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Chen SY, Liu PQ, Qin DX, Lv H, Zhou HQ, Xu Y. E3 ubiquitin ligase NEDD4L inhibits epithelial-mesenchymal transition by suppressing the β-catenin/HIF-1α positive feedback loop in chronic rhinosinusitis with nasal polyps. Acta Pharmacol Sin 2024; 45:831-843. [PMID: 38052867 PMCID: PMC10943232 DOI: 10.1038/s41401-023-01190-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 11/01/2023] [Indexed: 12/07/2023] Open
Abstract
Chronic rhinosinusitis with nasal polyp (CRSwNP) is a refractory inflammatory disease with epithelial-mesenchymal transition (EMT) as one of the key features. Since ubiquitin modification has been shown to regulate the EMT process in other diseases, targeting ubiquitin ligases may be a potential strategy for the treatment of CRSwNP. In this study we investigated whether certain E3 ubiquitin ligases could regulate the EMT process in CRSwNP, and whether these regulations could be the potential drug targets as well as the underlying mechanisms. After screening the potential drug target by bioinformatic analyses, the expression levels of three potential E3 ubiquitin ligases were compared among the control, eosinophilic nasal polyp (ENP) and non-eosinophilic nasal polyp (NENP) group in clinical samples, and the significant decrement of the expression level of NEDD4L was found. Then, IP-MS, bioinformatics and immunohistochemistry studies suggested that low NEDD4L expression may be associated with the EMT process. In human nasal epithelial cells (hNECs) and human nasal epithelial cell line RPMI 2650, knockdown of NEDD4L promoted EMT, while upregulating NEDD4L reversed this effect, suggesting that NEDD4L inhibited EMT in nasal epithelial cells. IP-MS and Co-IP studies revealed that NEDD4L mediated the degradation of DDR1. We demonstrated that NEDD4L inhibited the β-catenin/HIF-1α positive feedback loop either directly (degrading β-catenin and HIF-1α) or indirectly (mediating DDR1 degradation). These results were confirmed in a murine NP model in vivo. This study for the first time reveals the regulatory role of ubiquitin in the EMT process of nasal epithelial cells, and identifies a novel drug target NEDD4L, which has promising efficacy against both ENP and NENP by suppressing β-catenin/HIF-1α positive feedback loop.
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Affiliation(s)
- Si-Yuan Chen
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Pei-Qiang Liu
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Dan-Xue Qin
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Hao Lv
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Hui-Qin Zhou
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Yu Xu
- Department of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
- Department of Rhinology and Allergy, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
- Research Institute of Otolaryngology-Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan, 430060, China.
- Hubei Province Key Laboratory of Allergy and Immunology, Wuhan University, Wuhan, 430060, China.
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Zhou HQ, Li Q, Shi QL. [A case of subglottic cyst through the cricothyroid membrane to the neck]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2022; 57:1127-1129. [PMID: 36177570 DOI: 10.3760/cma.j.cn115330-20220113-00027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Affiliation(s)
- H Q Zhou
- Department of Otorhinolaryngology, Children's Hospital of Nanjing Medical University, Nanjing 210000, China
| | - Q Li
- Department of Otorhinolaryngology, Children's Hospital of Nanjing Medical University, Nanjing 210000, China
| | - Q L Shi
- Department of Otorhinolaryngology, Children's Hospital of Nanjing Medical University, Nanjing 210000, China
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Tan YY, Zhou HQ, Lin YJ, Yi LT, Chen ZG, Cao QD, Guo YR, Wang ZN, Chen SD, Li Y, Wang DY, Qiao YK, Yan Y. FGF2 is overexpressed in asthma and promotes airway inflammation through the FGFR/MAPK/NF-κB pathway in airway epithelial cells. Mil Med Res 2022; 9:7. [PMID: 35093168 PMCID: PMC8800304 DOI: 10.1186/s40779-022-00366-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Accepted: 01/09/2022] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Airway inflammation is the core pathological process of asthma, with the key inflammatory regulators incompletely defined. Recently, fibroblast growth factor 2 (FGF2) has been reported to be an inflammatory regulator; however, its role in asthma remains elusive. This study aimed to investigate the immunomodulatory role of FGF2 in asthma. METHODS First, FGF2 expression was characterised in clinical asthma samples and the house dust mite (HDM)-induced mouse chronic asthma model. Second, recombinant mouse FGF2 (rm-FGF2) protein was intranasally delivered to determine the effect of FGF2 on airway inflammatory cell infiltration. Third, human airway epithelium-derived A549 cells were stimulated with either HDM or recombinant human interleukin-1β (IL-1β) protein combined with or without recombinant human FGF2. IL-1β-induced IL-6 or IL-8 release levels were determined using enzyme-linked immunosorbent assay, and the involved signalling transduction was explored via Western blotting. RESULTS Compared with the control groups, the FGF2 protein levels were significantly upregulated in the bronchial epithelium and alveolar areas of clinical asthma samples (6.70 ± 1.79 vs. 16.32 ± 2.40, P = 0.0184; 11.20 ± 2.11 vs. 21.00 ± 3.00, P = 0.033, respectively) and HDM-induced asthmatic mouse lung lysates (1.00 ± 0.15 vs. 5.14 ± 0.42, P < 0.001). Moreover, FGF2 protein abundance was positively correlated with serum total and anti-HDM IgE levels in the HDM-induced chronic asthma model (R2 = 0.857 and 0.783, P = 0.0008 and 0.0043, respectively). Elevated FGF2 protein was mainly expressed in asthmatic bronchial epithelium and alveolar areas and partly co-localised with infiltrated inflammatory cell populations in HDM-induced asthmatic mice. More importantly, intranasal instillation of rm-FGF2 aggravated airway inflammatory cell infiltration (2.45 ± 0.09 vs. 2.88 ± 0.14, P = 0.0288) and recruited more subepithelial neutrophils after HDM challenge [(110.20 ± 29.43) cells/mm2 vs. (238.10 ± 42.77) cells/mm2, P = 0.0392] without affecting serum IgE levels and Th2 cytokine transcription. In A549 cells, FGF2 was upregulated through HDM stimulation and promoted IL-1β-induced IL-6 or IL-8 release levels (up to 1.41 ± 0.12- or 1.44 ± 0.14-fold change vs. IL-1β alone groups, P = 0.001 or 0.0344, respectively). The pro-inflammatory effect of FGF2 is likely mediated through the fibroblast growth factor receptor (FGFR)/mitogen-activated protein kinase (MAPK)/nuclear factor kappa B (NF-κB) pathway. CONCLUSION Our findings suggest that FGF2 is a potential inflammatory modulator in asthma, which can be induced by HDM and acts through the FGFR/MAPK/NF-κB pathway in the airway epithelial cells.
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Affiliation(s)
- Yuan-Yang Tan
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Hui-Qin Zhou
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Yu-Jing Lin
- Department of Pathology, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Liu-Tong Yi
- Department of Pathology, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Zhuang-Gui Chen
- Department of Pediatrics, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510630, China
| | - Qing-Dong Cao
- Department of Cardiothoracic Surgery, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Yan-Rong Guo
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Zhao-Ni Wang
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Shou-Deng Chen
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - Yang Li
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China
| | - De-Yun Wang
- Department of Otolaryngology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, Singapore, 119228, Singapore
| | | | - Yan Yan
- Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China. .,Central Laboratory, The Fifth Affiliated Hospital, Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China.
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Tong XT, Liu PQ, Zhou HQ, Jin J, Liu KY, Huang JY, Zhang W, Chen SM, Tao ZZ, Xu Y. [The expression and significance of TRPM8 among chronic rhinosinusitis with nasal polyps]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2021; 56:1059-1065. [PMID: 34666466 DOI: 10.3760/cma.j.cn115330-20210430-00243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To compare the expression and difference of melastatin-related transient receptor potential 8(TRPM8) among chronic rhinosinusitis, nasal polyps and normal mucosa tissues. And to explore the significant expression of TRPM8 among CRSwNP. Methods: Fifty-one patients underwent endoscopic sinus surgery in the Department of Otorhinolaryngology Head and Neck Surgery of Renmin Hospital of Wuhan University from February 2019 to January 2020 were recruited, including 33 males and 18 females, aged from 14 to 65 years old (34.55±1.689).Immunohistochemistry was used to detected the expression of TRPM8 protein among CRSsNP(17),CRSwNP (17) and control tissuses(17). In addition, the correlation between the expression of TRPM8 protein in CRSwNP patients and preoperative CT Lund-Mackay scores and preoperative VAS scores and sinonasal outcome test-20 scores was analyzed, respectively. The primary human nasal epithelial cells were cultured in vitro and the expression of TRPM8 was detected by quantitative real-time PCR and western blotting. The tissue in control group, chronic rhinosinusitis without nasal polyps (CRSsNP) group and the CRSwNP group were collected and grinded into tissue homogenized. The expression of TRPM8 protein was detected by western blotting after 24 h stimulation after homogenate was added into the medium of RPMI 2650 and primary nasal epithelial cells. Results: Compared with the control, the expression of TRPM8 was significantly up-regulated in nasal polyps (t=6.852, P<0.05). TRPM8 was mainly expressed in epithelial cells. The expression of TRPM8 in the epithelial cells of CRSsNP had no difference with the control group (t=1.980, P>0.05). In addition, the expression of TRPM8 in CRSwNP patients was positively correlated with the preoperative CT Lund-Mackay scores and VAS scores and SNOT-20 scores (r=0.512, P<0.05;r=0.853, P<0.01;r=0.814, P<0.01). After cultured primary epithelial cells in vitro, the expression level of TRPM8 in epithelial cells derived from nasal polyp was significantly higher than that in control group (t=8.845, P<0.05). By adding the homogenization of control and CRSsNP and CRSwNP tissues, the expression of TRPM8 in RPMI 2650 cells and primary nasal epithelial cells was changed and that was significantly increased after adding the homogenization of the group of CRSwNP. Conclusion: TRPM8 is highly expressed in nasal polyps epithelial cells, suggesting that TRPM8 may be involved in the pathogenesis of nasal polyps regulated by nasal epithelial cells.
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Affiliation(s)
- X T Tong
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - P Q Liu
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - H Q Zhou
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - J Jin
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - K Y Liu
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - J Y Huang
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - W Zhang
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - S M Chen
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Z Z Tao
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Y Xu
- Department of Otolaryngology Head and Neck Surgery, Renmin Hospital of Wuhan University, Wuhan 430060, China
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Qiu ML, Xie Y, Wang XH, Wang XQ, Zhao DB, Zhou HQ, Zhou YQ, Yan L, Liang BL, Shen HL, Cao SY, Ding Y, Gu JR, Zeng XF, Yang KH. [Practice guideline for patients with osteoporosis]. Zhonghua Nei Ke Za Zhi 2020; 59:953-959. [PMID: 33256336 DOI: 10.3760/cma.j.cn112138-20200904-00792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In recent years, osteoporosis (OP) has become one of the main diseases affecting the health of middle-aged and elderly people in China, and the prevalence of OP has increased significantly. The clinical diagnosis and treatment guidelines for this disease are also constantly updated. The overall principles speciallyemphasise that doctors and patients need to work together to negotiate the details of the diagnosis and treatment guidelines, in order to improve the OP clinical diagnosis and treatment rate. Therefore, patients' knowledge of the disease, understanding of clinical guidelines, and cooperation with doctors to implement diagnosis and treatment plans are very important. In this study, from the most concerned issues of the patients, we established the OP patient practice guideline working group. 14 recommendations, as the OP patient practice guidelines, are proposed in accordance with the relevant principles of the "World Health Organization guidelines development manual" and the international normative process.
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Affiliation(s)
- M L Qiu
- Guangdong Provincial Clinical Research Center for Immunological Diseases, Guangzhou 510630, China
| | - Y Xie
- Guangdong Provincial Clinical Research Center for Immunological Diseases, Guangzhou 510630, China
| | - X H Wang
- Department of Radiology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - X Q Wang
- WHO Collaborating Centre for Guideline Implementation and Knowledge Translation/Evidence Based Medicine Center, Lanzhou University, Lanzhou 730000, China
| | - D B Zhao
- Department of Rheumatology and Immunology, First Affiliated Hospital of the Second Military Medical University(Changhai Hospital), Shanghai 200433, China
| | - H Q Zhou
- Department of Rheumatology and Immunology, Fourth Medical Center of People's Liberation Army General Hospital, Beijing 100048, China
| | - Y Q Zhou
- Medical Ethics Committee, Clinical Research Center, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou 510630, China
| | - L Yan
- Department of Endocrinology, Second Affiliated Hospital of Sun Yat-sen University, Guangzhou 510030, China
| | - B L Liang
- Department of Radiology, Second Affiliated Hospital of Sun Yat-sen University, Guangzhou 510030, China
| | - H L Shen
- Osteoporosis Patient Organization of Guangzhou Pukang Charity Foundation, Guangzhou 510630, China
| | - S Y Cao
- Guangdong Provincial Clinical Research Center for Immunological Diseases, Guangzhou 510630, China
| | - Y Ding
- Department of Orthopedics, Second Affiliated Hospital of Sun Yat-sen University, Guangzhou 510030, China
| | - J R Gu
- Guangdong Provincial Clinical Research Center for Immunological Diseases, Guangzhou 510630, China; Department of Rhenmatology and Immunology, Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen 518107, China
| | - X F Zeng
- Department of Rheumatology and Immunology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - K H Yang
- WHO Collaborating Centre for Guideline Implementation and Knowledge Translation/Evidence Based Medicine Center, Lanzhou University, Lanzhou 730000, China
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Ye B, Huang YH, Zhang L, Tian XL, Zhang Q, Lu MH, Xu PH, Guo J, Kong XY, Zhou HQ. [Clinical analysis of FRAX in the assessment of fracture risk in patients with rheumatic disease in three medical center]. Zhonghua Yi Xue Za Zhi 2019; 99:3345-3349. [PMID: 31715673 DOI: 10.3760/cma.j.issn.0376-2491.2019.42.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: The aim is to analyze the fracture risk in rheumatic patients by fracture risk assessment tool (FRAX), which is recommended by World Health Organization (WHO), so that we can prevent the occurrence of osteoporotic fracture earlier. Methods: Totally 617 participants, 204 out-patients with rheumatism, 204 in-patients with rheumatism and 209 healthy controls, from March to October in 2018 of Fourth Medical Center of PLA General Hospital, Jishuitan Hospital and China-Japan Friendship Hospital, were enrolled in this study. The probability of hip fracture (PHF) and major osteoporotic fracture (PMOF) in 10 years with FRAX were compared, and the differences between taking sleroids or not and with or without bone mass density (BMD) of femoral neck were evaluated. Correlation analysis was conducted between PHF, PMOF and clinical information, including age, disease duration, gender, steroid usage, osteocalcin, P1NP and β-crosslaps. Results: There was no significant difference in PMOF within 10 years (3.455±2.690 vs 2.973±2.149 vs 3.323±1.828) among the three groups (P>0.05), but the PHF (0.986±1.619 vs 0.515±0.873 vs 0.149±0.311) was different (P<0.05). PHF and PMOF increased gradually with age. PMOF of patients without glucocorticoid therapy in 10 years was lower than that of patients with glucocorticoid (3.554±2.584 vs 2.857±2.238, P<0.05). There is no difference between the results of FRAX calculated with BMD or not (3.012±2.231 vs 3.207±2.601, P>0.05). PHF and PMOF were positively correlated with age, course of disease, glucocorticoid use and osteocalcin level, while PHF was negatively correlated with TP1NP among in-patients. Conclusion: The prevalence of 10-year hip fracture calculated by FRAX in rheumatism patients is higher than that of healthy group. FRAX can be used to calculate fracture risk without BMD. Combination of FRAX and bone turnover markers may be more effective in prediction of osteoporotic fracture in rheumatic patients.
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Affiliation(s)
- B Ye
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - Y H Huang
- Department of Rheumatology and Immunology,Jishuitan Hospital,Beijing 100096, China
| | - L Zhang
- Department of Rheumatology and Immunology,China-Japan Friendship Hospital,Beijing 100029,China
| | - X L Tian
- Department of Rheumatology and Immunology,China-Japan Friendship Hospital,Beijing 100029,China
| | - Q Zhang
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - M H Lu
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - P H Xu
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - J Guo
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - X Y Kong
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
| | - H Q Zhou
- Department of Rheumatology, Fourth Medical Center of PLA General Hospital, Beijing 100048, China
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Li SG, Zhang Q, Zhou HQ. [Comparison of disease activities and extent measurements for anti-neutrophil cytoplasmic autoantibody-associated vasculitis]. Beijing Da Xue Xue Bao Yi Xue Ban 2018; 50:1022-1026. [PMID: 30562775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
OBJECTIVE To investigate the significance of a set of seven disease activities and extension measurements and their correlations between one and another for anti-neutrophil cytoplasmic autoantibody associated vasculitis (AAV). METHODS A total of 121 patients from Peking University International Hospital and Fouth Medical Center of PLA General Hospital with confirmed diagnoses of AAV clinically were enrolled in the study, including 15 cases of eosinophilic granulomatous with polyangiitis (EGPA), 59 cases of granulomatous with polyangiitis (GPA) and 47 cases of microscopic polyangiitis (MPA). A hundred and twenty-one AAV patients were divided into death group and survival group according to their survival conditions. A set of seven disease assessment scales including Birmingham vasculitis activity score (BVAS)-1994, BVAS-2003, as well as BVAS/GPA, vasculitis damage index (VDI), disease extent index (DEI), five factor score (FFS)-1996, and FFS-2009 were measured and scored one by one, and their relationships which were represented by Spearman correlation coefficient were compared between one and another. RESULTS BVAS-1994, BVAS-2003, as well as BVAS/GPA, VDI, DEI, and FFS, all of those seven evaluation indexes of the AAV patients in the death group were significantly higher than those in the survival group (P<0.05). Except for BVAS/GPA, all those above indicators in the patients with EGPA were lower than those in the patients with GPA and those in the patients with MPA, and those in all of the AAV patients as a whole group. There were high correlations among BVAS-2003, BVAS-1994 and BVAS/GPA (r values were 0.9 and 0.7, respectively); BVAS-1994 was fairly correlated with BVAS/GPA (r=0.69); FFS-1996 and FFS-2009 were highly correlated (r=0.73) with each other; BVAS-1994, BVAS-2003 and BVAS/GPA were fairly correlated with DEI (with r values of 0.62, 0.65, and 0.62, respectively); VDI was also fairly correlated with BVAS-1994 and with BVAS-2003 (r values were 0.49 and 0.52, respectively). CONCLUSION All of those seven AAV assessment indicators above can be used as indicators of disease activity and prognosis in AAV patients, most of which were relevant within one and another. There were high correlations among BVAS-2003, BVAS-1994 and BVAS/GPA, and besides, there were also high correlations between FFS-1996 and FFS-2009.
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Affiliation(s)
- S G Li
- Department of Rheumatology and Immunology, Peking University International Hospital, Beijing 102206, China
| | - Q Zhang
- Department of Rheumatology, Fouth Medical Center of PLA General Hospital, Beijing 100048, China
| | - H Q Zhou
- Department of Rheumatology, Fouth Medical Center of PLA General Hospital, Beijing 100048, China
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Wu D, Zhao LZ, Wu YH, Zhang H, Zhang M, Tan QQ, Zhou HQ, Zhang FC, He JF. [Comparison of Dengue viral nonstructural protein 1 antigen testing kits]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:141-144. [PMID: 29429267 DOI: 10.3760/cma.j.issn.0253-9624.2018.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the sensitivity and specificity of commercial nonstructural protein 1 (NS1) testing kits for Dengue fever diagnose, and provide the evidence for diagnostic criteria revision. Methods: 300 PCR or virus isolation positive blood samples for dengue virus were collected from sentinel hospitals for dengue surveillance in Guangzhou, Dongguang and Zhongshang from May 2015 to Nov. 2016. At the same time, 308 PCR negative samples for Dengue virus were collected as control group. The information of the sample was collected using questionnaires. These samples were tested using imported and domestic ELISA and the colloidal gold-labeled kits that were widely used for detecting dengue NS1. Sensitivity, specificity and coincidence were calculated and analyzed, and Z hongshan's result was regarded as the reslut of the third part. Results: The positive group includes 133 males and 167 females, average ages are 47.2±13.3, 179, 110 and 11 of them is Dengue Ⅰ, Ⅱ and Ⅲ respectively. The negative group includes 154 males and 154 females, average ages are (40.1±11.6) years old. The sensitivity of domestic ELISA Kits (94.5%) is less than imported (99.5%), and the result has statistical significance (χ(2)=8.59, P=0.030), the specificity is 99.7% and 97.7% respectively; The sensitivity of imported and domestic the colloidal gold-labeled Kits is 97.5% and 96.5% respectively, both of specificities are 100%. The sensitivity and specificity of Dengue Ⅰ for NS1 test are more than 97.0%. The sensitivity of domestic ELISA and gold-labeled Kits is 90.0% and 95.0%, and the specificity is 96.8% and 100% respectively for Dengue Ⅱ test. The sensitivity of imported ELISA and gold-labeled Kits is 100% and 98.0%, and the specificity is 99.4% and 100% respectively for Dengue Ⅱ test. The result of the third party show the sensitivity and specificity of domestic ELISA and gold-labeled Kits are 90.0% and 98.0%, the differences has statistical significance (χ(2)=5.67, P=0.020). Conclusion: NS1 testing can be used as early dengue fever diagnose for higher sensitivity and specificity.
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Affiliation(s)
- D Wu
- Center for Disease Control and Prevention of Guangdong Province, Guangzhou 511430, China
| | - L Z Zhao
- Center for Disease Control and Prevention of Zhongshan, Zhongshan 528403, China
| | - Y H Wu
- The Eighth People's Hospital of Guangzhou, Guangzhou 510060, China
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Zhang Q, Zhou HQ, Li YH, Guo J, Xu PH, Lu MH, Liu XL, Wang L, Li SG. [The clinical analysis of 46 cases with antineutrophil cytoplasmic antibody-associated vasculitis]. Zhonghua Yi Xue Za Zhi 2017; 96:2146-9. [PMID: 27464538 DOI: 10.3760/cma.j.issn.0376-2491.2016.27.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To investigate the clinical features of patients with antineutrophil cytoplasmic antibody (ANCA) associated vasculitis (AAV), and to explore the disease activity of AAV patients and the relationship with prognosis. METHODS The clinical data of 46 cases of AAV patients in the First Affiliated Hospital of PLA General Hospital were analyzed retrospectively.The clinical and laboratory features of each clinical subtype were compared.The disease activity of AAV and the relationship between disease activity and prognosis were evaluated. RESULTS Among the 46 patients with AAV, 24 were male, and 22 were female, with the average age of 56±18.Among the subtypes of AAV, the number of granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA), and eosinophilic granulomatosis with polyangiitis (EGPA) were 22, 17 and 4 respectively, while the positive rate of ANCA are 72.7%, 88.2% and 50.0% respectively.For GPA, the results of ANCA were mainly C-ANCA or ANCA directed toward proteinase-3 (PR3), and for MPA, the results of ANCA were mainly P-ANCA or ANCA directed toward myeloperoxidase (MPO). Upper and lower respiratory disease, renal involvement and non-deformity arthropathy were the common clinical manifestations of all primary AAV subtypes.Epistaxis, nasal blood scab, saddle nose, pulmonary nodule and intrapulmonary cavities were the characteristic manifestations of GPA, while rapid progress of renal failure was prominent in MPA.Whatever their ANCA results, there were no significant differences between each other as to system-organ involvements and laboratory indexes.Seven patients (15.2%) died during hospitalization or in follow-up visits.Serious involvements of heart, lung, kidney, and complicated with infections were the main risk factors of death in AAV patients. CONCLUSIONS Upper and lower respiratory involvements and kidney diseases are the primary manifestations of AAV patients.ANCA results are irrelevant with disease activity and system-organ involvements.Serious involvements of heart, lung, kidney, and complicated with infections are the main risk factors of death in AAV patients.
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Affiliation(s)
- Q Zhang
- Department of Rheumatology, the First Affiliated Hospital of PLA General Hospital, Beijing 100048, China
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Yu SQ, Zhou HQ, Liu LJ. New intensive care unit and bacterial epidemiology. Indian J Med Microbiol 2015; 33:176. [DOI: 10.4103/0255-0857.148414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Zhang HX, Li SJ, Zhou HQ. Evaluating the annotation of protein-coding genes in bacterial genomes: Chloroflexus aurantiacus strain J-10-fl and Natrinema sp J7-2 as case studies. Genet Mol Res 2014; 13:10891-7. [PMID: 25526209 DOI: 10.4238/2014.december.19.10] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Gene annotation plays a key role in subsequent biochemical and molecular biological studies of various organisms. There are some errors in the original annotation of sequenced genomes because of the lack of sufficient data, and these errors may propagate into other genomes. Therefore, genome annotation must be checked from time to time to evaluate newly accumulated data. In this study, we evaluated the gene density of 2606 bacteria or archaea, and identified 2 with extreme values, the minimum value (Chloroflexus aurantiacus strain J-10-fl) and maximum value (Natrinema sp J7-2), to conduct genome re-annotation. In the genome of C. aurantiacus strain J-10-fl, we identified 17 new genes with definite functions and eliminated 34 non-coding open-reading frames; in the genome of Natrinema sp J7-2, we eliminated 118 non-coding open reading frames. Our re-annotation procedure may provide a reference for improving the annotation of other bacterial genomes.
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Affiliation(s)
- H X Zhang
- School of Life Science and Technology, Key Laboratory for Neuroinformation of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China
| | - S J Li
- School of Life Science and Technology, Key Laboratory for Neuroinformation of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China
| | - H Q Zhou
- School of Life Science and Technology, Key Laboratory for Neuroinformation of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China
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Hu CY, Chai XZ, Zhou HQ, Wang SF. Mutant prevention concentrations of fluoroquinolones against Helicobacter pylori. Shijie Huaren Xiaohua Zazhi 2010; 18:3347-3351. [DOI: 10.11569/wcjd.v18.i31.3347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To compare the mutant prevention concentrations (MPC) of four fluoroquinolones against fluoroquinolone-susceptible clinical Helicobacter pylori (H.pylori) isolates.
METHODS: Sixteen clinical isolates of H.pylori were enriched in broth and adjusted to 1010 colony-forming units per milliliter. The minimal inhibitory concentration (MIC) and provisional MPC (MPCpr) of moxifloxacin, gatifloxacin, levofloxacin and ciprofloxacin were determined using the agar plate dilution method. The 50% MIC (MIC50), 90% MIC (MIC90), and 90% provisional MPC (MPCpr90) for fluoroquinolone-susceptible H.pylori isolates were then calculated.
RESULTS: When the breakpoints for fluoroquinolone resistance were defined as >1.0 mg/L, there were 2, 1, 4 and 2 H.pylori strains resistant to moxifloxacin, gatifloxacin, levofloxacin and ciprofloxacin, respectively. The MIC50 of moxifloxacin, gatifloxacin, levofloxacin and ciprofloxacin for fluoroquinolone-susceptible H.pylori isolates were 0.13, 0.13, 0.25 and 0.50, respectively, while the MIC90 were 0.50, 0.50, 1.00 and 0.50 mg/L, respectively. The MPCpr90 of moxifloxacin, gatifloxacin, levofloxacin and ciprofloxacin were 8.0, 2.0, 8.0 and 2.0 mg/L, and the ratios of MPCpr90 to MIC90 were 16.0, 4.0, 8.0 and 4.0, respectively.
CONCLUSION: The anti-H.pylori activity of gatifloxacin and moxifloxacin might be stronger than that of levofloxacin and ciprofloxacin, and the capacity of gatifloxacin and ciprofloxacin restricting the selection of resistant mutants appears to be stronger than that of moxifloxacin and levofloxacin in the treatment of H.pylori infection.
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Zhou HQ, Zhang FC, Tian XP, Leng XM, Lu JJ, Zhao Y, Tang FL, Zhang X, Zeng XF, Zhang ZL, Zhang W, Dong Y. Clinical features and outcome of neuropsychiatric lupus in Chinese: analysis of 240 hospitalized patients. Lupus 2008; 17:93-9. [PMID: 18250131 DOI: 10.1177/0961203307085671] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Neuropsychiatric (NP) events are severe manifestations of systemic lupus erythematosus (SLE) and relate to poor outcome. The aims of this study are to investigate the NP manifestations of SLE and to identify the predictive factors for clinical outcome. There was a retrospective review of 240 hospital patients with primary NP events of SLE (NPSLE) from 1990 to 2004. Neuropsychiatric manifestations, SLE disease activity index (SLEDAI) score, System lupus International Collaborating Clinic/American College of Rheumatology Damage Index (SLICC/ACR-DI) score, magnetic resonance imaging (MRI) findings, treatment and mortality rate were included for analysis. From this group of patients, 15 NP syndromes were identified. The most frequent manifestation was headache, followed by seizure. The mean SLEDAI and SLICC/ACR-DI scores were 19.9 +/- 6.9 and 3.5 +/- 1.6, respectively. Abnormal MRI features were found in 67% (61/91) patients. At least one intrathecal (IT) injection of methotrexate (MTX) plus dexamethasone (DXM) was administered to 109 (45.4%) patients. High dose (1 g) intravenous methylprednisolone pulse therapy (IVMP) was administered to 167 (69.5%) patients. Multifactor analysis revealed that high SLICC/ACR-DI scores and sets of concurrent NP symptoms were independently associated with poor outcome, whereas pulse IVMP and IT injection of MTX plus DXM were protective factors against poor outcome. From our data, NPSLE is heterogeneous and is usually associated with high disease activity and organ damage scores. High SLICC/ACR-DI score and having more than two sets of NP symptoms are the predictors for poor outcome, whereas pulse IVMP and IT injection of MTX plus DXM can improve the prognosis.
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Affiliation(s)
- H Q Zhou
- Department of Rheumatology and Immunology, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
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Geng WR, Li N, Yu Q, Zhou HQ, Xu HM. Significance of Survivin expression and its correlation with Bcl-2 protein expression in colorectal carcinoma. Shijie Huaren Xiaohua Zazhi 2007; 15:305-309. [DOI: 10.11569/wcjd.v15.i3.305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To study the expression of Survivin and its correlation with expression of Bcl-2 protein in colorectal carcinoma.
METHODS: The expression of Survivin and Bcl-2 protein was evaluated by immunnohistochemistry in 52 case of colorectal carcinoma. The relationship between Survivin expression and clinical indexes as well as Bcl-2 expression was analyzed.
RESULTS: Survivin was expressed in 27 of 52 (51.9%) colorectal carcinoma cases. The expression of Survivin showed no correlation with the age, sex, tumor location, size, differentiation degree, pathologic types and lymph node metastasis (P > 0.05). The 5-year survival rate was lower in patients with high Survivin expression than that in those with low Survivin expression (52.94% vs 83.33%, P = 0.0304). There was no significant relationship between Survivin and Bcl-2 expression (P > 0.05).
CONCLUSION: Survivin expression may play a strong inhibitory role in the apoptosis of colorectal cancer cells, and the patients with high Survivin expression have an unfavorable prognosis. No correlation is found between Survivin and Bcl-2 expression.
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Zhou HQ, Chen G, Lu XG, Ye XW. [Detection of plasma urokinase-type plasminogen activator and its receptor in acute or chronic hepatitis B patients and its clinical significance.]. Zhonghua Shi Yan He Lin Chuang Bing Du Xue Za Zhi 2006; 20:238-40. [PMID: 17086281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
BACKGROUND To study the expression of plasma uPA and uPAR in Acute or Chronic Hepatitis B patients, to investigate changes of blood fibrinolytic system in Hepatitis B and its clinical significance. METHODS The level of detected plasma urokinase-type plasminogen activator (uPA) and urokinase-type plasminogen activator receptor (uPAR) were measured by Enzyme Linked Immuno Sorbent Assay (ELISA). RESULTS The levels of plasma uPA and uPAR were significantly higher in patients with Acute or Chronic Hepatitis B than that of control group (P less than 0.05, P less than 0.01), and also higher in serious group than that of non-serious group of Chronic Hepatitis B patients (P less than 0.05), and also higher in chronic group than in acute group (P less than 0.05). The level of plasma uPAR was significantly higher in patients with serious jaundice than that of non-serious jaundice group (P less than 0.01). The levels of uPA and uPAR are significantly higher in acute period than that in recover period of Acute Hepatitis B patients, but the levels in recover period is also higher than that in control group. The level of plasma uPAR have positive correlation with prothrombin (PT), international normalized ratio (INR) and total bilirubin (P less than 0.01). CONCLUSION The level of plasma UPA nad UPAR were enhanced in Acute or Chronic Hepatitis B patients was related with the degree of inflammation, was also related with high expression of serious damage of liver cell. It may be one of important cause to imbalance between coagulation and fibrinolytic in hepatitis.
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Affiliation(s)
- H Q Zhou
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou 310013, China
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Han Y, Xu YJ, Yu Q, Yang M, Zhao M, Zhou HQ. Expression of Survivin protein and measurements of stereology parameters in esophageal squamous carcinoma. Shijie Huaren Xiaohua Zazhi 2006; 14:2315-2318. [DOI: 10.11569/wcjd.v14.i23.2315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the expression of Survivin in esophageal squamous carcinomas (ESC) and measure the stereology parameters of ESC cells.
METHODS: SP immunohistochemistry was used to detect the expression of Survivin protein in 52 ESC patients. Thirty Survivin-positive ESC cells were measured with image analyze system under microscope. The data for the stereological analysis include the body density of nucleus (Vvn), the surface area density of nucleus (Svn), the mean volume of nucleus (V), the surface area of nucleus (S), the mean free path of nucleus (λ), the number density of nucleus (Nv), and the mean curvature density of nucleus (Kv). The differences of the parameters were compared among the tumors with different degrees.
RESULTS: The positive rate of Survivin protein was 57.7% in ESC, and up-regulated expression of Survivin was strongly associated with poor differentiation (χ2 = 6.1099, P = 0.0471). The values of Vvn, Svn, V and S were increased, but those of Kv, Nv, and λ were decreased ordinally in well, moderately and poorly differentiated tumor cells, of which the values of Vvn (F = 3.8368, P = 0.0342) and Svn (F = 3.7143, P = 0.0376) had significant differences (P < 0.05).
CONCLUSION: The expression of Survivin protein is correlated with the differentiation in ESC. Vvn and Svn were important indexes of cellular abnormity, which provides evidences for clinical morphological diagnosis.
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Dakoji S, Li D, Agnihotri G, Zhou HQ, Liu HW. Studies on the inactivation of bovine liver enoyl-CoA hydratase by (methylenecyclopropyl)formyl-CoA: elucidation of the inactivation mechanism and identification of cysteine-114 as the entrapped nucleophile. J Am Chem Soc 2001; 123:9749-59. [PMID: 11583536 DOI: 10.1021/ja011226k] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The inhibitory properties of (methylenecyclopropyl)formyl-CoA (MCPF-CoA), a metabolite derived from a natural amino acid, (methylenecyclopropyl)glycine, against bovine liver enoyl-CoA hydratase (ECH) were characterized. We have previously demonstrated that MCPF-CoA specifically targets ECHs, which catalyze the reversible hydration of alpha,beta-unsaturated enoyl-CoA substrates to the corresponding beta-hydroxyacyl-CoA products. Here, we synthesized (R)- and (S)-diastereomers of MCPF-CoA to examine the stereoselectivity of this inactivation. Both compounds were shown to be competent inhibitors for bovine liver ECH with nearly identical second-order inactivation rate constants (k(inact)/K(I)) and partition ratios (k(cat)/k(inact)), indicating that the inactivation is nonstereospecific with respect to ring cleavage. The inhibitor, upon incubation with bovine liver ECH, labels a tryptic peptide, ALGGGXEL, near the active site of the protein, where X is the amino acid that is covalently modified. Cloning and sequence analysis of bovine liver ECH gene revealed the identity of the amino acid residue entrapped by MCPF-CoA as Cys-114 (mature sequence numbering). On the basis of gHMQC (gradient heteronuclear multiple quantum coherence) analysis with [3-(13)C]-labeled MCPF-CoA, the ring cleavage is most likely induced by the nucleophilic attack at the terminal carbon of the exomethylene group (C(2)'). We propose a plausible inactivation mechanism that involves relief of ring strain and is consistent with examples found in the literature. In addition, these studies provide important clues for future design of more efficient and selective inhibitors to control and/or regulate fatty acid metabolism.
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Affiliation(s)
- S Dakoji
- Division of Medicinal Chemistry, College of Pharmacy, University of Texas, Austin, 78712, USA
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Abstract
The one-dimensional Hubbard model is integrable in the sense that it has an infinite family of conserved currents. We explicitly construct a ladder operator which can be used to iteratively generate all of the conserved current operators. This construction is different from that used for Lorentz invariant systems such as the Heisenberg model. The Hubbard model is not Lorentz invariant, due to the separation of spin and charge excitations. The ladder operator is obtained by a very general formalism which is applicable to any model that can be derived from a solution of the Yang-Baxter equation.
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Affiliation(s)
- J Links
- Centre for Mathematical Physics, School of Physical Sciences, The University of Queensland, Brisbane 4072, Australia
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Wei H, Mei YA, Wu MM, Sun JT, Zhou HQ, Zhang ZH. Swelling-activated chloride currents in embryonic chick heart cells. Acta Pharmacol Sin 2000; 21:986-90. [PMID: 11501066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
AIM To characterize a swelling-activated chloride current, I(Cl, swell), in white Leghorn chick heart cells and the effects of chlorpromazine (CPZ) effects. METHODS The patch-clamp technique in the whole-cell configuration was used. RESULTS Hyposmotic swelling elicited I(Cl, swell) in white Leghorn chick heart cells. The current amplitude increased from (452 +/- 200) pA to (849 +/- 373) pA with a reduction of osmolarity from 300 mmol.L-1 to 270 mmol.L-1, 4',4-Diisothiocyanostilbene-2,2'-disulphonic acid (DIDS) 100 mumol.L-1 decreased I(Cl, swell) from (1196 +/- 505) pA to (830 +/- 328) pA in hyposmotic solution. In white Leghorn chick heart cells I(Cl, swell) was not induced by CPZ 30 mumol.L-1, which is different from the case of E coli spheroplast. CONCLUSION Swelling-activated chloride current was activated by hyposmotic swelling in white Leghorn chick heart cells. The mechanism for activating the current is different from that of mechanosensitive ion channels of E coli.
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Affiliation(s)
- H Wei
- Department of Physiology and Biophysics, Liren Laboratory, Fudan University, Shanghai 200433, China
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Mei YA, Wu MM, Huan CL, Sun JT, Zhou HQ, Zhang ZH. 4-aminopyridine, a specific blocker of K(+) channels, inhibited inward Na(+) current in rat cerebellar granule cells. Brain Res 2000; 873:46-53. [PMID: 10915809 DOI: 10.1016/s0006-8993(00)02469-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of 4-aminopyridine (4-AP), a specific blocker of outward K(+) current, on voltage-activated transient outward K(+) current (I(K(A))) and inward Na(+) current (I(Na)) were investigated on cultured rat cerebellar granule cells using the whole cell voltage-clamp technique. At the concentration of 1-5 mM, 4-AP inhibited both I(K(A)) and I(Na). It reduced the amplitude of peak Na(+) current without significant alteration of the steady-state activation and inactivation properties. The inhibitory effect was not enhanced by repeated depolarizing pulses (0.5 or 0.1 Hz), suggesting that the binding affinity of 4-AP on Na(+) channels is state-independent. In contrast, the effect of 4-AP on Na(+) channels appeared to be voltage-dependent, the weaker inhibition occurred at more depolarization. Moreover, 4-AP slowed both the activation and inactivation kinetics of Na(+) current. These effects were similar to those induced by alpha-scorpion toxin and sea anemone toxins on Na(+) channels in other cell model. Our data demonstrate for the first time that 4-AP is able to block not only A-type K(+) channels, but also Na(+) channels in rat cerebellar granule cells. It is concluded that the inhibition exerted by 4-AP on Na(+) current likely differs from that provoked by local anesthetics. The possibility that the binding site of neurotoxin receptor 3 may be involved is discussed.
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Affiliation(s)
- Y A Mei
- Center for brain science research and Liren laboratory, School of Life Sciences, Fudan University, Shanghai, PR China.
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Hu XJ, Peng F, Zhou HQ, Zhang ZH, Cheng WY, Feng HF. The abnormality of glucose transporter in the erythrocyte membrane of Chinese type 2 diabetic patients. Biochim Biophys Acta 2000; 1466:306-14. [PMID: 10825451 DOI: 10.1016/s0005-2736(00)00175-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Type 2 diabetes mellitus is characterized by impaired glucose uptake. With a photometric method of recording the erythrocyte suspension absorption during the course of glucose transport across the membranes, we observed that the initial rate of glucose zero-trans entry was decreased significantly in 30 Chinese type 2 diabetic patients as compared to 25 healthy controls. The rate of glucose infinite-cis efflux exhibited no difference between the patients and controls. The measurement of temperature dependence of glucose transport showed that the activation energy for glucose entry was increased in diabetic patients. The inhibitory constant of glucose entry by cytochalasin B (CB) in patients was similar to that of the controls. However, we found that the inhibitory constant was increased significantly in the patient erythrocytes after phloretin treatment. After the erythrocytes were made into stripped white ghosts, the fluorescence quenching experiment was performed. Glucose, CB and phloretin can quench the fluorescence of tryptophan residues in the glucose transporter 1, GLUT1. The abnormality of fluorescence quenching in the erythrocyte membranes of patients was observed. The transfer tendency of tryptophan residues from the hydrophilic environment to the hydrophobic environment was decreased in patient ghosts as binding with glucose, and the opposite tendency appeared as CB and phloretin instead of glucose. We conclude that the decreased in glucose entry in the erythrocyte membranes of diabetic patients was due to the GLUT1 change in structure - mostly the outer domain of the glucose transporter.
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Affiliation(s)
- X J Hu
- Department of Physiology and Biophysics, Liren Laboratory, Fudan University, Shanghai, China
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Mei YA, Huang LX, Wei H, Sun JT, Zhou HQ, Zhang ZH. Characterization of outward potassium current in embryonic chick heart cells. Zhongguo Yao Li Xue Bao 1999; 20:303-7. [PMID: 10452113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
AIM To characterize a voltage-dependent outward K+ current in cultured heart cells of 14-16-day-old embryos of yellow chick. METHODS The patchclamp technique in the whole-cell configuration was used. RESULTS The kinetics and the pharmacology of the outward K+ current in our cell mold were different from those described in white chick. Like the calcium-activated K+ current, blocker of calcium channel, CdCl2, eliminated the current of more than 95%. Isoproterenol provoked an increase of peak amplitude (137% +/- 47%, n = 16 cells) and acceleration of activation kinetics in the outward K+ current (the time reaching a peak current reduced from 36 ms +/- 10 ms to 16 ms +/- 9 ms). This effect of isoproterenol was mimiced by cAMP. In addition, a frequency-dependent decrease in peak amplitude of the current occurred after cAMP-induced phosphorylation. CONCLUSION There are species- and/or cell-type-specific difference in the K+ channels properties. In embryonic yellow chick heart cells, the phospholation of channel could not only modulate the activation kinetic properties of the calcium-activated potassium channel, but also change their recovery kinetics.
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Affiliation(s)
- Y A Mei
- Department of Physiology and Biophysics, Liren Laboratory, Fudan University, Shanghai, China.
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Zhou HQ, Tang JG. Further results for infinite conservation laws in the one-dimensional Hubbard model. Phys Rev B Condens Matter 1988; 38:11915-11917. [PMID: 9946101 DOI: 10.1103/physrevb.38.11915] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Hu YF, Zhang H, Zhang HD, Shao AH, Li LX, Zhou HQ, Zhao BH, Zhou YG. Culture of human fetal pancreas and islet transplantation in 24 patients with type 1 diabetes mellitus. Chin Med J (Engl) 1985; 98:236-43. [PMID: 3924517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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