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Luo YX, Yang LL, Yao XQ. Gut microbiota-host lipid crosstalk in Alzheimer's disease: implications for disease progression and therapeutics. Mol Neurodegener 2024; 19:35. [PMID: 38627829 PMCID: PMC11020986 DOI: 10.1186/s13024-024-00720-0] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 03/18/2024] [Indexed: 04/19/2024] Open
Abstract
Trillions of intestinal bacteria in the human body undergo dynamic transformations in response to physiological and pathological changes. Alterations in their composition and metabolites collectively contribute to the progression of Alzheimer's disease. The role of gut microbiota in Alzheimer's disease is diverse and complex, evidence suggests lipid metabolism may be one of the potential pathways. However, the mechanisms that gut microbiota mediate lipid metabolism in Alzheimer's disease pathology remain unclear, necessitating further investigation for clarification. This review highlights the current understanding of how gut microbiota disrupts lipid metabolism and discusses the implications of these discoveries in guiding strategies for the prevention or treatment of Alzheimer's disease based on existing data.
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Affiliation(s)
- Ya-Xi Luo
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ling-Ling Yang
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
- Chongqing Municipality Clinical Research Center for Geriatric Medicine, Chongqing, China.
- Department of Rehabilitation Therapy, Chongqing Medical University, Chongqing, China.
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2
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Zhu YH, Hu P, Luo YX, Yao XQ. Knowledge mapping of trends and hotspots in the field of exercise and cognition research over the past decade. Aging Clin Exp Res 2024; 36:19. [PMID: 38308660 PMCID: PMC10838253 DOI: 10.1007/s40520-023-02661-y] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 11/09/2023] [Indexed: 02/05/2024]
Abstract
Exercise elicits a wide range of physiological responses in mammalian tissues that enhance a broad range of functions, particularly in improving cognitive performance. However, the field lacks a comprehensive bibliometric analysis that clarifies its knowledge structure and research hotspots. This study aims to address this gap and map the research landscape regarding the role of exercise in cognitive function enhancement. Firstly, the frequencies and co-occurrence of keywords were analysed to identify six main clusters: aging, cognitive impairment, rehabilitation, obesity, fatigue, and hippocampus. Secondly, reference timeline co-citation analysis revealed that hippocampus and aging were the major bursts with high intensity and long attention span while children had recently emerged as a topical subject. Finally, the evolution of themes from 2012 to 2022 was analysed, and found that older adults had been the leading research theme for exercise affecting cognition. Childhood obesity was an emerging theme that attracted increasing research attention in recent years while the hippocampus research theme expanded rapidly during the decade but remained a niche topic with less relevance to others. This research identified and summarised research priorities and evolutionary trends in exercise to improve cognition by constructing knowledge networks through visual analysis. It provides researchers with a comprehensive insight into the current state of the field to facilitate further research.
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Affiliation(s)
- Ying-Hai Zhu
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Peng Hu
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ya-Xi Luo
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
| | - Xiu-Qing Yao
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
- Chongqing Municipality Clinical Research Center for Geriatric Medicine, Chongqing, China.
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Luo YX, Zhu YH, Yao XQ. Knowledge mapping of exercise and physical activity research in older adults: Hotspots, bursts, and trends of the last decade. Heliyon 2023; 9:e23181. [PMID: 38149200 PMCID: PMC10750044 DOI: 10.1016/j.heliyon.2023.e23181] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 11/28/2023] [Accepted: 11/28/2023] [Indexed: 12/28/2023] Open
Abstract
Background and objectives Global aging has increased the importance of health management in older adults. Exercise is a crucial strategy for healthy aging and has led to numerous scientific advancements due to its impact on age-related illnesses. We aim to investigate the research hotspots, bursts of knowledge base, and trends in the field of exercise and physical activity in older adults over the past decade and present them in a visual manner. Methods We searched and retrieved data from the Web of Science database, and performed a bibliometric analysis of publications on exercise and physical activity research in older adults from 2013 to 2022. We evaluated the current status and hotspots through co-occurrence analysis using VOSviewer. The evolution and bursts of knowledge base were assessed through co-citation analysis using CiteSpace. Thematic evolution was analyzed using the bibliometrix package to discover keyword trends. The attribution and collaboration of countries/regions, institutions and authors were also analyzed. Results A total of 27,820 publications were included. Publications on exercise and physical activity in older adults increased from 1755 records in 2013-3737 records in 2022 annually. In co-occurrence analysis of keywords, 5 major clusters were revealed: sarcopenia, cognition, frailty, mental health, and rehabilitation. Co-citation analysis reveals that the knowledge base has evolved from references focused on frailty, dementia, and physical activity before 2016 to references focus on sarcopenia, cognition and sedentary behavior after 2020. Among the top 10 high-frequency keywords, sarcopenia demonstrated a consistent and significant upward trend, with its percentage increasing from 8.7 % (82 times) in 2016 to 12.2 % (236 times) in the most recent year, making it the most frequently used keyword. Frailty ranked second, starting at 5.6 % (41 times) in 2013 and gradually rising to 11.7 % (225 times) in 2022. The most productive country, institution and author were the USA (8212 publications), the University of Pittsburgh(501 publications), and Brendon Stubbs(94 publications), respectively. Discussion Publications on exercise and physical activity for older adults have surged in the last decade, accompanied by a shift in the knowledge base. Regional disparities in the academic output in this field need to be addressed in the future to promote healthy aging.
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Affiliation(s)
- Ya-Xi Luo
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Ying-Hai Zhu
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
- Chongqing Municipality Clinical Research Center for Geriatric Medicine, Chongqing, China
- Department of Rehabilitation Therapy, Chongqing Medical University, Chongqing, China
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Sun HL, Yao XQ, Lei L, Jin WS, Bai YD, Zeng GH, Shi AY, Liang J, Zhu L, Liu YH, Wang YJ, Bu XL. Associations of Blood and Cerebrospinal Fluid Aβ and tau Levels with Renal Function. Mol Neurobiol 2023; 60:5343-5351. [PMID: 37310581 DOI: 10.1007/s12035-023-03420-w] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 05/25/2023] [Indexed: 06/14/2023]
Abstract
Amyloid β (Aβ) and tau play pivotal roles in the pathogenesis of Alzheimer's disease (AD). Previous studies have shown that brain-derived Aβ and tau can be cleared through transport into the periphery, and the kidneys may be vital organs involved in the clearance of Aβ and tau. However, the effects of deficiency in the clearance of Aβ and tau by the kidneys on brain AD-type pathologies in humans remain largely unknown. In this study, we first recruited 41 patients with chronic kidney disease (CKD) and 40 age- and sex-matched controls with normal renal function to analyze the associations of the estimated glomerular filtration rate (eGFR) with plasma Aβ and tau levels. To analyze the associations of eGFR with cerebrospinal fluid (CSF) AD biomarkers, we recruited 42 cognitively normal CKD patients and 150 cognitively normal controls with CSF samples. Compared with controls with normal renal function, CKD patients had higher plasma levels of Aβ40, Aβ42 and total tau (T-tau), lower CSF levels of Aβ40 and Aβ42 and higher levels of CSF T-tau/Aβ42 and phosphorylated tau (P-tau)/Aβ42. Plasma Aβ40, Aβ42, and T-tau levels were negatively correlated with eGFR. In addition, eGFR was negatively correlated with CSF levels of T-tau, T-tau/Aβ42, and P-tau/Aβ42 but positively correlated with Mini-Mental State Examination (MMSE) scores. Thus, this study showed that the decline in renal function was correlated with abnormal AD biomarkers and cognitive decline, which provides human evidence that renal function may be involved in the pathogenesis of AD.
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Affiliation(s)
- Hao-Lun Sun
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse, China
| | - Xiu-Qing Yao
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Li Lei
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
| | - Wang-Sheng Jin
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
| | - Yu-Di Bai
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
| | - Gui-Hua Zeng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
| | - An-Yu Shi
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
| | - Jun Liang
- Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse, China
| | - Li Zhu
- Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse, China
| | - Yu-Hui Liu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China
- Institute of Brain and Intelligence, Third Military Medical University, Chongqing, China
- State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China.
- Institute of Brain and Intelligence, Third Military Medical University, Chongqing, China.
- State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China.
- Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.
| | - Xian-Le Bu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.
- Chongqing Key Laboratory of Ageing and Brain Diseases, Chongqing, China.
- Institute of Brain and Intelligence, Third Military Medical University, Chongqing, China.
- State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University, Chongqing, China.
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Wang YR, Liang CR, Heng T, Zhang T, Hu XT, Long Y, Huang L, Dong B, Gao X, Deng J, Xu X, Yao XQ. Circulating antibodies to Helicobacter pylori are associated with biomarkers of neurodegeneration in cognitively intact adults. Asian J Psychiatr 2023; 86:103680. [PMID: 37352754 DOI: 10.1016/j.ajp.2023.103680] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/13/2023] [Accepted: 06/17/2023] [Indexed: 06/25/2023]
Abstract
Helicobacter pylori (H. pylori) infection confers risk for Alzheimer's Disease (AD), with the mechanisms unknown. Infections are linked to the etiology of AD partly through modulating the humoral immunity post-infection. This study found increased plasma levels of tTau and pTau181 in H. Pylori infected individuals with intact cognition. Plasma antibodies to H. pylori were positively associated with Aβ40, Aβ42, tTau, and pTau181, adjusting for age, sex, education level, BMI, ApoE ε4 genotype, hypertension, diabetes mellitus, and hypercholesteremia. This study presents novel insights into the relationship between H. pylori infection and AD from an autoimmune perspective.
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Affiliation(s)
- Ye-Ran Wang
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Chun-Rong Liang
- Department of Sleep and Psychology, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Tian Heng
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China
| | - Ting Zhang
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Xiao-Tong Hu
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Yan Long
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Liang Huang
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Bo Dong
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Xia Gao
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Juan Deng
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China
| | - Xia Xu
- Center of Health Management, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing 400042, China.
| | - Xiu-Qing Yao
- Department of Rehabilitation, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China.
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Jian JM, Fan DY, Tian DY, Cheng Y, Sun PY, Tan CR, Zeng GH, He CY, Wang YR, Zhu J, Yao XQ, Wang YJ, Liu YH. Naturally-Occurring Antibodies Against Bim are Decreased in Alzheimer's Disease and Attenuate AD-type Pathology in a Mouse Model. Neurosci Bull 2022; 38:1025-1040. [PMID: 35570231 PMCID: PMC9468199 DOI: 10.1007/s12264-022-00869-y] [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: 10/08/2021] [Accepted: 02/13/2022] [Indexed: 10/18/2022] Open
Abstract
Increased neuronal apoptosis is an important pathological feature of Alzheimer's disease (AD). The Bcl-2-interacting mediator of cell death (Bim) mediates amyloid-beta (Aβ)-induced neuronal apoptosis. Naturally-occurring antibodies against Bim (NAbs-Bim) exist in human blood, with their levels and functions unknown in AD. In this study, we found that circulating NAbs-Bim were decreased in AD patients. Plasma levels of NAbs-Bim were negatively associated with brain amyloid burden and positively associated with cognitive functions. Furthermore, NAbs-Bim purified from intravenous immunoglobulin rescued the behavioral deficits and ameliorated Aβ deposition, tau hyperphosphorylation, microgliosis, and neuronal apoptosis in APP/PS1 mice. In vitro investigations demonstrated that NAbs-Bim were neuroprotective against AD through neutralizing Bim-directed neuronal apoptosis and the amyloidogenic processing of amyloid precursor protein. These findings indicate that the decrease of NAbs-Bim might contribute to the pathogenesis of AD and immunotherapies targeting Bim hold promise for the treatment of AD.
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Affiliation(s)
- Jie-Ming Jian
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Dong-Yu Fan
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
- Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse, 857000, China
| | - Ding-Yuan Tian
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Yuan Cheng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Pu-Yang Sun
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Cheng-Rong Tan
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Gui-Hua Zeng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Chen-Yang He
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Ye-Ran Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Jie Zhu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China
| | - Xiu-Qing Yao
- Department of Rehabilitation, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400000, China
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China.
- Key Laboratory of Ageing and Brain Disease, Chongqing, 400000, China.
- Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, 200031, China.
| | - Yu-Hui Liu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400000, China.
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Liang WJ, Wu DQ, Lyu ZJ, Hu WX, Wang JJ, Zheng JB, Yan Q, Wu WL, Cai GF, Yao XQ, Li Y. [Application of indocyanine green fluorescence proctoscope in rectal cancer surgery]. Zhonghua Wei Chang Wai Ke Za Zhi 2020; 23:1104-1105. [PMID: 33212561 DOI: 10.3760/cma.j.cn.441530-20191030-00466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Sun BL, Li WW, Wang J, Xu YL, Sun HL, Tian DY, Wang YJ, Yao XQ. Gut Microbiota Alteration and Its Time Course in a Tauopathy Mouse Model. J Alzheimers Dis 2020; 70:399-412. [PMID: 31177213 DOI: 10.3233/jad-181220] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Emerging evidence suggests that gut microbiota dysbiosis plays a role in neurodegenerative disorders. However, whether the composition and diversity of the gut microbiota are altered in tauopathies remains largely unknown. This study was aimed to examine the diversity and composition of the gut microbiota in tauopathies, as well as the correlation with pathological changes in the brain. We collected fecal samples from 32 P301L tau transgenic mice and 32 age- and gender-matched littermate mice at different ages. The 16S ribosomal RNA sequencing technique was used to analyze the microbiota composition in feces. Brain tau pathology levels were measured by immunohistochemistry. The diversity and composition of the gut microbiota significantly changed with aging. At the phylum level, the relative abundance of Bacteroidetes was increased, while Firmicutes were decreased in P301L mice compared with that in Wt mice after 3 months of age. In addition, Actinobacteria was decreased in P301L mice at 3 and 6 months of age, meanwhile Tenericutes was decreased in P301L mice at 10 months of age. Moreover, several specific macrobiota were highly associated with the levels of AT8-tau or pT231-tau protein in the brain. Our findings suggest that gut microbiota changed with aging, as well as in the tauopathy mice model. Modulation of the gut microbiota may be a potential strategy for treatment of tauopathy.
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Affiliation(s)
- Bin-Lu Sun
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Wei-Wei Li
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jun Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ya-Li Xu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Hao-Lun Sun
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ding-Yuan Tian
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.,State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University, Chongqing, China.,Centre for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Science, Beijing, China
| | - Xiu-Qing Yao
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
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Li WW, Shen YY, Tian DY, Bu XL, Zeng F, Liu YH, Chen Y, Yao XQ, Li HY, Chen DW, Zhou FY, Yang H, Li QM, Bao WQ, Guan YH, Zhou HD, Jin RB, Wang YJ. Brain Amyloid-β Deposition and Blood Biomarkers in Patients with Clinically Diagnosed Alzheimer's Disease. J Alzheimers Dis 2020; 69:169-178. [PMID: 30958377 DOI: 10.3233/jad-190056] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Brain amyloid-β (Aβ) deposition is a hallmark to define Alzheimer's disease (AD). We investigated the positive rate of brain amyloid deposition assessed with 11C-Pittsburgh compound (PiB)-PET and blood Aβ levels in a cohort of probable AD patients who were diagnosed according to the 1984 NINCDS-ADRDA criteria. Eighty-four subjects with a clinical diagnosis of probable AD dementia, amnestic mild cognitive impairment (MCI), and cognitively normal (CN) status were subjected to PiB-PET and 18F-fluorodeoxyglucose (FDG)-PET scans. Plasma biomarkers of Aβ42, Aβ40, and T-tau were measured using single molecule array technology. The positive rate of PiB-PET, the associations between PiB-PET status and FDG-PET, plasma biomarkers, and clinical manifestations were analyzed. PiB-PET was positive in 77.36% of probable AD patients, 31.80% of MCI patients, and 0 of NC. Plasma Aβ42/Aβ40 ratio was associated with PiB-PET, the ROC curve analysis revealing an AUC of 0.77 (95% CI: 0.66-0.87), with a sensitivity of 82% and specificity of 64%. Some clinical manifestations were associated with PiB-PET imaging. Our findings indicate that only three-fourths of patients diagnosed with probable AD fit the pathological criteria, suggesting that we should be cautious regarding the accuracy of AD diagnosis when no biomarker evidence is available in our clinical practice.
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Affiliation(s)
- Wei-Wei Li
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ying-Ying Shen
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ding-Yuan Tian
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xian-Le Bu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Fan Zeng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yu-Hui Liu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yang Chen
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Hui-Yun Li
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Dong-Wan Chen
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Fa-Ying Zhou
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Heng Yang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Qi-Ming Li
- Department of Nuclear Medicine, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Wei-Qi Bao
- PET Center, Huashan Hospital, Fudan University, Shanghai, China
| | - Yi-Hui Guan
- PET Center, Huashan Hospital, Fudan University, Shanghai, China
| | - Hua-Dong Zhou
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Rong-Bing Jin
- Department of Nuclear Medicine, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, China.,State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University, Chongqing, China.,Centre for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Science, Shanghai, China
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10
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Lyu ZJ, Liang WJ, Wu DQ, Hu WX, Wang JJ, Zheng JB, Yan Q, Wu WL, Cai GF, Yao XQ, Li Y. [Safety and feasibility of indocyanine green injection through accessory incision in laparoscopic right hemicolectomy]. Zhonghua Wei Chang Wai Ke Za Zhi 2020; 23:791-794. [PMID: 32810952 DOI: 10.3760/cma.j.cn.441530-20190715-00274] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Objective: To explore the safety and feasibility of indocyanine green (ICG) injection through accessory incision in laparoscopic right hemicolectomy. Methods: A descriptive case series study was carried out. Clinicopathological data of 29 patients with colon cancer undergoing right hemicolectomy at Department of General Surgery, Guangdong Provincial People's Hospital were retrospectively analyzed. All the patients received ICG injection through accessory incision at the beginning of operation. Results: Among 29 patients, 13 were male and 16 were female with a mean age of (60.8±7.7) years and mean body mass index of (24.3±2.8) kg/m(2); 3 were stage I, 19 were stage II, 7 were stage III. Pericolic, intermediate and main lymph nodes could be detected under near infrared fluorescence imaging (NIRFI) in all the cases. No.6 lymph nodes were observed in 3 cases, while no lymph nodes around superior mesenteric vein (SMV) were found. The average number of fluorescent lymph node was 14.2±6.1. The average developing time of fluorescence was (36.2±3.7) minutes. The average number of harvested lymph nodes was 22.4±8.2. There was no extravasation of imaging agent during the operation, and there were no intraoperative complications such as allergies, massive abdominal bleeding, peripheral organ damage, etc. Operative time was (113.1±10.7) minutes, blood loss during operation was (22.4±3.9) ml, ambulatory time was (1.2±0.4) days, time to the first flatus was (1.7±0.7) days, time to the first fluid diet was (0.7±0.4) days, and postoperative hospital stay was (5.8±1.5) days. No operation-associated complications such as anastomotic bleeding, anastomotic leakage, peritoneal bleeding, peritoneal infection, incision infection occurred after operation. Conclusion: ICG injection through accessory incision in laparoscopic right hemicolectomy is safe and feasible.
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Affiliation(s)
- Z J Lyu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - W J Liang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - D Q Wu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - W X Hu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - J J Wang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - J B Zheng
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - Q Yan
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - W L Wu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - G F Cai
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - X Q Yao
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - Y Li
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
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11
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Lyu ZJ, Liang WJ, Lin ZB, Zhang GR, Wu DQ, Luo YW, Yan Q, Cai GF, Yao XQ, Li Y. [Current practice patterns of preoperative bowel preparation in elective colorectal surgery: a nation-wide survey of Chinese surgeons]. Zhonghua Wei Chang Wai Ke Za Zhi 2020; 23:578-583. [PMID: 32521978 DOI: 10.3760/cma.j.cn.441530-20190611-00238] [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: To understand the current practice of preoperative bowel preparation in elective colorectal surgery in China. Methods: A cross-sectional questionnaire survey was conducted through wechat. The content of the questionnaire survey included professional title of the participants, the hospital class, dietary preparation and protocol, oral laxatives and specific types, oral antibiotics, gastric intubation, and mechanical enema before elective colorectal surgery. A stratified analysis based on hospital class was conducted to understand their current practice of preoperative bowel preparation in elective colorectal surgery. Result: A total of 600 questionnaires were issued, and 516 (86.00%) questionnaires of participants from different hospitals, engaged in colorectal surgery or general surgeons were recovered, of which 366 were from tertiary hospitals (70.93%) and 150 from secondary hospitals (29.07%). For diet preparation, the proportions of right hemicolic, left hemicolic and rectal surgery were 81.59% (421/516), 84.88% (438/516) and 84.88% (438/516) respectively. The average time of preoperative dietary preparation was 2.03 days. The study showed that 85.85% (443/516) of surgeons chose oral laxatives for bowel preparation in all colorectal surgery, while only 4.26% (22/516) of surgeons did not choose oral laxatives. For mechanical enema, the proportions of right hemicolic, left hemicolic and rectal surgery were 19.19% (99/516), 30.04% (155/516) and 32.75% (169/516) respectively. Preoperative oral antibiotics was used by 34.69% (179/516) of the respondents. 94.38% (487/516) of participants were satisfied with bowel preparation, and 55.43% (286/516) of participants believed that preoperative bowel preparation was well tolerated. In terms of preoperative oral laxatives, there was no statistically significant difference between different levels of hospitals [secondary hospitals vs. tertiary hospitals: 90.00% (135/150) vs. 84.15% (308/366), χ(2)=2.995, P=0.084]. Compared with the tertiary hospitals, the surgeons in the secondary hospitals accounted for higher proportions in diet preparation [87.33% (131/150) vs. 76.78% (281/366), χ(2)=7.369, P=0.007], gastric intubation [54.00% (81/150) vs. 36.33% (133/366), χ(2)=13.672, P<0.001], preoperative oral antibiotics [58.67% (88/150) vs. 24.86% (91/366), χ(2)=12.259, P<0.001] and enema [28.67% (43/150) vs. 15.30% (56/366), χ(2)=53.661, P<0.001]. Conclusion: Although the preoperative bowel preparation practice in elective colorectal surgery for most of surgeons in China is basically the same as the current international protocol, the proportions of mechanical enema and gastric intubation before surgery are still relatively high.
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Affiliation(s)
- Z J Lyu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - W J Liang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China; Medical College of Shantou University, Shantou, Guangdong 515000, China
| | - Z B Lin
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - G R Zhang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - D Q Wu
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - Y W Luo
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - Q Yan
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - G F Cai
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - X Q Yao
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
| | - Y Li
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510060, China
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12
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Shen LL, Li WW, Xu YL, Gao SH, Xu MY, Bu XL, Liu YH, Wang J, Zhu J, Zeng F, Yao XQ, Gao CY, Xu ZQ, Zhou XF, Wang YJ. Neurotrophin receptor p75 mediates amyloid β-induced tau pathology. Neurobiol Dis 2019; 132:104567. [PMID: 31394202 DOI: 10.1016/j.nbd.2019.104567] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 03/02/2019] [Revised: 06/10/2019] [Accepted: 08/02/2019] [Indexed: 01/05/2023] Open
Abstract
Neurofibrillary tangles of hyperphosphorylated tau protein (p-tau) are a key pathological feature of Alzheimer's disease (AD). Tau phosphorylation is suggested to be secondary to amyloid-beta (Aβ) accumulation. However, the mechanism by which Aβ induces tau phosphorylation in neurons remains unclear. Neurotrophin receptor p75 (p75NTR) is a receptor for Aβ and mediates Aβ neurotoxicity, implying that p75NTR may mediate Aβ-induced tau phosphorylation in AD. Here, we showed that Aβ-induced tau hyperphosphorylation and neurodegeneration, including tau phosphorylation, synaptic disorder and neuronal loss, in the brains of both male wild-type (Wt) mice and male P301L transgenic mice (a mouse model of human tauopathy) were alleviated by genetic knockout of p75NTR in the both mouse models. We further confirmed that the activation or inhibition of cyclin-dependent kinase 5 (CDK5) and glycogen synthase kinase-3β (GSK3β) significantly changed Aβ/p75NTR-mediated p-tau levels in neurons. Treatment of male P301L mice with soluble p75NTR extracellular domain (p75ECD-Fc), which antagonizes the binding of Aβ to p75NTR, suppressed tau hyperphosphorylation. Taken together, our findings suggest that p75NTR meditates Aβ-induced tau pathology and is a potential druggable target for AD and other tauopathies.
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Affiliation(s)
- Lin-Lin Shen
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China; Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse 857000, China
| | - Wei-Wei Li
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Ya-Li Xu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Shi-Hao Gao
- Shigatse Branch, Xinqiao Hospital, Third Military Medical University, Shigatse 857000, China
| | - Man-Yu Xu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Xian-Le Bu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Yu-Hui Liu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Jun Wang
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Jie Zhu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Fan Zeng
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Xiu-Qing Yao
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Chang-Yue Gao
- Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China; Department of Rehabilitation, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Zhi-Qiang Xu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China
| | - Xin-Fu Zhou
- School of Pharmacy and Medical Sciences and Sansom Institute, Division of Health Sciences, University of South Australia, Adelaide 5001, Australia
| | - Yan-Jiang Wang
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China; Chongqing Key Laboratory of Aging and Brain Diseases, Chongqing 400042, China; State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University, Chongqing 400042, China; Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.
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13
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Li WW, Shen YY, Chen DW, Li HY, Shi QQ, Mei J, Yang H, Zhou FY, Shi AY, Zhang T, Yao XQ, Xu ZQ, Zeng F, Wang YJ. Genetic Association Between NGFR, ADAM17 Gene Polymorphism, and Parkinson's Disease in the Chinese Han Population. Neurotox Res 2019; 36:463-471. [PMID: 30941646 DOI: 10.1007/s12640-019-00031-z] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/16/2019] [Accepted: 03/22/2019] [Indexed: 11/30/2022]
Abstract
Parkinson's disease (PD) is a common neurodegenerative disease characterized by neuronal loss in the substantia nigra. The p75 neurotrophin receptor (p75NTR, encoded by NGFR) was found to play an important role in the selective neuronal death of dopamine neurons in the substantia nigra, as well as the pathogenesis and development of PD. To assess the association between NGFR gene polymorphism and the susceptibility of PD, this case-control study consisting of 414 PD patients and 623 age- and sex-matched controls in a Chinese Han cohort was conducted. Twelve tag-single nucleotide polymorphisms (tag-SNPs) were selected from the NGFR gene through the construction of linkage disequilibrium blocks. One tag-SNP from the ADAM17 gene was also selected owing to its function of encoding tumor necrosis factor α-converting enzyme, which is responsible for the shedding of the extracellular domain of p75NTR. A multiplex polymerase chain reaction-ligase detection reaction (PCR-LDR) method was applied for genotyping. The associations between tag-SNPs and the risk of PD with the adjustment for age and sex were analyzed by unconditional logistic regression, and five genetic models including codominant, dominant, recessive, over-dominant, and additive models were applied. The results showed that among the 13 tag-SNPs, rs741073 was associated with a reduced risk of PD in the codominant (OR = 0.71, 95% CI = 0.54-0.93, P = 0.037), dominant (OR = 0.76, 95% CI = 0.58-0.98, P = 0.033), and over-dominant models (OR = 0.71, 95% CI = 0.54-0.92, P = 0.010), and rs1804011 was also associated with a reduced risk of PD in the codominant (OR = 0.69, 95% CI = 0.50-0.95, P = 0.049), dominant (OR = 0.69, 95% CI = 0.50-0.93, P = 0.014), over-dominant (OR = 0.70, 95% CI = 0.51-0.96, P = 0.025), and additive models (OR = 0.72, 95% CI = 0.54-0.94, P = 0.016). However, these associations did not retain after Bonferroni correction. Conclusively, our study failed to reveal the association between the selected tag-SNPs within NGFR, ADAM17, and the susceptibility of PD. The role of p75NTR and its gene polymorphisms in the pathogenesis of PD needs to be further studied.
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Affiliation(s)
- Wei-Wei Li
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Ying-Ying Shen
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Dong-Wan Chen
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Hui-Yun Li
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Qian-Qian Shi
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Jing Mei
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Heng Yang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Fa-Ying Zhou
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - An-Yu Shi
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Tao Zhang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Xiu-Qing Yao
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Zhi-Qiang Xu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Fan Zeng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
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14
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Chen YS, Lin XH, Li HR, Hua ZD, Lin MQ, Huang WS, Yu T, Lyu HY, Mao WP, Liang YQ, Peng XR, Chen SJ, Zheng H, Lian SQ, Hu XL, Yao XQ. [Etiological analysis and establishment of a discriminant model for lower respiratory tract infections in hospitalized patients]. Zhonghua Jie He He Hu Xi Za Zhi 2019; 40:909-914. [PMID: 29224300 DOI: 10.3760/cma.j.issn.1001-0939.2017.12.009] [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: To analyze the pathogens of lower respiratory tract infection(LRTI) including bacterial, viral and mixed infection, and to establish a discriminant model based on clinical features in order to predict the pathogens. Methods: A total of 243 hospitalized patients with lower respiratory tract infections were enrolled in Fujian Provincial Hospital from April 2012 to September 2015. The clinical data and airway (sputum and/or bronchoalveolar lavage) samples were collected. Microbes were identified by traditional culture (for bacteria), loop-mediated isothermal amplification(LAMP) and gene sequencing (for bacteria and atypical pathogen), or Real-time quantitative polymerase chain reaction (Real-time PCR)for viruses. Finally, a discriminant model was established by using the discriminant analysis methods to help to predict bacterial, viral and mixed infections. Results: Pathogens were detected in 53.9% (131/243) of the 243 cases.Bacteria accounted for 23.5%(57/243, of which 17 cases with the virus, 1 case with Mycoplasma pneumoniae and virus), mainly Pseudomonas Aeruginosa and Klebsiella Pneumonia. Atypical pathogens for 4.9% (12/243, of which 3 cases with the virus, 1 case of bacteria and viruses), all were mycoplasma pneumonia. Viruses for 34.6% (84/243, of which 17 cases of bacteria, 3 cases with Mycoplasma pneumoniae, 1 case with Mycoplasma pneumoniae and bacteria) of the cases, mainly Influenza A virus and Human Cytomegalovirus, and other virus like adenovirus, human parainfluenza virus, respiratory syncytial virus, human metapneumovirus, human boca virus were also detected fewly. Seven parameters including mental status, using antibiotics prior to admission, complications, abnormal breath sounds, neutrophil alkaline phosphatase (NAP) score, pneumonia severity index (PSI) score and CRUB-65 score were enrolled after univariate analysis, and discriminant analysis was used to establish the discriminant model by applying the identified pathogens as the dependent variable. The total positive predictive value was 64.7%(77/119), with 66.7% for bacterial infection, 78.0% for viral infection and 33.3% for the mixed infection. Conclusions: The mostly detected pathogens were Pseudomonas aeruginosa, atypitcal pathogens, Klebsiella pneumoniae, influenza A virus and human cytomegalovirus in hospitalized patients with LRTI in this hospital. The discriminant diagnostic model established by clinical features may contribute to predict the pathogens of LRTI.
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Affiliation(s)
- Y S Chen
- The Department of Respiratory and Critical Care Medicine, Fujian Province Hospital, Fuzhou 350001, China
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15
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Wang J, Jin WS, Bu XL, Zeng F, Huang ZL, Li WW, Shen LL, Zhuang ZQ, Fang Y, Sun BL, Zhu J, Yao XQ, Zeng GH, Dong ZF, Yu JT, Hu Z, Song W, Zhou HD, Jiang JX, Liu YH, Wang YJ. Physiological clearance of tau in the periphery and its therapeutic potential for tauopathies. Acta Neuropathol 2018; 136:525-536. [PMID: 30074071 DOI: 10.1007/s00401-018-1891-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 07/18/2018] [Accepted: 07/18/2018] [Indexed: 02/07/2023]
Abstract
Accumulation of pathological tau is the hallmark of Alzheimer's disease and other tauopathies and is closely correlated with cognitive decline. Clearance of pathological tau from the brain is a major therapeutic strategy for tauopathies. The physiological capacity of the periphery to clear brain-derived tau and its therapeutic potential remain largely unknown. Here, we found that cisterna magna injected 131I-labelled synthetic tau dynamically effluxed from the brain and was mainly cleared from the kidney, blood, and liver in mice; we also found that plasma tau levels in inferior vena cava were lower than those in femoral artery in humans. These findings suggest that tau proteins can efflux out of the brain and be cleared in the periphery under physiological conditions. Next, we showed that lowering blood tau levels via peritoneal dialysis could reduce interstitial fluid (ISF) tau levels in the brain, and tau levels in the blood and ISF were dynamically correlated; furthermore, tau efflux from the brain was accelerated after the addition of another set of peripheral system in a parabiosis model. Finally, we established parabiosis mouse models using tau transgenic mice and their wild-type littermates and found that brain tau levels and related pathologies in parabiotic transgenic mice were significantly reduced after parabiosis, suggesting that chronic enhancement of peripheral tau clearance alleviates pathological tau accumulation and neurodegeneration in the brain. Our study provides the first evidence of physiological clearance of brain-derived pathological tau in the periphery, suggesting that enhancing peripheral tau clearance is a potential therapeutic strategy for tauopathies.
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Affiliation(s)
- Jun Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Wang-Sheng Jin
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xian-Le Bu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Fan Zeng
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Zhi-Lin Huang
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Wei-Wei Li
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Lin-Lin Shen
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Zhen-Qian Zhuang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yuqiang Fang
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Bin-Lu Sun
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jie Zhu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Gui-Hua Zeng
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Zhi-Fang Dong
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Jin-Tai Yu
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao, China
| | - Zhian Hu
- Department of Physiology, Collaborative Innovation Center for Brain Science, Third Military Medical University, Chongqing, China
| | - Weihong Song
- Townsend Family Laboratories, Department of Psychiatry, Brain Research Center, The University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
| | - Hua-Dong Zhou
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jian-Xin Jiang
- State Key Laboratory of Trauma, Burn and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yu-Hui Liu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China.
| | - Yan-Jiang Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China.
- State Key Laboratory of Trauma, Burn and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, China.
- Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China.
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16
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Sun BL, Li WW, Zhu C, Jin WS, Zeng F, Liu YH, Bu XL, Zhu J, Yao XQ, Wang YJ. Clinical Research on Alzheimer's Disease: Progress and Perspectives. Neurosci Bull 2018; 34:1111-1118. [PMID: 29956105 DOI: 10.1007/s12264-018-0249-z] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [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: 03/01/2018] [Accepted: 04/27/2018] [Indexed: 12/12/2022] Open
Abstract
Alzheimer's disease (AD), the most common type of dementia, is becoming a major challenge for global health and social care. However, the current understanding of AD pathogenesis is limited, and no early diagnosis and disease-modifying therapy are currently available. During the past year, significant progress has been made in clinical research on the diagnosis, prevention, and treatment of AD. In this review, we summarize the latest achievements, including diagnostic biomarkers, polygenic hazard score, amyloid and tau PET imaging, clinical trials targeting amyloid-beta (Aβ), tau, and neurotransmitters, early intervention, and primary prevention and systemic intervention approaches, and provide novel perspectives for further efforts to understand and cure the disease.
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Affiliation(s)
- Bin-Lu Sun
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Wei-Wei Li
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Chi Zhu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Wang-Sheng Jin
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Fan Zeng
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Yu-Hui Liu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Xian-Le Bu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Jie Zhu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China
| | - Xiu-Qing Yao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.
| | - Yan-Jiang Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.
- State Key Laboratory of Trauma, Burn and Combined Injury, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing, 400042, China.
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Jin WS, Bu XL, Wang YR, Li L, Li WW, Liu YH, Zhu C, Yao XQ, Chen Y, Gao CY, Zhang T, Zhou HD, Zeng F, Wang YJ. Reduced Cardiovascular Functions in Patients with Alzheimer’s Disease. J Alzheimers Dis 2017; 58:919-925. [DOI: 10.3233/jad-170088] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Chen SH, Bu XL, Jin WS, Shen LL, Wang J, Zhuang ZQ, Zhang T, Zeng F, Yao XQ, Zhou HD, Wang YJ. Altered peripheral profile of blood cells in Alzheimer disease: A hospital-based case-control study. Medicine (Baltimore) 2017; 96:e6843. [PMID: 28538375 PMCID: PMC5457855 DOI: 10.1097/md.0000000000006843] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 12/19/2022] Open
Abstract
Alzheimer disease (AD) has been made a global priority for its multifactorial pathogenesis and lack of disease-modifying therapies. We sought to investigate the changes of profile of blood routine in AD and its correlation with the disease severity.In all, 92 AD patients and 84 age and sex-matched normal controls were enrolled and their profiles of blood routine were evaluated.Alzheimer disease patients had increased levels of mean corpuscular hemoglobin, mean corpuscular volume, red cell distribution width-standard deviation, mean platelet volume,and decreased levels of platelet distribution width, red blood cell, hematocrit, hemoglobin, lymphocyte, and basophil compared with normal controls.Alterations in quantity and quality of blood cells may be involved in the pathogenesis of AD and contribute to the disease progression.
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Wang QH, Wang YR, Zhang T, Jiao SS, Liu YH, Zeng F, Li J, Yao XQ, Zhou HD, Zhou XF, Wang YJ. Intramuscular delivery of p75NTR ectodomain by an AAV vector attenuates cognitive deficits and Alzheimer's disease-like pathologies in APP/PS1 transgenic mice. J Neurochem 2016; 138:163-73. [PMID: 26991827 DOI: 10.1111/jnc.13616] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 03/02/2016] [Accepted: 03/09/2016] [Indexed: 01/25/2023]
Abstract
The neurotrophin receptor p75 (p75NTR) is a receptor for amyloid-beta (Aβ) and mediates Aβ-induced neurodegenerative signals. The ectodomain of p75NTR (p75ECD) is a physiological protective factor against Aβ in Alzheimer's disease (AD). We have previously demonstrated that the shedding of p75ECD from the cell surface is down-regulated in AD brains and restoration of the p75ECD level in the brain, through intracranial administration of p75ECD by adeno-associated virus vectors, attenuates AD-like pathologies in an AD mouse model. In this study, we further investigated the feasibility and efficacy of peripheral administration of AAV-p75ECD on brain amyloid burden and associated pathogenesis. We found that intramuscular delivery of AAV-p75ECD increased the level of p75ECD in the blood, significantly improved the behavioral phenotype of amyloid precursor protein/PS1 transgenic mice, and reduced brain amyloid burden, attenuated Tau hyperphosphorylation, and neuroinflammation. Furthermore, intramuscular delivery of AAV-p75ECD was well tolerated. Our results indicate that peripheral delivery of p75ECD represents a safe and effective therapeutic strategy for AD. The ectodomain of p75NTR (p75ECD) is a physiological protective factor against amyloid-beta (Aβ) in Alzheimer's disease (AD). Intramuscular delivery of AAV-p75ECD increased the p75ECD levels in the blood, reduced brain amyloid burden through a 'peripheral sink' mechanism and alleviates AD-type pathologies. Peripheral delivery of p75ECD represents a promising therapeutic strategy for AD.
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Affiliation(s)
- Qing-Hua Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ye-Ran Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Tao Zhang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Shu-Sheng Jiao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yu-Hui Liu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Fan Zeng
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jing Li
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Hua-Dong Zhou
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xin-Fu Zhou
- Division of Health Sciences, School of Pharmacy and Medical Sciences and Sansom Institute, University of South Australia, Adelaide, South Australia, Australia
| | - Yan-Jiang Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
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Liu CH, Bu XL, Wang J, Zhang T, Xiang Y, Shen LL, Wang QH, Deng B, Wang X, Zhu C, Yao XQ, Zhang M, Zhou HD, Wang YJ. The Associations between a Capsaicin-Rich Diet and Blood Amyloid-β Levels and Cognitive Function. J Alzheimers Dis 2016; 52:1081-8. [DOI: 10.3233/jad-151079] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Jiao SS, Bu XL, Liu YH, Zhu C, Wang QH, Shen LL, Liu CH, Wang YR, Yao XQ, Wang YJ. Sex Dimorphism Profile of Alzheimer's Disease-Type Pathologies in an APP/PS1 Mouse Model. Neurotox Res 2015; 29:256-66. [PMID: 26707129 DOI: 10.1007/s12640-015-9589-x] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/06/2015] [Accepted: 12/10/2015] [Indexed: 01/23/2023]
Abstract
Alzheimer's disease (AD) is the most common form of dementia among the elderly, characterized by parenchymal and vascular beta-amyloid (Aβ) burden, tau pathology, neuroinflammation, and loss of neurons and synapses. There is a clear sex difference in the prevalence of AD. However, sex differences in AD-type pathologies have not been systematically documented. Applying 12-month-old female and male APP/PS1 mice as a model, we investigated the sex dimorphism in these major pathological indices. Compared with male APP/PS1 mice, the females exhibited higher parenchymal Aβ burdens, with the sex difference in hippocampus being the most significant. Female APP/PS1 mice had more severe cerebral amyloid angiopathy and subsequent microhemorrhage. In addition, female APP/PS1 mice also showed higher levels of phosphorylated tau and proinflammatory cytokines, more severe astrocytosis and microgliosis, and greater neuronal and synaptic degenerations. The present study systematically described a sex dimorphism in AD-type pathologic indices, suggesting that gender should be taken into account in designing studies involving these pathological indices and when interpreting the relevant findings in those studies.
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Affiliation(s)
- Shu-Sheng Jiao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xian-Le Bu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yu-Hui Liu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Chi Zhu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Qing-Hua Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Lin-Lin Shen
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Cheng-Hui Liu
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Ye-Ran Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Xiu-Qing Yao
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Yan-Jiang Wang
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China.
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Bu XL, Liu YH, Wang QH, Jiao SS, Zeng F, Yao XQ, Gao D, Chen JC, Wang YJ. Serum amyloid-beta levels are increased in patients with obstructive sleep apnea syndrome. Sci Rep 2015; 5:13917. [PMID: 26351108 PMCID: PMC4563592 DOI: 10.1038/srep13917] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 08/11/2015] [Indexed: 11/21/2022] Open
Abstract
A critical link between amyloid-beta (Aβ) and hypoxia has been demonstrated in in vitro and animal studies but has not yet been proven in humans. Obstructive sleep apnea syndrome (OSAS) is a common disorder that is characterized by nocturnal intermittent hypoxaemia. This study sought to examine the association between the chronic intermittent hypoxia and Aβ in OSAS patients. Forty-five cognitively normal OSAS patients and forty-nine age- and gender-matched subjects diagnosed with simple snoring and not OSAS were included in the present study. Serum Aβ40, Aβ42, total tau and phosphorylated tau 181 (P-tau 181) levels were measured using ELISA kits. All subjects were evaluated with nighttime polysomnography and cognitive tests. Compared with the controls, the OSAS patients exhibited significantly higher serum Aβ40, Aβ42 and total Aβ levels, and each of these levels was positively correlated with the apnea-hypopnea index, the oxygen desaturation index, and the mean and lowest oxyhaemoglobin saturations in the OSAS patients. Moreover, the OSAS patients exhibited strikingly higher serum P-tau 181 levels, and these levels were positively correlated with serum Aβ levels. This study suggests that there is an association between chronic intermittent hypoxia and increased Aβ levels, implying that hypoxia may contribute to the pathogenesis of Alzheimer’s disease.
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Affiliation(s)
- Xian-Le Bu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Yu-Hui Liu
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Qing-Hua Wang
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Shu-Sheng Jiao
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Fan Zeng
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Xiu-Qing Yao
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Dong Gao
- Department of Sleep center, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Ji-Chuan Chen
- Department of Otolaryngology Head and Neck Surgery, Daping Hospital, Third Military Medical University, Chongqing 400042, China
| | - Yan-Jiang Wang
- Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, Third Military Medical University, Chongqing 400042, China
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Liu YH, Bu XL, Liang CR, Wang YR, Zhang T, Jiao SS, Zeng F, Yao XQ, Zhou HD, Deng J, Wang YJ. An N-terminal antibody promotes the transformation of amyloid fibrils into oligomers and enhances the neurotoxicity of amyloid-beta: the dust-raising effect. J Neuroinflammation 2015; 12:153. [PMID: 26311039 PMCID: PMC4551765 DOI: 10.1186/s12974-015-0379-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 08/17/2015] [Indexed: 12/16/2022] Open
Abstract
Background Senile plaques consisting of amyloid-beta (Aβ) are the major pathological hallmark of Alzheimer’s disease (AD) and have been the primary therapeutic target. Immunotherapies, which are designed to remove brain Aβ deposits, increased levels of soluble Aβ and accelerated brain atrophy in some clinical trials, suggesting that the solubilization of Aβ deposition might facilitate the formation of more toxic Aβ oligomers and enhance neurotoxicity. Methods The capacity of antibodies against different epitopes of Aβ to disaggregate preformed Aβ fibrils was investigated. The co-incubation of antibodies and Aβ fibrils was then tested for neurotoxicity both in vitro and in vivo. Results After the incubation of preformed Aβ fibrils with the N-terminal antibody 6E10, the fibrils were decreased, while the oligomers, mostly dimers and trimers, were significantly increased. However, no such effects were observed for antibodies targeting the middle domain (4G8) and C-terminus of Aβ (8G7). The co-incubates of preformed Aβ fibrils with 6E10 were more neurotoxic, both in vitro and in vivo, than the co-incubates with 4G8 and 8G7. Conclusions Our results indicate that the antibody targeting the N-terminus of Aβ promoted the transformation of Aβ from fibrils into oligomers and increased neurotoxicity. Immunotherapies should take into consideration the enhanced neurotoxicity associated with the solubilization of Aβ deposits by antibodies against the Nterminus of Aβ.
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Affiliation(s)
- Yu-Hui Liu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Xian-Le Bu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Chun-Rong Liang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Ye-Ran Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Tao Zhang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Shu-Sheng Jiao
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Fan Zeng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Xiu-Qing Yao
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Hua-Dong Zhou
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Juan Deng
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
| | - Yan-Jiang Wang
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Research Institute of Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, 400042, China.
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Shang XL, Wang QB, Liu XP, Yao XQ, Cao FY, Wang Q, Zhang JY, Wang JZ, Liu GP. Fluorocitrate induced the alterations of memory-related proteins and tau hyperphosphorylation in SD rats. Neurosci Lett 2014; 584:230-5. [PMID: 25449869 DOI: 10.1016/j.neulet.2014.10.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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: 08/07/2014] [Revised: 10/03/2014] [Accepted: 10/20/2014] [Indexed: 01/22/2023]
Abstract
Astrocytes provide structural, metabolic and trophic supports for neurons. However, there are no direct evidences whether astrocytes involve in the regulation of synaptic proteins expression and tau phosphorylation until now. Here, we injected 1 nmol fluorocitrate (FC), which preferentially taken up by astrocytes and results in reversible inhibition of the astrocytic tricarboxylic acid cycle, into the left lateral ventricle of the brain in the SD rats for 1h, and found that FC treatment decreased several memory-related proteins levels, such as AMPA receptor GluR1/2, postsynaptic density protein 93/95, Arc and phosphorylated cAMP response element binding proteins, while increased synaptophysin and synapsin I levels in the hippocampus. FC treatment also increased the levels of phosphorylated tau at multiple Alzheimer-related phosphorylation sites, as well as activation of glycogen synthase kinase-3β and inactivation of protein phosphatase-2A. Similar effects were also observed in the primary hippocampal neurons, which were cultured with the conditioned media from FC-treatment primary astrocytes. Our data suggest that astrocytes regulate neuronal tau phosphorylation and several synaptic proteins expression.
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Affiliation(s)
- Xiao-Ling Shang
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China
| | - Quan-Bao Wang
- Department of Neurology, The People's Hospital of Linfen City, Shangdong Province 276000, PR China
| | - Xiu-Ping Liu
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China
| | - Xiu-Qing Yao
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Department of Neurology, The People's Hospital of Linfen City, Shangdong Province 276000, PR China
| | - Fu-Yuan Cao
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China
| | - Qun Wang
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China
| | - Jia-Yu Zhang
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Yichang Central People's Hospital, The First College of Clinical Medical Science, China Three Gorges University, Yichang, China.
| | - Jian-Zhi Wang
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China.
| | - Gong-Ping Liu
- Department of Pathophysiology, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China; Key Laboratory of Ministry of Education for Neurological Disorders, the School of Basic Medicine, Tongji Medical College, Wuhan, PR China.
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Liu YH, Xiang Y, Wang YR, Jiao SS, Wang QH, Bu XL, Zhu C, Yao XQ, Giunta B, Tan J, Zhou HD, Wang YJ. Association Between Serum Amyloid-Beta and Renal Functions: Implications for Roles of Kidney in Amyloid-Beta Clearance. Mol Neurobiol 2014; 52:115-9. [PMID: 25119777 DOI: 10.1007/s12035-014-8854-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 08/04/2014] [Indexed: 11/28/2022]
Abstract
Amyloid-beta (Aβ) plays a central role in the pathogenesis of Alzheimer's disease (AD), and it is a major therapeutic target for AD. It is proposed that removal of Aβ in blood can facilitate Aβ clearance from the brain, representing a promising therapeutic approach for AD. However, the efficacy and mechanisms for Aβ clearance by peripheral organs and tissues remain largely unknown. In the present study, 47 chronic kidney disease (CKD) patients (16 newly diagnosed patients who had never been dialyzed and 31 patients who were receiving dialysis) and 43 normal controls (NC) were enrolled. We found that serum Aβ levels were significantly higher in CKD patients than NC. CKD patients who were receiving dialysis had lower serum Aβ levels than patients without receiving dialysis, being comparable to NC. Furthermore, serum Aβ levels were correlated with renal functions reflected by estimated glomerular filtration rate (eGFR) and residual GFR (rGFR). Our study suggests that kidney is involved in peripheral clearance of Aβ, and dialysis might be a potential therapeutic approach of Aβ removal.
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Affiliation(s)
- Yu-Hui Liu
- Department of Neurology and Centre for Clinical Neuroscience, Daping Hospital and Institute of Field Surgery, Third Military Medical University, 10 Changjiang Branch Road, Yuzhong District, Chongqing, China
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26
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Liu YH, Jiao SS, Wang YR, Bu XL, Yao XQ, Xiang Y, Wang QH, Wang L, Deng J, Li J, Zhou XF, Zhou HD, Wang YJ. Associations Between ApoEε4 Carrier Status and Serum BDNF Levels—New Insights into the Molecular Mechanism of ApoEε4 Actions in Alzheimer’s Disease. Mol Neurobiol 2014; 51:1271-7. [DOI: 10.1007/s12035-014-8804-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 06/22/2014] [Indexed: 12/11/2022]
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27
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Deng B, Lian Y, Wang X, Zeng F, Jiao B, Wang YR, Liang CR, Liu YH, Bu XL, Yao XQ, Zhu C, Shen L, Zhou HD, Zhang T, Wang YJ. Identification of a Novel Mutation in the Presenilin 1 Gene in a Chinese Alzheimer’s Disease Family. Neurotox Res 2014; 26:211-5. [DOI: 10.1007/s12640-014-9462-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 02/20/2014] [Accepted: 02/20/2014] [Indexed: 11/24/2022]
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Yao XQ, Li XC, Zhang XX, Yin YY, Liu B, Luo DJ, Wang Q, Wang JZ, Liu GP. Glycogen synthase kinase-3β regulates leucine-309 demethylation of protein phosphatase-2A via PPMT1 and PME-1. FEBS Lett 2012; 586:2522-8. [PMID: 22732552 DOI: 10.1016/j.febslet.2012.06.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2012] [Revised: 06/06/2012] [Accepted: 06/08/2012] [Indexed: 11/29/2022]
Abstract
Protein phosphatase-2A (PP2A) activity is significantly suppressed in Alzheimer's disease. We have reported that glycogen synthase kinase-3β (GSK-3β) inhibits PP2A via upregulating the phosphorylation of PP2A catalytic subunit (PP2A(C)). Here we studied the effects of GSK-3β on the inhibitory demethylation of PP2A at leucine-309 (dmL309-PP2A(C)). We found that GSK-3β regulates dmL309-PP2A(C) level by regulating PME-1 and PPMT1. Knockdown of PME-1 or PPMT1 eliminated the effects of GSK-3β on PP2A(C). GSK-3 could negatively regulate PP2A regulatory subunit protein level. We conclude that GSK-3β can inhibit PP2A by increasing the inhibitory L309-demethylation involving upregulation of PME-1 and inhibition of PPMT1.
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Affiliation(s)
- Xiu-Qing Yao
- Department of Pathophysiology, Key Laboratory of Neurological Diseases of Chinese Ministry of Education, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
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Chen NN, Luo DJ, Yao XQ, Yu C, Wang Y, Wang Q, Wang JZ, Liu GP. Pesticides Induce Spatial Memory Deficits with Synaptic Impairments and an Imbalanced Tau Phosphorylation in Rats. ACTA ACUST UNITED AC 2012; 30:585-94. [DOI: 10.3233/jad-2012-111946] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Ning-Ning Chen
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Dan-Ju Luo
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Xiu-Qing Yao
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Cong Yu
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Yi Wang
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Qun Wang
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Jian-Zhi Wang
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
| | - Gong-Ping Liu
- Department of Pathophysiology, Key Laboratory of Chinese Ministry of Education for Neurological Diseases, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, PR China
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Liu GP, Wei W, Zhou X, Zhang Y, Shi HH, Yin J, Yao XQ, Peng CX, Hu J, Wang Q, Li HL, Wang JZ. I2PP2A regulates p53 and Akt correlatively and leads the neurons to abort apoptosis. Neurobiol Aging 2012; 33:254-64. [DOI: 10.1016/j.neurobiolaging.2010.01.016] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 01/18/2010] [Accepted: 01/19/2010] [Indexed: 01/07/2023]
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Hong XP, Peng CX, Wei W, Tian Q, Liu YH, Yao XQ, Zhang Y, Cao FY, Wang Q, Wang JZ. Essential role of tau phosphorylation in adult hippocampal neurogenesis. Hippocampus 2011; 20:1339-49. [PMID: 19816983 DOI: 10.1002/hipo.20712] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
An increased hippocampal neurogenesis has been observed in Alzheimer disease (AD), the most common neurodegenerative disorder characterized with accumulation of β-amyloid (Aβ) and hyperphosphorylated tau (p-tau). Studies in transgenic mouse models suggest that the amyloidosis suppresses adult neurogenesis. Although emerging evidence links tau to neurodevelopment, the direct data regarding tau phosphorylation in adult neurogenesis is missing. Here, we found that the immature neurons, identified by doublecortin (DCX) and neurogenic differentiation factor (neuroD), were only immunoreactive to p-tau but not to the non-p-tau in adult rat brain and human patients with AD, and the p-tau was coexpressed temporally and spatially with DCX and neuroD in the hippocampal dentate gyrus (DG) of the rat brains during postnatal development. A correlative increase of immature neuron markers and tau phosphorylation was induced in rat hippocampal DG by upregulating glycogen synthase kinase-3 (GSK-3), a crucial tau kinase, and the increased neurogenesis was due to an enhanced proliferation but not survival or differentiation of the newborn neurons. The hippocampal neurogenesis was severely impaired in tau knockout mice and activation of GSK-3 in these mice did not rescue the deficits. These results reveal an essential role of tau phosphorylation in adult hippocampal neurogenesis. It suggests that spatial/temporal manipulation of tau phosphorylation may be compensatory for the neuron loss in neurological disorders, including AD.
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Affiliation(s)
- Xiao-Ping Hong
- Department of Pathophysiology, Key Laboratory of Neurological Diseases of Education Committee of China, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
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32
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Kwan HY, Huang Y, Yao XQ, Leung FP. Role of cyclic nucleotides in the control of cytosolic Ca2+ levels in vascular endothelial cells. Clin Exp Pharmacol Physiol 2009; 36:857-66. [PMID: 19413591 DOI: 10.1111/j.1440-1681.2009.05199.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
1. Endothelial cells have a key role in the cardiovascular system. Most endothelial cell functions depend on changes in cytosolic Ca(2+) concentrations ([Ca(2+)](i)) to some extent and Ca2+ signalling acts to link external stimuli with the synthesis and release of regulatory factors in endothelial cells. The [Ca(2+)](i) is maintained by a well-balanced Ca(2+) flux across the endoplasmic reticulum and plasma membrane. 2. Cyclic nucleotides, such as cAMP and cGMP, are very important second messengers. The cyclic nucleotides can affect [Ca(2+)](i) directly or indirectly (via the actions of protein kinase (PK) A or PKG-mediated phosphorylation) by regulating Ca(2+) mobilization and Ca(2+) influx. Fine-tuning of [Ca(2+)](i) is also fundamental to protect endothelial cells against damaged caused by the excessive accumulation of Ca(2+). 3. Therapeutic agents that control cAMP and cGMP levels have been used to treat various cardiovascular diseases. 4. The aim of the present review is to discuss: (i) the functions of endothelial cells; (ii) the importance of [Ca(2+)](i) in endothelial cells; (iii) the impact of excessive [Ca(2+)](i) in endothelial cells; and (iv) the balanced control of [Ca(2+)](i) in endothelial cells via involvement of cyclic nucleotides (cAMP and cGMP) and their general effectors.
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Affiliation(s)
- H Y Kwan
- School of Biomedical Sciences, Chinese University of Hong Kong, Hong Kong, China
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33
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Liu GP, Zhang Y, Yao XQ, Zhang CE, Fang J, Wang Q, Wang JZ. Activation of glycogen synthase kinase-3 inhibits protein phosphatase-2A and the underlying mechanisms. Neurobiol Aging 2008; 29:1348-58. [PMID: 17433504 DOI: 10.1016/j.neurobiolaging.2007.03.012] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 01/24/2007] [Accepted: 03/07/2007] [Indexed: 11/24/2022]
Abstract
The activity of protein phosphatase-2A (PP-2A) is significantly suppressed in the brain of Alzheimer's disease (AD) patients, but the mechanism is not understood. Here, we found an in vivo association of glycogen synthase kinase 3beta (GSK-3beta) with inhibitor-2 of PP-2A (I(2)(PP-2A)). The activation of GSK-3 resulted in accumulation of I(2)(PP-2A) with concomitant suppression of PP-2A activity and increases of tau phosphorylation in HEK293, N2a and PC12 cells, while inhibition of GSK-3 caused decreases of I(2)(PP-2A) with increased PP-2A activity and decreased tau phosphorylation. A positive correlation between GSK-3beta and I(2)(PP-2A) (R=0.9158) and a negative correlation between GSK-3beta and PP-2A (R=-0.9166) were detected. GSK-3 activation did not affect I(2)(PP-2A) mRNA level, while it increased the mRNA level of a heterogeneous ribonucleoprotein A18 (hnRNP A18). The activation of GSK-3 increased the expression and the activity of proteasome system. It suggests that activation of GSK-3 inhibits PP-2A through up-regulation of I(2)(PP-2A) with hnRNP A18-involved mechanism.
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Affiliation(s)
- Gong-Ping Liu
- Pathophysiology Department, Key Laboratory of Neurological Disease of Hubei Province, Tongji Medical College, Hua-Zhong University of Science and Technology, Wuhan 430030, PR China
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Yung LM, Wong WT, Leung FP, Yao XQ, Chen ZY, Huang Y. A key role of AT1R in endothelial dysfunction during estrogen deficiency. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.1119.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | - ZY Chen
- BiochemistryChinese University of Hong KongHong Kong SARPeople's Republic of China
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35
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YUNG LM, Wong WT, Tian XY, Leung FP, Chen ZY, Yao XQ, Vanhoutte PM, Huang Y. Cranberry juice consumption ameliorates endothelial dysfunction during estrogen deficiency: balance between NO and ROS. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.1149.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | - ZY Chen
- BiochemistryChinese University of Hong KongHong Kong SARPeople's Republic of China
| | | | - PM Vanhoutte
- PharmacologyUniversity of Hong KongHong Kong SARPeople's Republic of China
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36
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Tang NLS, Chow CC, Ko GTC, Tai MHL, Kwok R, Yao XQ, Cockram CS. The alpha(1S) subunit of the L-type calcium channel is not a predisposition gene for thyrotoxic periodic paralysis. Clin Endocrinol (Oxf) 2007; 66:229-34. [PMID: 17223993 DOI: 10.1111/j.1365-2265.2006.02713.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Thyrotoxic periodic paralysis (TTP) has been associated with genetic variations in the gene encoding the alpha 1 subunit of the L-type calcium channel (CACNA1S). Mutations in CACNA1S are known to account for the majority of cases of familial hypokalaemic periodic paralysis (HOKPP). In this study we have examined 48 genetic polymorphisms in the CACNA1S gene and genotyped a tagging set of representative polymorphisms to determine the role of this gene in TPP. DESIGN AND PATIENTS A genetic association study was carried out with 98 TPP patients and 162 male thyrotoxic controls. Among 47 polymorphisms evaluated for linkage disequilibrium (LD) and the spectrum of haplotypes in the Chinese population, 31 were selected as tagging single-nucleotide polymorphisms (SNPs) for genotyping the whole sample. A new genotyping protocol was used to analyse an insertion/deletion (I/D) polymorphism. RESULTS We studied the LD among 47 polymorphisms in the CACNA1S gene, which comprised a set of high-density markers with an average of one SNP every 2 kb. Subsequently, 31 tagSNPs were genotyped for all the samples. The gene is composed of three LD blocks. With this block structure, we were confident that variations of the gene were comprehensively covered by the tagSNPs. No significant association was found between the polymorphisms and TPP. CONCLUSION We established the LD structure of this calcium channel subunit gene (CACNA1S) for the first time. However, its genetic variations are not associated with TPP in Chinese patients.
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Affiliation(s)
- Nelson L S Tang
- Department of Chemical Pathology, Faculty of Medicine, The Chinese Univerisity of Hong Kong SAR, China.
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Chan YC, Yao XQ, Lau CW, Chan FL, He GW, Bourreau JP, Huang Y. The relaxant effect of urocortin in rat pulmonary arteries. ACTA ACUST UNITED AC 2005; 121:11-8. [PMID: 15256268 DOI: 10.1016/j.regpep.2004.03.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2003] [Revised: 03/04/2004] [Accepted: 03/09/2004] [Indexed: 11/16/2022]
Abstract
Urocortin is a potent vasodilator, which plays physiological or pathophysiological roles in systemic circulation. However, little is known about its action on pulmonary circulation. The present study was aimed to characterize some cellular mechanisms underlying the relaxant effect of urocortin in isolated rat pulmonary arteries. Changes in isometric tension were measured on small vessel myographs. Urocortin inhibited U46619-induced contraction with reduction of the maximal response. Urocortin-induced relaxation was independent of the presence of endothelium. Inhibitors of nitric oxide (NO)-dependent dilator, NG-nitro-L-arginine methyl ester or 1H-[1,2,4]oxadizolo[4,3-a]quinoxalin-1-one, did not affect the relaxation. Astressin (100-500 nM), a corticotropin-releasing factor (CRF) receptor antagonist and KT5720, a protein kinase A (PKA) inhibitor reduced urocortin-induced relaxation. Urocortin produced less relaxant effect in 30 mM K+- than U46619-contracted arterial rings. Urocortin did not reduce CaCl2-induced contraction in 60 mM K+-containing solution. Ba2+ (100-500 microM) but not other K+ channel blockers reduced the relaxant responses to urocortin. Urocortin also relaxed the rings preconstricted by phorbol 12,13-diacetae in normal Krebs solution while this relaxation was less in a Ca2+-free solution. Our results show that urocortin relaxed rat pulmonary arteries via CRF receptor-mediated and PKA-dependent but endothelium/NO or voltage-gated Ca2+ channel-independent mechanisms. Stimulation of Ba2+-sensitive K+ channel may contribute to urocortin-induced relaxation. Finally, urocortin relaxed pulmonary arteries partly via inhibition of a PKC-dependent contractile mechanism.
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Affiliation(s)
- Y C Chan
- Department of Physiology, Chinese University of Hong Kong, Shatin, NT, Hong Kong, China
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38
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Tang NLS, Chow CC, Ko GTC, Tai MHL, Kwok R, Yao XQ, Cockram CS. No mutation in the KCNE3 potassium channel gene in Chinese thyrotoxic hypokalaemic periodic paralysis patients. Clin Endocrinol (Oxf) 2004; 61:109-12. [PMID: 15212652 DOI: 10.1111/j.1365-2265.2004.02079.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES Mutation in KCNE3 gene (Isk-related family potassium voltage-gated channel member 3 gene) was recently associated with the aetiology of thyrotoxic periodic paralysis (TPP). We studied 79 Chinese TPP patients by DNA sequencing of the entire coding sequence of KCNE3 to determine if this gene is the cause of TPP in Chinese patients. DESIGN AND MEASUREMENTS A case-control genetic association study was carried out to determine the role of mutation/polymorphism in KCNE3 gene in the pathogenesis of TPP. Genomic DNA was extracted from peripheral blood samples. DNA sequencing was performed to cover the coding region of the KCNE3 gene for the TPP subjects. Restriction fragment length polymorphism was used to genotype specific sequence variants. subjects Seventy-nine TPP patients (cases) and 111 male thyrotoxic patients without history of paralysis (controls) were identified from thyroid clinic and during acute admission in a teaching hospital. RESULTS No pathogenic mutation in KCNE3 was found in the TPP patients. The reported R83H mutation was also not found in the Chinese TPP patients. In addition, another silent polymorphism, 290T/C, was also not associated with TPP. CONCLUSION The results indicate that mutation in KCNE3 is not a cause of TPP in Chinese patients.
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Affiliation(s)
- Nelson L S Tang
- Department of Chemical Pathology, Faculty of Medicine, The Chinese University of Hong Kong, Kong Kong.
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Chan HY, Yao XQ, He GW, Tsang SY, Wong CM, Huang Y. Short‐Term Incubation with Physiological Level of Estrogen Impairs ß
1
‐Adrenoceptor‐Mediated but Enhances ß
2
‐Adrenoceptor Mediated Coronary Relaxation. J Card Surg 2003. [DOI: 10.1046/j.1540-8191.2002.101416.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- HY Chan
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
| | - XQ Yao
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
| | - GW He
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
| | - SY Tsang
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
| | - CM Wong
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
| | - Y Huang
- Departments of Physiology and Surgery, Chinese University of Hong Kong, Hong Kong
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40
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Tsang SY, Yao XQ, Wong CM, Lau CW, Huang Y. Multiplicity in the Vascular Response to Pinacidil in Rat Mesenteric Artereies. J Card Surg 2003. [DOI: 10.1046/j.1540-8191.2002.101418.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- SY Tsang
- Departments of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - XQ Yao
- Departments of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - CM Wong
- Departments of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - CW Lau
- Departments of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - Y Huang
- Departments of Physiology, Chinese University of Hong Kong, Hong Kong, China
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41
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Chan HY, Yao XQ, Tsang SY, Bourreau BP, Chan FL, Huang Y. Role of Endothelium/Nitric Oxide and Cyclic AMP in Isoproterenol Potentiation of 17ß‐Estradiol‐Mediated Vasorelaxation. J Card Surg 2003. [DOI: 10.1046/j.1540-8191.2002.10149.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- HY Chan
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
| | - XQ Yao
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
| | - SY Tsang
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
| | - BP Bourreau
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
| | - FL Chan
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
| | - Y Huang
- Department of Physiology, Chinese University of Hong Kong and Hong Kong University, Hong Kong, China
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Wong CM, Yao XQ, Tsang SY, Huang Y. Different Effects of Estrogen and Progesterone on K
+
Currents Expressed in
Xenopus
Oocytes. J Card Surg 2003. [DOI: 10.1046/j.1540-8191.2002.101419.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- CM Wong
- Department of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - XQ Yao
- Department of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - SY Tsang
- Department of Physiology, Chinese University of Hong Kong, Hong Kong, China
| | - Y Huang
- Department of Physiology, Chinese University of Hong Kong, Hong Kong, China
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Abstract
Berberine, is an alkaloid from Hydrastis canadensis L., Chinese herb Huanglian, and many other plants. It is widely used in traditional Chinese medicine as an antimicrobial in the treatment of dysentery and infectious diarrhea. This manuscript describes cardiovascular effects of berberine and its derivatives, tetrahydroberberine and 8-oxoberberine. Berberine has positive inotropic, negative chronotropic, antiarrhythmic, and vasodilator properties. Both derivatives of berberine have antiarrhythmic activity. Some cardiovascular effects of berberine and its derivatives are attributed to the blockade of K+ channels (delayed rectifier and K(ATP)) and stimulation of Na+ -Ca(2+) exchanger. Berberine has been shown to prolong the duration of ventricular action potential. Its vasodilator activity has been attributed to multiple cellular mechanisms. The cardiovascular effects of berberine suggest its possible clinical usefulness in the treatment of arrhythmias and/or heart failure.
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Affiliation(s)
- C W Lau
- Department of Physiology, Chinese University of Hong Kong, Shatin, Hong Kong, China
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44
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Abstract
The modulatory effect of the protein kinase C activator was examined on contraction of rat isolated vas deferens induced by constrictive agonists, noradrenaline (NA), ATP, BaCl2 and high K+. Phorbol 12,13-diacetate (PDA, 1 micromol/l) induced a transient extracellular Ca(2+)-dependent contraction while the inactive analogue, 4alpha-phorbol (1 micromol/l) had no effect. PDA significantly enhanced the peak amplitude of the contractile response to NA (0.1-10 micromol/l), ATP (100 micromol/l), Ba2+ (3 mmol/l) or high K+ (30 mmol/l). Staurosporine at 30 nmol/l reduced the enhancing effect of PDA on the agonist-induced contraction. NA (10 micromol/l) produced a phasic contraction followed by a sustained contraction, while ATP induced monophasic contraction. Pretreatment with nifedipine (10 nmol/l) had no effect on the phasic contraction induced by NA, but it significantly reduced ATP- or high K(+)-induced contraction. Staurosporine (30 nmol/l) alone attenuated the peak contractile response induced by NA or ATP but not by Ba2+. NA produced a transient contraction in Ca(2+)-free Krebs solution, and PDA (1 micromol/l) markedly enhanced this effect. These novel data indicate that activation of a protein kinase C-dependent mechanism not only affects contraction mediated by Ca2+ influx through voltage-sensitive Ca2+ channels, but also promotes intracellular Ca2+ release or intracellular Ca(2+)-mediated contractile mechanism in rat vas deferens.
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Affiliation(s)
- Y Huang
- Department of Physiology, Chinese University of Hong Kong, Shatin, Hong Kong, China.
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45
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Huang Y, Yao XQ, Tsang SY, Lau CW, Chen ZY. Role of endothelium/nitric oxide in vascular response to flavonoids and epicatechin. Acta Pharmacol Sin 2000; 21:1119-24. [PMID: 11603286] [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 examine the role of endothelium in the vascular responses to flavonoids, baicalein, baicalin, cardamonin, alpinetin, and to purified jasmine green tea (-)epicatechin in the isolated rate mesenteric artery rings. METHODS The isometric contraction was measured by Grass force-displacement transducers. RESULTS Both baicalein and baicalin enhanced the phenylephrine-induced contractile response in the endothelium-intact rings. This enhancement was abolished by pretreatment with the nitric oxide inhibitor NG-nitro-L-arginine or in the absence of the endothelium. Both flavonoids also inhibited the acetylcholine-induced endothelial nitric oxide-dependent relaxation. In contrast, cardamonin, alpinetin or (-)epicatechin induced both endothelium-dependent and -independent relaxation. NG-nitro-L-arginine meyhyl ester or endothelium denudation attenuated the endothelium-dependent relaxation to the same extent. CONCLUSION Baicalein and baicalin enhanced the phenylephrine-induced contraction most likely through inhibiting production or/and release of endothelial nitric oxide. Whilst, cardamonin-, alpinetin- or (-)epicatechin-induced endothelium-dependent relaxation is primarily mediated through endothelial nitric oxide.
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Affiliation(s)
- Y Huang
- Departments of Physiology and Biochemistry, Faculty of Medicine, Chinese University of Hong Kong, Hong Kong, China.
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46
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Chen ZY, Law WI, Yao XQ, Lau CW, Ho WK, Huang Y. Inhibitory effects of purified green tea epicatechins on contraction and proliferation of arterial smooth muscle cells. Acta Pharmacol Sin 2000; 21:835-40. [PMID: 11501167] [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 The present study was aimed to examine the vasorelaxant and antiproliferative responses to purified green tea epicatechin mixture, (-)epicatechin and (-)epigallocatechin gallate on rat arterial smooth muscle cells. METHODS Changes in isometric force were measured by Grass force transducer and effects on cell proliferation were evaluated using [3H]thymidine incorporation assay. RESULTS Epicatechin mixture, (-)epicatechin and (-)epigallocatechin gallate, which we isolated and purified from jasmine green tea, concentration-dependently, reduced the contractile response to phenylephrine in rat isolated aortic rings with (-)epigallocatechin gallate being more effective. These three agents also inhibited [3H]thymidine incorporation into DNA in cultured rat aortic smooth muscle cells in a concentration-dependent manner. CONCLUSION The purified epicatechin derivatives from jasmine green tea relaxed the isolated rat arteries preconstricted by phenylephrine and inhibited aortic smooth muscle cell proliferation.
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Affiliation(s)
- Z Y Chen
- Departments of Biochemistry and Department of Physiology, Faculty of Medicine, Chinese University of Hong Kong, Shatin, Hong Kong, China
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47
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Huang Y, Yao XQ, Chan FL, Lau CW, Chan NW, Chen ZY. Abolition of endothelium-dependent relaxation in the rat aorta by tetraoctylammonium ions. Naunyn Schmiedebergs Arch Pharmacol 2000; 362:152-9. [PMID: 10961378 DOI: 10.1007/s002100000278] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Quaternary ammonium ions are common pharmacological probes used to study the kinetic properties of K+ channels in smooth muscle cells. On the other hand, some ammonium compounds cause vasorelaxation through unknown mechanisms. The main aim of this study was to examine a unique role of endothelium in the vascular response to tetraoctylammonium ions (TOA+) in the isolated rat aorta. Changes in contractile force were measured by force transducers and total tissue content of cGMP was measured by radioimmunoassay. Endothelial cytosolic Ca2+ ([Ca2+]i) was assessed by laser scanning confocal microscopy.
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MESH Headings
- Acetylcholine/pharmacology
- Animals
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/metabolism
- Calcimycin/pharmacology
- Calcium/metabolism
- Cations/pharmacology
- Cells, Cultured
- Cyclic GMP/metabolism
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/physiology
- Enzyme Inhibitors/pharmacology
- In Vitro Techniques
- Indoles/pharmacology
- Male
- Microscopy, Confocal
- Muscle Relaxation/drug effects
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Nitric Oxide Synthase/antagonists & inhibitors
- Nitric Oxide Synthase Type III
- Nitroarginine/pharmacology
- Quaternary Ammonium Compounds/pharmacology
- Rats
- Rats, Sprague-Dawley
- Vasodilator Agents/pharmacology
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Affiliation(s)
- Y Huang
- Department of Physiology, The Chinese University of Hong Kong, Shatin.
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48
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Abstract
The effects of purified baicalin and baicalein from the traditional Chinese herb, Huangqin, on contractions induced by phenylephrine, U46619, and high extracellular K+ were investigated in isolated rat mesenteric arteries. Both baicalin (1-100 microM) and baicalein (1-50 microM) potentiated the contractile response to phenylephrine in a concentration-related manner. Both flavonoids (10 microM) also enhanced the U46619- or 40 mM K+-induced contractions. Baicalein (100-300 microM) reduced the phenylephrine-induced tone. Prazosin at 1 microM did not affect U46619-induced contraction in the absence and presence of baicalein or baicalin. Neither baicalin (1-100 microM) nor baicalein (1-100 microM) affected the basal tension. Removal of the functional endothelium abolished the potentiating effects of baicalin and baicalein in arteries preconstricted by both constrictors. Pretreatment of endothelium-intact rings with 100 microM N(G)-nitro-L-arginine also potentiated phenylephrine- or U46619-induced contraction but completely inhibited the effects of baicalin and baicalein. Pretreatment with 1 mM L-arginine reversed the enhancing effect of baicalin but not of baicalein on phenylephrine-evoked contraction. Pretreatment with 10 microM baicalin or 10 microM baicalein significantly reduced the endothelium-dependent relaxation induced by acetylcholine or ionomycin. These results indicate that both baicalin and baicalein potentiated the evoked contractile response, likely through inhibition of nitric oxide formation and/or release in the endothelium.
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Affiliation(s)
- S Y Tsang
- Department of Physiology, Chinese University of Hong Kong, Shatin
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49
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Abstract
The present study was intended to examine the relaxant effects of berberine in rat isolated mesenteric arteries. Berberine produced a rightward shift of the concentration-response curve to phenylephrine and significantly reduced the maximal contractile response to phenylephrine. Berberine (10(-7)-3x10(-5) M) also relaxed the phenylephrine- and 9,11-dideoxy-11alpha, 9alpha-epoxy-methanoprostaglandin F(2alpha)-precontracted arteries with respective IC(50) values of 1.48+/-0.16x10(-6) and 2.23+/-0. 22x10(-6) M. Removal of a functional endothelium significantly attenuated the berberine-induced relaxation (IC(50): 4.73+/-0. 32x10(-6) M) without affecting the maximum relaxant response. Pretreatment with N(G)-nitro-L-arginine methyl ester (L-NAME) or methylene blue reduced the relaxant effect of berberine, and L-arginine (10(-3) M) partially antagonized the effect of L-NAME. In contrast, pretreatment with 10(-6) M glibenclamide or 10(-5) M indomethacin had no effect. Berberine (10(-5) M) reduced over by 50% the transient contraction induced by caffeine or phenylephrine in endothelium-denuded rings bathed in Ca(2+)-free Krebs solution. Pretreatment with putative K(+) channel blockers, such as tetrapentylammonium ions (1-3x10(-6) M), 4-aminopyridine (10(-3) M), or Ba(2+) (3x10(-4) M), significantly attenuated the berberine-induced relaxation in endothelium-denuded arteries. In contrast, tetraethylammonium ions (3x10(-3) M), charybdotoxin (10(-7) M) or glibenclamide (10(-6) M) were without effect. Berberine reduced the high-K(+)-induced sustained contraction and the relaxant response to berberine was greater in rings with endothelium (IC(50): 4.41+/-0.47x10(-6) M) than in those without endothelium (IC(50): 8.73+/-0.74x10(-6) M). However, berberine (10(-6)-10(-4) M) did not affect the high-K(+)-induced increase of intracellular [Ca(2+)] in cultured aortic smooth muscle cells. Berberine did not affect active phorbol ester-induced contraction in Ca(2+)-free Krebs solution. In addition, berberine inhibited proliferation of cultured rat aortic smooth muscle cells with an IC(50) of 2.3+/-0.43x10(-5) M. These findings suggest that berberine could act at both endothelium and the underlying vascular smooth muscle to induce relaxation. Nitric oxide from endothelium may account primarily for the berberine-induced endothelium-dependent relaxation, while activation of tetrapentylammonium-, 4-aminopyridine- and Ba(2+)-sensitive K(+) channels, inhibition of intracellular Ca(2+) release from caffeine-sensitive pools, or a direct relaxant effect, is likely responsible for the berberine-induced endothelium-independent relaxation. Mechanisms related to either Ca(2+) influx or protein kinase C activation may not be involved. Both vasorelaxant and antiproliferative effects may contribute to a long-term benefit of berberine in the vascular system.
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MESH Headings
- Animals
- Aorta/cytology
- Berberine/pharmacology
- Calcimycin/pharmacology
- Calcium/metabolism
- Calcium/pharmacology
- Cell Division/drug effects
- Cells, Cultured
- Dose-Response Relationship, Drug
- In Vitro Techniques
- Male
- Mesenteric Artery, Superior/drug effects
- Mesenteric Artery, Superior/physiology
- Methylene Blue/pharmacology
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- NG-Nitroarginine Methyl Ester/pharmacology
- Phorbol Esters/pharmacology
- Potassium/pharmacology
- Potassium Channel Blockers
- Rats
- Rats, Sprague-Dawley
- Vasoconstriction/drug effects
- Vasodilation/drug effects
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Affiliation(s)
- W H Ko
- Department of Physiology, Faculty of Medicine, Chinese University of Hong Kong, Shatin, Hong Kong, People's Republic of China
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Huang Y, Chan NW, Lau CW, Yao XQ, Chan FL, Chen ZY. Involvement of endothelium/nitric oxide in vasorelaxation induced by purified green tea (-)epicatechin. Biochim Biophys Acta 1999; 1427:322-8. [PMID: 10216249 DOI: 10.1016/s0304-4165(99)00034-3] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The present study investigated the involvement of endothelial nitric oxide in relaxation induced by purified green tea (-)epicatechin in rat isolated mesenteric arteries. (-)Epicatechin caused both endothelium-dependent and -independent relaxation. NG-Nitro-L-arginine methyl ester (L-NAME, 100 microM) and methylene blue (10 microM) significantly attenuated (-)epicatechin-induced relaxation in endothelium-intact tissues. L-Arginine (1 mM) partially antagonized the effect of L-NAME. (-)Epicatechin-induced relaxation was inhibited by Rp-guanosine 3',5'-cyclic monophosphothioate triethylamine. In contrast, indomethacin and glibenclamide had no effect. (-)Epicatechin (100 microM) significantly increased the tissue content of cyclic GMP and NG-nitro-L-arginine (100 microM) or removal of the endothelium abolished this increase. (-)Epicatechin (100 microM) induced an increase in intracellular Ca2+ levels in cultured human umbilical vein endothelial cells. Iberiotoxin at 100 nM attenuated (-)epicatechin-induced relaxation in endothelium-intact arteries and this effect was absent in the presence of 100 microM L-NAME. In summary, (-)epicatechin-induced endothelium-dependent relaxation is primarily mediated by nitric oxide and partially through nitric oxide-dependent activation of iberiotoxin-sensitive K+ channels. In addition, there may be a causal link between increased Ca2+ levels and nitric oxide release in response to (-)epicatechin.
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Affiliation(s)
- Y Huang
- Department of Physiology, Chinese University of Hong Kong, Faculty of Medicine, Shatin, Hong Kong.
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