Other Publications (15)
- Chemical & Pharmaceutical Bulletin
- Journal of Microbiology and Biotechnology
- The Turkish Journal of Pediatrics
- Auris, Nasus, Larynx
- International Journal of Pediatric Otorhinolaryngology
- Protein & Cell
- Journal of Industrial Microbiology & Biotechnology
- European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
- The EMBO Journal
- The Journal of Allergy and Clinical Immunology
- International Journal of Audiology
- Proceedings of the National Academy of Sciences of the United States of America
- ORL; Journal for Oto-rhino-laryngology and Its Related Specialties
- Neurochemical Research
- Journal of Immunology (Baltimore, Md. : 1950)
Articles by Yaoyao Fu in JoVE
Highly Sensitive and Rapid Fluorescence Detection with a Portable FRET Analyzer Haseong Kim*1, Gui Hwan Han*1, Yaoyao Fu1, Jongsik Gam2, Seung Goo Lee1,3 1Synthetic Biology & Bioengineering Research Center, Korea Research Institute of Bioscience and Biotechnology, 2College of Interdisciplinary & Creative Studies, Konyang University, 3Biosystems and Bioengineering Program, University of Science and Technology This protocol describes the rapid and highly sensitive quantification of Förster resonance energy transfer (FRET) sensor data using a custom-made portable FRET analyzer. The device was used to detect maltose within a critical temperature range that maximizes detection sensitivity, enabling practical and efficient assessment of sugar content.
Other articles by Yaoyao Fu on PubMed
Purification and Characterization of New Special Ginsenosidase Hydrolyzing Multi-glycisides of Protopanaxadiol Ginsenosides, Ginsenosidase Type I Chemical & Pharmaceutical Bulletin. Feb, 2007 | Pubmed ID: 17268094 In this paper, the new type ginsenosidase which hydrolyzing multi-glycosides of ginsenoside, named ginsenoside type I from Aspergillus sp.g48p strain was isolated, characterized and generally described. The enzyme molecular weight was about 80 kDa. Ginsenosidase type I can hydrolyze different glycoside of protopanaxadiol type ginsenosides (PPD); i.e., can hydrolyze the 3(carbon)-O-beta-glucoside of Rb1, Rb2, Rb3, Rc, Rd; can hydrolyze 20(carbon)-O-beta-glucoside of Rb1, 20-O-beta-xyloside of Rb3, 20-O-alpha-arabinoside(p) of Rb2 and 20-O-alpha-arabinoside(f) of Rc to produce mainly F2, compound-K (C-K) and small Rh2, but can not hydrolyze the glycosides of protopanaxatriol type ginsenoside (PPT) such as Re, Rf, Rg1. So, when the ginsenosidase type I hydrolyzed ginsenosides, the enzyme selected ginsenoside-aglycone type, can hydrolyze different glycosides of PPD type ginsenoside; however no selected glycoside type, can hydrolyze multi-glycosides of PPD type ginsenosides. These properties were novel properties, and differentiated with the other previously described glycosidases.
New Dioscin-glycosidase Hydrolyzing Multi-glycosides of Dioscin from Absidia Strain Journal of Microbiology and Biotechnology. Jun, 2010 | Pubmed ID: 20622501 A novel dioscin-glycosidase that specifically hydrolyzes multi-glycosides such as 3-O-alpha-L-(1 --> 4)-rhamnoside, 3-O-alpha-L-(1 --> 2)-rhamnoside, 3-O-alpha-L-(1 --> 4)-arabinoside and beta-D-glucoside on diosgenin was isolated from Absidia sp.d38 strain; and it was purified and characterized. The molecular weight of the new dioscin-glycosidase is about 55 kDa in SDS-PAGE. The the dioscin-glycosidase gradually hydrolyzes either 3-O-alpha-L-(1 --> 4)-Rha or 3-O-alpha-L-(1 --> 2)-Rha of dioscin to 3-O-alpha-L-Rha-beta-D-Glc-diosgenin; further rapidly hydrolyzes the other alpha-L-Rha of 3-O-alpha-L-Rha-beta-D-Glc-diosgenin to main intermediate products 3-O-beta-D-glc-diosgenin; and subsequently hydrolyzes intermediate products to final product of aglycone; the new enzyme also gradually hydrolyzes 3-O-alpha-L-(1 --> 4)-arabinoside, 3-O-alpha-L-(1 --> 2)-rhamnoside and beta-D-glucoside of [3-O-alpha-L-(1 --> 4)-Ara, 3-O-alpha-L-(1 --> 2)-Rha]-beta-D-Glc-diosgenin into final product diosgenin, exhibiting significant differences from previously reported glycosidases. The optimal temperature of the new dioscin-glycosidase is 40 degrees C and the optimal pH is 5.0. The activity of the new dioscin-glycosidase was not affected by the Na+, K+ and Mg2+ ions; it was significantly inhibited by the Cu2+ and Hg2+ ions; and it was slightly affected by the Ca2+ ions.
Clinical Analysis Based on 208 Patients with Microtia (especially Reviewed Oculo-auriculo-vertebral Spectrum, Hearing Test, CT Scan) The Turkish Journal of Pediatrics. Nov-Dec, 2010 | Pubmed ID: 21428189 Microtia is a common birth defect and characteristic of abnormal auricle. It can be isolated or occur as a part of syndromes involving the first and second bronchial arch structures, such as oculo-auriculo-vertebral spectrum. We conducted a careful review of the literature regarding the clinical features of patients with microtia, but found few studies with respect to the Chinese population. In this study, we explored the clinical features of a single clinic population of 208 Chinese individuals with microtia. It showed that 15 cases (7.2%) had been afflicted with middle ear cholesteatoma, which would have brought about risky complications without an immediate removal; that 12 of 68 contralateral, normal-appearing ears had presented mild to moderate conductive or combined hearing loss (21-70 dB); that the degree of hearing loss deteriorated as the grade of microtia increased, with significant differences between grades I and III (p < 0.05); and that there was a male predominance, with the right side more likely to be affected.
Intratympanic Dexamethasone As Initial Therapy for Idiopathic Sudden Sensorineural Hearing Loss: Clinical Evaluation and Laboratory Investigation Auris, Nasus, Larynx. Apr, 2011 | Pubmed ID: 20817429 To evaluate the effect of intratympanic dexamethasone (ITD) as initial therapy for idiopathic sudden sensorineural hearing loss (ISSHL) as well as to determine the concentration-dependent time course distribution of dexamethasone in the inner ear.
Facial Nerve Lying Lateral to Ossicles in One Case of Congenital Aural Atresia International Journal of Pediatric Otorhinolaryngology. Apr, 2011 | Pubmed ID: 21281971 An abnormal facial nerve (FN) course can be found in a significant number of patients with congenital aural atresia. However, the literature does not include any cases in which the tympanic portion of the FN was displaced lateral to ossicles. We report a unique case of unilateral congenital aural atresia with this rare FN displacement. A review of the existing literature and a discussion are also provided.
CCR10 and Its Ligands in Regulation of Epithelial Immunity and Diseases Protein & Cell. Aug, 2012 | Pubmed ID: 22684736 Epithelial tissues covering the external and internal surface of a body are constantly under physical, chemical or biological assaults. To protect the epithelial tissues and maintain their homeostasis, multiple layers of immune defense mechanisms are required. Besides the epithelial tissue-resident immune cells that provide the first line of defense, circulating immune cells are also recruited into the local tissues in response to challenges. Chemokines and chemokine receptors regulate tissue-specific migration, maintenance and functions of immune cells. Among them, chemokine receptor CCR10 and its ligands chemokines CCL27 and CCL28 are uniquely involved in the epithelial immunity. CCL27 is expressed predominantly in the skin by keratinocytes while CCL28 is expressed by epithelial cells of various mucosal tissues. CCR10 is expressed by various subsets of innate-like T cells that are programmed to localize to the skin during their developmental processes in the thymus. Circulating T cells might be imprinted by skin-associated antigen- presenting cells to express CCR10 for their recruitment to the skin during the local immune response. On the other hand, IgA antibody-producing B cells generated in mucosa-associated lymphoid tissues express CCR10 for their migration and maintenance at mucosal sites. Increasing evidence also found that CCR10/ligands are involved in regulation of other immune cells in epithelial immunity and are frequently exploited by epithelium-localizing or -originated cancer cells for their survival, proliferation and evasion from immune surveillance. Herein, we review current knowledge on roles of CCR10/ligands in regulation of epithelial immunity and diseases and speculate on related important questions worth further investigation.
Preparation of Progenin III from Total Steroidal Saponins of Dioscorea Nipponica Makino Using a Crude Enzyme from Aspergillus Oryzae Strain Journal of Industrial Microbiology & Biotechnology. May, 2013 | Pubmed ID: 23471779 Progenin III, one of the most active spirostanol saponins, is a potential candidate for anti-cancer therapy due to its strong antitumor activity and low hemolytic activity. However, the concentration of progenin III is extremely low in natural Dioscorea plants. In this paper, the progenin III production from total steroidal saponins of Dioscorea nipponica Makino was studied using the crude enzyme from Aspergillus oryzae DLFCC-38. The crude enzyme converting total steroidal saponins into progenin III was obtained from the A. oryzae DLFCC-38 culture. For enzyme production, the strain was cultured for 72 h at 30 °C with shaking at 150 rpm in 5 % (w/v) malt extract medium containing 2 % (v/v) extract of D. nipponica as the enzyme inducer. The crude enzyme converted total steroidal saponins into major progenin III with a high yield when the reaction was carried out for 9 h at 50 °C and pH 5.0 with the 20 mg/ml of substrate. In the preparation of progenin III, 117 g of crude progenin III was obtained from 160 g of substrate, and the crude product was purified with silica gel column to obtain 60.3 g progenin III of 93.4 % purity.
The Location of the Mastoid Portion of the Facial Nerve in Patients with Congenital Aural Atresia European Archives of Oto-rhino-laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery. Jun, 2014 | Pubmed ID: 23793597 In order to investigate the location of the mastoid portion of the facial nerve in patients with congenital aural atresia and to assess its effect on the round window middle ear implant (MEI) transducer implantation approach, 70 patients with unilateral congenital aural atresia were examined by computer tomography (CT). The patients were divided into two groups based on their ages: 44 patients in Group A (2-12 years) and 26 patients in Group B (13-29 years). CT scans were reviewed for each patient. Based on the CT findings, the mastoid portion of the facial nerve's spatial configuration with respect to the oval and round windows was qualitatively recorded. Additionally, the exact location of the facial nerve was measured quantitatively. The results suggested that of the 70 deformed ears, 57 had facial nerves located at the round window, six at the oval window, and seven at the normal site. Of the 70 normal opposite ears, 63 had facial nerves located at the normal site, and the other seven had facial nerves located at the round window. Based on the quantitative measurements, the mastoid portion of the facial nerve was more anteriorly positioned in the deformed ears: 3.44-6.09 mm more anteriorly located in Group A and 4.35-7.41 mm more anteriorly located in Group B. In conclusion, in patients with congenital aural atresia, the dislocation of the facial nerve could have significant effects on the surgical approach to round window MEI transducer implantation.
Crystal Structures of the Structure-selective Nuclease Mus81-Eme1 Bound to Flap DNA Substrates The EMBO Journal. May, 2014 | Pubmed ID: 24733841 The Mus81-Eme1 complex is a structure-selective endonuclease with a critical role in the resolution of recombination intermediates during DNA repair after interstrand cross-links, replication fork collapse, or double-strand breaks. To explain the molecular basis of 3' flap substrate recognition and cleavage mechanism by Mus81-Eme1, we determined crystal structures of human Mus81-Eme1 bound to various flap DNA substrates. Mus81-Eme1 undergoes gross substrate-induced conformational changes that reveal two key features: (i) a hydrophobic wedge of Mus81 that separates pre- and post-nick duplex DNA and (ii) a "5' end binding pocket" that hosts the 5' nicked end of post-nick DNA. These features are crucial for comprehensive protein-DNA interaction, sharp bending of the 3' flap DNA substrate, and incision strand placement at the active site. While Mus81-Eme1 unexpectedly shares several common features with members of the 5' flap nuclease family, the combined structural, biochemical, and biophysical analyses explain why Mus81-Eme1 preferentially cleaves 3' flap DNA substrates with 5' nicked ends.
CCR10 Regulates Balanced Maintenance and Function of Resident Regulatory and Effector T Cells to Promote Immune Homeostasis in the Skin The Journal of Allergy and Clinical Immunology. Sep, 2014 | Pubmed ID: 24767879 CCR10 and CCL27 make up the most skin-specific chemokine receptor/ligand pair implicated in skin allergy and inflammatory diseases, including atopic dermatitis and psoriasis. This pair is thought to regulate the migration, maintenance, or both of skin T cells and is suggested to be therapeutic targets for treatment of skin diseases. However, the functional importance of CCR10/CCL27 in vivo remains elusive.
Congenital Aural Atresia and Stenosis: Surgery Strategies and Long-term Results International Journal of Audiology. Jul, 2014 | Pubmed ID: 24909697 To compare the patients who underwent surgery for congenital aural atresia (CAA) with congenital aural stenosis (CAS) for the stability of hearing results and complications during long-term follow-up.
Structure of the ArgRS-GlnRS-AIMP1 Complex and Its Implications for Mammalian Translation Proceedings of the National Academy of Sciences of the United States of America. Oct, 2014 | Pubmed ID: 25288775 In higher eukaryotes, one of the two arginyl-tRNA synthetases (ArgRSs) has evolved to have an extended N-terminal domain that plays a crucial role in protein synthesis and cell growth and in integration into the multisynthetase complex (MSC). Here, we report a crystal structure of the MSC subcomplex comprising ArgRS, glutaminyl-tRNA synthetase (GlnRS), and the auxiliary factor aminoacyl tRNA synthetase complex-interacting multifunctional protein 1 (AIMP1)/p43. In this complex, the N-terminal domain of ArgRS forms a long coiled-coil structure with the N-terminal helix of AIMP1 and anchors the C-terminal core of GlnRS, thereby playing a central role in assembly of the three components. Mutation of AIMP1 destabilized the N-terminal helix of ArgRS and abrogated its catalytic activity. Mutation of the N-terminal helix of ArgRS liberated GlnRS, which is known to control cell death. This ternary complex was further anchored to AIMP2/p38 through interaction with AIMP1. These findings demonstrate the importance of interactions between the N-terminal domains of ArgRS and AIMP1 for the catalytic and noncatalytic activities of ArgRS and for the assembly of the higher-order MSC protein complex.
A New Three-Dimensional Template for the Fabrication and Localization of an Autogenous Cartilage Framework During Microtia Reconstruction ORL; Journal for Oto-rhino-laryngology and Its Related Specialties. 2015 | Pubmed ID: 26044923 To assist with the accurate fabrication and localization of a costal cartilage framework for auricular reconstruction, three-dimensional (3D) digital and solid templates including the auricle and guide plate were made for microtia patients.
Salicylate-Induced Hearing Loss Trigger Structural Synaptic Modifications in the Ventral Cochlear Nucleus of Rats Via Medial Olivocochlear (MOC) Feedback Circuit Neurochemical Research. Jun, 2016 | Pubmed ID: 26886762 Lesion-induced cochlear damage can result in synaptic outgrowth in the ventral cochlear nucleus (VCN). Tinnitus may be associated with the synaptic outgrowth and hyperactivity in the VCN. However, it remains unclear how hearing loss triggers structural synaptic modifications in the VCN of rats subjected to salicylate-induced tinnitus. To address this issue, we evaluated tinnitus-like behavior in rats after salicylate treatment and compared the amplitude of the distortion product evoked otoacoustic emission (DPOAE) and auditory brainstem response (ABR) between control and treated rats. Moreover, we observed the changes in the synaptic ultrastructure and in the expression levels of growth-associated protein (GAP-43), brain-derived neurotrophic factor (BDNF), the microglial marker Iba-1 and glial fibrillary acidic protein (GFAP) in the VCN. After salicylate treatment (300 mg/kg/day for 4 and 8 days), analysis of the gap prepulse inhibition of the acoustic startle showed that the rats were experiencing tinnitus. The changes in the DPOAE and ABR amplitude indicated an improvement in cochlear sensitivity and a reduction in auditory input following salicylate treatment. The treated rats displayed more synaptic vesicles and longer postsynaptic density in the VCN than the control rats. We observed that the GAP-43 expression, predominantly from medial olivocochlear (MOC) neurons, was significantly up-regulated, and that BDNF- and Iba-1-immunoreactive cells were persistently decreased after salicylate administration. Furthermore, GFAP-immunoreactive astrocytes, which is associated with synaptic regrowth, was significantly increased in the treated groups. Our study revealed that reduced auditory nerve activity triggers synaptic outgrowth and hyperactivity in the VCN via a MOC neural feedback circuit. Structural synaptic modifications may be a reflexive process that compensates for the reduced auditory input after salicylate administration. However, massive increases in excitatory synapses in the VCN may represent a detrimental process that causes central hyperactivity, leading to tinnitus.
Cutting Edge: Skin CCR10+ CD8+ T Cells Support Resident Regulatory T Cells Through the B7.2/Receptor Axis To Regulate Local Immune Homeostasis and Response Journal of Immunology (Baltimore, Md. : 1950). Jun, 2016 | Pubmed ID: 27183612 Resident T cells in barrier tissues are important in protecting against foreign agents but can also contribute to inflammatory diseases if dysregulated. How T cell homeostasis is maintained in barrier tissues is still poorly understood. We report that resident CD8(+) T cells directly support maintenance of regulatory T cells (Tregs) in the skin to promote immune homeostasis. Impaired establishment of resident CD8(+) T cells caused by knockout of the skin-homing chemokine receptor CCR10 resulted in an altered balance of resident Tregs and CD4(+) effector T cells in the skin and overreactive inflammatory responses to cutaneous stimulations. Furthermore, B7.2 expressed on skin CD8(+) T cells supports the survival of Tregs, likely through interaction with its receptor CTLA-4, which is highly expressed on skin Tregs. Our findings provide novel insights into T cell homeostatic regulation in the skin and may improve our understanding of the pathobiology of tissue inflammatory diseases.