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Ghosh B, Datta A, Gupta V, Sodnar B, Sarkar A, Singh U, Raut S, Suthar P, Thongire V, Sarmah D, Kaur H, Borah A, Saraf S, Bhattacharya P. Simvastatin exerts neuroprotective effects post-stroke by ameliorating endoplasmic reticulum stress and regulating autophagy/apoptosis balance through pAMPK/LC3B/ LAMP2 axis. Exp Neurol 2024; 381:114940. [PMID: 39214348 DOI: 10.1016/j.expneurol.2024.114940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 07/28/2024] [Accepted: 08/26/2024] [Indexed: 09/04/2024]
Abstract
Statins have evident neuroprotective role in acute ischemic stroke(AIS). The pleiotropic effect by which statin exerts neuroprotective effects, needs to be explored for considering it as one of the future adjunctive therapies in AIS. Endoplasmic reticulum(ER) assists cellular survival by reducing protein aggregates during ischemic conditions. ER-stress mediated apoptosis and autophagy are predominant reasons for neuronal death in AIS. Statin exerts both anti-apoptotic and anti-autophagic effect in neurons under ischemic stress. Although the influence of statin on autophagic neuroprotection has been reported with contradictory results. Thus, in our study we have attempted to understand its influence on autophagic protection while inhibiting upregulation of autophagic death(autosis). Previously we reported, statin can alleviate apoptosis via modulating cardiolipin mediated mitochondrial dysfunction. However, the clearance of damaged mitochondria is essential for prolonged cell survival. In our study, we tried to decipher the mechanism by which statin leads to neuronal survival by the mitophagy mediated cellular clearance. Simvastatin was administered to Sprague Dawley(SD) rats both as prophylaxis and treatment. The safety and efficacy of the statin was validated by assessment of infarct size and functional outcome. A reduction in oxidative and ER-stress were observed in both the prophylactic and treatment groups. The influence of statin on autophagy/apoptosis balance was evaluated by molecular assessment of mitophagy and cellular apoptosis. Statin reduces the post-stroke ER-stress and predominantly upregulated autophagolysosome mediated mitophagy than apoptotic cell death by modulating pAMPK/LC3B/LAMP2 axis. Based on the above findings statin could be explored as an adjunctive therapy for AIS in future.
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Affiliation(s)
- Bijoyani Ghosh
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Aishika Datta
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Vishal Gupta
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Babasaheb Sodnar
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Abhishek Sarkar
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Upasna Singh
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Swapnil Raut
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Pramod Suthar
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Vrushali Thongire
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Deepaneeta Sarmah
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Harpreet Kaur
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Anupom Borah
- Cellular and Molecular Neurobiology Laboratory, Department of Life Science and Bioinformatics, Assam University, Silchar, Assam, India
| | - Shailendra Saraf
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India
| | - Pallab Bhattacharya
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gandhinagar, Gujarat, India.
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Ji Y, Ren J, Qian Y, Li J, Liu H, Yao Y, Sun J, Khanna R, Sun L. Aβ25-35-induced autophagy and apoptosis are prevented by the CRMP2-derived peptide ST2-104 (R9-CBD3) via a CaMKKβ/AMPK/mTOR signaling hub. PLoS One 2024; 19:e0309794. [PMID: 39325788 PMCID: PMC11426444 DOI: 10.1371/journal.pone.0309794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 08/19/2024] [Indexed: 09/28/2024] Open
Abstract
We previously reported that the peptide ST2-104 (CBD3, for Ca2+ channel-binding domain 3), derived from the collapsin response mediator protein 2 (CRMP2)-a cytosolic phosphoprotein, protects neuroblastoma cells against β-amyloid (Aβ) peptide-mediated toxicity through engagement of a phosphorylated CRMP2/NMDAR pathway. Abnormal aggregation of Aβ peptides (e.g., Aβ25-35) leads to programmed cell death (apoptosis) as well autophagy-both of which contribute to Alzheimer's disease (AD) progression. Here, we asked if ST2-104 affects apoptosis and autophagy in SH-SY5Y neuroblastoma challenged with the toxic Aβ25-35 peptide and subsequently mapped the downstream signaling pathways involved. ST2-104 protected SH-SY5Y cells from death following Aβ25-35 peptide challenge by reducing apoptosis and autophagy as well as limiting excessive calcium entry. Cytotoxicity of SHY-SY5Y cells challenged with Aβ25-35 peptide was blunted by ST2-104. The autophagy activator Rapamycin blunted the anti-apoptotic activity of ST2-104. ST2-104 reversed Aβ25-35-induced apoptosis via inhibiting Ca2+/CaM-dependent protein kinase kinase β (CaMKKβ)-mediated autophagy, which was partly enhanced by STO-609 (an inhibitor of CaMKKβ). ST2-104 attenuated neuronal apoptosis by inhibiting autophagy through a CaMKKβ/AMPK/mTOR signaling hub. These findings identify a mechanism whereby, in the face of Aβ25-35, the concerted actions of ST2-104 leads to a reduction in intracellular calcium overload and inhibition of the CaMKKβ/AMPK/mTOR pathway resulting in attenuation of autophagy and cellular apoptosis. These findings define a mechanistic framework for how ST2-104 transduces "outside" (calcium channels) to "inside" signaling (CaMKKβ/AMPK/mTOR) to confer neuroprotection in AD.
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Affiliation(s)
- Yingshi Ji
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, PR China
| | - Jinghong Ren
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, PR China
| | - Yuan Qian
- Beijing Jishuitan Hospital, Peking University Fourth School of Clinical Medicine, Beijing, PR China
| | - Jiaxin Li
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, PR China
| | - Huanyu Liu
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, PR China
| | - Yuan Yao
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, PR China
| | - Jianfeng Sun
- Department of Physiology, Jilin University, Changchun, Jilin, PR China
| | - Rajesh Khanna
- Department of Pharmacology & Therapeutics, College of Medicine, University of Florida, Gainesville, Florida, United States of America
- Pain and Addiction Therapeutics (PATH) Collaboratory, College of Medicine, University of Florida, Gainesville, Florida, United States of America
| | - Li Sun
- Department of Neurology and Neuroscience Center, The First Hospital, Jilin University, Changchun, Jilin, PR China
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Lu G, Xiao S, Meng F, Zhang L, Chang Y, Zhao J, Gao N, Su W, Guo X, Liu Y, Li C, Tang W, Zou L, Yu S, Liu R. AMPK activation attenuates central sensitization in a recurrent nitroglycerin-induced chronic migraine mouse model by promoting microglial M2-type polarization. J Headache Pain 2024; 25:29. [PMID: 38454376 PMCID: PMC10921743 DOI: 10.1186/s10194-024-01739-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 02/27/2024] [Indexed: 03/09/2024] Open
Abstract
BACKGROUND Energy metabolism disorders and neurogenic inflammation play important roles in the central sensitization to chronic migraine (CM). AMP-activated protein kinase (AMPK) is an intracellular energy sensor, and its activation regulates inflammation and reduces neuropathic pain. However, studies on the involvement of AMPK in the regulation of CM are currently lacking. Therefore, this study aimed to explore the mechanism underlying the involvement of AMPK in the central sensitization to CM. METHODS Mice with recurrent nitroglycerin (NTG)-induced CM were used to detect the expression of AMPK protein in the trigeminal nucleus caudalis (TNC). Following intraperitoneal injection of the AMPK activator 5-aminoimidazole-4-carboxyamide ribonucleoside (AICAR) and inhibitor compound C, the mechanical pain threshold, activity level, and pain-like behaviors in the mice were measured. The expression of calcitonin gene-related peptide (CGRP) and cytokines, M1/M2 microglia, and NF-κB pathway activation were detected after the intervention. RESULTS Repeated NTG injections resulted in a gradual decrease in AMPK protein expression, and the negative regulation of AMPK by increased ubiquitin-like plant homeodomain and RING finger domain 1 (UHRF1) expression may counteract AMPK activation by increasing ADP/ATP. AICAR can reduce the hyperalgesia and pain-like behaviors of CM mice, improve the activity of mice, reduce the expression of CGRP, IL-1β, IL-6, and TNF-α in the TNC region, and increase the expression of IL-4 and IL-10. Moreover, AMPK in TNC was mainly located in microglia. AICAR could reduce the expression of inducible NO synthase (iNOS) in M1 microglia and increase the expression of Arginase 1 (Arg1) in M2 microglia by inhibiting the activation of NF-κB pathway. CONCLUSIONS AMPK was involved in the central sensitization of CM, and the activation of AMPK reduced neuroinflammation in NTG-induced CM mice. AMPK may provide new insights into interventions for energy metabolism disorders and neurogenic inflammation in migraine.
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Affiliation(s)
- Guangshuang Lu
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
- Department of Pediatrics, The Lu'an Hospital Affiliated to Anhui Medical University, The Lu'an People's Hospital, Lu'an, China
| | - Shaobo Xiao
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Fanchao Meng
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Leyi Zhang
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Yan Chang
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Jinjing Zhao
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Nan Gao
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
- School of Medicine, Nankai University, Tianjin, 300071, China
| | - Wenjie Su
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Xinghao Guo
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Yingyuan Liu
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Chenhao Li
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Wenjing Tang
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Liping Zou
- Medical School of Chinese PLA, Beijing, 100853, China
- Department of Pediatrics, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China
| | - Shengyuan Yu
- Medical School of Chinese PLA, Beijing, 100853, China.
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China.
| | - Ruozhuo Liu
- Medical School of Chinese PLA, Beijing, 100853, China.
- Department of Neurology, International Headache Center, The First Medical Center of Chinese PLA General Hospital, Fuxing Road 28, Haidian District, Beijing, 100853, China.
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Kuai Z, Chao X, He Y, Ren W. Metformin attenuates inflammation and boosts autophagy in the liver and intestine of chronologically aged rats. Exp Gerontol 2023; 184:112331. [PMID: 37967593 DOI: 10.1016/j.exger.2023.112331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 11/09/2023] [Accepted: 11/12/2023] [Indexed: 11/17/2023]
Abstract
BACKGROUND Our previous studies found that autophagy levels in liver and intestinal segments of naturally aging rats were downregulated, and the expression of pro-inflammatory factors was increased. The increased expression of pro-inflammatory factors might be related to the downregulation of autophagy. AMPK is the most critical upstream targeting and regulating molecule of autophagy, and Metformin, as an agonist of AMPK, has the effects of anti-inflammation and anti-aging. We pretreated 29-month-old naturally aging rats with Metformin for a short period and observed the changes in autophagy levels and pro-inflammatory factors in the liver, ileum, and colon after 31 days of intervention and preliminarily investigated the mechanism of its action. METHODS 29-month-old SPF male Wistar rats were divided into three groups: The control group, the Metformin 100 mg/kg intervention group, and the Metformin 250 mg/kg intervention group, with eight rats in each group. At 29 months, different concentrations of Metformin (100 mg/kg, 250 mg/kg) were given by gavage once a day until 30 months, and the control group was kept generally until 30 months. Western Blot was used to assess the expression levels of AMPK, P-AMPK, LC3, and P62 proteins in the liver and intestinal tissues. Intestinal and liver tissues were immunofluorescence labeled for LC3 and P62 proteins. Moreover, RT-qPCR was conducted to detect the expression levels of pro-inflammatory factors IL-1β, TNF-α, IL-6, and MMP-9 mRNA in liver and intestinal tissues. RESULTS Short-term Metformin pretreatment (31 days) in naturally aging rats (29 months old) increased autophagy levels and down-regulated the expression of various pro-inflammatory cytokines (IL-1β, TNF-α, MMP-9, and IL-6) in various intestinal segments and the liver-the expression of LC3II protein enriched with the increase of Metformin concentration. The level of P62 protein decreased with the accumulation of Metformin concentration. And a higher concentration of Metformin was associated with increased expression of P-AMPK protein. CONCLUSIONS Metformin intervention can boost the autophagy level in the liver and intestine and reduce the expression of aging-related inflammatory factors in aged rats, and these effects may be related to the increase of the AMPK phosphorylation level.
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Affiliation(s)
- Zheng Kuai
- Department of Geriatrics, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Xin Chao
- Department of Geriatrics, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Yuting He
- Department of Geriatrics, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - Weiying Ren
- Department of Geriatrics, Zhongshan Hospital, Fudan University, Shanghai 200032, China.
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Liang Y, Fan T, Bai M, Tang M, Cui N, Chen Y, Chen J, Wang J, Guan Y. A Knowledge Map of the Relationship between Diabetes and Stroke: A Bibliometric Analysis Study. Cerebrovasc Dis 2023; 53:270-287. [PMID: 37722359 DOI: 10.1159/000533383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 07/31/2023] [Indexed: 09/20/2023] Open
Abstract
INTRODUCTION The correlation between diabetes and stroke has been studied extensively in epidemiological research. Here, we used bibliometric software to visualize and analyze the literature related to diabetic stroke to provide an overview of the current state of research, hotspots, and future trends in the field. METHODS Based on the Web of Science Core Collection (WoSCC) database, we collected studies related to diabetic stroke from 2007 to December 2022. We used CiteSpace (version 6.1.R5), VOSviewer, and Scimago Graphica to create knowledge maps and conduct visual analyses on authors, countries, institutions, cited references, and keywords, and Origin for statistical analysis. RESULTS We included a total of 5,171 papers on diabetic stroke from the WoSCC database. Overall, there was a steady increase in the number of publications, with a high number of emerging scientists. The USA was the most productive and influential country, which dominated national collaborations. The most common subject category was "neurology." In total, 12 major clusters were generated from the cited references. Keyword analysis showed that keywords related to poststroke injury and treatment are those with the highest burst intensity and latest burst time. CONCLUSIONS Individual disease treatment remains a hot topic, and how to balance acute stroke treatment and glycemic control is currently a difficult clinical problem. At the same time, the mechanism of their interaction and the prevention and treatment of related causative factors remain a hot topic of current and future research.
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Affiliation(s)
- Yitong Liang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China,
| | - Tingting Fan
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Min Bai
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Meng Tang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Na Cui
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yue Chen
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Jinyi Chen
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Jingwen Wang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | - Yue Guan
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, China
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Li R, Duan W, Feng T, Gu C, Zhang Q, Long J, Huang S, Chen L. Lycium barbarum polysaccharide inhibits ischemia-induced autophagy by promoting the biogenesis of neural stem cells-derived extracellular vesicles to enhance the delivery of miR-133a-3p. Chin Med 2023; 18:117. [PMID: 37691119 PMCID: PMC10494430 DOI: 10.1186/s13020-023-00831-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 09/01/2023] [Indexed: 09/12/2023] Open
Abstract
BACKGROUND Neural stem cell-derived extracellular vesicles (NSC-EVs) mediated endogenous neurogenesis determines a crucial impact on spontaneous recovery after stroke. Here, we checked the influence of Lycium barbarum polysaccharide (LBP) on the biogenesis of NSC-EVs and then focused on studying mechanisms of LBP in ameliorating ischemic stroke outcome. METHODS LBP was prepared to precondition NSCs and isolate EVs. MCAO models and primary NSCs were administrated to evaluate the therapeutic effect. RT-PCR, western blot, flow cytometry, and immunofluorescence techniques were performed to explore the mechanism. RESULTS LBP pretreatment increased the production of NSC-EVs and improved the neuroprotective and recovery effects of NSC-EV in ischemic stroke mice. LBP-pretreated NSC-EV in a dose-dependent manner substantially reduced neuronal death compared with NSC-EV. Screening of the signaling cascade involved in the interaction between NSC-EV and neurons revealed that AMPK/mTOR signaling pathway inhibited autophagic activity in neurons receiving either treatment paradigm. NSC-EVs but not EVs collected from NSCs pretreated with the anti-miR-133a-3p oligonucleotide reduced cell death, whereas the anti-oligonucleotide promoted autophagy activity and cell death by modulating AMPK/mTOR signaling in OGD-induced primary neurons. CONCLUSION LBP activated AMPK/mTOR signaling pathway by increasing the enrichment and transfer of miR-133a-3p in NSC-EVs to inhibit stroke-induced autophagy activity.
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Affiliation(s)
- Rong Li
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Wenjie Duan
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Tingle Feng
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Chenyang Gu
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Qiankun Zhang
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Jun Long
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China
| | - Shiying Huang
- School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, 510310, China
| | - Lukui Chen
- Department of Neurosurgery, Neuroscience Center, Integrated Hospital of Traditional Chinese Medicine, Southern Medical University, 13 Shiliugang Rd, Guangzhou, 510310, China.
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Hermann R, Mestre Cordero VE, Fernández Pazos MDLM, Reznik FJ, Vélez DE, Marina Prendes MG. Role of autophagy in simulated ischemic-reperfused left atrial myocardium. Int J Cardiol 2023; 378:77-88. [PMID: 36804762 DOI: 10.1016/j.ijcard.2023.02.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 02/07/2023] [Accepted: 02/12/2023] [Indexed: 02/17/2023]
Abstract
BACKGROUND AND AIM Autophagy has recently emerged as a potential and promising therapeutic approach to maintain cardiac cellular homeostasis. The aim of the present study was to investigate the role of autophagy in the ischemic-reperfused atrial myocardium. METHODS Isolated rat left atria subjected to simulated ischemia-reperfusion were used. The bathing medium contained either 10 mM d-glucose or 10 mM d-glucose and 1.2 mM palmitate. 3-methyladenine (3-MA) was used as pharmacological autophagy inhibitor. RESULTS LC3-II/LC3-I ratio, an indicator of autophagosome formation, was significantly enhanced during reperfusion, this increase being slowed by the exposure to high palmitate concentration and prevented by 3-MA. Beclin-1 was significantly increased during reperfusion period in both metabolic conditions, and pharmacological inhibition of AMPK partially prevented LC3-II/LC3-I ratio increase. Autophagy inhibition significantly increased mitochondrial damage and impaired mitochondrial ATP synthesis rate at reperfusion. Tissue ATP content recovery and contractile reserve were also reduced during this period, these effects being more pronounced either in 3-MA treated atria and ischemic-reperfused atria incubated with palmitate. Moreover, severe tachyarrhythmias were observed in the presence of 3-MA, in both metabolic conditions. This phenomenon was partially prevented by mitochondrial inner membrane ion channels blocker, PK11195. CONCLUSION Present study provides new insights into the role of autophagy in ischemic-reperfused atrial myocardium. The observation of greater deterioration in mitochondrial structure and function when this process was inhibited, suggests an association between autophagy and the structural and functional preservation of mitochondria. Exogenous metabolic substrates, to which the myocardium is exposed during ischemia-reperfusion, might not affect this process.
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Affiliation(s)
- Romina Hermann
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Biológicas, Cátedra de Fisiología, Buenos Aires, Argentina; CONICET - Universidad de Buenos Aires, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Buenos Aires, Argentina.
| | - Victoria Evangelina Mestre Cordero
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Biológicas, Cátedra de Fisiología, Buenos Aires, Argentina; CONICET - Universidad de Buenos Aires, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Buenos Aires, Argentina
| | | | - Federico Joaquín Reznik
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Biológicas, Cátedra de Fisiología, Buenos Aires, Argentina
| | - Débora Elisabet Vélez
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Biológicas, Cátedra de Fisiología, Buenos Aires, Argentina; CONICET - Universidad de Buenos Aires, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Buenos Aires, Argentina
| | - María Gabriela Marina Prendes
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Ciencias Biológicas, Cátedra de Fisiología, Buenos Aires, Argentina; CONICET - Universidad de Buenos Aires, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Buenos Aires, Argentina
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Kalra P, Khan H, Singh TG, Grewal AK. Mechanistic insights on impact of Adenosine monophosphate-activated protein kinase (AMPK) mediated signalling pathways on cerebral ischemic injury. Neurosci Res 2023; 190:17-28. [PMID: 36403790 DOI: 10.1016/j.neures.2022.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 09/23/2022] [Accepted: 11/13/2022] [Indexed: 11/18/2022]
Abstract
Cerebral ischemia is the primary cause of morbidity and mortality worldwide due to the perturbations in the blood supply to the brain. The brain triggers a cascade of complex metabolic and cellular defects in response to ischemic stress. However, due to the disease heterogeneity and complexity, ischemic injury's metabolic and cellular pathologies remain elusive, and the link between various pathological mechanisms is difficult to determine. Efforts to develop effective treatments for these disorders have yielded limited efficacy, with no proper cure available to date. Recent clinical and experimental research indicates that several neuronal diseases commonly coexist with metabolic dysfunction, which may aggravate neurological symptoms. As a result, it stands to a reason that metabolic hormones could be a potential therapeutic target for major NDDs. Moreover, fasting signals also influence the circadian clock, as AMPK phosphorylates and promotes the degradation of the photo-sensing receptor (cryptochrome). Here, the interplay of AMPK signaling between metabolic regulation and neuronal death and its role for pathogenesis and therapeutics has been studied. We have also highlighted a significant signaling pathway, i.e., the adenosine monophosphate-activated protein kinase (AMPK) involved in the relationship between the metabolism and ischemia, which could be used as a target for future studies therapeutics, and review some of the clinical progress in this area.
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Affiliation(s)
- Palak Kalra
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, Punjab, India
| | - Heena Khan
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, Punjab, India
| | - Thakur Gurjeet Singh
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, Punjab, India.
| | - Amarjot Kaur Grewal
- Chitkara College of Pharmacy, Chitkara University, Rajpura 140401, Punjab, India
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Ma T, Yang L, Zhang B, Lv X, Gong F, Yang W. Hydrogen inhalation enhances autophagy via the AMPK/mTOR pathway, thereby attenuating doxorubicin-induced cardiac injury. Int Immunopharmacol 2023; 119:110071. [PMID: 37080067 DOI: 10.1016/j.intimp.2023.110071] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 03/04/2023] [Accepted: 03/20/2023] [Indexed: 04/22/2023]
Abstract
AIMS Doxorubicin is a drug widely used in clinical cancer treatment, but severe cardiotoxicity limits its clinical application. Autophagy disorder is an important factor in the mechanism of doxorubicin-induced cardiac injury. As the smallest molecule in nature, hydrogen has various biological effects such as anti-oxidation, anti-apoptosis and regulation of autophagy. Hydrogen therapy is currently considered to be an emerging therapeutic method, but the effect and mechanism of hydrogen on doxorubicin-induced myocardial injury have not been determined. The purpose of this study was to investigate the protective effect of hydrogen inhalation on doxorubicin-induced chronic myocardial injury and its effect and mechanism on autophagy. METHODS In this study, we established a chronic heart injury model by intraperitoneal injection of doxorubicin in rats for 30 days, accumulating 20 mg/kg. The effect of hydrogen inhalation on the cardiac function in rats was explored by echocardiography, Elisa, and H&E staining. To clarify the influence of autophagy, we detected the expression of LC3 and related autophagy proteins in vivo and in vitro by immunofluorescence and western blot.In order to further explore the mechanism of autophagy, we added pathway inhibitors and used western blot to preliminarily investigate the protective effect of hydrogen inhalation on myocardial injury caused by doxorubicin. RESULTS Hydrogen inhalation can improve doxorubicin-induced cardiac function decline and pathological structural abnormalities in rats. It was confirmed by immunofluorescence that hydrogen treatment could restore the expression of autophagy marker protein LC3 (microtubule-associated protein 1 light chain 3) in cardiomyocytes reduced by doxorubicin, while reducing cardiomyocyte apoptosis. Mechanistically, Western blot results consistently showed that hydrogen treatment up-regulated the ratio of p-AMPK (phosphorylated AMP-dependent protein kinase) to AMPK and down-regulated p-mTOR (phosphorylated mammalian target of rapamycin) and mTOR ratio. CONCLUSIONS These results suggest that hydrogen inhalation can activate autophagy through the AMPK/mTOR pathway and protect against myocardial injury induced by doxorubicin. Hydrogen inhalation therapy may be a potential treatment for doxorubicin-induced myocardial injury.
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Affiliation(s)
- Tianjiao Ma
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150000, China
| | - Lei Yang
- Department of Urinary Surgery, The First Hospital of Harbin, Harbin 150010, China
| | - Binmei Zhang
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150000, China
| | - Xin Lv
- Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, 150001, China
| | - Feifei Gong
- Department of Imaging, Chest Hospital of Harbin, 150056, China
| | - Wei Yang
- Department of Cardiology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150000, China.
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Chen Z, Gu Q, Chen R. miR-146a-5p regulates autophagy and NLRP3 inflammasome activation in epithelial barrier damage in the in vitro cell model of ulcerative colitis through the RNF8/Notch1/mTORC1 pathway. Immunobiology 2023; 228:152386. [PMID: 37329823 DOI: 10.1016/j.imbio.2023.152386] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/10/2023] [Accepted: 04/11/2023] [Indexed: 06/19/2023]
Abstract
Ulcerative colitis (UC) is a chronic inflammatory disease affecting the colon that can be influenced by microRNAs (miRNAs). This study aims to investigate the impact of miR-146a-5p on lipopolysaccharide (LPS)-induced Caco-2/HT-29 cell autophagy and NLRP3 inflammasome activation and the underlying mechanism, with the aim of identifying potential therapeutic targets. We used LPS to establish Caco-2/HT-29 cell models and measured cell viability by CCK-8. The levels of miR-146a-5p, RNF8, markers of NLRP3 inflammasome activation and autophagy, proteins involved in the Notch1/mTORC1 pathway, and inflammatory factors were assessed by RT-qPCR, Western blot, and ELISA. Intestinal epithelial barrier function was evaluated by measuring transepithelial electrical resistance. Autophagic flux was measured using tandem fluorescent-labeled LC3. miR-146a-5p was highly-expressed in LPS-induced Caco-2/HT-29 cells, and autophagy flux was blocked at the autolysosomal stage after LPS induction. Inhibition of miR-146a-5p suppressed NLRP3 inflammasome activation, reduced intestinal epithelial barrier damage, and facilitated autophagy inhibition in LPS-induced Caco-2/HT-29 cells. The autophagy inhibitor NH4Cl partially nullified the inhibitory effects of miR-146a-5p inhibition on NLRP3 inflammation activation. miR-146a-5p targeted RNF8, and silencing RNF8 partly abrogated the action of miR-146a-5p inhibition on promoting autophagy and inhibiting NLRP3 inflammasome activation. miR-146a-5p inhibition suppressed the Notch1/mTORC1 pathway activation by upregulating RNF8. Inhibition of the Notch1/mTORC1 pathway partially nullified the function of silencing RNF8 on inhibiting autophagy and bolstering NLRP3 inflammasome activation. In conclusion, miR-146a-5p inhibition may be a potential therapeutic approach for UC, as it facilitates autophagy of LPS-stimulated Caco-2/HT-29 cells, inhibits NLRP3 inflammasome activation, and reduces intestinal epithelial barrier damage by upregulating RNF8 and suppressing the Notch1/mTORC1 pathway.
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Affiliation(s)
- Zepeng Chen
- Department of Anorectal Surgery, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, China; First Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, China
| | - Qinglong Gu
- Department of Anorectal Surgery, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, China; First Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, China
| | - Ruichao Chen
- Department of Anorectal Surgery, Xuzhou City Hospital of TCM, Xuzhou, Jiangsu 221000, China.
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Huang A, Ji L, Li Y, Li Y, Yu Q. Gut microbiome plays a vital role in post-stroke injury repair by mediating neuroinflammation. Int Immunopharmacol 2023; 118:110126. [PMID: 37031605 DOI: 10.1016/j.intimp.2023.110126] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 03/18/2023] [Accepted: 03/29/2023] [Indexed: 04/11/2023]
Abstract
Cerebral stroke is a common neurological disease and often causes severe neurological deficits. With high morbidity, mortality, and disability rates, stroke threatens patients' life quality and brings a heavy economic burden on society. Ischemic cerebral lesions incur pathological changes as well as spontaneous nerve repair following stroke. Strategies such as drug therapy, physical therapy, and surgical treatment, can ameliorate blood and oxygen supply in the brain, hamper the inflammatory responses and maintain the structural and functional integrity of the brain. The gut microbiome, referred to as the "second genome" of the human body, participates in the regulation of multiple physiological functions including metabolism, digestion, inflammation, and immunity. The gut microbiome is not only inextricably associated with dangerous factors pertaining to stroke, including high blood pressure, diabetes, obesity, and atherosclerosis, but also influences stroke occurrence and prognosis. AMPK functions as a hub of metabolic control and is responsible for the regulation of metabolic events under physiological and pathological conditions. The AMPK mediators have been found to exert dual roles in regulating gut microbiota and neuroinflammation/neuronal apoptosis in stroke. In this study, we reviewed the role of the gut microbiome in cerebral stroke and the underlying mechanism of the AMPK signaling pathway in stroke. AMPK mediators in nerve repair and the regulation of intestinal microbial balance were also summarized.
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Affiliation(s)
- Airu Huang
- Department of Rehabilitation Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China
| | - Ling Ji
- Department of Rehabilitation Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China
| | - Yamei Li
- Department of Rehabilitation Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China
| | - Yufeng Li
- Department of Rehabilitation Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China.
| | - Qian Yu
- Department of Rehabilitation Medicine, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan 610072, China.
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12
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Su PW, Zhai Z, Wang T, Zhang YN, Wang Y, Ma K, Han BB, Wu ZC, Yu HY, Zhao HJ, Wang SJ. Research progress on astrocyte autophagy in ischemic stroke. Front Neurol 2022; 13:951536. [PMID: 36110390 PMCID: PMC9468275 DOI: 10.3389/fneur.2022.951536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 07/28/2022] [Indexed: 11/13/2022] Open
Abstract
Ischemic stroke is a highly disabling and potentially fatal disease. After ischemic stroke, autophagy plays a key regulatory role as an intracellular catabolic pathway for misfolded proteins and damaged organelles. Mounting evidence indicates that astrocytes are strongly linked to the occurrence and development of cerebral ischemia. In recent years, great progress has been made in the investigation of astrocyte autophagy during ischemic stroke. This article summarizes the roles and potential mechanisms of astrocyte autophagy in ischemic stroke, briefly expounds on the crosstalk of astrocyte autophagy with pathological mechanisms and its potential protective effect on neurons, and reviews astrocytic autophagy-targeted therapeutic methods for cerebral ischemia. The broader aim of the report is to provide new perspectives and strategies for the treatment of cerebral ischemia and a reference for future research on cerebral ischemia.
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Affiliation(s)
- Pei-Wei Su
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Zhe Zhai
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Tong Wang
- School of Nursing, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Ya-Nan Zhang
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Yuan Wang
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Ke Ma
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Bing-Bing Han
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Zhi-Chun Wu
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Hua-Yun Yu
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Hai-Jun Zhao
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
- *Correspondence: Hai-Jun Zhao
| | - Shi-Jun Wang
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shandong Co-innovation Center of Classic Traditional Chinese Medicine Formula, Shandong University of Traditional Chinese Medicine, Jinan, China
- Shi-Jun Wang
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13
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Peng Y, Yang J, Li Z, Chen S, Tang X, Zhou J. Overexpression of SLC40A1 inhibits the malignancy of hepatocellular carcinoma MHCC-97H cells by stimulation of autophagy. Biomed Signal Process Control 2022. [DOI: 10.1016/j.bspc.2022.103554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Yao Y, Ji Y, Ren J, Liu H, Khanna R, Sun L. Inhibition of autophagy by CRMP2-derived peptide ST2-104 (R9-CBD3) via a CaMKKβ/AMPK/mTOR pathway contributes to ischemic postconditioning-induced neuroprotection against cerebral ischemia-reperfusion injury. Mol Brain 2021; 14:123. [PMID: 34362425 PMCID: PMC8344221 DOI: 10.1186/s13041-021-00836-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 07/28/2021] [Indexed: 01/03/2023] Open
Abstract
Cerebral ischemia, a common cerebrovascular disease, is characterized by functional deficits and apoptotic cell death. Autophagy, a type of programmed cell death, plays critical roles in controlling neuronal damage and metabolic homeostasis, and has been inextricably linked to cerebral ischemia. We previously identified a short peptide aptamer from collapsin response mediator protein 2 (CRMP2), designated the Ca2+ channel-binding domain 3 (CBD3) peptide, that conferred protection against excitotoxicity and traumatic brain injury. ST2-104, a nona-arginine (R9)-fused CBD3 peptide, exerted beneficial effects on neuropathic pain and was neuroprotective in a model of Alzheimer's disease; however, the effect of ST2-104 on cerebral ischemia and its mechanism of action have not been studied. In this study, we modeled cerebral ischemia-reperfusion injury in rats with the middle cerebral artery occlusion (MCAO) as well as challenged SH-SY5Y neuroblastoma cells with glutamate to induce toxicity to interrogate the effects of ST2-104 on autophagy following ischemic/excitotoxic insults. ST2-104 reduced the infarct volume and improved the neurological score of rats subjected to MCAO. ST2-104 protected SH-SY5Y cells from death following glutamate exposure via blunting apoptosis and autophagy as well as limiting excessive calcium entry. 3-Methyladenine (3-MA), an inhibitor of autophagy, promoted the effects of ST2-104 in inhibiting apoptosis triggered by glutamate while rapamycin, an activator of autophagy, failed to do so. ST2-104 peptide reversed glutamate-induced apoptosis via inhibiting Ca2+/CaM-dependent protein kinase kinase β (CaMKKβ)-mediated autophagy, which was partly enhanced by STO-609 (an inhibitor of CaMKKβ). ST2-104 attenuated neuronal apoptosis by inhibiting autophagy through CaMKKβ/AMPK/mTOR pathway. Our results suggest that the neuroprotective effect of ST2-104 are due to actions on the crosstalk between apoptosis and autophagy via the CaMKKβ/AMPK/mTOR signaling pathway. The findings present novel insights into the potential neuroprotection of ST2-104 in cerebral ischemia.
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Affiliation(s)
- Yuan Yao
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021 People’s Republic of China
| | - Yingshi Ji
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021 People’s Republic of China
| | - Jinghong Ren
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021 People’s Republic of China
| | - Huanyu Liu
- Department of Pharmacology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin 130021 People’s Republic of China
| | - Rajesh Khanna
- Department of Pharmacology, College of Medicine, University of Arizona, 1501 North Campbell Drive, P.O. Box 245050, Tucson, AZ 85724 USA
| | - Li Sun
- Department of Neurology and Neuroscience Center, The First Hospital, Jilin University, Changchun, Jilin 130021 People’s Republic of China
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15
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Li H, Yang W, Wang Z, Wang X, Hao Y, Xi J, Lu H, Du Z, Feng J, Zhang B, Ma D. Computational research of mTORC1 inhibitor on cerebral ischemia-reperfusion injury. Aging (Albany NY) 2021; 13:19598-19613. [PMID: 34343111 PMCID: PMC8386574 DOI: 10.18632/aging.203371] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 07/08/2021] [Indexed: 12/16/2022]
Abstract
Ischemic stroke contributes to more than 80% of all strokes and has the four characteristics of high prevalence, high disability, high mortality, and high recurrence. Stroke is a preventable and controllable disease. In addition to controlling the primary disease, effective prevention and control measures need to be given to the occurrence and development of stroke. With the development and progress of modern treatment methods for ischemic stroke, the mortality and disability rate have decreased significantly. At present, the main treatment methods for ischemic stroke include thrombolysis, thrombus removal at the ultra-early stage, and treatment of improving collateral circulation in the acute phase. However, the ultra-early and early blood reperfusion involves reperfusion injury, which will cause secondary nerve damage, which is called cerebral ischemia/reperfusion injury (CIRI). Studies have found that autophagy is involved in the entire process of CIRI and can reduce the damage of CIRI. The mammalian target of Rapamycin (mTORC1) is the primary signal pathway regulating autophagy. And the mTORC1 inhibitor, Rapamycin, has been proved to exert neuroprotective effects in the ultra-early and early cerebral ischemia-reperfusion. Therefore, screening and designing mTORC1 inhibitors is very important to control reperfusion injury and reduce neuronal death and apoptosis. In this research, plenty of computer-assisted was applied to virtually screen and select potential mTORC1's inhibitors. We used Libdock to screen the structure and performed toxicity predictions, ADME (absorption, distribution, metabolism, excretion) to predict small molecules' pharmacological and toxicological properties. To assess the binding mechanism and affinity between the mTORC1 dimer and the ligand, molecular docking was performed. Then, the pharmacophore of small molecules in the docking conformation with the protein was supplemented by Schrodinger. Additionally, molecular dynamics simulations were conducted to assess if the ligand-receptor complex was stable in a natural environment. Furthermore, an experiment was performed to verify the inhibitory effect of compound 1 and compound 2 on mTOR protein. All in all, the study provides a hand of candidate drugs as well as pharmacological properties, which can play an essential role in mTORC1 inhibitors.
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Affiliation(s)
- Hui Li
- Department of Neurology and Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Wenzhuo Yang
- Clinical College, Jilin University, Changchun, China
| | - Zhenhua Wang
- Clinical College, Jilin University, Changchun, China
| | - Xu Wang
- Department of Neurology and Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Yulei Hao
- Department of Neurology and Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Jianxin Xi
- Clinical College, Jilin University, Changchun, China
| | - Han Lu
- Clinical College, Jilin University, Changchun, China
| | - Zhishan Du
- Clinical College, Jilin University, Changchun, China
| | - Jiachun Feng
- Department of Neurology and Neuroscience Center, The First Hospital of Jilin University, Changchun, China
| | - Bao Zhang
- Department of Urology Surgery, Aerospace Center Hospital, Beijing, China
| | - Di Ma
- Department of Neurology and Neuroscience Center, The First Hospital of Jilin University, Changchun, China
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Pien-Tze-Huang, a Chinese patent formula, attenuates NLRP3 inflammasome-related neuroinflammation by enhancing autophagy via the AMPK/mTOR/ULK1 signaling pathway. Biomed Pharmacother 2021; 141:111814. [PMID: 34146853 DOI: 10.1016/j.biopha.2021.111814] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/29/2021] [Accepted: 06/07/2021] [Indexed: 01/14/2023] Open
Abstract
NLRP3 inflammasome is a key mediator in ischemic stroke-induced neuroinflammation and subsequent brain injury. Our previous study demonstrated the potent activity of Pien-Tze-Huang (PTH), a well-known Chinese patent formula, in reducing mitochondria-mediated neuronal apoptosis in cerebral ischemia/reperfusion impaired rats. This study aims to elucidate the mechanistic action of PTH related to neuroinflammation in LPS-induced BV2 microglial cells and cerebral ischemia/reperfusion impaired rats. BV2 cells were stimulated with LPS for 12 h and treated with PTH with various concentrations. Modulation by PTH of relevant genes (IL-6, IL-1β, IL-18, TNF-α, COX-2 and iNOS mRNA) and proteins (NLRP3 inflammasome, autophagy and AMPK/mTOR/ULK signaling) was analyzed by real-time PCR and western blot, respectively. Similar analyses were conducted in middle cerebral artery occlusion rat model including neurological deficit, infarct volume, microglial activation, and key genes and proteins in modulating autophagy and NLRP3. Our results showed that PTH significantly inhibited the production of key proinflammatory mediators and protein expressions of NLRP3 and caspase-1 p20 in LPS induced BV2 cells. It also enhanced the autophagy response by modulating the key autophagy proteins via AMPK/mTOR/ULK related pathway. The reduced inflammatory responses and NLRP3 expressions by PTH were partially blocked by the autophagy inhibitor (3-MA) and AMPK blocker (compound C). In rats, PTH significantly reduced infarct size, suppressed microglial activation, and improved neuron deficit. It also promoted autophagy and reduced NLRP3 activity. Our study demonstrated that PTH inhibited NLRP3 inflammasome-mediated neuroinflammation, which was associated with enhanced autophagy via AMPK/mTOR/ULK1 pathway in vitro and in vivo.
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Su S, Wang X, Xi X, Zhu L, Chen Q, Zhang H, Qin Y, Yang B, Che N, Cao H, Zhong W, Wang B. Phellodendrine promotes autophagy by regulating the AMPK/mTOR pathway and treats ulcerative colitis. J Cell Mol Med 2021; 25:5707-5720. [PMID: 34002930 PMCID: PMC8184668 DOI: 10.1111/jcmm.16587] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/10/2021] [Accepted: 04/19/2021] [Indexed: 12/13/2022] Open
Abstract
To investigate the therapeutic effects of phellodendrine in ulcerative colitis (UC) through the AMPK/mTOR pathway. Volunteers were recruited to observe the therapeutic effects of Compound Cortex Phellodendri Liquid (Huangbai liniment). The main components of Compound Cortex Phellodendri Liquid were analysed via network pharmacology. The target of phellodendrine was further analysed. Caco-2 cells were cultured, and H2 O2 was used to stimulate in vitro cell model. Expression levels of LC3, AMPK, p-AMPK, mTOR and p-mTOR were detected via Western blotting and through immunofluorescence experiments. The therapeutic effects of phellodendrine were analysed via expression spectrum chip sequencing. The sequencing of intestinal flora further elucidated the therapeutic effects of phellodendrine. Compared with the control group, Compound Cortex Phellodendri Liquid could substantially improve the healing of intestinal mucosa. Network pharmacology analysis revealed that phellodendrine is the main component of Compound Cortex Phellodendri Liquid. Moreover, this alkaloid targets the AMPK signalling pathway. Results of animal experiments showed that phellodendrine could reduce the intestinal damage of UC compared with the model group. Findings of cell experiments indicated that phellodendrine treatment could activate the p-AMPK /mTOR signalling pathway, as well as autophagy. Expression spectrum chip sequencing showed that treatment with phellodendrine could promote mucosal healing and reduce inflammatory responses. Results of intestinal flora detection demonstrated that treatment with phellodendrine could increase the abundance of flora and the content of beneficial bacteria. Phellodendrine may promote autophagy by regulating the AMPK-mTOR signalling pathway, thereby reducing intestinal injury due to UC.
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Affiliation(s)
- Shuai Su
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Xin Wang
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Xiaonan Xi
- State Key Laboratory of Medicinal Chemical Biology and College of PharmacyNankai UniversityTianjinChina
| | - Lanping Zhu
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Qiuyu Chen
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Hongxia Zhang
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Yuan Qin
- College of Life Sciences and MedicineZhejiang Sci‐Tech UniversityHangzhouChina
| | - Boli Yang
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Na Che
- Department of PathologyTianjin Medical UniversityTianjinChina
- Department of PathologyGeneral Hospital of Tianjin Medical UniversityTianjinChina
| | - Hailong Cao
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Weilong Zhong
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
| | - Bangmao Wang
- Department of Gastroenterology and HepatologyTianjin Medical University General HospitalTianjin Institute of Digestive DiseaseTianjinChina
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Yang Y, Gao H, Liu W, Liu X, Jiang X, Li X, Wu Q, Xu Z, Zhao Q. Arctium lappa L. roots ameliorates cerebral ischemia through inhibiting neuronal apoptosis and suppressing AMPK/mTOR-mediated autophagy. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2021; 85:153526. [PMID: 33691269 DOI: 10.1016/j.phymed.2021.153526] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Arctium lappa L. roots are very popular cultivated vegetables, which possesses various pharmacological activities. Our previous studies have demonstrated that Arctium lappa L. roots exerted protective effects against H2O2, glutamate and N-methyl-D-aspartic acid (NMDA)-induced neuronal injury in vitro. However, whether Arctium lappa L. roots could prevent against cerebral ischemia and the underlying mechanism remain unclear. PURPOSE The objective of the present study was to investigate the neuroprotective effects of ethyl acetate extract of Arctium lappa L. roots (EAL) and the active ingredient 4,5-O-dicaffeoyl-1-O-[4-malic acid methyl ester]-quinic acid (DCMQA) in EAL against cerebral ischemia and explore the underlying mechanism. STUDY DESIGN The neuroprotective effects of EAL and DCMQA were investigated in rats with permanent middle cerebral artery occlusion (MCAO) and in oxygen glucose deprivation/reoxygenation (OGD/R)-stimulated SH-SY5Y cells, respectively. METHODS The infarct volume, brain edema and neurological deficits were measured following MCAO. TUNEL and Nissl staining were performed to detect neuronal loss and apoptosis of neurons in rat brains. Cell survival was measured by MTT and LDH assay. In addition, reactive oxygen species (ROS) and mitochondrial membrane potential (MMP) levels were determined by DCFH-DA and JC-1 fluorescent probe, respectively. Hoechst 33342 staining and Annexin V-FITC/PI double staining were performed to evaluate neuronal apoptosis. The expression levels of proteins were evaluated by western blot. RESULTS EAL reduced brain infarct volume, ameliorated brain edema and improved neurological deficits in MCAO rats. In addition, EAL inhibited oxidative stress and inflammatory responses following MCAO. Besides, active compound DCMQA alleviated cytotoxicity as well as inhibited over-production of intracellular ROS and loss of MMP induced by OGD/R in SH-SY5Y cells. Moreover, EAL and DCMQA inhibited apoptosis by decreasing the expressions of pro-apoptotic proteins including bax, cytochrome c and cleaved caspase-3 while promoting the bcl-2 expression in MCAO rats and OGD/R-stimulated neurons, respectively. In addition, DCMQA suppressed the production of autophagosomes and down-regulated expression of Beclin 1 and LC3. Furthermore, inhibiting AMP-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR) signaling pathway contributed to DCMQA-mediated suppression of autophagy induced by OGD/R. CONCLUSION Our findings demonstrate that Arctium lappa L. roots protect against cerebral ischemia through inhibiting apoptosis and AMPK/mTOR-mediated autophagy in vitro and in vivo, providing a theoretical basis for the development of CQAs in Arctium lappa L. roots as neuroprotective drugs for the prevention and treatment of ischemic stroke.
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Affiliation(s)
- Yue Yang
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Huan Gao
- School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Wenwu Liu
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Xin Liu
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Xiaowen Jiang
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Xiang Li
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Qiong Wu
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Zihua Xu
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China
| | - Qingchun Zhao
- Department of Pharmacy, General Hospital of Northern Theater Command, 83 Wenhua Road, Shenyang, Liaoning 110016, China; School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, China.
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Torres-Esquivel C, Montiel T, Flores-Méndez M, Massieu L. Effect of β-Hydroxybutyrate on Autophagy Dynamics During Severe Hypoglycemia and the Hypoglycemic Coma. Front Cell Neurosci 2020; 14:547215. [PMID: 33173467 PMCID: PMC7538649 DOI: 10.3389/fncel.2020.547215] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 08/31/2020] [Indexed: 12/27/2022] Open
Abstract
Glucose supply from blood is mandatory for brain functioning and its interruption during acute hypoglycemia or cerebral ischemia leads to brain injury. Alternative substrates to glucose such as the ketone bodies (KB), acetoacetate (AcAc), and β-hydroxybutyrate (BHB), can be used as energy fuels in the brain during hypoglycemia and prevent neuronal death, but the mechanisms involved are still not well understood. During glucose deprivation adaptive cell responses can be activated such as autophagy, a lysosomal-dependent degradation process, to support cell survival. However, impaired or excessive autophagy can lead to cell dysfunction. We have previously shown that impaired autophagy contributes to neuronal death induced by glucose deprivation in cortical neurons and that D isomer of BHB (D-BHB) reestablishes the autophagic flux increasing viability. Here, we aimed to investigate autophagy dynamics in the brain of rats subjected to severe hypoglycemia (SH) without glucose infusion (GI), severe hypoglycemia followed by GI (SH + GI), and a brief period of hypoglycemic coma followed by GI (Coma). The effect of D-BHB administration after the coma was also tested (Coma + BHB). The transformation of LC3-I to LC3-II and the abundance of autophagy proteins, Beclin 1 (BECN1), ATG7, and ATG12–ATG5 conjugate, were analyzed as an index of autophagosome formation, and the levels of sequestrosome1/p62 (SQSTM1/p62) were determined as a hallmark of autophagic degradation. Data suggest that autophagosomes accumulate in the cortex and the hippocampus of rats after SH, likely due to impaired autophagic degradation. In the cortex, autophagosome accumulation persisted at 6 h after GI in animals exposed to SH but recovered basal levels at 24 h, while in the hippocampus no significant effect was observed. In animals subjected to coma, autophagosome accumulation was observed at 24 h after GI in both regions. D-BHB treatment reduced LC3-II and SQSTM1/p62 content and reduced ULK1 phosphorylation by AMPK, suggesting it stimulates the autophagic flux and decreases AMPK activity reducing autophagy initiation. D-BHB also reduced the number of degenerating cells. Together, data suggest different autophagy dynamics after GI in rats subjected to SH or the hypoglycemic coma and support that D-BHB treatment can modulate autophagy dynamics favoring the autophagic flux.
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Affiliation(s)
- Carmen Torres-Esquivel
- Departamento de Neuropatología Molecular, División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Teresa Montiel
- Departamento de Neuropatología Molecular, División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Marco Flores-Méndez
- Departamento de Neuropatología Molecular, División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Lourdes Massieu
- Departamento de Neuropatología Molecular, División de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
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20
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Xiao Y, Fan M, Jin W, Li WA, Jia Y, Dong Y, Jiang X, Xu J, Meng N, Lv P. Lithium chloride ameliorated spatial cognitive impairment through activating mTOR phosphorylation and inhibiting excessive autophagy in the repeated cerebral ischemia-reperfusion mouse model. Exp Ther Med 2020; 20:109. [PMID: 32989388 PMCID: PMC7517419 DOI: 10.3892/etm.2020.9237] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Accepted: 02/18/2020] [Indexed: 12/19/2022] Open
Abstract
Lithium has been previously demonstrated to alleviate cognitive impairment caused by neurodegenerative diseases and acute brain injuries; however, the specific mechanism remains elusive. In the present study, the C57BL/6 mouse model of spatial cognitive impairment induced by repeated cerebral ischemia-reperfusion was established. Morris water maze test was performed to evaluate the levels of spatial cognitive impairment. Nissl staining was used to observe any morphological alterations, whilst western blotting was performed to measure the expression levels of microtubule-associated protein light chain 3 (LC3) and Beclin1 in addition to mTOR phosphorylation. LiCl was found to significantly improve spatial learning and memory impairments according to data from the Morris water maze test. Nissl staining indicated that LiCl inhibited neuronal damage in the CA1 region of the hippocampus. Additionally, LiCl increased mTOR phosphorylation, reduced beclin1 expression and reduced the LC3 II/I expression ratio. Taken together, these findings suggest that LiCl may alleviate the spatial cognitive impairment induced by repeated cerebral ischemia-reperfusion. This observation may be attributed to the inhibition of excessive autophagy by LiCl through mTOR signaling activation.
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Affiliation(s)
- Yining Xiao
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Mingyue Fan
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Wei Jin
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - William A Li
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI 48201, USA
| | - Yanqiu Jia
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Yanhong Dong
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Xin Jiang
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Jing Xu
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Nan Meng
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
| | - Peiyuan Lv
- Department of Neurology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China.,Department of Neurology, Hebei Medical University, Shijiazhuang, Hebei 050017, P.R. China
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21
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Wu XL, Lu SS, Liu MR, Tang WD, Chen JZ, Zheng YR, Ahsan A, Cao M, Jiang L, Hu WW, Wu JY, Chen Z, Zhang XN. Melatonin receptor agonist ramelteon attenuates mouse acute and chronic ischemic brain injury. Acta Pharmacol Sin 2020; 41:1016-1024. [PMID: 32107468 PMCID: PMC7470806 DOI: 10.1038/s41401-020-0361-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 01/02/2020] [Indexed: 02/06/2023] Open
Abstract
Melatonin receptors (MTs) are potential drug targets for stroke therapy. Ramelteon is a selective melatonin receptor agonist used to treat insomnia. In this study we investigated whether ramelteon could attenuate cerebral ischemia in mice. Acute focal cerebral ischemia was induced in mice via middle cerebral artery occlusion (MCAO). We found oral administration of ramelteon (3.0 mg/kg) significantly attenuated ischemic injury even when it was given 4 h after the onset of ischemia. We showed that administration of ramelteon (3.0 mg/kg) displayed comparable protective efficacy and length of effective time window as administration of edaravone (10 mg/kg, i.p.), which was used in clinic to treat ischemic stroke. Chronic ischemic brain injury was induced in mice using photothrombosis. Oral administration of ramelteon (3.0 mg · kg-1 · d-1) for 7 days after ischemia significantly attenuated functional deficits for at least 15 days. The neuroprotection of ramelteon was blocked by 4-P-PDOT, a specific MT antagonist. We further revealed that ramelteon significantly inhibited autophagy in the peri-infarct cortex in both the mouse ischemia models via regulating AMPK/mTOR signaling pathway. Intracerebroventricular injection of rapamycin, an autophagy activator, compromised the neuroprotection of ramelteon, suggesting ramelteon might attenuate ischemic injury by counteracting autophagic cell death. These data demonstrate for the first time the potential benefits of ramelteon in the treatment of both acute and chronic ischemic brain injury and provide the rationale for the application of ramelteon in stroke therapy.
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22
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Xiao Y, Zheng X, Li G, Zhou C, Wu C, Xu Z, Hu G, Guo X, Li L, Cao H, Latigo V, Liu P. Investigation of the effects of dichlorvos poisoning on AMPK signaling pathway in chicken brain tissues. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 261:114109. [PMID: 32109818 DOI: 10.1016/j.envpol.2020.114109] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 01/09/2020] [Accepted: 01/29/2020] [Indexed: 06/10/2023]
Abstract
Dichlorvos is a common crop insecticide widely used by people which causes extensive and serious environmental pollution. However, it has been shown that organophosphorus poisoning causes energy metabolism and neural disorders. The overall purpose of this study was to investigate the damage to brain tissue and the changes in AMPK signaling pathway-related gene expression after dichlorvos poisoning in chickens. White-feathered broiler chickens, as the research subjects of this experiment, were divided into three groups: control group, low-dose group (77.5% dichlorvos at 1.13 mg/kg dose) and high-dose group (77.5% dichlorvos at 10.2 mg/kg dose). Clinical symptoms were observed after modeling, and an integrative analysis was conducted using HE staining microscopy, immune-histochemical microscopy, electron microscopy and PCR arrays. The results showed that the high-dose group had more obvious dyspnea, salivation, convulsion and other neurological phenomena. Pathological sections showed that nuclear disintegration of neurons was most obvious in the low-dose group, and apoptosis of brain cells was most obvious in the high-dose group, and the mitochondrial structure was destroyed in the two poisoned group, i.e. low-dose group and high-dose group. PCR arrays showed that AMPK signaling pathway was inhibited and the expressions of genes involved in energy metabolism (ACACA and PRKAA1) were significantly changed. Furthermore, genes associated with protein synthesis (EIF4EBP1) were significantly upregulated. FASN and HMGCR expressions were significantly increased. There were significant changes in the expressions of cell cycle-related genes (STK11, TP53 and FOXO3). Organophosphate poisoning can cause a lot of nuclear disintegration of brain neurons, increases cell apoptosis, disrupts the energy metabolism of mitochondrial structure, and inhibits the AMPK signaling pathway. These results provide a certain idea and basis for studying the mechanism of AMPK signaling after organophosphorus poisoning and provide a research basis for the prevention and treatment of organophosphorus poisoning.
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Affiliation(s)
- Yanyu Xiao
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China; Department of Animal Medicine, College of Animal Science and Technology, Guangxi University, Nanning, Guangxi, 530005, China
| | - Xibang Zheng
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Guyue Li
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Changming Zhou
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Cong Wu
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Zheng Xu
- Department of Mathematics and Statistic, Wright State University Dayton, OH, 45435, USA
| | - Guoliang Hu
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Xiaoquan Guo
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Lin Li
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Huabin Cao
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Vincent Latigo
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Ping Liu
- Jiangxi Provincial Key Laboratory for Animal Health, Institute of Animal Population Health, College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, Jiangxi, China.
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Protective Role of mTOR in Liver Ischemia/Reperfusion Injury: Involvement of Inflammation and Autophagy. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:7861290. [PMID: 31827701 PMCID: PMC6885218 DOI: 10.1155/2019/7861290] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/24/2019] [Accepted: 10/14/2019] [Indexed: 02/06/2023]
Abstract
Liver ischemia/reperfusion (IR) injury is a common phenomenon after liver resection and transplantation, which often results in liver graft dysfunction such as delayed graft function and primary nonfunction. The mammalian target of rapamycin (mTOR) is an evolutionarily highly conserved serine/threonine protein kinase, which coordinates cell growth and metabolism through sensing environmental inputs under physiological or pathological conditions, involved in the pathophysiological process of IR injury. In this review, we mainly present current evidence of the beneficial role of mTOR in modulating inflammation and autophagy under liver IR to provide some evidence for the potential therapies for liver IR injury.
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Nazarinia D, Aboutaleb N, Gholamzadeh R, Nasseri Maleki S, Mokhtari B, Nikougoftar M. Conditioned medium obtained from human amniotic mesenchymal stem cells attenuates focal cerebral ischemia/reperfusion injury in rats by targeting mTOR pathway. J Chem Neuroanat 2019; 102:101707. [PMID: 31672459 DOI: 10.1016/j.jchemneu.2019.101707] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 12/17/2022]
Abstract
Conditioned medium obtained from human amniotic mesenchymal stem cells (hAMSC-CM) was recently shown to have many antioxidant, antiapoptotic and proangiogenic growth factors. The present study was performed to investigate whether protective effects of hAMSC-CM against focal cerebral ischemia/ reperfusion (I/R) injury is associated with modulation of the mammalian target of rapamycin (mTOR) pathway. A rat model of middle cerebral artery occlusion (MCAO) was created and the animals were divided into three groups including sham, MCAO and MCAO + hAMSC-CM. Drug was administrated immediately after cerebral reperfusion (i.v). The expressions of mTOR, p-mTOR and LC3 were measured using Western blotting and real time-PCR, respectively. Apoptosis and neuronal loss were determined using TUNEL and Nissl staining, respectively. Infarct volume and the blood-brain barrier (BBB) damage were evaluated using 2,3,5-triphenyltetrazolium chloride (TTC) staining and Evans Blue (EB) uptake, respectively. Compared with sham, significant infarct volume, apoptotic cell death, and neuronal loss were found in MCAO rats that reversed by hAMSC-CM (P < 0.05). Likewise, MCAO rats exhibited increased mRNA level of light-chain 3 (LC3) and the LC3II/LC3I ratio as well as decreased expression level of p-mTOR that reversed by hAMSC-CM (P < 0.05). There were no significant differences in the expression of total mTOR among the experimental groups. In summary, our results demonstrate that hAMSC-CM gives rise to neuroprotection following ischemic stroke by restoring mTOR activity and inhibiting autophagy.
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Affiliation(s)
- Donya Nazarinia
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Nahid Aboutaleb
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Raheleh Gholamzadeh
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Solmaz Nasseri Maleki
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Behnaz Mokhtari
- Physiology Research Center and Department of Physiology, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mahin Nikougoftar
- Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
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25
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Schizandrin Protects against OGD/R-Induced Neuronal Injury by Suppressing Autophagy: Involvement of the AMPK/mTOR Pathway. Molecules 2019; 24:molecules24193624. [PMID: 31597329 PMCID: PMC6804185 DOI: 10.3390/molecules24193624] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 09/25/2019] [Accepted: 10/06/2019] [Indexed: 01/11/2023] Open
Abstract
The neuroprotective role of schizandrin (SA) in cerebral ischemia-reperfusion (I/R) was recently highlighted. However, whether SA plays a regulatory role on autophagy in cerebral I/R injury is still unclear. This study aimed to explore whether the neuroprotective mechanisms of SA were linked to its regulation of AMP-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR)/autophagy pathway in vivo and in vitro. The present study confirmed that SA significantly improved oxygen-glucose deprivation/re-oxygenation (OGD/R)-induced PC12 cells injury. The results of immunoblotting and confocal microscope showed that SA decreased autophagy in OGD/R-injured PC12 cells, which was reflected by the decreased Beclin-1 and LC3-II expression, autophagy flux level, and LC3 puncta formation. In addition, the autophagy inducer rapamycin partially prevented the effects of SA on cell viability and autophagy after OGD/R, whereas the autophagy inhibitor 3-methyladenine (3-MA) exerted the opposite effect. The results of Western blotting showed that SA markedly decreased the phosphorylation of AMPK (p-AMPK), whereas the phosphor-mTOR (p-mTOR) levels increased in the presence of OGD/R insult. Furthermore, pretreatment with the AMPK inducer AICAR partially reversed the protective effects and autophagy inhibition of SA. However, AMPK inhibitor Compound C pretreatment further promoted the inhibition of SA on autophagy induction and cell damage induced by OGD/R. Taken together, these findings demonstrate that SA protects against OGD/R insult by inhibiting autophagy through the regulation of the AMPK-mTOR pathway and that SA may have therapeutic value for protecting neurons from cerebral ischemia.
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26
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Cao M, Fang Y, Jia W, Wang Y, Sun J, Tao D. Emodin relieves hypoxia-triggered injury via elevation of microRNA-25 in PC-12 cells. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:2678-2687. [PMID: 31257935 DOI: 10.1080/21691401.2019.1633339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Emodin (EMO) possesses extensive pharmacological activities, which has been proven to exert the protective impact in diverse nervous system diseases. Nonetheless, whether EMO emerges a neuro-protective activity in hypoxic-evoked ischemic brain injury is still further probed. The intention of the research is to disclose whether EMO emerges neuro-protective activity in hypoxic-evoked ischemic brain injury. PC-12 received hypoxia administration, and then cell viability, apoptosis and autophagy were estimated. After EMO disposition, the above-involved cellular processes were evaluated again. MiR-25 functions in EMO-affected cells were also estimated. The interrelation between miR-25 and neurofilament light-chain polypeptide gene (NEFL) and the conceivable roles of NEFL in hypoxia-disposed cells were investigated. The latent mechanism was uncovered by mTOR and Notch pathways determination. Hypoxia triumphantly triggered apoptosis and autophagy, but EMO repressed these functions in PC-12 cells. Increased miR-25 was induced by EMO, and inhibited miR-25 abated the impacts of EMO on hypoxia-disposed PC-12 cells. NEFL as a neoteric target gene of miR-25 was predicated, and overexpressed NEFL annulled the functions of EMO in hypoxia-injured cells. EMO activated mTOR and Notch pathways through repressing NEFL. The investigations corroborated that EMO weakened hypoxia-triggered injury via elevating miR-25 by targeting NEFL in PC-12 cells.
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Affiliation(s)
- Mingjuan Cao
- a Department of Rehabilitation, Zibo Integrated Traditional Chinese and Western Medicine Hospital , Zibo , PR China
| | - Yuqing Fang
- b Department of Neurology, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated with Shandong First Medical University , Jinan , PR China
| | - Wei Jia
- c Department of Gastroenterology, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated with Shandong First Medical University , Jinan , PR China
| | - Yao Wang
- d Department of Neurology, The First Affiliated Hospital of Dalian Medical University , Dalian , PR China
| | - Jingyi Sun
- d Department of Neurology, The First Affiliated Hospital of Dalian Medical University , Dalian , PR China
| | - Dingbo Tao
- d Department of Neurology, The First Affiliated Hospital of Dalian Medical University , Dalian , PR China
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27
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Thiebaut AM, Hedou E, Marciniak SJ, Vivien D, Roussel BD. Proteostasis During Cerebral Ischemia. Front Neurosci 2019; 13:637. [PMID: 31275110 PMCID: PMC6594416 DOI: 10.3389/fnins.2019.00637] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/03/2019] [Indexed: 12/21/2022] Open
Abstract
Cerebral ischemia is a complex pathology involving a cascade of cellular mechanisms, which deregulate proteostasis and lead to neuronal death. Proteostasis refers to the equilibrium between protein synthesis, folding, transport, and protein degradation. Within the brain proteostasis plays key roles in learning and memory by controlling protein synthesis and degradation. Two important pathways are implicated in the regulation of proteostasis: the unfolded protein response (UPR) and macroautophagy (called hereafter autophagy). Both are necessary for cell survival, however, their over-activation in duration or intensity can lead to cell death. Moreover, UPR and autophagy can activate and potentiate each other to worsen the issue of cerebral ischemia. A better understanding of autophagy and ER stress will allow the development of therapeutic strategies for stroke, both at the acute phase and during recovery. This review summarizes the latest therapeutic advances implicating ER stress or autophagy in cerebral ischemia. We argue that the processes governing proteostasis should be considered together in stroke, rather than focusing either on ER stress or autophagy in isolation.
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Affiliation(s)
- Audrey M Thiebaut
- INSERM, INSERM UMR-S U1237, Physiopathology and Imaging of Neurological Disorders, University of Caen Normandy, Caen, France
| | - Elodie Hedou
- INSERM, INSERM UMR-S U1237, Physiopathology and Imaging of Neurological Disorders, University of Caen Normandy, Caen, France
| | - Stefan J Marciniak
- Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom.,Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Denis Vivien
- INSERM, INSERM UMR-S U1237, Physiopathology and Imaging of Neurological Disorders, University of Caen Normandy, Caen, France.,Department of Clinical Research, University of Caen Normandy, Caen, France
| | - Benoit D Roussel
- INSERM, INSERM UMR-S U1237, Physiopathology and Imaging of Neurological Disorders, University of Caen Normandy, Caen, France
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Zhao M, Li XW, Chen DZ, Hao F, Tao SX, Yu HY, Cheng R, Liu H. Neuro-Protective Role of Metformin in Patients with Acute Stroke and Type 2 Diabetes Mellitus via AMPK/Mammalian Target of Rapamycin (mTOR) Signaling Pathway and Oxidative Stress. Med Sci Monit 2019; 25:2186-2194. [PMID: 30905926 PMCID: PMC6442495 DOI: 10.12659/msm.911250] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background We investigated the effects of metformin on neurological function and oxidative stress in patients with type 2 diabetes mellitus with acute stroke. Material/Methods We randomly assigned 80 acute stroke patients to 2 groups: the metformin combined group and the insulin group. Each group had 40 patients and all were treated with standard stroke treatment. The indexes of nervous functional score and oxidative stress were measured before and 2 weeks after treatment. The primary fetal rat hippocampal neurons were gradually matured after 7 days of culture, and divided into the control group (Con), the oxygen-glucose deprivation model group (Mod), and the metformin group (Met). In the Met group, 10 mmol/L metformin was added, and the Con group and the Mod group received equal volumes of cell culture fluid. Cell viability, cell apoptosis rate, and the expression of Bax, Bcl-2, AMPK, pAMPK and mTOR were detected; MDA content and SOD activity were also detected. Results Before treatment, there was no difference in the metrical indexes between the 2 groups. After treatment, the treatment group was better than the control group in neurological function scores and multiple oxidative stress-related indicators. The experimental results of primary fetal rat hippocampal neuronal cells suggest that this mechanism of improvement is closely related to the AMPK/mTOR signaling pathway. Conclusions Metformin can improve the neurological function and oxidative stress status of acute stroke patients with type 2 diabetes, and its mechanism may be related to the AMPK/mTOR signaling pathway and oxidative stress.
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Affiliation(s)
- Min Zhao
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - Xiao Wan Li
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - De Z Chen
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - Fang Hao
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - Shu X Tao
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - Hai Yan Yu
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
| | - Rui Cheng
- Government Clinics of Liaocheng, Liaocheng, Shandong, China (mainland)
| | - Hong Liu
- Department of Neurology, Liaocheng People's Hospital, Liaocheng, Shandong, China (mainland)
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29
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Autophagy as a Homeostatic Mechanism in Response to Stress Conditions in the Central Nervous System. Mol Neurobiol 2019; 56:6594-6608. [DOI: 10.1007/s12035-019-1546-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 03/12/2019] [Indexed: 12/11/2022]
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30
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Yang Y, Chen Q, Zhao Q, Luo Y, Xu Y, Du W, Wang H, Li H, Yang L, Hu C, Zhang J, Li Y, Xia H, Chen Z, Ma J, Tian X, Yang J. Inhibition of COX2/PGD2-Related Autophagy Is Involved in the Mechanism of Brain Injury in T2DM Rat. Front Cell Neurosci 2019; 13:68. [PMID: 30873010 PMCID: PMC6400968 DOI: 10.3389/fncel.2019.00068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 02/11/2019] [Indexed: 12/21/2022] Open
Abstract
The present study was designed to observe the effect of COX2/PGD2-related autophagy on brain injury in type 2 diabetes rats. The histopathology was detected by haematoxylin–eosin staining. The learning and memory functions were evaluated by Morris water maze. The levels of insulin and PGD2 were measured by enzyme-linked immunosorbent assay. The expressions of COX2, p-AKT(S473), p-AMPK(T172), Aβ, Beclin1, LC3BII, and p62 were measured by immunohistochemistry and Western blotting. In model rats, we found that the body weight was significantly decreased, the blood glucose levels were significantly increased, the plasma insulin content was significantly decreased, the learning and memory functions were impaired and the cortex and hippocampus neurons showed significant nuclear pyknosis. The levels of COX2, p-AKT(S473), PGD2, Aβ, Beclin1 and p62 were significantly increased, whereas the expression of p-AMPK(T172) and LC3BII was significantly decreased in the cortex and hippocampus of model rats. In meloxicam-treated rats, the body weight, blood glucose and the content of plasma insulin did not significantly change, the learning and memory functions were improved and nuclear pyknosis was improved in the cortex and hippocampus neurons. The expression of p-AMPK(T172), Beclin1 and LC3BII was significantly increased, and the levels of COX2, p-AKT(S473), PGD2, Aβ, and p62 were significantly decreased in the cortex and hippocampus of meloxicam-treated rats. Our results suggested that the inhibition of COX2/PGD2-related autophagy was involved in the mechanism of brain injury caused by type 2 diabetes in rats.
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Affiliation(s)
- Yang Yang
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Qi Chen
- Department of Pharmacy, GuiZhou Provincial People's Hospital, Guiyang, China
| | - Quanfeng Zhao
- Department of Pharmacy, Southwest Hospital, First Affiliated Hospital to TMMU, Third Military Medical University (Army Medical University), Chongqing, China
| | - Ying Luo
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Ying Xu
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, University at Buffalo, The State University of New York (SUNY), Buffalo, NY, United States
| | - Weimin Du
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Hong Wang
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Huan Li
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Lu Yang
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Congli Hu
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Jiahua Zhang
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Yuke Li
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Hui Xia
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Zhihao Chen
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Jie Ma
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Xiaoyan Tian
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
| | - Junqing Yang
- Department of Pharmacology, Chongqing Medical University, The Key Laboratory of Biochemistry and Molecular Pharmacology, Chongqing, China
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Shi B, Ma M, Zheng Y, Pan Y, Lin X. mTOR and Beclin1: Two key autophagy-related molecules and their roles in myocardial ischemia/reperfusion injury. J Cell Physiol 2019; 234:12562-12568. [PMID: 30618070 DOI: 10.1002/jcp.28125] [Citation(s) in RCA: 138] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 12/18/2018] [Indexed: 12/12/2022]
Abstract
Autophagy is the general term of lysosomal degradation of substances in cells, which is considered the key to maintaining the normal structure and function of the heart. It also has a correlation with several heart diseases, in particular, myocardial ischemia/reperfusion (I/R) injury. At the stage of myocardial ischemia, autophagy degrades nonfunctional cytoplasmic proteins providing the critical nutrients for the critical life activities, thereby suppressing cell apoptosis and necrosis. However, autophagy is likely to affect the heart negatively in the reperfusion stage. Mammalian target of rapamycin (mTOR) and Beclin1 are two vital autophagy-related molecules in myocardial I/R injury playing significant roles in different stages. In the ischemia stage, mTOR plays its roles through AMPK/mTOR and phosphoinositide 3-kinase/Akt/mTOR pathway, whereas Beclin1 plays its roles through its upregulation in the reperfusion stage. A possible interaction between mTOR and Beclin1 has been reported recently, and further studies need to be done to find the underlying interaction between the two molecules in myocardial I/R injury.
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Affiliation(s)
- Binhao Shi
- Department of Cardiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China.,Department of Clinical Medical, Anhui Medical University, Hefei, China
| | - Mengqing Ma
- Department of Cardiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yitian Zheng
- Department of Cardiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China.,Department of Clinical Medical, Anhui Medical University, Hefei, China
| | - Yanyan Pan
- Department of Cardiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China.,Department of Clinical Medical, Anhui Medical University, Hefei, China
| | - Xianhe Lin
- Department of Cardiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
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He H, Zeng Q, Huang G, Lin Y, Lin H, Liu W, Lu P. Bone marrow mesenchymal stem cell transplantation exerts neuroprotective effects following cerebral ischemia/reperfusion injury by inhibiting autophagy via the PI3K/Akt pathway. Brain Res 2018; 1707:124-132. [PMID: 30448444 DOI: 10.1016/j.brainres.2018.11.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 11/11/2018] [Accepted: 11/12/2018] [Indexed: 12/11/2022]
Abstract
Although cerebral ischemia itself is associated with a high rate of disability, secondary cerebral ischemia/reperfusion (I/R) injury following recanalization is associated with much more severe outcomes. The mechanisms underlying cerebral I/R injury are complex, involving neuronal death caused by apoptosis and autophagy. Autophagy is critical for cell survival and plays an important role in the pathogenesis of cerebral I/R injury. Research has indicated that transplantation of bone marrow mesenchymal stem cells (BMSCs) is effective in repairing and reconstructing brain tissue, and that this effect may be associated with the regulation of autophagy. To explore this hypothesis, we intravenously transplanted BMSCs into a rat model of cerebral I/R injury (middle cerebral artery occlusion [MCAO]). Our results indicated that BMSCs transplantation promoted behavioral recovery, reduced cerebral infarction volume, and decreased the number of apoptotic cells in rats exposed to cerebral I/R injury. Moreover, this effect was associated with reduced expression of the autophagy-associated proteins microtubule-associated protein 1 light chain 3 (LC3) and Beclin-1. Furthermore, BMSCs remarkably increased the expression of p-Akt and p-mTOR following cerebral I/R injury. Expression of LC3 also increased when the PI3K pathway was blocked using LY294002. In summary, our results indicated that the protective effects of BMSCs in cerebral I/R injury may be associated with the inhibition of autophagy via the activation of the PI3K/Akt/mTOR signaling pathway.
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Affiliation(s)
- He He
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
| | - Qing Zeng
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
| | - Guozhi Huang
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China.
| | - Yiqiu Lin
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
| | - Hongxin Lin
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
| | - Wei Liu
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
| | - Pengcheng Lu
- Rehabilitation Medicine Department, Zhujiang Hospital, Southern Medical University, 253 Industrial Avenue, Guangzhou, Guangdong, China
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Yang GS, Zhou XY, An XF, Liu XJ, Zhang YJ, Yu D. mTOR is involved in stroke-induced seizures and the anti-seizure effect of mild hypothermia. Mol Med Rep 2018; 17:5821-5829. [PMID: 29484389 PMCID: PMC5866026 DOI: 10.3892/mmr.2018.8629] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 10/05/2017] [Indexed: 01/29/2023] Open
Abstract
Stroke is considered an underlying etiology of the development of seizures. Stroke leads to glucose and oxygen deficiency in neurons, resulting in brain dysfunction and injury. Mild hypothermia is a therapeutic strategy to inhibit stroke‑induced seizures, which may be associated with the regulation of energy metabolism of the brain. Mammalian target of rapamycin (mTOR) signaling and solute carrier family 2, facilitated glucose transporter member (GLUT)‑1 are critical for energy metabolism. Furthermore, mTOR overactivation and GLUT‑1 deficiency are associated with genetically acquired seizures. It has been hypothesized that mTOR and GLUT‑1 may additionally be involved in seizures elicited by stroke. The present study established global cerebral ischemia (GCI) models of rats. Convulsive seizure behaviors frequently occurred during the first and the second days following GCI, which were accompanied with seizure discharge reflected in the EEG monitor. Expression of phosphor (p)‑mTOR and GLUT‑1 were upregulated in the cerebral cortex and hippocampus, as evidenced by immunohistochemistry and western blot analyses. Mild hypothermia and/or rapamycin (mTOR inhibitor) treatments reduced the number of epileptic attacks, seizure severity scores and seizure discharges, thereby alleviating seizures induced by GCI. Mild hypothermia and/or rapamycin treatments reduced phosphorylation levels of mTOR and the downstream effecter p70S6 in neurons, and the amount of GLUT‑1 in the cytomembrane of neurons. The present study revealed that mTOR is involved in stroke‑induced seizures and the anti‑seizure effect of mild hypothermia. The role of GLUT‑1 in stroke‑elicited seizures appears to be different from the role in seizures induced by other reasons. Further studies are necessary in order to elucidate the exact function of GLUT-1 in stroke‑elicited seizures.
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Affiliation(s)
- Guo-Shuai Yang
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
| | - Xiao-Yan Zhou
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
| | - Xue-Fang An
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
| | - Xuan-Jun Liu
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
| | - Yan-Jun Zhang
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
| | - Dan Yu
- Department of Neurology, Affiliated Haikou Hospital, Xiangya School of Medicine, Central South University, Haikou, Hainan 570208, P.R. China
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Panisello-Roselló A, Verde E, Lopez A, Flores M, Folch-Puy E, Rolo A, Palmeira C, Hotter G, Carbonell T, Adam R, Roselló-Catafau J. Cytoprotective Mechanisms in Fatty Liver Preservation against Cold Ischemia Injury: A Comparison between IGL-1 and HTK. Int J Mol Sci 2018; 19:ijms19020348. [PMID: 29364854 PMCID: PMC5855570 DOI: 10.3390/ijms19020348] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 01/16/2018] [Accepted: 01/19/2018] [Indexed: 12/17/2022] Open
Abstract
Institute Goeorges Lopez 1 (IGL-1) and Histidine-Tryptophan-Ketoglutarate (HTK) preservation solutions are regularly used in clinical for liver transplantation besides University of Wisconsin (UW) solution and Celsior. Several clinical trials and experimental works have been carried out comparing all the solutions, however the comparative IGL-1 and HTK appraisals are poor; especially when they deal with the underlying protection mechanisms of the fatty liver graft during cold storage. Fatty livers from male obese Zücker rats were conserved for 24 h at 4 °C in IGL-1 or HTK preservation solutions. After organ recovery and rinsing of fatty liver grafts with Ringer Lactate solution, we measured the changes in mechanistic target of rapamycin (mTOR) signaling activation, liver autophagy markers (Beclin-1, Beclin-2, LC3B and ATG7) and apoptotic markers (caspase 3, caspase 9 and TUNEL). These determinations were correlated with the prevention of liver injury (aspartate and alanine aminostransferase (AST/ALT), histology) and mitochondrial damage (glutamate dehydrogenase (GLDH) and confocal microscopy findings). Liver grafts preserved in IGL-1 solution showed a marked reduction on p-TOR/mTOR ratio when compared to HTK. This was concomitant with significant increased cyto-protective autophagy and prevention of liver apoptosis, including inflammatory cytokines such as HMGB1. Together, our results revealed that IGL-1 preservation solution better protected fatty liver grafts against cold ischemia damage than HTK solution. IGL-1 protection was associated with a reduced liver damage, higher induced autophagy and decreased apoptosis. All these effects would contribute to limit the subsequent extension of reperfusion injury after graft revascularization in liver transplantation procedures.
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Affiliation(s)
- Arnau Panisello-Roselló
- Experimental Hepatic Ischemia-Reperfusion Unit, Institut d'Investigacions Biomèdiques de Barcelona (IIBB), Spanish National Research Council (CSIC), 08036 Barcelona, Catalonia, Spain.
| | - Eva Verde
- Department of Cell Biology, Physiology and Immunology, Universitat de Barcelona, Barcelona, 08028 Catalonia, Spain.
| | - Alexandre Lopez
- Centre Hépato-Biliaire, AP-PH, Hôpital Paul Brousse, 94800 Villejuif, France.
| | - Marta Flores
- Department of Cell Biology, Physiology and Immunology, Universitat de Barcelona, Barcelona, 08028 Catalonia, Spain.
| | - Emma Folch-Puy
- Experimental Hepatic Ischemia-Reperfusion Unit, Institut d'Investigacions Biomèdiques de Barcelona (IIBB), Spanish National Research Council (CSIC), 08036 Barcelona, Catalonia, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Catalonia, Spain.
| | - Anabela Rolo
- Center for Neuroscience and Cell Biology, Universidade Coimbra, 3000-370 Coimbra, Portugal.
| | - Carlos Palmeira
- Center for Neuroscience and Cell Biology, Universidade Coimbra, 3000-370 Coimbra, Portugal.
| | - Georgina Hotter
- Experimental Hepatic Ischemia-Reperfusion Unit, Institut d'Investigacions Biomèdiques de Barcelona (IIBB), Spanish National Research Council (CSIC), 08036 Barcelona, Catalonia, Spain.
| | - Teresa Carbonell
- Department of Cell Biology, Physiology and Immunology, Universitat de Barcelona, Barcelona, 08028 Catalonia, Spain.
| | - René Adam
- Centre Hépato-Biliaire, AP-PH, Hôpital Paul Brousse, 94800 Villejuif, France.
| | - Joan Roselló-Catafau
- Experimental Hepatic Ischemia-Reperfusion Unit, Institut d'Investigacions Biomèdiques de Barcelona (IIBB), Spanish National Research Council (CSIC), 08036 Barcelona, Catalonia, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), 08036 Barcelona, Catalonia, Spain.
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Wang JF, Mei ZG, Fu Y, Yang SB, Zhang SZ, Huang WF, Xiong L, Zhou HJ, Tao W, Feng ZT. Puerarin protects rat brain against ischemia/reperfusion injury by suppressing autophagy via the AMPK-mTOR-ULK1 signaling pathway. Neural Regen Res 2018; 13:989-998. [PMID: 29926825 PMCID: PMC6022469 DOI: 10.4103/1673-5374.233441] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Puerarin suppresses autophagy to alleviate cerebral ischemia/reperfusion injury, and accumulating evidence indicates that the AMPK-mTOR signaling pathway regulates the activation of the autophagy pathway through the coordinated phosphorylation of ULK1. In this study, we investigated the mechanisms underlying the neuroprotective effect of puerarin and its role in modulating autophagy via the AMPK-mTOR-ULK1 signaling pathway in the rat middle cerebral artery occlusion model of cerebral ischemia/reperfusion injury. Rats were intraperitoneally injected with puerarin, 50 or 100 mg/kg, daily for 7 days. Then, 30 minutes after the final administration, rats were subjected to transient middle cerebral artery occlusion for 90 minutes. Then, after 24 hours of reperfusion, the Longa score and infarct volume were evaluated in each group. Autophagosome formation was observed by transmission electron microscopy. LC3, Beclin-1 p62, AMPK, mTOR and ULK1 protein expression levels were examined by immunofluorescence and western blot assay. Puerarin substantially reduced the Longa score and infarct volume, and it lessened autophagosome formation in the hippocampal CA1 area following cerebral ischemia/reperfusion injury in a dose-dependent manner. Pretreatment with puerarin (50 or 100 mg/kg) reduced Beclin-1 expression and the LC3-II/LC3-I ratio, as well as p-AMPK and pS317-ULK1 levels. In comparison, it increased p62 expression. Furthermore, puerarin at 100 mg/kg dramatically increased the levels of p-mTOR and pS757-ULK1 in the hippocampus on the ischemic side. Our findings suggest that puerarin alleviates autophagy by activating the APMK-mTOR-ULK1 signaling pathway. Thus, puerarin might have therapeutic potential for treating cerebral ischemia/reperfusion injury.
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Affiliation(s)
- Jin-Feng Wang
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
| | - Zhi-Gang Mei
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
| | - Yang Fu
- Xiangyang Hospital of Traditional Chinese Medicine, Xiangyang, Hubei Province, China
| | - Song-Bai Yang
- Yichang Hospital of Traditional Chinese Medicine, Clinical Medical College of Traditional Chinese Medicine, China Three Gorges University, Yichang, Hubei Province, China
| | - Shi-Zhong Zhang
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
| | - Wei-Feng Huang
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
| | - Li Xiong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong Special Administrative Region, China
| | - Hua-Jun Zhou
- The Institute of Neurology, The First College of Clinical Medical Sciences, China Three Gorges University, Yichang, Hubei Province, China
| | - Wei Tao
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
| | - Zhi-Tao Feng
- Third-Grade Pharmacological Laboratory on Chinese Medicine Approved by State Administration of Traditional Chinese Medicine, Medical College of China Three Gorges University, Yichang, Hubei Province, China
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Wu M, Zhang H, Kai J, Zhu F, Dong J, Xu Z, Wong M, Zeng LH. Rapamycin prevents cerebral stroke by modulating apoptosis and autophagy in penumbra in rats. Ann Clin Transl Neurol 2017; 5:138-146. [PMID: 29468175 PMCID: PMC5817831 DOI: 10.1002/acn3.507] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 10/31/2017] [Accepted: 11/01/2017] [Indexed: 12/13/2022] Open
Abstract
Objective Whether activation or inhibition of the mTOR pathway is beneficial to ischemic injury remains controversial. It may result from the different reaction of ischemic penumbra and core to modulation of mTOR pathway after cerebral ischemia-reperfusion injury in rats. Methods Longa's middle cerebral artery occlusion (MCAO) method was conducted to induce the focal cerebral ischemia-reperfusion. Western blot analysis was used to examine the protein expression involving mTOR pathway, apoptosis, and autophagy-related proteins. TTC staining and Fluoro-Jade B staining was conducted to detect the infarct volume and cell apoptosis, respectively. Neurological function was measured by modified neurological severity score and left-biased swing. Results mTOR signaling pathway was activated in ischemic penumbra and decreased in ischemic core after ischemia and ischemia-reperfusion. Ischemia-reperfusion injury induced the increase in cleaved caspase 9 and caspase 3 both in ischemic penumbra and in ischemic core, whereas the expression of phosphorylated ULK1, Beclin 1 and LC3-II was decreased. Rapamycin pre or postadministration inhibited the overactivation of mTOR pathway in ischemic penumbra. Ameliorated neurological function and reduced infarct volume were observed after pre or postrapamycin treatment. Rapamycin markedly decreased the number of FJB-positive cells and the expression of cleaved caspase-3 and cleaved caspase-9 proteins as well as increased the activation of autophagy reflected by ULK1, Beclin-1 and LC3. Interpretation mTOR signaling pathway was activated in ischemic penumbra after cerebral ischemia-reperfusion injury in rats. mTOR inhibitor rapamycin significantly decreased the mTOR activation and infarct volume and subsequently improved neurological function. These results may relate to inhibition of neuron apoptosis and activation of autophagy.
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Affiliation(s)
- Meiling Wu
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Huadan Zhang
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Jiejing Kai
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Feng Zhu
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Jingyin Dong
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Ziwei Xu
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
| | - Michael Wong
- Department of Neurology School of Medicine Washington University in St. Louis Saint Louis Missouri 63110
| | - Ling-Hui Zeng
- Department of Pharmacology School of Medicine Zhejiang University City College Hangzhou Zhejiang 310015 China
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How AMPK and PKA Interplay to Regulate Mitochondrial Function and Survival in Models of Ischemia and Diabetes. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4353510. [PMID: 29391924 PMCID: PMC5748092 DOI: 10.1155/2017/4353510] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 11/02/2017] [Indexed: 12/17/2022]
Abstract
Adenosine monophosphate-activated protein kinase (AMPK) is a conserved, redox-activated master regulator of cell metabolism. In the presence of oxidative stress, AMPK promotes cytoprotection by enhancing the conservation of energy by suppressing protein translation and by stimulating autophagy. AMPK interplays with protein kinase A (PKA) to regulate oxidative stress, mitochondrial function, and cell survival. AMPK and dual-specificity A-kinase anchoring protein 1 (D-AKAP1), a mitochondrial-directed scaffold of PKA, interact to regulate mitochondrial function and oxidative stress in cardiac and endothelial cells. Ischemia and diabetes, a chronic disease that increases the onset of cardiovascular diseases, suppress the cardioprotective effects of AMPK and PKA. Here, we review the molecular mechanisms by which AMPK and D-AKAP1/PKA interplay to regulate mitochondrial function, oxidative stress, and signaling pathways that prime endothelial cells, cardiac cells, and neurons for cytoprotection against oxidative stress. We discuss recent literature showing how temporal dynamics and localization of activated AMPK and PKA holoenzymes play a crucial role in governing cellular bioenergetics and cell survival in models of ischemia, cardiovascular diseases, and diabetes. Finally, we propose therapeutic strategies that tout localized PKA and AMPK signaling to reverse mitochondrial dysfunction, oxidative stress, and death of neurons and cardiac and endothelial cells during ischemia and diabetes.
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Yuan S, Zhang ZW, Li ZL. Cell Death-Autophagy Loop and Glutamate-Glutamine Cycle in Amyotrophic Lateral Sclerosis. Front Mol Neurosci 2017; 10:231. [PMID: 28785203 PMCID: PMC5519524 DOI: 10.3389/fnmol.2017.00231] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 07/06/2017] [Indexed: 12/11/2022] Open
Abstract
Although we know that amyotrophic lateral sclerosis (ALS) is correlated with the glutamate-mediated corticomotor neuronal hyperexcitability, detailed ALS pathology remains largely unexplained. While a number of drugs have been developed, no cure exists so far. Here, we propose a hypothesis of neuronal cell death—incomplete autophagy positive-feedback loop—and summarize the role of the neuron-astrocyte glutamate-glutamine cycle in ALS. The disruption of these two cycles might ideally retard ALS progression. Cerebrovascular injuries (such as multiple embolization sessions and strokes) induce neuronal cell death and the subsequent autophagy. ALS impairs autophagosome-lysosome fusion and leads to magnified cell death. Trehalose rescues this impaired fusion step, significantly delaying the onset of the disease, although it does not affect the duration of the disease. Therefore, trehalose might be a prophylactic drug for ALS. Given that a major part of neuronal glutamate is converted from glutamine through neuronal glutaminase (GA), GA inhibitors may decrease the neuronal glutamate accumulation, and, therefore, might be therapeutic ALS drugs. Of these, Ebselen is the most promising one with strong antioxidant properties.
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Affiliation(s)
- Shu Yuan
- College of Resources, Sichuan Agricultural UniversityChengdu, China
| | - Zhong-Wei Zhang
- College of Resources, Sichuan Agricultural UniversityChengdu, China
| | - Zi-Lin Li
- Department of Cardiovascular Surgery, General Hospital of Lanzhou Military RegionLanzhou, China
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Shao BZ, Ke P, Xu ZQ, Wei W, Cheng MH, Han BZ, Chen XW, Su DF, Liu C. Autophagy Plays an Important Role in Anti-inflammatory Mechanisms Stimulated by Alpha7 Nicotinic Acetylcholine Receptor. Front Immunol 2017; 8:553. [PMID: 28559895 PMCID: PMC5432615 DOI: 10.3389/fimmu.2017.00553] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 04/25/2017] [Indexed: 12/14/2022] Open
Abstract
Alpha7 nicotinic acetylcholine receptor (α7nAChR) has been reported to alleviate neuroinflammation. Here, we aimed to determine the role of autophagy in α7nAChR-mediated inhibition of neuroinflammation and its underlying mechanism. Experimental autoimmune encephalomyelitis (EAE) mice and lipopolysaccharide-stimulated BV2 microglia were used as in vivo and in vitro models of neuroinflammation, respectively. The severity of EAE was evaluated with neurological scoring. Autophagy-related proteins (Beclin 1, LC3-II/I, p62/SQSTM1) were detected by immunoblot. Autophagosomes were observed using transmission electron microscopy and tandem fluorescent mRFP-GFP-LC3 plasmid was applied to test autophagy flux. The mRNA levels of interleukin-6 (IL-6), IL-1β, IL-18, and tumor necrosis factor-α (TNF-α) were detected by real-time PCR. We used 3-methyladenine (3-MA) and autophagy-related gene 5 small interfering RNA (Atg5 siRNA) to block autophagy in vivo and in vitro, respectively. Activating α7nAChR with PNU282987 ameliorates EAE severity and spinal inflammatory infiltration in EAE mice. PNU282987 treatment also enhanced monocyte/microglia autophagy (Beclin 1, LC3-II/I ratio, p62/SQSTM1, colocalization of CD45- or CD68-positive cells with LC3) both in spinal cord and spleen from EAE mice. The beneficial effects of PNU282987 on EAE mice were partly abolished by 3-MA, an autophagy inhibitor. In vitro, PNU282987 treatment increased autophagy and promoted autophagy flux. Blockade of autophagy by Atg5 siRNA or bafilomycin A1 attenuated the inhibitory effect of PNU282987 on IL-6, IL-1β, IL-18, and TNF-α mRNA. Our results demonstrate for the first time that activating α7nAChR enhances monocyte/microglia autophagy, which suppresses neuroinflammation and thus plays an alleviative role in EAE.
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Affiliation(s)
- Bo-Zong Shao
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Ping Ke
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Zhe-Qi Xu
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Wei Wei
- Institute of Quality and Standard for Agro-Products, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Ming-He Cheng
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Bin-Ze Han
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Xiong-Wen Chen
- Cardiovascular Research Center, Temple University School of Medicine, Philadelphia, PA, USA
| | - Ding-Feng Su
- Department of Pharmacology, Second Military Medical University, Shanghai, China
| | - Chong Liu
- Department of Pharmacology, Second Military Medical University, Shanghai, China
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40
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Pineda-Ramírez N, Gutiérrez Aguilar GF, Espinoza-Rojo M, Aguilera P. Current evidence for AMPK activation involvement on resveratrol-induced neuroprotection in cerebral ischemia. Nutr Neurosci 2017; 21:229-247. [DOI: 10.1080/1028415x.2017.1284361] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Narayana Pineda-Ramírez
- Laboratorio de Patología Vascular Cerebral, Instituto Nacional de Neurología y Neurocirugía ‘Manuel Velasco Suárez’, Ciudad de México, 14269, México
| | - Germán Fernando Gutiérrez Aguilar
- Laboratorio de Patología Vascular Cerebral, Instituto Nacional de Neurología y Neurocirugía ‘Manuel Velasco Suárez’, Ciudad de México, 14269, México
| | - Mónica Espinoza-Rojo
- Laboratorio de Biología Molecular y Genómica, Universidad Autónoma de Guerrero, Chilpancingo, Guerrero, 39087, México
| | - Penélope Aguilera
- Laboratorio de Patología Vascular Cerebral, Instituto Nacional de Neurología y Neurocirugía ‘Manuel Velasco Suárez’, Ciudad de México, 14269, México
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41
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Lloyd BA, Hake HS, Ishiwata T, Farmer CE, Loetz EC, Fleshner M, Bland ST, Greenwood BN. Exercise increases mTOR signaling in brain regions involved in cognition and emotional behavior. Behav Brain Res 2017; 323:56-67. [PMID: 28130174 DOI: 10.1016/j.bbr.2017.01.033] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 01/11/2017] [Accepted: 01/18/2017] [Indexed: 12/21/2022]
Abstract
Exercise can enhance learning and memory and produce resistance against stress-related psychiatric disorders such as depression and anxiety. In rats, these beneficial effects of exercise occur regardless of exercise controllability: both voluntary and forced wheel running produce stress-protective effects. The mechanisms underlying these beneficial effects of exercise remain unknown. The mammalian target of rapamycin (mTOR) is a translation regulator important for cell growth, proliferation, and survival. mTOR has been implicated in enhancing learning and memory as well as antidepressant effects. Moreover, mTOR is sensitive to exercise signals such as metabolic factors. The effects of exercise on mTOR signaling, however, remain unknown. The goal of the present study was to test the hypothesis that exercise, regardless of controllability, increases levels of phosphorylated mTOR (p-mTOR) in brain regions important for learning and emotional behavior. Rats were exposed to 6 weeks of either sedentary (locked wheel), voluntary, or forced wheel running conditions. At 6 weeks, rats were sacrificed during peak running and levels of p-mTOR were measured using immunohistochemistry. Overall, both voluntary and forced exercise increased p-mTOR-positive neurons in the medial prefrontal cortex, striatum, hippocampus, hypothalamus, and amygdala compared to locked wheel controls. Exercise, regardless of controllability, also increased numbers of p-mTOR-positive glia in the striatum, hippocampus, and amygdala. For both neurons and glia, the largest increase in p-mTOR positive cells was observed after voluntary running, with forced exercise causing a more modest increase. Interestingly, voluntary exercise preferentially increased p-mTOR in astrocytes (GFAP+), while forced running increased p-mTOR in microglia (CD11+) in the inferior dentate gyrus. Results suggest that mTOR signaling is sensitive to exercise, but subtle differences exist depending on exercise controllability. Increases in mTOR signaling could contribute to the beneficial effects of exercise on cognitive function and mental health.
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Affiliation(s)
- Brian A Lloyd
- Department of Psychology, University of Colorado Denver, United States
| | - Holly S Hake
- Department of Psychology, University of Colorado Denver, United States
| | | | - Caroline E Farmer
- Department of Psychology, University of Colorado Denver, United States
| | - Esteban C Loetz
- Department of Psychology, University of Colorado Denver, United States
| | - Monika Fleshner
- Department of Integrative Physiology and Center for Neuroscience, University of Colorado Boulder, United States
| | - Sondra T Bland
- Department of Psychology, University of Colorado Denver, United States
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