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Wang J, Yang L, Wu L, Li S, Ren C, Ding Y, Wei M, Ji X, Zhao W. Direct Ischemic Postconditioning Following Stroke Thrombectomy: A Promising Therapy for Reperfusion Injury. Neurosci Bull 2024; 40:1017-1020. [PMID: 38856959 PMCID: PMC11250735 DOI: 10.1007/s12264-024-01243-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Accepted: 03/28/2024] [Indexed: 06/11/2024] Open
Affiliation(s)
- Jing Wang
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Lu Yang
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Longfei Wu
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Sijie Li
- Department of Emergency, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Changhong Ren
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Yuchuan Ding
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, 48201, USA
| | - Ming Wei
- Beijing Institute for Brain Disorders, Capital Medical University, Beijing, 100069, China.
- Department of Neurosurgery, Tianjin Huanhu Hospital, Tianjin, 300222, China.
| | - Xunming Ji
- Beijing Institute for Brain Disorders, Capital Medical University, Beijing, 100069, China.
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China.
| | - Wenbo Zhao
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China.
- Beijing Key Laboratory of Hypoxic Conditioning Translational Medicine, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China.
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Azoulay IS, Qi X, Rozenfeld M, Liu F, Hu Q, Ben Kasus Nissim T, Stavsky A, Zhu MX, Xu TL, Sekler I. ASIC1a senses lactate uptake to regulate metabolism in neurons. Redox Biol 2022; 51:102253. [PMID: 35247821 PMCID: PMC8894274 DOI: 10.1016/j.redox.2022.102253] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 11/25/2022] Open
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Xu D, Kong T, Cheng B, Zhang R, Yang C, Chen J, Wang C. Orexin-A alleviates cerebral ischemia-reperfusion injury by inhibiting endoplasmic reticulum stress-mediated apoptosis. Mol Med Rep 2021; 23:266. [PMID: 33576468 PMCID: PMC7893697 DOI: 10.3892/mmr.2021.11905] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 01/08/2021] [Indexed: 12/12/2022] Open
Abstract
Orexin‑A (OXA) protects neurons against cerebral ischemia‑reperfusion injury (CIRI). Endoplasmic reticulum stress (ERS) induces apoptosis after CIRI by activating caspase‑12 and the CHOP pathway. The present study aimed to determine whether OXA mitigates CIRI by inhibiting ERS‑induced neuronal apoptosis. A model of CIRI was established, in which rats were subjected to middle cerebral artery occlusion with ischemic intervention for 2 h, followed by reperfusion for 24 h. Neurological deficit examination and 2,3,5‑triphenyltetrazolium chloride staining were performed to assess the level of CIRI and neuroprotection by OXA. Expression levels of ERS‑related proteins and cleaved caspase‑3 were measured via western blotting, while the rate of neuronal apoptosis in the cortex was determined using a TUNEL assay. OXA treatment decreased the infarct volume of rats after CIRI and attenuated neuron apoptosis. Furthermore, administration of OXA decreased the expression levels of GRP78, phosphorylated (p)‑PERK, p‑eukaryotic initiation factor‑2α, p‑inositol requiring enzyme 1α, p‑JNK, cleaved caspase‑12, CHOP and cleaved caspase‑3, all of which were induced by CIRI. Collectively, these findings suggested that OXA attenuated CIRI by inhibiting ERS‑mediated apoptosis, thus clarifying the mechanism underlying its neuroprotective effect and providing a novel therapeutic direction for the treatment of CIRI.
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Affiliation(s)
- Dandan Xu
- Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250014, P.R. China
| | - Tingting Kong
- Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250014, P.R. China
| | - Baohua Cheng
- Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, Shandong 272067, P.R. China
| | - Rumin Zhang
- Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, Shandong 272067, P.R. China
| | - Chunqing Yang
- Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, Shandong 272067, P.R. China
| | - Jing Chen
- Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, Shandong 272067, P.R. China
- Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK
| | - Chunmei Wang
- Neurobiology Key Laboratory of Jining Medical University in Colleges of Shandong, Jining, Shandong 272067, P.R. China
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Liu D, Gu Y, Wang W, Chen W. Astragalin alleviates ischemia/reperfusion‑induced brain injury via suppression of endoplasmic reticulum stress. Mol Med Rep 2020; 22:4070-4078. [PMID: 33000226 DOI: 10.3892/mmr.2020.11448] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 07/14/2020] [Indexed: 11/05/2022] Open
Abstract
Excessive apoptosis and neuronal dysfunction are pathological features of ischemic stroke. Previous studies have demonstrated that astragalin (AST) exerted both anti‑apoptotic and anti‑inflammatory effects in several types of disease, although its potential effect in ischemic stroke remains unclear. The purpose of the present study was to investigate the effects of AST on cerebral ischemia/reperfusion (I/R)‑induced brain injury and the underlying mechanisms. Brain injury was assessed in an experimental rat model using measurement of neurological scores and inflammatory factors. To assess the role of AST in I/R‑induced brain injury and the potential mechanism of action, SH5Y were treated with thapsigargin and AST. Apoptotic rate and ER stress levels were measured by western blotting, reverse transcription‑quantitative PCR and immunofluorescence staining. It was discovered that AST significantly improved long‑term neurological outcomes in rats following cerebral I/R injury, through the attenuation of the expression levels of apoptotic proteins (Bax and cleaved‑caspase‑3) and the release of inflammatory cytokines, as well as upregulating the expression levels of the anti‑apoptotic protein Bcl‑2. Furthermore, AST attenuated the expression levels of the endoplasmic reticulum (ER) stress‑related protein, glucose‑regulated protein, 78 kDa, as well as its downstream apoptotic mediators (CHOP and caspase‑12). Thapsigargin‑induced ER stress activation and apoptosis were also attenuated by AST in an in vitro neuronal cell culture model. In conclusion, these results suggested that AST may protect against I/R‑induced brain injury, thus, highlighting its therapeutic potential in patients with ischemic stroke.
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Affiliation(s)
- Desheng Liu
- Department of Anesthesiology, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
| | - Yuntao Gu
- Department of Orthopedic Surgery, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
| | - Wenting Wang
- Department of Anesthesiology, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
| | - Wendao Chen
- Department of Anesthesiology, The Second Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570100, P.R. China
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Wang M, Lee H, Elkin K, Bardhi R, Guan L, Chandra A, Geng X, Ding Y. Detrimental and Beneficial Effect of Autophagy and a Potential Therapeutic Target after Ischemic Stroke. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE : ECAM 2020; 2020:8372647. [PMID: 33688357 PMCID: PMC7924073 DOI: 10.1155/2020/8372647] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 08/14/2020] [Accepted: 09/08/2020] [Indexed: 12/20/2022]
Abstract
Autophagy, a physiologic mechanism that promotes energy recycling and orderly degradation through self-regulated disassembly of cellular components, helps maintain homeostasis. A series of evidences suggest that autophagy is activated as a response to ischemia and has been well-characterized as a therapeutic target. However, the role of autophagy after ischemia remains controversial. Activated-autophagy can remove necrotic substances against ischemic injury to promote cell survival. On the contrary, activation of autophagy may further aggravate ischemic injury, causing cell death. Therefore, the present review will examine the current understanding of the precise mechanism and role of autophagy in ischemia and recent neuroprotective therapies on autophagy, drug therapies, and nondrug therapies, including electroacupuncture (EA).
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Affiliation(s)
- Meng Wang
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China
- Department of Neurology, Beijing Luhe Hospital, Capital Medical University, Beijing, China
| | - Hangil Lee
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
| | - Kenneth Elkin
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
| | - Redina Bardhi
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
| | - Longfei Guan
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
- Department of Research & Development Center, John D. Dingell VA Medical Center, Detroit, MI, USA
| | - Ankush Chandra
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
| | - Xiaokun Geng
- China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical University, Beijing, China
- Department of Neurology, Beijing Luhe Hospital, Capital Medical University, Beijing, China
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
| | - Yuchuan Ding
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, MI, USA
- Department of Research & Development Center, John D. Dingell VA Medical Center, Detroit, MI, USA
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Zhai M, Liu C, Li Y, Zhang P, Yu Z, Zhu H, Zhang L, Zhang Q, Wang J, Wang J. Dexmedetomidine inhibits neuronal apoptosis by inducing Sigma-1 receptor signaling in cerebral ischemia-reperfusion injury. Aging (Albany NY) 2019; 11:9556-9568. [PMID: 31682592 PMCID: PMC6874446 DOI: 10.18632/aging.102404] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 10/26/2019] [Indexed: 12/17/2022]
Abstract
Dexmedetomidine is known to alleviate cerebral ischemia-reperfusion injury (CIRI). We established a rat model of CIRI, which exhibited higher neurological deficit scores and a greater number of apoptotic cells in the cerebral ischemic penumbra than controls. Dexmedetomidine reversed the neuronal apoptosis and improved neurological function in this model. We then examined Sigma-1 receptor (Sig-1R) expression on the endoplasmic reticulum (ER) in brain tissues at different reperfusion time points. Sig-1R expression increased with CIRI and decreased with increasing reperfusion times. After 24 hours of reperfusion, dexmedetomidine upregulated Sig-1R expression, and ER stress proteins (GRP78, CHOP, JNK and Caspase-3) were detected in brain tissues with Western blotting. Moreover, GRP78 expression followed a pattern similar to Sig-1R. Dexmedetomidine induced GRP78 expression but inhibited CHOP, Caspase-3 and phosphorylated-JNK expression in brain tissues. A Sig-1R-specific inhibitor reduced GRP78 expression and partially inhibited the upregulation of GRP78 by dexmedetomidine. The inhibitor also increased CHOP and Caspase-3 expression and partially reversed the inhibitory effects of dexmedetomidine on these pro-apoptotic ER stress proteins. These results suggest that dexmedetomidine at least partially inhibits ER stress-induced apoptosis by activating Sig-1R, thereby attenuating brain damage after 24 hours of ischemia-reperfusion.
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Affiliation(s)
- Meili Zhai
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Chong Liu
- Department of Anesthesiology, Central Laboratory, Tianjin 4th Centre Hospital, The Fourth Central Hospital Affiliated to Nankai University, Tianjin 300140, China
| | - Yuexiang Li
- Department of Anesthesiology, Tianjin Xiqing Hospital, Tianjin 300380, China
| | - Peijun Zhang
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Zhiqiang Yu
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - He Zhu
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Li Zhang
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Qian Zhang
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Jianbo Wang
- Department of Anesthesiology, Tianjin Central Hospital of Gynecology Obstetrics, Gynecology Obstetrics Hospital of Nankai University, Tianjin Key Laboratory of Human Development and Reproductive Regulation, Tianjin 300052, China
| | - Jinhua Wang
- Department of Neurology, Taizhou Central Hospital (Taizhou University Hospital), Taizhou, Zhejiang Province 318000, China
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Exposing immature hippocampal neurons to excitotoxins reveals distinct transcriptome and protein regulation with induction of common survival signaling pathways. Mol Cell Neurosci 2019; 98:54-69. [PMID: 31085233 DOI: 10.1016/j.mcn.2019.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 03/25/2019] [Accepted: 05/08/2019] [Indexed: 11/22/2022] Open
Abstract
Early life traumas lead to neuroprotection by preconditioning mechanisms. To determine which genes and pathways are most likely involved in specific adaptive effects, immature hippocampal cultures were exposed to a single high dose of glutamate (250 μM), NMDA (100 μM), or KA (300 μM) for 48 h (5-7 DIV) based on our prior "two hit" in vitro model of preconditioning. Transcriptome profiling and immunocytochemistry of gene candidates were performed 7 days later when cultured neurons mature (14 DIV). Many genes were up- and down- regulated involving distinct Ca2+-binding protein families, G-coupled proteins, various growth factors, synaptic vesicle docking factors, certain neurotransmitter receptors, heat shock, oxidative stress, and certain anti-apoptotic Bcl-2 gene members that influence neuronal survival. Immunohistochemistry showed a marked decrease in the number of Calb1 and Calm2 positive neurons following NMDA but not after glutamate exposure whereas ryanodine and Cav1.2 voltage gated channel expression was less affected. Survivors had marked increases in Calm2 immunostaining; however, high-density neural clusters observed in controls, were depleted after NMDA and partly diminished after glutamate. While NR1 mRNA expression was decreased in the microarray, specific antibodies revealed selective loss of the NR1C1 splice variant. Calm2 which can inactivate NMDA receptors by binding to C1 but not C2 regions of its NR1 subunit suggests that loss of the C1 splice variant will reduce co-regulation with Calm2 and alter NR1 trafficking, phosphorylation, and NMDA currents following early life NMDA exposure. A dramatic reduction in the density of GABAAα5 and GABAB receptor expressing neurons was observed after NMDA exposure but immunodensity measurements were unchanged as was the expression of the GABA synthesizing enzyme, GAD, suggesting that fast inhibitory neurotransmission and response to benzodiazepines and GABAB-mediated IPSPs may be preserved in matured survivors. Selective upregulation of Chat and CNRIP was detected after glutamate treatment suggesting this condition would decrease cholinergic and excitatory neurotransmission by decreasing Ach content and CB1 interacting protein function. This decrease likely contributes to memory and attention tasks deficits that follow a single early neurological insult. Diverse changes that follow overactivation of excitatory networks of immature neurons appear long-lasting or permanent and are expected to have profound effects on network function and adaptive responses to further insult.
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Neuroprotective Mechanism of Hypoxic Post-conditioning Involves HIF1-Associated Regulation of the Pentose Phosphate Pathway in Rat Brain. Neurochem Res 2018; 44:1425-1436. [PMID: 30448928 DOI: 10.1007/s11064-018-2681-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 10/22/2018] [Accepted: 11/11/2018] [Indexed: 01/19/2023]
Abstract
Post-conditioning is exposure of an injured organism to the same harmful factors but of milder intensity which mobilizes endogenous protective mechanisms. Recently, we have developed a novel noninvasive post-conditioning (PostC) protocol involving three sequential episodes of mild hypobaric hypoxia which exerts pronounced neuroprotective action. In particular, it prevents development of pathological cascades caused by severe hypobaric hypoxia (SH) such as cellular loss, lipid peroxidation, abnormal neuroendocrine responses and behavioural deficit in experimental animals. Development of these post-hypoxic pathological effects has been associated with the delayed reduction of hypoxia-inducible factor 1 (HIF1) regulatory α-subunit levels in rat hippocampus, whereas PostC up-regulated it. The present study has been aimed at experimental examination of the hypothesis that intrinsic mechanisms underlying the neuroprotective and antioxidant effects of PostC involves HIF1-dependent stimulation of the pentose phosphate pathway (PPP). We have observed that SH leads to a decrease of glucose-6-phosphate dehydrogenase (G6PD) activity in the hippocampus and neocortex of rats as well as to a reduction in NADPH and total glutathione levels. This depletion of the antioxidant defense system together with excessive lipid peroxidation during the reoxygenation phase resulted in increased oxidative stress and massive cellular death observed after SH. In contrast, PostC led to normalization of G6PD activity, stabilization of the NADPH and total glutathione levels and thereby resulted in recovery of the cellular redox state and prevention of neuronal death. Our data suggest that stabilization of the antioxidant system via HIF1-associated PPP regulation represents an important neuroprotective mechanism enabled by PostC.
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Zhang W, Liu X, Li Q. Protective Effects of Oleuropein Against Cerebral Ischemia/Reperfusion by Inhibiting Neuronal Apoptosis. Med Sci Monit 2018; 24:6587-6598. [PMID: 30230477 PMCID: PMC6158998 DOI: 10.12659/msm.912336] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND In this study, we investigated the potential neuroprotective effect of oleuropein (OLE) on apoptotic changes via modulating Akt/glycogen synthase kinase 3 beta (Akt/GSK-3b) signaling in a rat model of cerebral ischemia/reperfusion injury (IRI). MATERIAL AND METHODS Sprague-Dawley male rats (12 weeks, n=200) were randomly assigned to 5 groups: sham group, vehicle (IRI+ vehicle) group, OLE (IRI+OLE) group, OLE+LY294002 (IRI+OLE+LY294002) group, and LY294002(IRI+LY294002) group. The rats were subjected to cerebral ischemia/reperfusion injury (IRI) model and treated once daily for 5 days with vehicle and OLE (100 mg/kg via intraperitoneal injection) after IRI injury. LY294002 (0.3 mg/kg) was intraperitoneally injected once at 30 min after IRI injury. Brain edema, neurological deficit, rotarod latencies, and Morris water maze (MWM) performance were evaluated after IRI. The number of dead cells were assayed by TUNEL staining. Western blot was used to detect the expression of Bcl-2, Bax, cleaved caspase-3 (CC3), neurotrophic factors, and the phosphorylation levels of Akt and GSK-3β. RESULTS Compared with the vehicle group, brain water content, neurological deficits, rotarod latencies, and escape latency following IRI were reduced in the OLE group. Cell apoptosis and reduced neurotrophic factor caused by IRI was also attenuated by OLE. Furthermore, increased p-Akt and decreased p-GSK-3β were caused by OLE, which were associated with decrease of Bax/Bcl-2 ratio and the suppression of Caspase-3 activity after IRI. Importantly, all the beneficial effects of OLE in the vehicle group were abrogated by PI3K inhibitor LY294002. CONCLUSIONS Cerebral ischemia was protected by OLE via suppressing apoptosis through the Akt/GSK-3β pathway and upregulating neurotrophic factor after IRI.
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Affiliation(s)
- Weijing Zhang
- Department of Nursing, Tangshan Gongren Hospital, Tangshan, Hebei, China (mainland)
| | - Xiaogang Liu
- Department of Hepatobiliary Surgery, Tangshan Gongren Hospital, Tangshan, Hebei, China (mainland)
| | - Qiuyue Li
- Department of Nursing, Tangshan Gongren Hospital, Tangshan, Hebei, China (mainland)
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Liu C, Fu Q, Mu R, Wang F, Zhou C, Zhang L, Yu B, Zhang Y, Fang T, Tian F. Dexmedetomidine alleviates cerebral ischemia-reperfusion injury by inhibiting endoplasmic reticulum stress dependent apoptosis through the PERK-CHOP-Caspase-11 pathway. Brain Res 2018; 1701:246-254. [PMID: 30201260 DOI: 10.1016/j.brainres.2018.09.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 08/14/2018] [Accepted: 09/06/2018] [Indexed: 01/07/2023]
Abstract
Dexmedetomidine (Dex) has the neuroprotective effect on cerebral ischemia-reperfusion injury (CIRI). But the mechanism is not yet clear. In this study, we established a model of middle cerebral artery occlusion (MCAO) and treated primary cortical neurons with oxygen glucose deprivation (OGD), followed by Dex treatment. Neurological protection of Dex was then assessed by neurological deficit score, brain edema, TTC staining, TUNEL assay, Western blot analysis, immunohistochemistry, and RT-PCR. The results showed that Dex significantly reduced the neurological deficit score, brain edema and cerebral infarction area due to CIRI. After Dex treatment, the expression levels of ER stress-related apoptosis pathway proteins (GRP78, p-PERK, CHOP and Cleaved-caspase-3) were significantly decreased and the apoptosis of brain cells was also significantly reduced. Immunohistochemistry showed that expression and nuclear localization of CHOP decreased significantly after the application of Dex. The downstream apoptotic protein caspase-11 mediated by PERK-CHOP was also markedly inhibited by Dex. In conclusion, our results suggested that Dex reduced ER stress-induced apoptosis after CIRI. Its protective mechanism may be related to PERK-CHOP-Caspase-11 dependent signaling pathway.
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Affiliation(s)
- Chong Liu
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Qiang Fu
- Department of Critical Care Medicine, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China.
| | - Rong Mu
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Fang Wang
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Chunjing Zhou
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Li Zhang
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Baojin Yu
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Yang Zhang
- Department of Anaesthesiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Tao Fang
- Central Laboratory, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China
| | - Fengshi Tian
- Department of Cardiology, Tianjin Fourth Central Hospital, The Fourth Central Hospital Affiliated to Nankai University, The Fourth Center Clinical College of Tianjin Medical University, Tianjin 300140, China.
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RTN1-C mediates cerebral ischemia/reperfusion injury via ER stress and mitochondria-associated apoptosis pathways. Cell Death Dis 2017; 8:e3080. [PMID: 28981095 PMCID: PMC5680587 DOI: 10.1038/cddis.2017.465] [Citation(s) in RCA: 165] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 07/27/2017] [Accepted: 08/17/2017] [Indexed: 01/15/2023]
Abstract
The reticulon family has been found to induce apoptosis, inhibit axon regeneration and regulate protein trafficking. However, little is known about the mechanisms of how reticulon proteins are involved in neuronal death-promoting processes during ischemia. Here, we report that the expression of Reticulon Protein 1-C (RTN1-C) was associated with the progression of cerebral ischemia/reperfusion (I/R) injury. Using a combination of rat middle cerebral artery occlusion (MCAO) stroke and oxygen-glucose deprivation followed by reoxygenation (OGD/R) models, we determined that the expression of RTN1-C was significantly increased during cerebral ischemic/reperfusion. RTN1-C overexpression induced apoptosis and increased the cell vulnerability to ischemic injury, whereas RTN1-C knockdown reversed ischemia-induced apoptosis and attenuated the vulnerability of OGD/R-treated neural cells. Mechanistically, we demonstrated that RTN1-C mediated OGD/R-induced apoptosis through ER stress and mitochondria-associated pathways. RTN1-C interacted with Bcl-xL and increased its localization in the ER, thus reducing the anti-apoptotic activity of Bcl-xL. Most importantly, knockdown of Rtn1-c expression in vivo attenuated apoptosis in MCAO rats and reduced the extent of I/R-induced brain injury, as assessed by infarct volume and neurological score. Collectively, these data support for the first time that RTN1-C may represent a novel candidate for therapies against cerebral ischemia/reperfusion injury.
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Chen JL, Duan WJ, Luo S, Li S, Ma XH, Hou BN, Cheng SY, Fang SH, Wang Q, Huang SQ, Chen YB. Ferulic acid attenuates brain microvascular endothelial cells damage caused by oxygen-glucose deprivation via punctate-mitochondria-dependent mitophagy. Brain Res 2017; 1666:17-26. [DOI: 10.1016/j.brainres.2017.04.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 03/19/2017] [Accepted: 04/14/2017] [Indexed: 12/26/2022]
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Gulati P, Singh N. Evolving possible link between PI3K and NO pathways in neuroprotective mechanism of ischemic postconditioning in mice. Mol Cell Biochem 2014; 397:255-65. [DOI: 10.1007/s11010-014-2193-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 08/13/2014] [Indexed: 01/22/2023]
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