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Zheng J, Zhang T, Han S, Liu C, Liu M, Li S, Li J. Activin A improves the neurological outcome after ischemic stroke in mice by promoting oligodendroglial ACVR1B-mediated white matter remyelination. Exp Neurol 2020; 337:113574. [PMID: 33345977 DOI: 10.1016/j.expneurol.2020.113574] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/08/2020] [Accepted: 12/16/2020] [Indexed: 02/07/2023]
Abstract
Activin A plays important roles in ischemic injury and white matter remyelination, but its mechanisms are unclear. In this study, the adult male C57BL/6 J mice were used to establish the model of 1 h middle cerebral artery occlusion/reperfusion (MCAO/R) 1 d to 28 d-induced ischemic stroke in vivo. We found that the neurological outcome was positively correlated with the levels of myelin associated proteins (include MAG, CNPase, MOG and MBP, n = 6 per group) both in corpus callosum and internal capsule of mice with ischemic stroke. The dynamic changes of Luxol fast blue (LFB) staining intensity, oligodendrocyte (CC1+) and proliferated oligodendrocyte precursor (Ki67+/PDGFRα+) cell numbers indicated demyelination and spontaneous remyelination occurred in the corpus callosum of mice after 1 h MCAO/R 1 d-28 d (n = 6 per group). Activin receptor type I (ACVR1) inhibitor SB431542 aggregated neurological deficits, and reduced MAG, MOG and MBP protein levels of mice with ischemic stroke (n = 6 per group). Meanwhile, recombinant mouse (rm) Activin A enhanced the neurological function recovery, MAG, MOG and MBP protein levels of mice with 1 h MCAO/R 28 d. In addition, the injection of AAV-based ACVR1B shRNA with Olig2 promoter could reverse rmActivin A-induced the increases of CC1+ cell number, LFB intensity, MAG, MOG and MBP protein levels in the corpus callosum (n = 6 per group), and neurological function recovery (n = 10 per group) of mice with 1 h MCAO/R 28 d. These results suggested that Activin A improves the neurological outcome through promoting oligodendroglial ACVR1B-mediated white matter remyelination of mice with ischemic stroke, which may provide a potential therapeutic strategy for ischemic stroke.
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Affiliation(s)
- Jiayin Zheng
- Department of Neurobiology and Center of Stroke, Beijing Institute for Brain Disorders, School of Basic Medical Science, Capital Medical University, Beijing 100069, PR China
| | - Teng Zhang
- Department of Laboratory Animal Sciences, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Song Han
- Department of Neurobiology and Center of Stroke, Beijing Institute for Brain Disorders, School of Basic Medical Science, Capital Medical University, Beijing 100069, PR China
| | - Cui Liu
- Department of Neurobiology and Center of Stroke, Beijing Institute for Brain Disorders, School of Basic Medical Science, Capital Medical University, Beijing 100069, PR China
| | - Meilian Liu
- Department of Neurobiology and Center of Stroke, Beijing Institute for Brain Disorders, School of Basic Medical Science, Capital Medical University, Beijing 100069, PR China
| | - Shujuan Li
- Department of Neurology, Beijing Chao-Yang Hospital, Capital Medical University, Beijing 100020, PR China.
| | - Junfa Li
- Department of Neurobiology and Center of Stroke, Beijing Institute for Brain Disorders, School of Basic Medical Science, Capital Medical University, Beijing 100069, PR China.
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Zhang YR, Wu YF, Wang H, Lin XM, Zhang XM. [Role of microRNA-17-5p in the pathogenesis of pediatric nephrotic syndrome and related mechanisms]. ZHONGGUO DANG DAI ER KE ZA ZHI = CHINESE JOURNAL OF CONTEMPORARY PEDIATRICS 2020; 22:958-963. [PMID: 32933626 PMCID: PMC7499452 DOI: 10.7499/j.issn.1008-8830.2003329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 05/25/2020] [Indexed: 06/11/2023]
Abstract
OBJECTIVE To study the role of microRNA-17-5p (miR-17-5p) in the pathogenesis of pediatric nephrotic syndrome (NS) and its effect on renal podocyte apoptosis via the activin A (ActA)/Smads pathway. METHODS An analysis was performed on 55 children with NS (NS group) who were admitted from March 2018 to March 2019. Fifty healthy children who underwent physical examination during the same period of time were enrolled as the control group. The mRNA expression of miR-17-5p in peripheral blood was measured and compared between the two groups. Human renal podocytes were transfected with antisense oligonucleotide recombinant plasmid containing miR-17-5p (inhibition group) or control vector containing nonsense random sequence (negative control group), and untreated human renal podocytes were used as the blank group. These groups were compared in terms of cell apoptosis and the mRNA and protein expression of miR-17-5p, ActA, and Smads after transfection. RESULTS The NS group had a significantly higher level of miR-17-5p in peripheral blood than the control group (P<0.001). Compared with the blank and negative control groups, the inhibition group had significantly lower apoptosis rate and relative mRNA expression of miR-17-5p and significantly higher relative mRNA and protein expression of ActA, Smad2, and Smad3 (P<0.001). CONCLUSIONS There is an increase in the content of miR-17-5p in peripheral blood in children with NS. Low expression of miR-17-5p can inhibit the apoptosis of human renal podocytes, which may be associated with the upregulation of the mRNA and protein expression of ActA, Smad2 and Smad3.
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Affiliation(s)
- Yan-Rui Zhang
- Department of Pediatric Gastroenterology and Nephrology, Binzhou Medical University Hospital, Binzhou, Shandong 256603, China.
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Wang JQ, Dong Y, Li SJ, Pan CL, Liu HY, Wang YK, Xu L, Yang JH, Cui YX, He JT, Mang J, Xu ZX. Knockdown of microRNA-17-5p Enhances the Neuroprotective Effect of Act A/Smads Signal Loop After Ischemic Injury. Neurochem Res 2019; 44:1807-1817. [PMID: 31093905 DOI: 10.1007/s11064-019-02815-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 04/19/2019] [Accepted: 05/09/2019] [Indexed: 01/22/2023]
Abstract
Cerebral ischemic injury is a leading cause of human mortality and disability, seriously threatening human health in the world. Activin A (Act A), as a well-known neuroprotective factor, could alleviate ischemic brain injury mainly through Act A/Smads signaling. In our previous study, a noncanonical Act A/Smads signal loop with self-amplifying property was found, which strengthened the neuroprotective effect of Act A. However, this neuroprotective effect was limited due to the self-limiting behavior mediated by Smad anchor for receptor activation (SARA) protein. It was reported that microRNA-17-5p (miR-17-5p) could suppress the expression of SARA in esophageal squamous cell carcinoma. Thus we proposed that knockdown of miR-17-5p could strengthen the neuroprotective effect of Act A/Smads signal loop through SARA. To testify this hypothesis, oxygen-glucose deficiency (OGD) was introduced to highly differentiated rattus pheochromocytoma (PC12) cells. After the transfection of miR-17-5p mimic or inhibitor, the activity of Act A signal loop was quantified by the expression of phosphorylated Smad3. The results showed that suppression of miR-17-5p up-regulated the expression of SARA protein, which prolonged and strengthened the activity of Act A signaling through increased phosphorylation of downstream Smad3 and accumulation of Act A ligand. Further luciferase assay confirmed that SARA was a direct target gene of miR-17-5p. These practical discoveries will bring new insight on the endogenous neuroprotective effects of Act A signal loop by interfering a novel target: miR-17-5p.
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Affiliation(s)
- Jiao-Qi Wang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Yue Dong
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Si-Jia Li
- Department of Clinical Medicine, College of Clinical Medicine, Bethune Medicine Institute, Jilin University, 828 Xinmin Street, Changchun, 130012, China
| | - Cheng-Liang Pan
- Department of Clinical Medicine, College of Clinical Medicine, Bethune Medicine Institute, Jilin University, 828 Xinmin Street, Changchun, 130012, China
| | - Hong-Yu Liu
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Yu-Kai Wang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Lei Xu
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Jia-Hui Yang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Yun-Xia Cui
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Jin-Ting He
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Jing Mang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China
| | - Zhong-Xin Xu
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun, 130012, China.
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Neuroprotective Effects of Bioactive Compounds and MAPK Pathway Modulation in "Ischemia"-Stressed PC12 Pheochromocytoma Cells. Brain Sci 2018; 8:brainsci8020032. [PMID: 29419806 PMCID: PMC5836051 DOI: 10.3390/brainsci8020032] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/24/2018] [Accepted: 02/02/2018] [Indexed: 02/08/2023] Open
Abstract
This review surveys the efforts taken to investigate in vitro neuroprotective features of synthetic compounds and cell-released growth factors on PC12 clonal cell line temporarily deprived of oxygen and glucose followed by reoxygenation (OGD/R). These cells have been used previously to mimic some of the properties of in vivo brain ischemia-reperfusion-injury (IRI) and have been instrumental in identifying common mechanisms such as calcium overload, redox potential, lipid peroxidation and MAPKs modulation. In addition, they were useful for establishing the role of certain membrane penetrable cocktails of antioxidants as well as potential growth factors which may act in neuroprotection. Pharmacological mechanisms of neuroprotection addressing modulation of the MAPK cascade and increased redox potential by natural products, drugs and growth factors secreted by stem cells, in either undifferentiated or nerve growth factor-differentiated PC12 cells exposed to ischemic conditions are discussed for future prospects in neuroprotection studies.
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Xu B, Xu X, Zhang C, Zhang Y, Wu G, Yan M, Jia M, Xie T, Jia X, Wang P, Lei H. Synthesis and protective effect of new ligustrazine-vanillic acid derivatives against CoCl 2-induced neurotoxicity in differentiated PC12 cells. Chem Cent J 2017; 11:20. [PMID: 28293281 PMCID: PMC5331027 DOI: 10.1186/s13065-017-0250-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 02/21/2017] [Indexed: 01/07/2023] Open
Abstract
Ligustrazine-vanillic acid derivatives had been reported to exhibit promising neuroprotective activities. In our continuous effort to develop new ligustrazine derivatives with neuroprotective effects, we attempted the synthesis of several ligustrazine-vanillic acid amide derivatives and screened their protective effect on the injured PC12 cells damaged by CoCl2. The results showed that most of the newly synthesized derivatives exhibited higher activity than ligustrazine, of which, compound VA-06 displayed the highest potency with EC50 values of 17.39 ± 1.34 μM. Structure-activity relationships were briefly discussed.Graphical abstractNew series of ligustrazine-vanillic acid amide derivatives were synthesized and evaluated for their protective effect on the injured PC12 cells damaged by CoCl2. VA-06 was found to be the most active one.
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Affiliation(s)
- Bing Xu
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Xin Xu
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Chenze Zhang
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Yuzhong Zhang
- Department of Pathology, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - GaoRong Wu
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Mengmeng Yan
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Menglu Jia
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Tianxin Xie
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Xiaohui Jia
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Penglong Wang
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
| | - Haimin Lei
- School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China
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Xue LX, Xu ZH, Wang JQ, Cui Y, Liu HY, Liang WZ, Ji QY, He JT, Shao YK, Mang J, Xu ZX. Activin A/Smads signaling pathway negatively regulates Oxygen Glucose Deprivation-induced autophagy via suppression of JNK and p38 MAPK pathways in neuronal PC12 cells. Biochem Biophys Res Commun 2016; 480:355-361. [PMID: 27769861 DOI: 10.1016/j.bbrc.2016.10.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 10/16/2016] [Indexed: 10/20/2022]
Abstract
Activin A (Act A), a member of the transforming growth factor-beta (TGF-β), reduces neuronal apoptosis during cerebral ischemia through Act A/Smads signaling pathway. However, little is known about the effect of Act A/Smads pathway on autophagy in neurons. Here, we found that oxygen-glucose deprivation (OGD)-induced autophagy was suppressed by exogenous Act A in a concentration-dependent manner and enhanced by Act A/Smads pathway inhibitor (ActRIIA-Ab) in neuronal PC12 cells. These results indicate that Act A/Smads pathway negatively regulates autophagy in OGD-treated PC12 cells. In addition, we found that c-Jun N-terminal kinase (JNK) and p38 mitogen-activated protein (MAP) kinase pathways are involved in the OGD-induced autophagy. The activation of JNK and p38 MAPK pathways in OGD-treated PC12 cells was suppressed by exogenous Act A and enhanced by ActRIIA-Ab. Together, our results suggest that Act A/Smads signaling pathway negatively regulates OGD-induced autophagy via suppression of JNK and p38 MAPK pathways in neuronal PC12 cells.
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Affiliation(s)
- Long-Xing Xue
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Zhong-Hang Xu
- Clinical Medicine of Norman Bethune Medical Department, Jilin University, Changchun 130012, Jilin Province, China
| | - Jiao-Qi Wang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Yang Cui
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Hong-Yu Liu
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Wen-Zhao Liang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Qiu-Ye Ji
- Research Center, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Jin-Ting He
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Yan-Kun Shao
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China
| | - Jing Mang
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China.
| | - Zhong-Xin Xu
- Department of Neurology, China-Japan Union Hospital, Jilin University, 126 Xiantai Street, Changchun 130012, China.
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Wang Q, Yin J, Wang S, Cui D, Lin H, Ge M, Dai Z, Xie L, Si J, Ma K, Li L, Zhao L. Effects of activin A and its downstream ERK1/2 in oxygen and glucose deprivation after isoflurane-induced postconditioning. Biomed Pharmacother 2016; 84:535-543. [PMID: 27693962 DOI: 10.1016/j.biopha.2016.09.075] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/17/2016] [Accepted: 09/20/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Isoflurane postconditioning (ISPOC) plays a neuroprotection role in the brain. Previous studies confirmed that isoflurane postconditioning can provide better protection than preconditioning in acute hypoxic-ischemic brain damage, such as acute craniocerebral trauma and ischemic stroke. Numerous studies have reported that activin A can protect rat's brain from cell injury. However, whether activin A and its downstream ERK1/2 were involved in isoflurane postconditioning-induced neuroprotection is unknown. METHODS A total of 80 healthy Sprague-Dawley rats weighing 50-70g were randomly divided into 10 groups of 8: normal control, oxygen and glucose deprivation (OGD), 1.5% ISPOC, 3.0% ISPOC, 4.5% ISPOC, blocker of activin A (SB431542), blocker of ERK1/2 (U0126), 3.0% ISPOC+SB431542, 3.0% ISPOC+U0126, and vehicle (dimethyl sulfoxide(DMSO)) group. Blockers (SB431542 and U0126) were used in each concentration of isoflurane before OGD. Hematoxylin-eosin staining, 2,3,5-triphenyl tetrazolium chloride staining, and propidium iodide (PI) staining were conducted to assess the reliability in the brain slices. Immunofluorescence, Western blot, and quantitative real-time PCR(Q-PCR) were performed to validate the protein expression levels of activin A, Smad2/3, P-Smad2/3, ERK1/2, and phosphorylation ERK1/2 (P-ERK1/2). RESULTS The number of damaged neurons and mean fluorescence intensity(MFI) of PI staining increased, but formazan generation, expression levels of activin A and P-ERK1/2 protein, and mRNA synthesis level of activin A decreased in the OGD group compared with the normal control group (p<0.05). The number of damaged neurons and MFI of PI staining decreased, but formazan production, expression levels of activin A, P-Smad2/3, and P-ERK1/2, and mRNA synthesis level of activin A increased significantly in the 1.5% ISPOC and 3.0% ISPOC groups (p<0.05) compared with the OGD group. The result in the 4.5% ISPOC group, was completely opposite to the 1.5% ISPOC and 3.0% ISPOC groups. The number of damage neuron and MFI of PI staining increased, but formazan production, expression levels of activin A, P-Smad2/3, and P-ERK1/2, and mRNA synthesis level of activin A decreased in the 4.5% ISPOC group. However, the expression levels of activin A, P-Smad2/3, and P-ERK1/2, and mRNA synthesis level of activin A in the 4.5% ISPOC group were higher than the OGD group (p<0.05). The other results were compared between the SB431542 group/the U0126 group and 3.0% ISPOC group. The MFI of PI staining increased, but the expression levels of activin A, P-Smad2/3, and P-ERK1/2 decreased (p<0.05). The expression level of ERK1/2 protein in all groups exhibited no change (p>0.05). CONCLUSION Results of this study showed that 3.0% concentration of isoflurane postconditioning provided better neuroprotection than 1.5% and 4.5% concentrations of isoflurane. Activin A/Smad 2/3 and activin A/ERK1/2 signaling pathway may be involved in ISPOC-induced neuroprotection.
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Affiliation(s)
- Qin Wang
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China.
| | - Jiangwen Yin
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China.
| | - Sheng Wang
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China.
| | - Di Cui
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China
| | - Hong Lin
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China
| | - Mingyue Ge
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China
| | - Zhigang Dai
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China
| | - Liping Xie
- Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Shihezi University, Shihezi 832002, China
| | - Junqiang Si
- Department of Physiology, School of Medicine, Shihezi University and the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Shihezi 832002, China
| | - Ketao Ma
- Department of Physiology, School of Medicine, Shihezi University and the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Shihezi 832002, China
| | - Li Li
- Department of Physiology, School of Medicine, Shihezi University and the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Shihezi 832002, China
| | - Lei Zhao
- Department of Physiology, School of Medicine, Shihezi University and the Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Shihezi 832002, China
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Wu S, Yue Y, Peng A, Zhang L, Xiang J, Cao X, Ding H, Yin S. Myricetin ameliorates brain injury and neurological deficits via Nrf2 activation after experimental stroke in middle-aged rats. Food Funct 2016; 7:2624-34. [PMID: 27171848 DOI: 10.1039/c6fo00419a] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The aim of our study was to investigate the protective effects and underlying mechanisms of myricetin, a bioactive food compound, on brain injury and neurological deficits after ischemic stroke. Treatment of myricetin significantly attenuated oxygen-glucose deprivation (OGD)-induced cell death in SHSY5Y cells in vitro. In a rat model of cerebral ischemia, myricetin was administered intragastrically at 2 h before and every day after middle cerebral artery occlusion (MCAO). The effects of myricetin were evaluated by various biochemical assays and neurobehavioral tests. Treatment with myricetin resulted in decreased infarction volume, reduced neuronal loss as well as lessened production of reactive oxygen species (ROS) and malondialdehyde following MCAO. We also found evidence that myricetin treatment could enhance the activity of antioxidant enzymes and mitochondrial function. Meanwhile, myricetin treatment reversed the suppression of Nrf2 nuclear translocation, and increased HO-1 expression in the ipsilateral ischemic brain and in the normal brain. Moreover, our results suggested that myricetin treatment resulted in significant improvement in neurological function. In conclusion, treatment with myricetin attenuates brain injury and neurological deficits in a rat model of cerebral ischemia via improvement of mitochondrial function and activation of the Nrf2 pathway.
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Affiliation(s)
- Shuangchan Wu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, Wuhan University School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei, P. R. China.
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Zhang W, Zhang Z, Wu L, Qiu Y, Lin Y. Suppression of Glutamate Carboxypeptidase II Ameliorates Neuronal Apoptosis from Ischemic Brain Injury. J Stroke Cerebrovasc Dis 2016; 25:1599-1605. [PMID: 27068862 DOI: 10.1016/j.jstrokecerebrovasdis.2015.10.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 09/22/2015] [Accepted: 10/21/2015] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND Ischemia stroke is a destructive cerebrovascular disease and a major cause of death and lifelong neurological disability. N-Acetyl-l-aspartyl-l-glutamate (NAAG) is a neurotransmitter in the mammalian brain and involves a variety of physiological and pathological functions including ischemia brain injury. Full understanding of the functions of NAAG peptidase (GCPII) in the pathogenesis of ischemia brain injury is extremely valuable for effective therapies to ischemia stroke. METHODS The expressions of GCPII and NAAG agonist metabotropic glutamate receptor (mGluR3) and TGFb1 were examined by real-time polymerase chain reaction and western blot. Moreover, GCPII knockdown cells were constructed using lentivirus-mediated transfection. Function and molecular mechanisms of GCPII knockdown on apoptosis induced from hypoxic-ischemic-induced injury in neuronal cells were analyzed. RESULTS In this study, we found that the expressions of GCPII and mGluR3 were upregulated in CoCl2-induced hypoxia environment in neuronal cells. Moreover, knockdown of GCPII in neuronal cells ameliorated apoptosis from hypoxic-ischemic-induced injury through suppressing expressions of caspase 3 and caspase 9. CONCLUSIONS Our results highlighted the roles of GCPII in the ischemia brain injury, and might provide an important target in therapeutic implications.
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Affiliation(s)
- Weiqiao Zhang
- Department of Neurosurgery, Yuyao People's Hospital of Zhejiang Province, Yuyao City, Zhejiang, China.
| | - Zhijie Zhang
- Department of Neurosurgery, Yuyao People's Hospital of Zhejiang Province, Yuyao City, Zhejiang, China
| | - Liping Wu
- Department of Neurosurgery, Yuyao People's Hospital of Zhejiang Province, Yuyao City, Zhejiang, China
| | - Yongming Qiu
- Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao-tong University, Shanghai, China
| | - Yingying Lin
- Department of Neurosurgery, Renji Hospital, School of Medicine, Shanghai Jiao-tong University, Shanghai, China
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Wang JQ, Liang WZ, Cui Y, He JT, Liu HY, Wang Y, Xue LX, Ji QY, Shi W, Shao YK, Mang J, Xu ZX. Noncanonical Activin A Signaling in PC12 Cells: A Self-Limiting Feedback Loop. Neurochem Res 2015; 41:1073-84. [DOI: 10.1007/s11064-015-1797-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 12/08/2015] [Accepted: 12/09/2015] [Indexed: 12/14/2022]
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Wu S, Yue Y, Tian H, Tao L, Wang Y, Xiang J, Wang S, Ding H. Tramiprosate protects neurons against ischemic stroke by disrupting the interaction between PSD95 and nNOS. Neuropharmacology 2014; 83:107-17. [DOI: 10.1016/j.neuropharm.2014.04.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Revised: 04/08/2014] [Accepted: 04/11/2014] [Indexed: 12/27/2022]
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Linying Z, Wei W, Minxia W, Wenmin Z, Liangcheng Z. Neuroprotective effects of neuregulin-1 ß on oligodendrocyte type 2 astrocyte progenitors following oxygen and glucose deprivation. Pediatr Neurol 2014; 50:357-62. [PMID: 24529326 DOI: 10.1016/j.pediatrneurol.2013.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 11/27/2013] [Accepted: 12/07/2013] [Indexed: 11/17/2022]
Abstract
BACKGROUND Hypoxic-ischemic brain injury in neonates, especially in premature infants, is one of the main contributors to the mortality of newborns and can cause nervous system dysfunction in children. The major pathogenesis seems to be cerebral ischemia/reperfusion in the immature white matter that preferentially targets vulnerable premyelinating oligodendrocytes. OBJECTIVES The goal of this study was to culture oligodendrocyte type 2 astrocyte cells in an oxygen and glucose deprivation environment to simulate ischemia injury and examine the cellular and molecular mechanisms involved in the neuroprotective effects of neuregulin-1ß on ischemia-induced immature oligodendrocytes. METHODS Oligodendrocyte type 2 astrocyte cells were cultured from neonatal Sprague-Dawley rat cerebra. The cells were divided into two groups: one was subjected to oxygen and glucose deprivation for 9 hours and the other was treated with 50 ng/mL or 100 ng/mL neuregulin-1β during oxygen and glucose deprivation. Cell survival was determined by Trypan Blue staining and cell apoptosis were observed by fluorescein isothiocyanate-Annexin V and propidium iodide double staining. To study if the PI3K-Akt signaling pathway was involved in the mechanism of protective effect of neuregulin-1ß, Western blot analysis was used to quantitative the changes of protein. RESULTS Treatment with neuregulin-1ß within the period of oxygen and glucose deprivation significantly increased cell survival and also resulted in a significant decrease in cell apoptosis. The neuroprotective effects of neuregulin-1ß were prevented by treatment with Ly294002, an inhibitor of the phosphatidylinositol-3-kinase/Akt pathway. CONCLUSIONS These results suggest that neuregulin-1ß could protect the oligodendrocyte type 2 astrocyte progenitors against hypoxic injury, and the mechanism may be associated with the PI3K-Akt signaling pathway.
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Affiliation(s)
- Zhou Linying
- Department of Pathology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China; Centre of Neuroscience, Fujian Medical University, Fuzhou, China
| | - Wang Wei
- Centre of Neuroscience, Fujian Medical University, Fuzhou, China.
| | - Wu Minxia
- Department of Pathology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Zhang Wenmin
- Department of Pathology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, China
| | - Zhang Liangcheng
- Department of Anaesthesiology, The Affiliated Union Hospital, Fujian Medical University, Fuzhou, China.
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