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Lyu Y, Meng Z, Hu Y, Jiang B, Yang J, Chen Y, Zhou J, Li M, Wang H. Mechanisms of mitophagy and oxidative stress in cerebral ischemia-reperfusion, vascular dementia, and Alzheimer's disease. Front Mol Neurosci 2024; 17:1394932. [PMID: 39169952 PMCID: PMC11335644 DOI: 10.3389/fnmol.2024.1394932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Accepted: 07/23/2024] [Indexed: 08/23/2024] Open
Abstract
Neurological diseases have consistently represented a significant challenge in both clinical treatment and scientific research. As research has progressed, the significance of mitochondria in the pathogenesis and progression of neurological diseases has become increasingly prominent. Mitochondria serve not only as a source of energy, but also as regulators of cellular growth and death. Both oxidative stress and mitophagy are intimately associated with mitochondria, and there is mounting evidence that mitophagy and oxidative stress exert a pivotal regulatory influence on the pathogenesis of neurological diseases. In recent years, there has been a notable rise in the prevalence of cerebral ischemia/reperfusion injury (CI/RI), vascular dementia (VaD), and Alzheimer's disease (AD), which collectively represent a significant public health concern. Reduced levels of mitophagy have been observed in CI/RI, VaD and AD. The improvement of associated pathology has been demonstrated through the increase of mitophagy levels. CI/RI results in cerebral tissue ischemia and hypoxia, which causes oxidative stress, disruption of the blood-brain barrier (BBB) and damage to the cerebral vasculature. The BBB disruption and cerebral vascular injury may induce or exacerbate VaD to some extent. In addition, inadequate cerebral perfusion due to vascular injury or altered function may exacerbate the accumulation of amyloid β (Aβ) thereby contributing to or exacerbating AD pathology. Intravenous tissue plasminogen activator (tPA; alteplase) and endovascular thrombectomy are effective treatments for stroke. However, there is a narrow window of opportunity for the administration of tPA and thrombectomy, which results in a markedly elevated incidence of disability among patients with CI/RI. It is regrettable that there are currently no there are still no specific drugs for VaD and AD. Despite the availability of the U.S. Food and Drug Administration (FDA)-approved clinical first-line drugs for AD, including memantine, donepezil hydrochloride, and galantamine, these agents do not fundamentally block the pathological process of AD. In this paper, we undertake a review of the mechanisms of mitophagy and oxidative stress in neurological disorders, a summary of the clinical trials conducted in recent years, and a proposal for a new strategy for targeted treatment of neurological disorders based on both mitophagy and oxidative stress.
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Affiliation(s)
- Yujie Lyu
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Zhipeng Meng
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Yunyun Hu
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Bing Jiang
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Jiao Yang
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Yiqin Chen
- Gansu University of Chinese Medicine, Lanzhou, China
| | - Jun Zhou
- Xichang Hospital of Traditional Chinese Medicine, Xichang, China
| | - Mingcheng Li
- Qujing 69 Hospital, China RongTong Medical Healthcare Group Co. Ltd, Qujing, China
| | - Huping Wang
- Gansu University of Chinese Medicine, Lanzhou, China
- Key Laboratory of Traditional Chinese Herbs and Prescription Innovation and Transformation of Gansu Province, Lanzhou, China
- Laboratory for TCM New Products Development Engineering of Gansu Province, Lanzhou, China
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2
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Gao HM, Chen H, Cui GY, Hu JX. Damage mechanism and therapy progress of the blood-brain barrier after ischemic stroke. Cell Biosci 2023; 13:196. [PMID: 37915036 PMCID: PMC10619327 DOI: 10.1186/s13578-023-01126-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 09/04/2023] [Indexed: 11/03/2023] Open
Abstract
The blood-brain barrier (BBB) serves as a defensive line protecting the central nervous system, while also maintaining micro-environment homeostasis and inhibiting harmful materials from the peripheral blood. However, the BBB's unique physiological functions and properties make drug delivery challenging for patients with central nervous system diseases. In this article, we briefly describe the cell structure basis and mechanism of action of the BBB, as well as related functional proteins involved. Additionally, we discuss the various mechanisms of BBB damage following the onset of an ischemic stroke, and lastly, we mention several therapeutic strategies accounting for impairment mechanisms. We hope to provide innovative ideas for drug delivery research via the BBB.
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Affiliation(s)
- Hui-Min Gao
- Institute of Stroke Research, Xuzhou Medical University, Jiangsu, China
| | - Hao Chen
- Department of Neurology, The Affiliated Hospital of Xuzhou Medical University, Jiangsu, China
| | - Gui-Yun Cui
- Institute of Stroke Research, Xuzhou Medical University, Jiangsu, China
- Department of Neurology, The Affiliated Hospital of Xuzhou Medical University, Jiangsu, China
| | - Jin-Xia Hu
- Institute of Stroke Research, Xuzhou Medical University, Jiangsu, China.
- Department of Neurology, The Affiliated Hospital of Xuzhou Medical University, Jiangsu, China.
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China.
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3
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Lin W, Zhao XY, Cheng JW, Li LT, Jiang Q, Zhang YX, Han F. Signaling pathways in brain ischemia: Mechanisms and therapeutic implications. Pharmacol Ther 2023; 251:108541. [PMID: 37783348 DOI: 10.1016/j.pharmthera.2023.108541] [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: 06/11/2023] [Revised: 09/18/2023] [Accepted: 09/25/2023] [Indexed: 10/04/2023]
Abstract
Ischemic stroke occurs when the arteries supplying blood to the brain are narrowed or blocked, inducing damage to brain tissue due to a lack of blood supply. One effective way to reduce brain damage and alleviate symptoms is to reopen blocked blood vessels in a timely manner and reduce neuronal damage. To achieve this, researchers have focused on identifying key cellular signaling pathways that can be targeted with drugs. These pathways include oxidative/nitrosative stress, excitatory amino acids and their receptors, inflammatory signaling molecules, metabolic pathways, ion channels, and other molecular events involved in stroke pathology. However, evidence suggests that solely focusing on protecting neurons may not yield satisfactory clinical results. Instead, researchers should consider the multifactorial and complex mechanisms underlying stroke pathology, including the interactions between different components of the neurovascular unit. Such an approach is more representative of the actual pathological process observed in clinical settings. This review summarizes recent research on the multiple molecular mechanisms and drug targets in ischemic stroke, as well as recent advances in novel therapeutic strategies. Finally, we discuss the challenges and future prospects of new strategies based on the biological characteristics of stroke.
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Affiliation(s)
- Wen Lin
- Medical Basic Research Innovation Center for Cardiovascular and Cerebrovascular Diseases, Ministry of Education, China; International Joint Laboratory for Drug Target of Critical Illnesses, Key Laboratory of Cardiovascular and Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Xiang-Yu Zhao
- Medical Basic Research Innovation Center for Cardiovascular and Cerebrovascular Diseases, Ministry of Education, China; International Joint Laboratory for Drug Target of Critical Illnesses, Key Laboratory of Cardiovascular and Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Jia-Wen Cheng
- Department of Physiology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing 211166, China
| | - Li-Tao Li
- Department of Neurology, Hebei General Hospital, Shijiazhuang 050051, Hebei, China
| | - Quan Jiang
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Yi-Xuan Zhang
- Medical Basic Research Innovation Center for Cardiovascular and Cerebrovascular Diseases, Ministry of Education, China; International Joint Laboratory for Drug Target of Critical Illnesses, Key Laboratory of Cardiovascular and Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China; Gusu School, Nanjing Medical University, Suzhou Municipal Hospital, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou 215002, China.
| | - Feng Han
- Medical Basic Research Innovation Center for Cardiovascular and Cerebrovascular Diseases, Ministry of Education, China; International Joint Laboratory for Drug Target of Critical Illnesses, Key Laboratory of Cardiovascular and Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China; Gusu School, Nanjing Medical University, Suzhou Municipal Hospital, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou 215002, China; Institute of Brain Science, the Affiliated Brain Hospital of Nanjing Medical University, Nanjing 211166, China.
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4
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Zhao K, Wang P, Tang X, Chang N, Shi H, Guo L, Wang B, Yang P, Zhu T, Zhao X. The mechanisms of minocycline in alleviating ischemic stroke damage and cerebral ischemia-reperfusion injury. Eur J Pharmacol 2023; 955:175903. [PMID: 37422120 DOI: 10.1016/j.ejphar.2023.175903] [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: 05/03/2023] [Revised: 06/08/2023] [Accepted: 07/05/2023] [Indexed: 07/10/2023]
Abstract
Stroke is a group of diseases resulting from cerebral vascular rupture or obstruction and subsequent brain blood circulation disorder, leading to rapid neurological deficits. Ischemic stroke accounts for the majority of all stroke cases. The current treatments for ischemic stroke mainly include t-PA thrombolytic therapy and surgical thrombectomy. However, these interventions aimed at recanalizing cerebral vessels can paradoxically lead to ischemia-reperfusion injury, which exacerbates the severity of brain damage. Minocycline, a semi-synthetic tetracycline antibiotic, has been shown to possess a wide range of neuroprotective effects independent of its antibacterial activity. Here we summarize the mechanisms underlying the protective effects of minocycline against cerebral ischemia-reperfusion injury based on the pathogenesis of cerebral ischemia-reperfusion injury, including its modulation of oxidative stress, inflammatory response, excitotoxicity, programmed cell death and blood-brain barrier injury, and also introduce the role of minocycline in alleviating stroke-related complications, in order to provide a theoretical basis for the clinical application of minocycline in cerebral ischemia-reperfusion injury.
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Affiliation(s)
- Kemeng Zhao
- Basic Medical College, Xinxiang Medical University, Xinxiang, China; College of First Clinical, Xinxiang Medical University, Xinxiang, China
| | - Pengwei Wang
- Department of Pharmacy, The First Affiliated Hospital of Xinxiang Medical University, No. 88 Jiankang Road, Weihui, 453100, Henan, China
| | - Xiaoguang Tang
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China
| | - Na Chang
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China
| | - Haonan Shi
- Sanquan Medical College, Xinxiang Medical University, Xinxiang, China
| | - Longfei Guo
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China
| | - Bingyi Wang
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China
| | - Pengfei Yang
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China.
| | - Tiantian Zhu
- College of Pharamacy, Xinxiang Medical University, Henan International Joint Laboratory of Cardiovascular Remodeling and Drug Intervention, Xinxiang Key Laboratory of Vascular Remodeling Intervention and Molecular Targeted Therapy Drug Development, Xinxiang, China.
| | - Xinghua Zhao
- Basic Medical College, Xinxiang Medical University, Xinxiang, China.
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Liang E, Xiao S, Zhao C, Zhang Y, Fu G. M6A modification promotes blood-brain barrier breakdown during cerebral ischemia/reperfusion injury through increasing matrix metalloproteinase 3 expression. Heliyon 2023; 9:e16905. [PMID: 37332938 PMCID: PMC10275791 DOI: 10.1016/j.heliyon.2023.e16905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 04/26/2023] [Accepted: 05/31/2023] [Indexed: 06/20/2023] Open
Abstract
Blood-brain barrier (BBB) breakdown is a critical event in cerebral ischemia-reperfusion (I/R) injury, and matrix metalloproteinases (MMPs), which are proteolytic enzymes, play essential roles in BBB breakdown through degrading the extracellular matrix. N6-Methyladenosine (m6A), the most common and reversible mRNA modification, has an important role in the progression of cerebral I/R injury. However, whether m6A is related to BBB breakdown and MMPs expression in cerebral I/R injury is still not clear. In this study, we explored the potential effects of m6A modification on BBB breakdown in cerebral I/R injury and its underlying mechanisms using mice subjected to transient middle cerebral artery occlusion and reperfusion (MCAO/R), and mouse brain endothelial cells treated with oxygen-glucose deprivation and reoxygenation (OGD/R). We find that MMP3 expression is highly expressed and positively associated with the m6A writer CBLL1 (Cbl proto-oncogene like 1) in cerebral I/R injury in vivo and in vitro. Furthermore, MMP3 mRNA occurs m6A modification in mouse brain endothelial cells, and the m6A modification level of MMP3 mRNA is significantly increased in cerebral I/R injury. Moreover, inhibition of m6A modification reduces MMP3 expression and ameliorates BBB breakdown in cerebral I/R in vivo and in vitro. In conclusion, m6A modification promotes BBB breakdown in cerebral I/R injury through increasing MMP3 expression, indicating that m6A may be a potential therapeutic target for cerebral I/R injury.
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Affiliation(s)
- En Liang
- Department of Neurosurgery, Guangzhou PanYu He Xian Memorial Hospital, Guangzhou, 511442, PR China
| | - Shaorong Xiao
- Centre for Integrative Medicine, School of Basic Medical Science, Guangzhou University of Chinese Medicine, Guangzhou, 510006, PR China
| | - Changtong Zhao
- Department of Neurosurgery, Guangzhou PanYu He Xian Memorial Hospital, Guangzhou, 511442, PR China
| | - Yu Zhang
- Shenzhen Bao'an Traditional Chinese Medicine Hospital, Guangzhou University of Chinese Medicine, Shenzhen, 518133, PR China
| | - Guanglei Fu
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, 510630, PR China
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6
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Li H, Xiao G, Tan X, Liu G, Xu Y, Gu S. Human umbilical cord blood mononuclear cells ameliorate ischemic brain injury via promoting microglia/macrophages M2 polarization in MCAO Rats. Exp Brain Res 2023; 241:1585-1598. [PMID: 37142782 DOI: 10.1007/s00221-023-06600-1] [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: 02/03/2023] [Accepted: 03/13/2023] [Indexed: 05/06/2023]
Abstract
Cerebral infarction is one of the most prevalent cerebrovascular disorders. Microglia and infiltrating macrophages play a key role in regulating the inflammatory response after ischemic stroke. Regulation of microglia/macrophages polarization contributes to the recovery of neurological function in cerebral infarction. In recent decades, human umbilical cord blood mononuclear cells (hUCBMNCs) have been considered a potential therapeutic alternative. However, the mechanism of action is yet unclear. Our study aimed to explore whether hUCBMNCs treatment for cerebral infarction is via regulation of microglia/macrophages polarization. Adult male Sprague-Dawley rats were subjected to middle cerebral artery occlusion (MCAO) and were treated by intravenous routine with or without hUCBMNCs at 24 h following MCAO. We evaluated the therapeutic effects of hUCBMNCs on cerebral infarction by measuring animal behavior and infarct volume, and further explored the possible mechanisms of hUCBMNCs for cerebral infarction by measuring inflammatory factors and microglia/macrophages markers using Elisa and immunofluorescence staining, respectively. We found that administration with hUCBMNCs improved behavioral functions and reduced infarct volume. Rats treated with hUCBMNCs showed a significant reduction in the level of IL-6, and TNF-α and increased the level of IL-4 and IL-10 compared to those treated without hUCBMNCs. Furthermore, hUCBMNCs inhibited M1 polarization and promoted M2 polarization of microglia/macrophages after MCAO. We conclude that hUCBMNCs could ameliorate cerebral brain injury by promoting microglia/macrophages M2 polarization in MCAO Rats. This experiment provides evidence that hUCBMNCs represent a promising therapeutic option for ischemic stroke.
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Affiliation(s)
- Hongmei Li
- Department of Neurology, the Third Xiangya Hospital of Central South University, 138 Tongzipo Road, Changsha, 410013, Hunan, China
| | - Gai Xiao
- Department of Neurology, the Third Xiangya Hospital of Central South University, 138 Tongzipo Road, Changsha, 410013, Hunan, China
| | - Xiao Tan
- Department of Neurology, the Third Xiangya Hospital of Central South University, 138 Tongzipo Road, Changsha, 410013, Hunan, China
| | - Guojun Liu
- Shandong Cord Blood Bank, Jinan, Shangdong, China
| | - Yangzhou Xu
- Department of Neurology, the Third Xiangya Hospital of Central South University, 138 Tongzipo Road, Changsha, 410013, Hunan, China
| | - Shaojuan Gu
- Department of Neurology, the Third Xiangya Hospital of Central South University, 138 Tongzipo Road, Changsha, 410013, Hunan, China.
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7
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Tang X, Xie S, Wang H, Li Y, Lai Z, Sun S, Pan R, Huang Y, Cai J. The combination of Astragalus membranaceus and ligustrazine mitigates cerebral ischemia-reperfusion injury via regulating NR2B-ERK/CREB signaling. Brain Behav 2023; 13:e2867. [PMID: 36585899 PMCID: PMC9927841 DOI: 10.1002/brb3.2867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 09/17/2022] [Accepted: 12/08/2022] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND AND PURPOSE Cerebral ischemia-reperfusion (I/R) injury is a major factor underlying the high mortality and morbidity rates in stroke patients. Our previous study found that the combination of Astragalus membranaceus extract and ligustrazine (Ast+Lig) treatment could protect brain tissues against inflammation in rats with thrombolytic cerebral ischemia. Activation of N-methyl-D-aspartate receptors (NMDAR) is implicated in brain damage induced by cerebral I/R injury. METHODS We used in vivo and in vitro models of cerebral I/R injury for middle cerebral artery occlusion/reperfusion in mice and oxygen-glucose deprivation/reoxygenation in primary rat cerebral cortical neurons to evaluate the protective effects of Ast+Lig on cerebral I/R injury, and whether the protective mechanism was related to the regulation of NMDAR-ERK/CREB signaling. RESULTS Treatment with Ast+Lig, or MK-801 (an inhibitor of NMDAR) significantly ameliorated neurological deficits, decreased infarct volumes, suppressed neuronal damage and Ca2+ influx, and maintained the mitochondrial membrane potential in vivo and in vitro following cerebral I/R injury based on 2,3,5-triphenyl tetrazolium chloride staining, immunohistochemistry, and immunofluorescent staining. Furthermore, treatment with Ast+Lig evidently prevented the upregulation of NR2B, but not NR2A, in vivo and in vitro following cerebral I/R injury based on western blotting and reverse transcription-quantitative PCR analyses. Moreover, treatment with Ast+Lig significantly increased the phosphorylation of ERK and CREB, as well as increasing their mRNA expression levels in vivo and in vitro following cerebral I/R injury. CONCLUSIONS The overall results thus suggest that the Ast+Lig combination conferred neuroprotective properties against cerebral I/R injury via regulation of the NR2B-ERK/CREB signaling pathway.
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Affiliation(s)
- Xialing Tang
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Hubei Provincial Hospital of Chinese Medicine, Wuhan, China
| | - Shanshan Xie
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Huajun Wang
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Yingbin Li
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China.,Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Zhiyu Lai
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Shuangxi Sun
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Ruanhuan Pan
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Yan Huang
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
| | - Jun Cai
- The Second Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Diagnosis and Treatment Center of Encephalopathy, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China.,Department of Neurosurgery, Hospital of Guangzhou University Mega Center, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou, China
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8
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The Effect and Mechanism of Syringa pinnatifolia Hemsl. Ligans on Cerebral Ischemia-Reperfusion Injury and Oxidative Stress in Mice. Neurochem Res 2023; 48:1822-1834. [PMID: 36723726 DOI: 10.1007/s11064-022-03855-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 12/16/2022] [Accepted: 12/27/2022] [Indexed: 02/02/2023]
Abstract
Lignans are the main components of Syringa pinnatifolia Hemsl. (SP). Previous studies have shown that SP lignans (SPL) can considerably improve CCl4-induced acute liver injury in mice by the anti-oxidative stress (OS) mechanism. In this study, we investigated the antioxidant effects of SPL on cerebral ischemia/reperfusion injury (CIRI) and its underlying molecular mechanism. We developed a middle cerebral artery occlusion/reperfusion (MCAO/R) model in mice to achieve CIRI and orally administered SPL daily for 1-3 days. We evaluated neurological function deficits and performed hematoxylin and eosin staining. We further calculated the infarct volume. Malondialdehyde (MDA), superoxide dismutase (SOD), and glutathione peroxidase (GPx) in the brain were detected using corresponding kits. The transcription and protein levels of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase 1 (HO-1), and NAD(P)H quinone dehydrogenase 1 (NQO1) in brain tissues were analyzed by real-time reverse transcription polymerase chain reaction and western blotting, respectively. The results showed that SPL could remarkably ameliorate neurological functions and pathological damage in brain tissues, reducing the cerebral infarct volume. It also increased the SOD and GPx activities decreased the MDA levels as well as inhibited the expression of (NOX)2 and NOX4. We also found that the mRNA and protein levels of Nrf2, HO-1, and NQO1 in the CIRI mice increased transiently and peaked at 24 h of reperfusion, and then began to decline. SPL could reverse decreasing Nrf2 and HO-1 levels after 24 h. In conclusion, SPL can alleviate CIRI and OS by activating the Nrf2/HO-1 pathway.
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9
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Zhang D, Chang R, Ren Y, He Y, Guo S, Guan F, Yao M. Injectable and reactive oxygen species-scavenging gelatin hydrogel promotes neural repair in experimental traumatic brain injury. Int J Biol Macromol 2022; 219:844-863. [PMID: 35961554 DOI: 10.1016/j.ijbiomac.2022.08.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/27/2022] [Accepted: 08/06/2022] [Indexed: 12/26/2022]
Abstract
Oxidative stress caused by the overexpression of reactive oxygen species (ROS) plays an important role in the pathogenesis of traumatic brain injury (TBI). Accumulation of ROS can lead to cell death, neurodegeneration, and neurological deficit. Therefore, the design and application of functional materials with ROS scavenging ability is of great significance for neural repair. Herein, an injectable and antioxidant hydrogel was developed for TBI treatment based on the Schiff base reaction of gallic acid-conjugated gelatin (GGA) and oxidized dextran (Odex). The resulting GGA/Odex hydrogel could effectively scavenge DPPH and ABTS radicals, as well as protect cells from the oxidative damage in vitro. Moreover, GGA/Odex hydrogel possessed well biocompatible features. In a moderate TBI mouse model, in situ implantation of GGA6Odex hydrogel efficiently facilitated neurogenesis and promoted the motor, learning and memory abilities. Also, this composite hydrogel suppressed oxidative stress and inflammation via the activation of Nrf2/HO-1 pathway and the regulating of inflammatory factors secretion and macrophage/microglia polarization. Therefore, this injectable and ROS-scavenging GGA6Odex hydrogel is a promising biomaterial for tissue regenerative medicine, including TBI and other tissue repair relevant to raised ROS circumstance.
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Affiliation(s)
- Dan Zhang
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Rong Chang
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Yikun Ren
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Yuanmeng He
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Shen Guo
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China
| | - Fangxia Guan
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China.
| | - Minghao Yao
- School of Life Science, Zhengzhou University, 100 Science Road, Zhengzhou 450001, PR China.
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10
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Liu D, Ji Q, Cheng Y, Liu M, Zhang B, Mei Q, Huan M, Zhou S. Cyclosporine A loaded brain targeting nanoparticle to treat cerebral ischemia/reperfusion injury in mice. J Nanobiotechnology 2022; 20:256. [PMID: 35658867 PMCID: PMC9164331 DOI: 10.1186/s12951-022-01474-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 05/23/2022] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Ischemic stroke is one of the main causes of death and disability in the world. The treatment for ischemic stroke is to restore blood perfusion as soon as possible. However, when ischemic brain tissue is re-perfused by blood, the mitochondrial permeability transition pore (mPTP) in neuron and microglia is excessively opened, resulting in the apoptosis of neuron and nerve inflammation. This aggravates nerve injury. Cyclosporine A (CsA) inhibits the over-opening of mPTP, subsequently reducing the release of ROS and the apoptosis of cerebral ischemia/reperfusion injured neuron and microglia. However, CsA is insoluble in water and present in high concentrations in lymphatic tissue. Herein, cerebral infarction tissue targeted nanoparticle (CsA@HFn) was developed to treat cerebral ischemia/reperfusion injury. RESULTS CsA@HFn efficiently penetrated the blood-brain barrier (BBB) and selectively accumulated in ischemic area, inhibiting the opening of mPTP and ROS production in neuron. This subsequently reduced the apoptosis of neuron and the damage of BBB. Consequently, CsA@HFn significantly reduced the infarct area. Moreover, CsA@HFn inhibited the recruitment of astrocytes and microglia in ischemic region and polarized microglia into M2 type microglia, which subsequently alleviated the nerve inflammation. CONCLUSIONS CsA@HFn showed a significant therapeutic effect on cerebral ischemia/reperfusion injury by alleviating the apoptosis of neuron, nerve inflammation and the damage of BBB in ischemic area. CsA@HFn has great potential in the treatment of ischemic stroke.
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Affiliation(s)
- Daozhou Liu
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Qifeng Ji
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Ying Cheng
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Miao Liu
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Bangle Zhang
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Qibing Mei
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Menglei Huan
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
| | - Siyuan Zhou
- grid.233520.50000 0004 1761 4404Department of Pharmaceutics, School of Pharmacy, Air Force Medical University, Changle West Road 169, Xi’an, 710032 Shaanxi China
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11
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Wang L, Liu Y, Zhang X, Ye Y, Xiong X, Zhang S, Gu L, Jian Z, Wang H. Endoplasmic Reticulum Stress and the Unfolded Protein Response in Cerebral Ischemia/Reperfusion Injury. Front Cell Neurosci 2022; 16:864426. [PMID: 35602556 PMCID: PMC9114642 DOI: 10.3389/fncel.2022.864426] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/07/2022] [Indexed: 12/15/2022] Open
Abstract
Ischemic stroke is an acute cerebrovascular disease characterized by sudden interruption of blood flow in a certain part of the brain, leading to serious disability and death. At present, treatment methods for ischemic stroke are limited to thrombolysis or thrombus removal, but the treatment window is very narrow. However, recovery of cerebral blood circulation further causes cerebral ischemia/reperfusion injury (CIRI). The endoplasmic reticulum (ER) plays an important role in protein secretion, membrane protein folding, transportation, and maintenance of intracellular calcium homeostasis. Endoplasmic reticulum stress (ERS) plays a crucial role in cerebral ischemia pathophysiology. Mild ERS helps improve cell tolerance and restore cell homeostasis; however, excessive or long-term ERS causes apoptotic pathway activation. Specifically, the protein kinase R-like endoplasmic reticulum kinase (PERK), activating transcription factor 6 (ATF6), and inositol-requiring enzyme 1 (IRE1) pathways are significantly activated following initiation of the unfolded protein response (UPR). CIRI-induced apoptosis leads to nerve cell death, which ultimately aggravates neurological deficits in patients. Therefore, it is necessary and important to comprehensively explore the mechanism of ERS in CIRI to identify methods for preserving brain cells and neuronal function after ischemia.
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Affiliation(s)
- Lei Wang
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yan Liu
- Department of Anesthesiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xu Zhang
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yingze Ye
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xiaoxing Xiong
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Shudi Zhang
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Lijuan Gu
- Central Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Zhihong Jian
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
- Zhihong Jian,
| | - Hongfa Wang
- Rehabilitation Medicine Center, Department of Anesthesiology, Zhejiang Provincial People’s Hospital, Affiliated People’s Hospital, Hangzhou Medical College, Hangzhou, China
- *Correspondence: Hongfa Wang,
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12
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Cunha Nascimento P, Alana Bragança Aragão W, Oliveira Bittencourt L, Dionizio A, A. R. Buzalaf M, Crespo-Lopez ME, Lima RR. Maternal methylmercury exposure changes the proteomic profile of the offspring's salivary glands: Prospects on translational toxicology. PLoS One 2021; 16:e0258969. [PMID: 34748590 PMCID: PMC8575261 DOI: 10.1371/journal.pone.0258969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 10/08/2021] [Indexed: 11/19/2022] Open
Abstract
Background Methylmercury (MeHg) remains a public health issue since developing organisms are particularly vulnerable to this environmental contaminant. This study investigated the effect of maternal MeHg exposure on the modulation of proteomic profile of parotid (PA), submandibular (SM), and sublingual (SL) glands of offspring rats. Materials and methods Pregnant Wistar rats were daily exposed to 40 μg/kg MeHg during both gestational and lactation periods. The proteomic profiles of the major salivary glands of the offspring rats were analyzed through mass spectrometry. Results The offspring rats exposed to MeHg showed significant alterations in the proteomic profiles of the PA, SM, and SL glands. Altered proteins were associated with cytoskeleton components, tissue morphogenesis, and response to stimulus and stress. Conclusion This original study showed that maternal MeHg exposure significantly modulates the expression of proteins and induces alterations in the proteomic profiles of developing salivary glands.
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Affiliation(s)
- Priscila Cunha Nascimento
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Para, Belém, PA, Brazil
| | - Walessa Alana Bragança Aragão
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Para, Belém, PA, Brazil
| | - Leonardo Oliveira Bittencourt
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Para, Belém, PA, Brazil
| | - Aline Dionizio
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Marilia A. R. Buzalaf
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, São Paulo, Brazil
| | - Maria Elena Crespo-Lopez
- Laboratory of Molecular Pharmacology, Institute of Biological Sciences, Federal University of Para, Belém, PA, Brazil
| | - Rafael Rodrigues Lima
- Laboratory of Functional and Structural Biology, Institute of Biological Sciences, Federal University of Para, Belém, PA, Brazil
- * E-mail:
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13
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Ge JW, Deng SJ, Xue ZW, Liu PY, Yu LJ, Li JN, Xia SN, Gu Y, Bao XY, Lan Z, Xu Y, Zhu XL. Imperatorin inhibits mitogen-activated protein kinase and nuclear factor kappa-B signaling pathways and alleviates neuroinflammation in ischemic stroke. CNS Neurosci Ther 2021; 28:116-125. [PMID: 34674376 PMCID: PMC8673701 DOI: 10.1111/cns.13748] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 09/29/2021] [Accepted: 10/12/2021] [Indexed: 01/02/2023] Open
Abstract
AIMS Microglia-mediated neuroinflammation plays an important role in the pathological process of ischemic stroke, and the effect of imperatorin on post-stroke neuroinflammation is not fully understood. METHODS Primary microglia were treated with imperatorin for 2 h followed by LPS (100 ng/ml) for 24 h. The expression of inflammatory cytokines was detected by RT-PCR, ELISA, and Western blot. The activation of MAPK and NF-κB signaling pathways were analyzed by Western blot. The ischemic insult was determined using a transient middle cerebral artery occlusion (tMCAO) model in C57BL/6J mice. Behavior tests were used to assess the neurological deficits of MCAO mice. TTC staining was applied to measure infract volume. RESULTS Imperatorin suppressed LPS-induced activation of microglia and pro-inflammatory cytokines release and attenuated ischemic injury in MCAO mice. The results of transcriptome sequencing and Western blot revealed that downregulation of MAPK and NF-κB pathways might contribute to the protective effects of imperatorin. CONCLUSIONS Imperatorin downregulated MAPK and NF-κB signaling pathways and exerted anti-inflammatory effects in ischemic stroke, which indicated that imperatorin might be a potential compound for the treatment of stroke.
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Affiliation(s)
- Jian-Wei Ge
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Shi-Ji Deng
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Zhi-Wei Xue
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Pin-Yi Liu
- Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Lin-Jie Yu
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Jiang-Nan Li
- Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Sheng-Nan Xia
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Yue Gu
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Xin-Yu Bao
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China
| | - Zhen Lan
- Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Yun Xu
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China.,Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
| | - Xiao-Lei Zhu
- Department of Neurology, Drum Tower Hospital, Medical School and The State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, PR China.,Institute of Brain Sciences, Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, Jiangsu, PR China.,Jiangsu Province Stroke Center for Diagnosis and Therapy, Nanjing, Jiangsu, PR China.,Nanjing Neuropsychiatry Clinic Medical Center, Nanjing, Jiangsu, PR China.,Department of Neurology, Drum Tower Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China
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14
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Chi OZ, Liu X, Cofano S, Patel N, Jacinto E, Weiss HR. Rapalink-1 Increased Infarct Size in Early Cerebral Ischemia-Reperfusion With Increased Blood-Brain Barrier Disruption. Front Physiol 2021; 12:706528. [PMID: 34354602 PMCID: PMC8329705 DOI: 10.3389/fphys.2021.706528] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 06/21/2021] [Indexed: 11/13/2022] Open
Abstract
It has been reported that the mechanistic target of rapamycin (mTOR) pathway is involved in cerebral ischemia–reperfusion injury. One of the important pathological changes during reperfusion after cerebral ischemia is disruption of blood–brain barrier (BBB). Rapamycin, a first-generation mTOR inhibitor, produces divergent effects on neuronal survival and alteration in BBB disruption. In this study, we investigated how Rapalink-1, a third-generation mTOR inhibitor, would affect neuronal survival and BBB disruption in the very early stage of cerebral ischemia–reperfusion that is within the time window of thrombolysis therapy. The middle cerebral artery occlusion (MCAO) was performed in rats under isoflurane anesthesia with controlled ventilation. Of note, 2 mg/kg of Rapalink-1 or vehicle was administered intraperitoneally 10 min after MCAO. After 1 h of MCAO and 2 h of reperfusion, the transfer coefficient (Ki) of 14C-α-aminoisobutyric acid (104 Da) and the volume of 3H-dextran (70,000 Da) distribution were determined to assess the degree of BBB disruption. At the same time points, phosphorylated S6 (Ser240/244) and Akt (Ser473) as well as matrix metalloproteinase-2 (MMP2) protein level were determined by Western blot along with the infarct size using tetrazolium stain. Rapalink-1 increased the Ki in the ischemic-reperfused cortex (IR-C, +23%, p < 0.05) without a significant change in the volume of dextran distribution. Rapalink-1 increased the percentage of cortical infarct out of the total cortical area (+41%, p < 0.005). Rapalink-1 significantly decreased phosphorylated S6 and Akt to half the level of the control rats in the IR-C, which suggests that both of the mechanistic target of rapamycin complex 1 and 2 (mTORC1 and mTORC2) were inhibited. The MMP2 level was increased suggesting that BBB disruption could be aggravated by Rapalink-1. Taken together, our data suggest that inhibiting both mTORC1 and mTORC2 by Rapalink-1 could worsen the neuronal damage in the early stage of cerebral ischemia–reperfusion and that the aggravation of BBB disruption could be one of the contributing factors.
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Affiliation(s)
- Oak Z Chi
- Department of Anesthesiology and Perioperative Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, United States
| | - Xia Liu
- Department of Anesthesiology and Perioperative Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, United States
| | - Sean Cofano
- Department of Anesthesiology and Perioperative Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ, United States
| | - Nikhil Patel
- Department of Neuroscience and Cell Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ, United States
| | - Estela Jacinto
- Department of Biochemistry and Molecular Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ, United States
| | - Harvey R Weiss
- Department of Neuroscience and Cell Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, NJ, United States
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