (80) exhibited the most significant and selective cytotoxicity to KB, BEL7404, K562, and Eca109 cell lines, with IC(50) values of 0.2, 2.0, 1.7, and 1.1 microM, respectively, stronger than that seen for caffeic acid phenethyl ester (CAPE) and cisplatin (CDDP). Flow cytometric and western blot analysis indicate that compound 80 plays a role in mitochondria-dependent apoptosis activity by suppressing K562 cell proliferation in a concentration- and time-dependent manner.
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Improved expression of His(6)-tagged strictosidine synthase cDNA for chemo-enzymatic alkaloid diversification.
Chem. Biodivers.
PUBLISHED: 04-17-2010
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Strictosidine synthase (STR1) catalyzes the stereoselective formation of 3alpha(S)-strictosidine from tryptamine and secologanin. Strictosidine is the key intermediate in the biosynthesis of 2,000 plant monoterpenoid indole alkaloids, and it is a key precursor of enzyme-mediated synthesis of alkaloids. An improved expression system is described which leads to optimized His(6)-STR1 synthesis in Escherichia coli. Optimal production of STR1 was achieved by determining the impact of co-expression of chaperones pG-Tf2 and pG-LJE8. The amount and activity of STR1 was doubled in the presence of chaperone pG-Tf2 alone. His(6)-STR1 immobilized on Ni-NTA can be used for enzymatic synthesis of strictosidines on a preparative scale. With the newly co-expressed His(6)-STR1, novel 3alpha(S)-12-azastrictosidine was obtained by enzymatic catalysis of 7-azatryptamine and secologanin. The results obtained are of significant importance for application to chemo-enzymatic approaches leading to diversification of alkaloids with novel improved structures.
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Synthesis of polysubstituted 5-aminooxazoles from alpha-diazocarbonyl esters and alpha-isocyanoacetamides.
Org. Lett.
PUBLISHED: 01-07-2010
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A novel and efficient reaction for the synthesis of 2-keto-5-aminooxazoles is developed. The entire sequence is realized by simply heating a xylene solution of alpha-diazocarbonyl esters and alpha-isocyanoacetamides without any promoters. A possible mechanism for the entire sequence is proposed.
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Hepatic differentiation of rat mesenchymal stem cells by a small molecule.
ChemMedChem
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Mesenchymal stem cells (MSCs) are capable of self-renewal and multilineage differentiation. A periodic acid-Schiff (PAS) stain-based assay was developed to screen for small-molecule inducers of hepatic differentiation of bone marrow MSCs. 2-(4-Bromophenyl)-N-(4-fluorophenyl)-3-propyl-3H-imidazo[4,5-b]pyridin-5-amine (SJA710-6) was identified as a novel small molecule able to induce the differentiation of rat MSCs (rMSCs) toward hepatocyte-like cells in vitro, where rMSCs treated with SJA710-6 have typical morphological and functional characteristics of hepatic cells, including glycogen storage, urea secretion, uptake of low density lipoprotein (LDL) and expression of hepatocyte-specific genes and proteins. Expression of FoxH1 (FAST1/2) induces the differentiation of rMSCs towards hepatocyte-like cells, suggesting that this gene plays an important role in the hepatic fate specification of rMSCs.
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Comparison of different assessments for evaluating malnutrition in Chinese patients with end-stage renal disease with maintenance hemodialysis.
Nutr Res
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Nutritional status can be evaluated by the malnutrition-inflammation score (MIS), bioelectrical impedance analysis (BIA), and modified quantitative subjective global assessment (MQSGA). This study sought to determine the value of these methods for detecting malnutrition in patients with end-stage renal disease (ESRD) who were undergoing maintenance hemodialysis. A total of 84 patients with ESRD with maintenance hemodialysis were recruited for the evaluation of their nutritional states by MQSGA, MIS, and BIA. The potential correlation among these methods was analyzed, and there was a significant difference in the percentage of patients with malnutrition as determined by these methods. Although only 1 of 84 patients had a body fat percentage that was below normal, based on the BIA, all of the patients displayed malnutrition as analyzed by MIS, and 56 of 84 patients had malnutrition as determined by MQSGA. Importantly, the MQSGA scores were positively correlated with the MIS scores (r = 0.924, r² = 0.855, P < .05), whereas no close association was found in results obtained by MQSGA score and BIA (r = -0.169, r² = 0.029, P > .05) in this population. Our data indicate that MIS, not BIA, is a sensitive method for the evaluation of malnutrition in Chinese patients with ESRD with maintenance hemodialysis.
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Scaffold tailoring by a newly detected Pictet-Spenglerase activity of strictosidine synthase: from the common tryptoline skeleton to the rare piperazino-indole framework.
J. Am. Chem. Soc.
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The Pictet-Spenglerase strictosidine synthase (STR1) has been recognized as a key enzyme in the biosynthesis of some 2000 indole alkaloids in plants, some with high therapeutic value. In this study, a novel function of STR1 has been detected which allows for the first time a simple enzymatic synthesis of the strictosidine analogue 3 harboring the piperazino[1,2-a]indole (PI) scaffold and to switch from the common tryptoline (hydrogenated carboline) to the rare PI skeleton. Insight into the reaction is provided by X-ray crystal analysis and modeling of STR1 ligand complexes. STR1 presently provides exclusively access to 3 and can act as a source to generate by chemoenzymatic approaches libraries of this novel class of alkaloids which may have new biological activities. Synthetic or natural monoterpenoid alkaloids with the PI core have not been reported before.
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JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

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