1
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Wang Z, Zhang X, Zhang G, Zheng YJ, Zhao A, Jiang X, Gan J. Astrocyte modulation in cerebral ischemia-reperfusion injury: A promising therapeutic strategy. Exp Neurol 2024; 378:114814. [PMID: 38762094 DOI: 10.1016/j.expneurol.2024.114814] [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: 01/25/2024] [Revised: 04/03/2024] [Accepted: 05/12/2024] [Indexed: 05/20/2024]
Abstract
Cerebral ischemia-reperfusion injury (CIRI) poses significant challenges for drug development due to its complex pathogenesis. Astrocyte involvement in CIRI pathogenesis has led to the development of novel astrocyte-targeting drug strategies. To comprehensively review the current literature, we conducted a thorough analysis from January 2012 to December 2023, identifying 82 drugs aimed at preventing and treating CIRI. These drugs target astrocytes to exert potential benefits in CIRI, and their primary actions include modulation of relevant signaling pathways to inhibit neuroinflammation and oxidative stress, reduce cerebral edema, restore blood-brain barrier integrity, suppress excitotoxicity, and regulate autophagy. Notably, active components from traditional Chinese medicines (TCM) such as Salvia miltiorrhiza, Ginkgo, and Ginseng exhibit these important pharmacological properties and show promise in the treatment of CIRI. This review highlights the potential of astrocyte-targeted drugs to ameliorate CIRI and categorizes them based on their mechanisms of action, underscoring their therapeutic potential in targeting astrocytes.
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Affiliation(s)
- Ziyu Wang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Xiaolu Zhang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Guangming Zhang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yu Jia Zheng
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Anliu Zhao
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Xijuan Jiang
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China.
| | - Jiali Gan
- School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, China.
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2
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Soares AR, Picciotto MR. Nicotinic regulation of microglia: potential contributions to addiction. J Neural Transm (Vienna) 2024; 131:425-435. [PMID: 37778006 PMCID: PMC11189589 DOI: 10.1007/s00702-023-02703-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 09/22/2023] [Indexed: 10/03/2023]
Abstract
Clinical and preclinical studies have identified immunosuppressive effects of nicotine, with potential implications for treating nicotine addiction. Here we review how nicotine can regulate microglia, the resident macrophages in the brain, and corresponding effects of nicotine on neuroimmune signaling. There is significant evidence that activation of α7 nicotinic acetylcholine receptors (nAChRs) on microglia can trigger an anti-inflammatory cascade that alters microglial polarization and activity, cytokine release, and intracellular calcium concentrations, leading to neuroprotection. These anti-inflammatory effects of nicotine-dependent α7 nAChR signaling are lost during withdrawal, suggesting that neuroimmune signaling is potentiated during abstinence, and thus, heightened microglial activity may drive circuit disruption that contributes to withdrawal symptoms and hyperkatifeia. In sum, the clinical literature has highlighted immunomodulatory effects of nicotine and the potential for anti-inflammatory compounds to treat addiction. The preclinical literature investigating the underlying mechanisms points to a role of microglial engagement in the circuit dysregulation and behavioral changes that occur during nicotine addiction and withdrawal, driven, at least in part, by activation of α7 nAChRs on microglia. Specifically targeting microglial signaling may help alleviate withdrawal symptoms in people with nicotine dependence and help to promote abstinence.
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Affiliation(s)
- Alexa R Soares
- Department of Psychiatry, Yale University, 34 Park Street-3rd floor Research, New Haven, CT, 06508, USA
- Interdepartmental Neuroscience Program, Yale University School of Medicine, New Haven, CT, 06508, USA
| | - Marina R Picciotto
- Department of Psychiatry, Yale University, 34 Park Street-3rd floor Research, New Haven, CT, 06508, USA.
- Interdepartmental Neuroscience Program, Yale University School of Medicine, New Haven, CT, 06508, USA.
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3
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Pan JZ, Wang Z, Sun W, Pan P, Li W, Sun Y, Chen S, Lin A, Tan W, He L, Greene J, Yao V, An L, Liang R, Li Q, Yu J, Zhang L, Kyritsis N, Fernandez XD, Moncivais S, Mendoza E, Fung P, Wang G, Niu X, Du Q, Xiao Z, Chang Y, Lv P, Huie JR, Torres‐Espin A, Ferguson AR, Hemmerle DD, Talbott JF, Weinstein PR, Pascual LU, Singh V, DiGiorgio AM, Saigal R, Whetstone WD, Manley GT, Dhall SS, Bresnahan JC, Maze M, Jiang X, Singhal NS, Beattie MS, Su H, Guan Z. ATF3 is a neuron-specific biomarker for spinal cord injury and ischaemic stroke. Clin Transl Med 2024; 14:e1650. [PMID: 38649772 PMCID: PMC11035380 DOI: 10.1002/ctm2.1650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 03/18/2024] [Accepted: 03/20/2024] [Indexed: 04/25/2024] Open
Abstract
BACKGROUND Although many molecules have been investigated as biomarkers for spinal cord injury (SCI) or ischemic stroke, none of them are specifically induced in central nervous system (CNS) neurons following injuries with low baseline expression. However, neuronal injury constitutes a major pathology associated with SCI or stroke and strongly correlates with neurological outcomes. Biomarkers characterized by low baseline expression and specific induction in neurons post-injury are likely to better correlate with injury severity and recovery, demonstrating higher sensitivity and specificity for CNS injuries compared to non-neuronal markers or pan-neuronal markers with constitutive expressions. METHODS In animal studies, young adult wildtype and global Atf3 knockout mice underwent unilateral cervical 5 (C5) SCI or permanent distal middle cerebral artery occlusion (pMCAO). Gene expression was assessed using RNA-sequencing and qRT-PCR, while protein expression was detected through immunostaining. Serum ATF3 levels in animal models and clinical human samples were measured using commercially available enzyme-linked immune-sorbent assay (ELISA) kits. RESULTS Activating transcription factor 3 (ATF3), a molecular marker for injured dorsal root ganglion sensory neurons in the peripheral nervous system, was not expressed in spinal cord or cortex of naïve mice but was induced specifically in neurons of the spinal cord or cortex within 1 day after SCI or ischemic stroke, respectively. Additionally, ATF3 protein levels in mouse blood significantly increased 1 day after SCI or ischemic stroke. Importantly, ATF3 protein levels in human serum were elevated in clinical patients within 24 hours after SCI or ischemic stroke. Moreover, Atf3 knockout mice, compared to the wildtype mice, exhibited worse neurological outcomes and larger damage regions after SCI or ischemic stroke, indicating that ATF3 has a neuroprotective function. CONCLUSIONS ATF3 is an easily measurable, neuron-specific biomarker for clinical SCI and ischemic stroke, with neuroprotective properties. HIGHLIGHTS ATF3 was induced specifically in neurons of the spinal cord or cortex within 1 day after SCI or ischemic stroke, respectively. Serum ATF3 protein levels are elevated in clinical patients within 24 hours after SCI or ischemic stroke. ATF3 exhibits neuroprotective properties, as evidenced by the worse neurological outcomes and larger damage regions observed in Atf3 knockout mice compared to wildtype mice following SCI or ischemic stroke.
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Affiliation(s)
- Jonathan Z. Pan
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Zhanqiang Wang
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of NeurologyCangzhou People's HospitalCangzhouChina
| | - Wei Sun
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyShandong Provincial Hospital, Shandong UniversityJinanChina
| | - Peipei Pan
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Wei Li
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyShandong Provincial Hospital, Shandong UniversityJinanChina
| | - Yongtao Sun
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyQianfoshan Hospital, Shandong UniversityJinanChina
| | - Shoulin Chen
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyThe Second Affiliated Hospital, Nanchang UniversityNanchangChina
| | - Amity Lin
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Wulin Tan
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyGuangzhou Medical UniversityGuangzhouChina
| | - Liangliang He
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of Pain ManagementXuanwu Hospital, Capital Medical UniversityBeijingChina
| | - Jacob Greene
- Medical SchoolUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Virginia Yao
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Lijun An
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyNo. 1 People's HospitalHuaianChina
| | - Rich Liang
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Qifeng Li
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of NeurosurgeryTianjin Medical University General HospitalTianjinChina
| | - Jessica Yu
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Lingyi Zhang
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Nikolaos Kyritsis
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Xuan Duong Fernandez
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Sara Moncivais
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Esmeralda Mendoza
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Pamela Fung
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Gongming Wang
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyShandong Provincial Hospital, Shandong UniversityJinanChina
| | - Xinhuan Niu
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyShandong Provincial Hospital, Shandong UniversityJinanChina
| | - Qihang Du
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyShandong Provincial Hospital, Shandong UniversityJinanChina
| | - Zhaoyang Xiao
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Department of AnesthesiologyThe Second Affiliated Hospital, Dalian Medical UniversityDalianChina
| | - Yuwen Chang
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Peiyuan Lv
- Department of AnesthesiologyThe Second Affiliated Hospital, Dalian Medical UniversityDalianChina
- Department of NeurologyHebei Medical UniversityShijiazhuangChina
| | - J. Russell Huie
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Abel Torres‐Espin
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Adam R. Ferguson
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Debra D. Hemmerle
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Jason F. Talbott
- Department of RadiologyUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Philip R. Weinstein
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Lisa U. Pascual
- Department of Orthopedic SurgeryOrthopaedic Trauma InstituteUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Vineeta Singh
- Department of NeurologyUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Anthony M. DiGiorgio
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Rajiv Saigal
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - William D. Whetstone
- Department of Emergency MedicineUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Geoffrey T. Manley
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Sanjay S. Dhall
- Department of NeurosurgeryHarbor UCLA Medical CenterTorranceCaliforniaUSA
| | - Jacqueline C. Bresnahan
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Mervyn Maze
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Xiangning Jiang
- Department of NeurologyUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Neel S. Singhal
- Department of NeurologyUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Michael S. Beattie
- Department of Neurological SurgeryUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Brain and Spinal Injury CenterUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Hua Su
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
- Center for Cerebrovascular ResearchUniversity of California San FranciscoSan FranciscoCaliforniaUSA
| | - Zhonghui Guan
- Department of Anesthesia and Perioperative CareUniversity of California San FranciscoSan FranciscoCaliforniaUSA
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4
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Ihnatovych I, Saddler RA, Sule N, Szigeti K. Translational implications of CHRFAM7A, an elusive human-restricted fusion gene. Mol Psychiatry 2024; 29:1020-1032. [PMID: 38200291 PMCID: PMC11176066 DOI: 10.1038/s41380-023-02389-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 12/08/2023] [Accepted: 12/15/2023] [Indexed: 01/12/2024]
Abstract
Genes restricted to humans may contribute to human-specific traits and provide a different context for diseases. CHRFAM7A is a uniquely human fusion gene and a negative regulator of the α7 nicotinic acetylcholine receptor (α7 nAChR). The α7 nAChR has been a promising target for diseases affecting cognition and higher cortical functions, however, the treatment effect observed in animal models failed to translate into human clinical trials. As CHRFAM7A was not accounted for in preclinical drug screens it may have contributed to the translational gap. Understanding the complex genetic architecture of the locus, deciphering the functional impact of CHRFAM7A on α7 nAChR neurobiology and utilizing human-relevant models may offer novel approaches to explore α7 nAChR as a drug target.
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Affiliation(s)
- Ivanna Ihnatovych
- Department of Neurology, State University of New York at Buffalo, 875 Ellicott St., Buffalo, NY, 14203, USA
| | - Ruth-Ann Saddler
- Department of Neurology, State University of New York at Buffalo, 875 Ellicott St., Buffalo, NY, 14203, USA
| | - Norbert Sule
- Roswell Park Comprehensive Cancer Center, 665 Elm St, Buffalo, NY, 14203, USA
| | - Kinga Szigeti
- Department of Neurology, State University of New York at Buffalo, 875 Ellicott St., Buffalo, NY, 14203, USA.
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5
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Jelinek M, Lipkova J, Duris K. Vagus nerve stimulation as immunomodulatory therapy for stroke: A comprehensive review. Exp Neurol 2024; 372:114628. [PMID: 38042360 DOI: 10.1016/j.expneurol.2023.114628] [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: 07/27/2023] [Revised: 10/20/2023] [Accepted: 11/27/2023] [Indexed: 12/04/2023]
Abstract
Stroke is a devastating cerebrovascular pathology with high morbidity and mortality. Inflammation plays a central role in the pathophysiology of stroke. Vagus nerve stimulation (VNS) is a promising immunomodulatory method that has shown positive effects in stroke treatment, including neuroprotection, anti-apoptosis, anti-inflammation, antioxidation, reduced infarct volume, improved neurological scores, and promotion of M2 microglial polarization. In this review, we summarize the current knowledge about the vagus nerve's immunomodulatory effects through the cholinergic anti-inflammatory pathway (CAP) and provide a comprehensive assessment of the available experimental literature focusing on the use of VNS in stroke treatment.
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Affiliation(s)
- Matyas Jelinek
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jolana Lipkova
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Kamil Duris
- Department of Pathophysiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; Department of Neurosurgery, The University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic.
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6
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Baig SS, Kamarova M, Bell SM, Ali AN, Su L, Dimairo M, Dawson J, Redgrave JN, Majid A. tVNS in Stroke: A Narrative Review on the Current State and the Future. Stroke 2023; 54:2676-2687. [PMID: 37646161 DOI: 10.1161/strokeaha.123.043414] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Ischemic stroke is a leading cause of disability and there is a paucity of therapeutic strategies that promote functional recovery after stroke. Transcutaneous vagus nerve stimulation (tVNS) has shown promising evidence as a tool to reduce infarct size in animal models of hyperacute stroke. In chronic stroke, tVNS paired with limb movements has been shown to enhance neurological recovery. In this review, we summarize the current evidence for tVNS in preclinical models and clinical trials in humans. We highlight the mechanistic pathways involved in the beneficial effects of tVNS. We critically evaluate the current gaps in knowledge and recommend the key areas of research required to translate tVNS into clinical practice in acute and chronic stroke.
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Affiliation(s)
- Sheharyar S Baig
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Marharyta Kamarova
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Simon M Bell
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Ali N Ali
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Li Su
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Munya Dimairo
- School of Health and Related Research, University of Sheffield, United Kingdom (M.D.)
| | - Jesse Dawson
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Queen Elizabeth University Hospital, United Kingdom (J.D.)
| | - Jessica N Redgrave
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
| | - Arshad Majid
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, United Kingdom (S.S.B., M.K., S.M.B., A.N.A., L.S., J.N.R., A.M.)
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7
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Aguado L, Joya A, Garbizu M, Plaza-García S, Iglesias L, Hernández MI, Ardaya M, Mocha N, Gómez-Vallejo V, Cossio U, Higuchi M, Rodríguez-Antigüedad A, Freijo MM, Domercq M, Matute C, Ramos-Cabrer P, Llop J, Martín A. Therapeutic effect of α7 nicotinic receptor activation after ischemic stroke in rats. J Cereb Blood Flow Metab 2023:271678X231161207. [PMID: 36916034 PMCID: PMC10369150 DOI: 10.1177/0271678x231161207] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Nicotinic acetylcholine α7 receptors (α7 nAChRs) have a well-known modulator effect in neuroinflammation. Yet, the therapeutical effect of α7 nAChRs activation after stroke has been scarcely evaluated to date. The role of α7 nAChRs activation with PHA 568487 on inflammation after brain ischemia was assessed with positron emission tomography (PET) using [18F]DPA-714 and [18F]BR-351 radiotracers after transient middle cerebral artery occlusion (MCAO) in rats. The assessment of brain oedema, blood brain barrier (BBB) disruption and neurofunctional progression after treatment was evaluated with T2 weighted and dynamic contrast-enhanced magnetic resonance imaging (T2 W and DCE-MRI) and neurological evaluation. The activation of α7 nAChRs resulted in a decrease of ischemic lesion, midline displacement and cell neurodegeneration from days 3 to 7 after ischemia. Besides, the treatment with PHA 568487 improved the neurofunctional outcome. Treated ischemic rats showed a significant [18F]DPA-714-PET uptake reduction at day 7 together with a decrease of activated microglia/infiltrated macrophages. Likewise, the activation of α7 receptors displayed an increase of [18F]BR-351-PET signal in ischemic cortical regions, which resulted from the overactivation of MMP-2. Finally, the treatment with PHA 568487 showed a protective effect on BBB disruption and blood brain vessel integrity after cerebral ischemia.
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Affiliation(s)
- Laura Aguado
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain
| | - Ana Joya
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain
| | | | - Sandra Plaza-García
- CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain
| | - Leyre Iglesias
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,Neurovascular Group, Biocruces Health Research Institute, Barakaldo, Spain
| | | | - María Ardaya
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,Donostia International Physics Center (DIPC), San Sebastian, Spain
| | - Naroa Mocha
- Achucarro Basque Center for Neuroscience, Leioa, Spain
| | | | - Unai Cossio
- CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain
| | - Makoto Higuchi
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | | | - Mari Mar Freijo
- Neurovascular Group, Biocruces Health Research Institute, Barakaldo, Spain.,Department of Neurology, Cruces University Hospital, Barakaldo, Spain
| | - María Domercq
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,Department of Neuroscience, University of Basque Country (UPV/EHU) and CIBERNED, Leioa, Spain
| | - Carlos Matute
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,Department of Neuroscience, University of Basque Country (UPV/EHU) and CIBERNED, Leioa, Spain
| | - Pedro Ramos-Cabrer
- CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain.,Ikerbasque Basque Foundation for Science, Bilbao, Spain
| | - Jordi Llop
- CIC biomaGUNE, Basque Research and Technology Alliance, San Sebastian, Spain.,Centro de Investigación Biomédica en Red - Enfermedades Respiratorias, CIBERES, Madrid, Spain
| | - Abraham Martín
- Achucarro Basque Center for Neuroscience, Leioa, Spain.,Ikerbasque Basque Foundation for Science, Bilbao, Spain
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8
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Niu XH, Liu RH, Lv X, He RL, Lv FZ, Wu SJ, Li XQ, Li L, Lin JF. Activating α7nAChR helps post-myocardial infarction healing by regulating macrophage polarization via the STAT3 signaling pathway. Inflamm Res 2023; 72:879-892. [PMID: 36912917 DOI: 10.1007/s00011-023-01714-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 12/11/2022] [Accepted: 02/22/2023] [Indexed: 03/14/2023] Open
Abstract
BACKGROUND Monocytes/macrophages play critical roles in inflammation and cardiac remodeling following myocardial infarction (MI). The cholinergic anti-inflammatory pathway (CAP) modulates local and systemic inflammatory responses by activating α7 nicotinic acetylcholine receptors (α7nAChR) in monocytes/macrophages. We investigated the effect of α7nAChR on MI-induced monocyte/macrophage recruitment and polarization and its contribution to cardiac remodeling and dysfunction. METHODS Adult male Sprague Dawley rats underwent coronary ligation and were intraperitoneally injected with the α7nAChR-selective agonist PNU282987 or the antagonist methyllycaconitine (MLA). RAW264.7 cells were stimulated with lipopolysaccharide (LPS) + interferon-gamma (IFN-γ) and treated with PNU282987, MLA, and S3I-201 (a STAT3 inhibitor). Cardiac function was evaluated by echocardiography. Masson's trichrome and immunofluorescence were used to detect cardiac fibrosis, myocardial capillary density, and M1/M2 macrophages. Western blotting was used to detect protein expression, and the proportion of monocytes was measured using flow cytometry. RESULTS Activating the CAP with PNU282987 significantly improved cardiac function and reduced cardiac fibrosis and 28-day mortality after MI. On days 3 and 7 post-MI, PNU282987 reduced the percentage of peripheral CD172a + CD43low monocytes and the infiltration of M1 macrophages in the infarcted hearts, whereas it increased the recruitment of peripheral CD172a + CD43high monocytes and M2 macrophages. Conversely, MLA exerted the opposite effects. In vitro, PNU282987 inhibited M1 macrophage polarization and promoted M2 macrophage polarization in LPS + IFN-γ-stimulated RAW264.7 cells. These PNU282987-induced changes in LPS + IFN-γ-stimulated RAW264.7 cells were reversed by administering S3I-201. CONCLUSION Activating α7nAChR inhibits the early recruitment of pro-inflammatory monocytes/macrophages during MI and improves cardiac function and remodeling. Our findings suggest a promising therapeutic target for regulating monocyte/macrophage phenotypes and promoting healing after MI.
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Affiliation(s)
- Xiao-Hui Niu
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China
| | - Rong-Hua Liu
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China
| | - Xiao Lv
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China
| | - Rui-Lin He
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China
| | - Fang-Zhou Lv
- Department of Ultrasonography, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Shu-Jie Wu
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China
| | - Xu-Qing Li
- Rehabilitation Medicine Center, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China
| | - Lei Li
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China.
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China.
| | - Jia-Feng Lin
- Department of Cardiology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325027, China.
- Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou, 325000, China.
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9
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Huo K, Xu J, Ma K, Wang J, Wei M, Zhang M, Guo Q, Qu Q. Loganin attenuates neuroinflammation after ischemic stroke and fracture by regulating α7nAChR-mediated microglial polarization. ENVIRONMENTAL TOXICOLOGY 2023; 38:926-940. [PMID: 36637150 DOI: 10.1002/tox.23738] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Fracture in acute stage of ischemic stroke can increase inflammatory response and enhance stroke injury. Loganin alleviates the symptoms of many inflammatory diseases through its anti-inflammatory effect, but its role in ischemic stroke and fracture remains to be explored. Here, mice were handled with permanent middle cerebral artery occlusion (pMCAO) followed by tibial fracture 1 day later to establish a pMCAO+fracture model. Loganin or Methyllycaconitine (MLA, a specific a7nAchR inhibitor) were intragastrically administered 2 or 0.5 h before pMCAO, respectively. And mouse motor function and infarct volume were evaluated 3 days after pMCAO. We found that loganin alleviated the neurological deficit, cerebral infarction volume, and neuronal apoptosis (NeuN+ TUNEL+ ) in mice with pMCAO+fracture. And loganin suppressed pMCAO+fracture-induced neuroinflammation by promoting M2 microglia polarization (Iba1+ CD206+ ) and inhibiting M1 microglia polarization (Iba1+ CD11b+ ). While administration with MLA reversed the protective effect of loganin on pMCAO+fracture-induced neurological deficit and neuroinflammation. Next, LPS was used to stimulate BV2 microglia to simulate pMCAO+fracture-induced inflammatory microenvironment in vitro. Loganin facilitated the transformation of LPS-stimulated BV2 cells from M1 pro-inflammatory state (CD11b+ ) to M2 anti-inflammatory state (CD206+ ), which was antagonized by treatment with MLA. And loganin induced autophagy activation in LPS-stimulated BV2 cells by activating a7nAchR. Moreover, treatment with rapamycin (an autophagy activator) neutralized the inhibitory effect of MLA on loganin induced transformation of BV2 cells to M2 phenotype. Furthermore, BV2 cells were treated with LPS, LPS + loganin, LPS + loganin+MLA, or LPS + loganin+MLA+ rapamycin to obtain conditioned medium (CM) for stimulating primary neurons. Loganin reduced the damage of primary neurons caused by LPS-stimulated BV2 microglia through activating a7nAchR and inducing autophagy activation. In conclusion, loganin played anti-inflammatory and neuroprotective roles in pMCAO + fracture mice by activating a7nAchR, enhancing autophagy and promoting M2 polarization of microglia.
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Affiliation(s)
- Kang Huo
- Department of Neurology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
- Center of brain health, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Jing Xu
- Department of Emergency, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Kaige Ma
- Department of Neurobiology, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi Province, People's Republic of China
| | - Jianyi Wang
- Department of Neurology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Meng Wei
- Department of Neurology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Meng Zhang
- Department of Neurology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Qinyue Guo
- Department of Critical Care Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
| | - Qiumin Qu
- Department of Neurology, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi Province, People's Republic of China
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10
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Wang YY, Lin SY, Chang CY, Wu CC, Chen WY, Huang WC, Liao SL, Wang WY, Chen CJ. α7 nicotinic acetylcholine receptor agonist improved brain injury and impaired glucose metabolism in a rat model of ischemic stroke. Metab Brain Dis 2023; 38:1249-1259. [PMID: 36662413 DOI: 10.1007/s11011-023-01167-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 01/13/2023] [Indexed: 01/21/2023]
Abstract
Vagus nerve stimulation through the action of acetylcholine can modulate inflammatory responses and metabolism. α7 Nicotinic Acetylcholine Receptor (α7nAChR) is a key component in the biological functions of acetylcholine. To further explore the health benefits of vagus nerve stimulation, this study aimed to investigate whether α7nAChR agonists offer beneficial effects against poststroke inflammatory and metabolic changes and to identify the underlying mechanisms in a rat model of stroke established by permanent cerebral ischemia. We found evidence showing that pretreatment with α7nAChR agonist, GTS-21, improved poststroke brain infarction size, impaired motor coordination, brain apoptotic caspase 3 activation, dysregulated glucose metabolism, and glutathione reduction. In ischemic cortical tissues and gastrocnemius muscles with GTS-21 pretreatment, macrophages/microglia M1 polarization-associated Tumor Necrosis Factor-α (TNF-α) mRNA, Cluster of Differentiation 68 (CD68) protein, and Inducible Nitric Oxide Synthase (iNOS) protein expression were reduced, while expression of anti-inflammatory cytokine IL-4 mRNA, and levels of M2 polarization-associated CD163 mRNA and protein were increased. In the gastrocnemius muscles, stroke rats showed a reduction in both glutathione content and Akt Serine 473 phosphorylation, as well as an elevation in Insulin Receptor Substrate-1 Serine 307 phosphorylation and Dynamin-Related Protein 1 Serine 616 phosphorylation. GTS-21 reversed poststroke changes in the gastrocnemius muscles. Overall, our findings, provide further evidence supporting the neuroprotective benefits of α7nAChR agonists, and indicate that they may potentially exert anti-inflammatory and metabolic effects peripherally in the skeletal muscle in an acute ischemic stroke animal model.
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Affiliation(s)
- Ya-Yu Wang
- Department of Family Medicine, Taichung Veterans General Hospital, 407, Taichung City, Taiwan
| | - Shih-Yi Lin
- Center for Geriatrics and Gerontology, Taichung Veterans General Hospital, 407, Taichung City, Taiwan
- Institute of Clinical Medicine, National Yang Ming Chiao Tung University, 112, Taipei City, Taiwan
| | - Cheng-Yi Chang
- Department of Surgery, Feng Yuan Hospital, 420, Taichung City, Taiwan
- Department of Veterinary Medicine, National Chung Hsing University, 402, Taichung City, Taiwan
| | - Chih-Cheng Wu
- Department of Anesthesiology, Taichung Veterans General Hospital, 407, Taichung City, Taiwan
| | - Wen-Ying Chen
- Department of Veterinary Medicine, National Chung Hsing University, 402, Taichung City, Taiwan
| | - Wei-Chi Huang
- Department of Veterinary Medicine, National Chung Hsing University, 402, Taichung City, Taiwan
| | - Su-Lan Liao
- Department of Medical Research, Taichung Veterans General Hospital, No. 1650, Sec. 4, Taiwan Boulevard, 407, Taichung City, Taiwan
| | - Wen-Yi Wang
- Department of Nursing, Hung Kuang University, 433, Taichung City, Taiwan
| | - Chun-Jung Chen
- Department of Medical Research, Taichung Veterans General Hospital, No. 1650, Sec. 4, Taiwan Boulevard, 407, Taichung City, Taiwan.
- Department of Medical Laboratory Science and Biotechnology, China Medical University, 404, Taichung City, Taiwan.
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11
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Xin Y, Tian M, Deng S, Li J, Yang M, Gao J, Pei X, Wang Y, Tan J, Zhao F, Gao Y, Gong Y. The Key Drivers of Brain Injury by Systemic Inflammatory Responses after Sepsis: Microglia and Neuroinflammation. Mol Neurobiol 2023; 60:1369-1390. [PMID: 36445634 PMCID: PMC9899199 DOI: 10.1007/s12035-022-03148-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 11/21/2022] [Indexed: 12/03/2022]
Abstract
Sepsis is a leading cause of intensive care unit admission and death worldwide. Most surviving patients show acute or chronic mental disorders, which are known as sepsis-associated encephalopathy (SAE). Although accumulating studies in the past two decades focused on the pathogenesis of SAE, a systematic review of retrospective studies which exclusively focuses on the inflammatory mechanisms of SAE has been lacking yet. This review summarizes the recent advance in the field of neuroinflammation and sheds light on the activation of microglia in SAE. Activation of microglia predominates neuroinflammation. As the gene expression profile changes, microglia show heterogeneous characterizations throughout all stages of SAE. Here, we summarize the systemic inflammation following sepsis and also the relationship of microglial diversity and neuroinflammation. Moreover, a collection of neuroinflammation-related dysfunction has also been reviewed to illustrate the possible mechanisms for SAE. In addition, promising pharmacological or non-pharmacological therapeutic strategies, especially those which target neuroinflammation or microglia, are also concluded in the final part of this review. Collectively, clarification of the vital relationship between neuroinflammation and SAE-related mental disorders would significantly improve our understanding of the pathophysiological mechanisms in SAE and therefore provide potential targets for therapies of SAE aimed at inhibiting neuroinflammation.
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Affiliation(s)
- Yuewen Xin
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Mi Tian
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Shuixiang Deng
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jiaying Li
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Miaoxian Yang
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jianpeng Gao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Xu Pei
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Yao Wang
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Jiaying Tan
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Feng Zhao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China
| | - Yanqin Gao
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Ye Gong
- Department of Critical Care Medicine of Huashan Hospital, State Key Laboratory of Medical Neurobiology, MOE Frontiers Center for Brain Science and Institutes of Brain Science, Fudan University, Shanghai, China.
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12
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Chen S, Sun Y, Li F, Zhang X, Hu X, Zhao X, Li Y, Li H, Zhang J, Liu W, Zheng GQ, Jin X. Modulation of α7nAchR by Melatonin Alleviates Ischemia and Reperfusion-Compromised Integrity of Blood-Brain Barrier Through Inhibiting HMGB1-Mediated Microglia Activation and CRTC1-Mediated Neuronal Loss. Cell Mol Neurobiol 2022; 42:2407-2422. [PMID: 34196879 DOI: 10.1007/s10571-021-01122-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 06/22/2021] [Indexed: 10/21/2022]
Abstract
The only food and drug administration (FDA)-approved drug currently available for the treatment of acute ischemic stroke is tissue plasminogen activator (tPA), yet the therapeutic benefits of this drug are partially outweighed by the increased risk of hemorrhagic transformation (HT). Analysis of the NIH trial has shown that cigarette smoking protected tPA-treated patients from HT; however, the underlying mechanism is not clear. Nicotinic acetylcholine receptors (nAChR) has shown anti-inflammatory effect and modulation nAChR could be a strategy to reduce ischemia/reperfusion-induced blood-brain barrier (BBB) damage. Since melatonin could regulate the expression of α7nAchR and melatonin's neuroprotective effect against ischemic injury is mediated via α7nAChR modulation, here, we aim to test the hypothesis that melatonin reduces ischemia and reperfusion (I/R)-induced BBB damage through modulation of α7nACh receptor (α7nAChR). Mice were subjected to 1.5 h ischemia and 24 h reperfusion and at the onset of reperfusion, mice received intraperitoneal administration (i.p.) of either drug or saline. Mice were randomly assigned into five groups: Saline; α7nAChR agonist PNU282987; Melatonin; Melatonin+Methyllycaconitine (MLA, α7nAChR antagonist), and MLA group. BBB permeability was assessed by detecting the extravasation of Evan's blue and IgG. Our results showed that I/R significantly increased BBB permeability accompanied by occludin degradation, microglia activation, and high mobility group box 1 (HMGB1) release from the neuron. In addition, I/R significantly induced neuronal loss accompanied by the decrease of CREB-regulated transcriptional coactivator 1 (CRTC1) and p-CREB expression. Melatonin treatment significantly inhibited the above changes through modulating α7nAChR. Taken together, these results demonstrate that melatonin provides a protective effect on ischemia/reperfusion-induced BBB damage, at least in part, depending on the modulation of α7nAChR.
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Affiliation(s)
- Shuang Chen
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, China
| | - Yanyun Sun
- Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China
| | - Fei Li
- Hubei Key Laboratory of Wudang Local Chinese Medicine Research, School of Pharmaceutical Sciences, Hubei University of Medicine, Shiyan, 442000, China
| | - Xinyu Zhang
- Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China
| | - Xiaoyan Hu
- Department of Anatomy, Histology and Embrology, School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100069, China
| | - Xiaoyun Zhao
- Department of Anatomy, Histology and Embrology, School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100069, China
| | - Yixuan Li
- Department of Anatomy, Histology and Embrology, School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100069, China
| | - Hui Li
- Department of Anatomy, Histology and Embrology, School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100069, China
| | - Jianliang Zhang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100054, China
| | - Wenlan Liu
- The Central Laboratory, Shenzhen Second People's Hospital, Shenzhen University 1st Affiliated Hospital, Shenzhen University School of Medicine, Shenzhen, 518035, China
| | - Guo-Qing Zheng
- Department of Neurology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, 325000, China.
| | - Xinchun Jin
- Institute of Neuroscience, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China.
- Department of Anatomy, Histology and Embrology, School of Basic Medical Sciences, Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, 100069, China.
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13
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DiBrog AM, Kern KA, Mukherjee A, Przybysz JT, Mietlicki-Baase EG. The alpha-7 nicotinic acetylcholine receptor agonist GTS-21 does not affect food intake in rats. Pharmacol Biochem Behav 2022; 219:173444. [PMID: 35944617 PMCID: PMC10577676 DOI: 10.1016/j.pbb.2022.173444] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 08/02/2022] [Accepted: 08/03/2022] [Indexed: 10/16/2022]
Abstract
Obesity is a prevalent disease, but effective treatments remain limited. Agonists of the alpha-7 nicotinic acetylcholine receptor (α7nAChR) promote negative energy balance in mice, but these effects are not well-studied in rats. We tested the hypothesis that the α7nAChR agonist GTS-21 would decrease food intake and body weight in adult male Sprague Dawley rats. Contrary to our hypothesis, acute systemic administration of GTS-21 produced no significant effects on chow or high-fat diet (HFD) intake. Acute intracerebroventricular (ICV) GTS-21 also had no impact on chow intake, and actually increased body weight at the highest dose tested. Previous studies suggest that GTS-21 engages the food intake-suppressive glucagon-like peptide-1 (GLP-1) system in mice. As there are known species differences in GLP-1 physiology between mice and rats, we tested the ability of GTS-21 to elicit GLP-1 secretion in rats. Our results showed that plasma levels of total GLP-1 in rats were not significantly altered by peripheral GTS-21 injection. These results represent an advance in understanding how α7nAChR activation impacts energy balance control in rodents and suggest that there may be important differences between rats and mice in the ability of GTS-21/α7nAChR activation to increase secretion of GLP-1.
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Affiliation(s)
- Adrianne M DiBrog
- Exercise and Nutrition Sciences, University at Buffalo, United States of America
| | - Katherine A Kern
- Exercise and Nutrition Sciences, University at Buffalo, United States of America
| | | | - Johnathan T Przybysz
- Exercise and Nutrition Sciences, University at Buffalo, United States of America
| | - Elizabeth G Mietlicki-Baase
- Exercise and Nutrition Sciences, University at Buffalo, United States of America; Center for Ingestive Behavior Research, University at Buffalo, United States of America.
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14
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The Alpha 7 Nicotinic Acetylcholine Receptor Does Not Affect Neonatal Brain Injury. Biomedicines 2022; 10:biomedicines10082023. [PMID: 36009570 PMCID: PMC9405910 DOI: 10.3390/biomedicines10082023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/11/2022] [Accepted: 08/15/2022] [Indexed: 11/16/2022] Open
Abstract
Inflammation plays a central role in the development of neonatal brain injury. The alpha 7 nicotinic acetylcholine receptor (α7nAChR) can modulate inflammation and has shown promising results as a treatment target in rodent models of adult brain injury. However, little is known about the role of the α7nAChR in neonatal brain injury. Hypoxic-ischemic (HI) brain injury was induced in male and female C57BL/6 mice, α7nAChR knock-out (KO) mice and their littermate controls on postnatal day (PND) 9–10. C57BL/6 pups received i.p. injections of α7nAChR agonist PHA 568487 (8 mg/kg) or saline once daily, with the first dose given directly after HI. Caspase-3 activity and cytokine mRNA expression in the brain was analyzed 24 h after HI. Motor function was assessed 24 and 48 h after HI, and immunohistochemistry was used to assess tissue loss at 24 h and 7 days after HI and microglial activation 7 days after HI. Activation of α7nAChR with the agonist PHA 568487 significantly decreased CCL2/MCP-1, CCL5/RANTES and IL-6 gene expression in the injured brain hemisphere 24 h after HI compared with saline controls in male, but not female, pups. However, α7nAChR activation did not alter caspase-3 activity and TNFα, IL-1β and CD68 mRNA expression. Furthermore, agonist treatment did not affect motor function (24 or 48 h), neuronal tissue loss (24 h or 7 days) or microglia activation (7 days) after HI in either sex. Knock-out of α7nAChR did not influence neuronal tissue loss 7 days after HI. In conclusion, targeting the α7nAChR in neonatal brain injury shows some effect on dampening acute inflammatory responses in male pups. However, this does not lead to an effect on overall injury outcome.
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15
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Preventive effects of a standardized flavonoid extract of safflower in rotenone-induced Parkinson's disease rat model. Neuropharmacology 2022; 217:109209. [DOI: 10.1016/j.neuropharm.2022.109209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 07/22/2022] [Accepted: 07/29/2022] [Indexed: 11/24/2022]
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16
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Associations of plasma carnitine, lysine, trimethyllysine and glycine with incident ischemic stroke: Findings from a nested case-control study. Clin Nutr 2022; 41:1889-1895. [DOI: 10.1016/j.clnu.2022.07.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 06/24/2022] [Accepted: 07/06/2022] [Indexed: 02/06/2023]
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17
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Bourhy L, Mazeraud A, Bozza FA, Turc G, Lledo PM, Sharshar T. Neuro-Inflammatory Response and Brain-Peripheral Crosstalk in Sepsis and Stroke. Front Immunol 2022; 13:834649. [PMID: 35464410 PMCID: PMC9022190 DOI: 10.3389/fimmu.2022.834649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/07/2022] [Indexed: 12/18/2022] Open
Abstract
Despite recent therapeutic advances, ischemic stroke is still a leading cause of death and disability. There is renewed attention on peripheral inflammatory signaling as a way of modulating the post-ischemic neuro-inflammatory process. The immune-brain crosstalk has long been the focus for understanding the mechanisms of sickness behavior, which is an adaptive autonomic, neuroendocrine, and behavioral response to a peripheral inflammation. It is mediated by humoral and neural pathways that mainly involve the circumventricular organs and vagal nerve, respectively. In this review we address the question of how sepsis and stroke can dysregulate this adaptive response, notably by impairing the central integration of peripheral signaling, but also by efferent control of the immune response. We highlight the potential role of gut–brain and brain–spleen signaling in stroke.
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Affiliation(s)
- Lena Bourhy
- Institut Pasteur, Université de Paris, Centre National de Recherche Scientifique, Unité Mixte de Recherche (CNRS UMR) 3571, Perception and Memory Unit, Paris, France
| | - Aurélien Mazeraud
- Institut Pasteur, Université de Paris, Centre National de Recherche Scientifique, Unité Mixte de Recherche (CNRS UMR) 3571, Perception and Memory Unit, Paris, France.,Neuro-Anesthesiology and Intensive Care Medicine, Groupe Hospitalier Universitaire (GHU) Paris Psychiatrie et Neurosciences, Université de Paris, Paris, France
| | - Fernando A Bozza
- National Institute of Infectious Disease Evandro Chagas (INI), Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil.,D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil
| | - Guillaume Turc
- Department of Neurology, GHU Paris Psychiatrie et Neurosciences, Université de Paris, Paris, France
| | - Pierre-Marie Lledo
- Institut Pasteur, Université de Paris, Centre National de Recherche Scientifique, Unité Mixte de Recherche (CNRS UMR) 3571, Perception and Memory Unit, Paris, France
| | - Tarek Sharshar
- Neuro-Anesthesiology and Intensive Care Medicine, Groupe Hospitalier Universitaire (GHU) Paris Psychiatrie et Neurosciences, Université de Paris, Paris, France
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18
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Jin X, Li P, Michalski D, Li S, Zhang Y, Jolkkonen J, Cui L, Didwischus N, Xuan W, Boltze J. Perioperative stroke: A perspective on challenges and opportunities for experimental treatment and diagnostic strategies. CNS Neurosci Ther 2022; 28:497-509. [PMID: 35224865 PMCID: PMC8928912 DOI: 10.1111/cns.13816] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 01/31/2022] [Accepted: 02/04/2022] [Indexed: 02/06/2023] Open
Abstract
Perioperative stroke is an ischemic or hemorrhagic cerebral event during or up to 30 days after surgery. It is a feared condition due to a relatively high incidence, difficulties in timely detection, and unfavorable outcome compared to spontaneously occurring stroke. Recent preclinical data suggest that specific pathophysiological mechanisms such as aggravated neuroinflammation contribute to the detrimental impact of perioperative stroke. Conventional treatment options are limited in the perioperative setting due to difficult diagnosis and medications affecting coagulation in may cases. On the contrary, the chance to anticipate cerebrovascular events at the time of surgery may pave the way for prevention strategies. This review provides an overview on perioperative stroke incidence, related problems, and underlying pathophysiological mechanisms. Based on this analysis, we assess experimental stroke treatments including neuroprotective approaches, cell therapies, and conditioning medicine strategies regarding their potential use in perioperative stroke. Interestingly, the specific aspects of perioperative stroke might enable a more effective application of experimental treatment strategies such as classical neuroprotection whereas others including cell therapies may be of limited use. We also discuss experimental diagnostic options for perioperative stroke augmenting classical clinical and imaging stroke diagnosis. While some experimental stroke treatments may have specific advantages in perioperative stroke, the paucity of established guidelines or multicenter clinical research initiatives currently limits their thorough investigation.
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Affiliation(s)
- Xia Jin
- Department of Anesthesiology, Renji Hospital, School of Medicine Shanghai Jiaotong University, Shanghai, China
| | - Peiying Li
- Department of Anesthesiology, Renji Hospital, School of Medicine Shanghai Jiaotong University, Shanghai, China
| | | | - Shen Li
- Department of Neurology and Psychiatry, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Yueman Zhang
- Department of Anesthesiology, Renji Hospital, School of Medicine Shanghai Jiaotong University, Shanghai, China
| | - Jukka Jolkkonen
- Department of Neurology and A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Lili Cui
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Nadine Didwischus
- School of Life Sciences, University of Warwick, Coventry, UK.,Department of Radiology, University of Pittsburgh, Pittsburgh, USA.,McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, USA
| | - Wei Xuan
- Department of Anesthesiology, Renji Hospital, School of Medicine Shanghai Jiaotong University, Shanghai, China
| | - Johannes Boltze
- School of Life Sciences, University of Warwick, Coventry, UK
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19
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Miclau TA, Torres-Espín A, Morshed S, Morioka K, Huie JR, El Naga A, Chou A, Pascual L, Duong Fernandez X, Kuo YH, Weinstein P, Dhall S, Bresnahan JC, Beattie MS, DiGiorgio AM, Ferguson AR. Appendicular fracture and polytrauma correlate with outcome of spinal cord injury (SCI): A TRACK-SCI study. J Neurotrauma 2022; 39:1030-1038. [PMID: 35255740 PMCID: PMC9536347 DOI: 10.1089/neu.2021.0375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Spinal cord injuries (SCIs) frequently occur in combination with other major organ injuries, such as traumatic brain injury (TBI) and injuries to the chest, abdomen, and musculoskeletal system (e.g., extremity, pelvic, and spine fractures). However, the effects of appendicular fractures on SCI recovery are poorly understood. We investigated whether the presence of SCI-concurrent appendicular fractures is predictive of a less robust SCI recovery. Patients enrolled in the Transforming Research And Clinical Knowledge in SCI (TRACK-SCI) prospective cohort study were identified and included in this secondary analysis study. Inclusion criteria resulted in 147 patients consisting of 120 isolated SCIs and 27 with concomitant appendicular fracture. The primary outcome was ASIA Impairment Scale (AIS) neurological grades at hospital discharge. Secondary outcomes included hospital length of stay, ICU length of stay, and AIS grade improvement during hospitalization. Multivariable binomial logistic regression analyses assessed whether SCI-concomitant appendicular fractures associate with SCI function and secondary outcomes. These analyses were adjusted for age, gender, injury severity, and non-fracture polytrauma. Appendicular fractures were associated with more severe AIS grades at hospital discharge, though covariate adjustments diminished statistical significance of this effect. Notably, non-fracture injuries to the chest and abdomen were influential covariates. Secondary analyses suggested that appendicular fractures also increased hospital length of stay. Our study indicated that SCI-associated polytrauma is important for predicting SCI functional outcomes. Further statistical evaluation is required to disentangle the effects of appendicular fractures, non-fracture solid organ injury, and SCI physiology to improve health outcomes amongst SCI patients.
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Affiliation(s)
- Theodore Andrew Miclau
- UCSF School of Medicine, 533 Parnassus Ave, San Francisco, California, United States, 94143;
| | - Abel Torres-Espín
- Universitat Autonoma de Barcelona, Cell Biology, Physiology and Immunology, and Institute of Neuroscience, Campus UAB, Campus UAB, Bellaterra, Barcelona, Spain, 082193;
| | - Saam Morshed
- University of California San Francisco, 8785, Orthopaedic Surgery, San Francisco, California, United States;
| | - Kazuhito Morioka
- University of California San Francisco, 8785, Orthopaedic Surgery, 2550 23rd Street, Bldg. 9, 3rd Floor, Room 346, San Francisco, California, United States, 941110.,University of California San Francisco, 8785, Neurological SUrgery, 1001 Potrero Ave, Bldg 1, Rm 101, San Francisco, California, United States, 94143;
| | - J Russell Huie
- University of California San Francisco, Brain and Spinal Injury Center, Dept. of Neurological Surgery, 1001 Potrero Ave, San Francisco, California, United States, 94110.,United States;
| | - Ashraf El Naga
- University of California San Francisco, 8785, Orthopaedic Surgery, San Francisco, California, United States;
| | - Austin Chou
- University of California, San Francisco, 1001 Potrero Ave, Building 1, San Francisco, California, United States, 94110;
| | - Lisa Pascual
- University of California San Francisco, 8785, Orthopedic Surgery, 2550 23rd Street, Bldg. 9, 2nd Floor, San Francisco, California, United States, 94110;
| | - Xuan Duong Fernandez
- University of California San Francisco, 8785, Neurological Surgery, San Francisco, California, United States;
| | - Yu-Hung Kuo
- UCSF Fresno, 589388, Department of Neurological Surgery, Fresno, California, United States;
| | - Philip Weinstein
- University of California San Francisco, 8785, Neurological Surgery, San Francisco, California, United States;
| | - Sanjay Dhall
- University of California San Francisco, Neurological Surgery, San Francisco, California, United States;
| | - Jacqueline C Bresnahan
- UCSF, Neurological Surgery, 1001 Potrero Ave, San Francisco, California, United States, 94110;
| | - Michael S Beattie
- UCSF, BASIC, 1001 Potrero Ave, San Francisco, California, United States, 94110;
| | - Anthony Michael DiGiorgio
- University of California San Francisco, 8785, Neurological Surgery, 505 Parnassus Ave, San Francisco, San Francisco, California, United States, 94143;
| | - Adam R Ferguson
- UCSF, Brain and Spinal Injury Center, Dept Neurosurgery, 1001 Potrero Ave, 1001 Potrero Ave, San Francisco, California, United States, 94110;
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20
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Seyedaghamiri F, Mahmoudi J, Hosseini L, Sadigh-Eteghad S, Farhoudi M. Possible Engagement of Nicotinic Acetylcholine Receptors in Pathophysiology of Brain Ischemia-Induced Cognitive Impairment. J Mol Neurosci 2021; 72:642-652. [PMID: 34596872 DOI: 10.1007/s12031-021-01917-4] [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: 06/30/2021] [Accepted: 09/12/2021] [Indexed: 10/20/2022]
Abstract
Post-stroke disabilities like cognitive impairment impose are complex conditions with great economic burdens on health care systems. For these comorbidities, no effective therapies have been identified yet. Nicotinic acetylcholine receptors (nAChRs) are multifunctional receptors participating in various behavioral and neurobiological functions. During brain ischemia, the increased glutamate accumulation leads to neuronal excitotoxicity as well as mitochondrial dysfunction. These abnormalities then cause the increased levels of oxidants, which play key roles in neuronal death and apoptosis in the infarct zone. Additionally, recall of cytokines and inflammatory factors play a prominent role in the exacerbation of ischemic injury. As well, neurotrophic factors' insufficiency results in synaptic dysfunction and cognitive impairments in ischemic brain. Of note, nAChRs through various signaling pathways can participate in therapeutic approaches such as cholinergic system's stimulation, and reduction of excitotoxicity, inflammation, apoptosis, oxidative stress, mitochondrial dysfunction, and autophagy. Moreover, the possible roles of nAChRs in neurogenesis, synaptogenesis, and stimulation of neurotrophic factors expression have been reported previously. On the other hand, the majority of the above-mentioned mechanisms were found to be common in both brain ischemia pathogenesis and cognitive function tuning. Therefore, it seems that nAChRs might be known as key regulators in the control of ischemia pathology, and their modulation could be considered as a new avenue in the multi-target treatment of post-stroke cognitive impairment.
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Affiliation(s)
| | - Javad Mahmoudi
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Leila Hosseini
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Saeed Sadigh-Eteghad
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Mehdi Farhoudi
- Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
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21
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Huo K, Wei M, Zhang M, Wang Z, Pan P, Shaligram SS, Huang J, Prado LBD, Wong J, Su H. Reduction of neuroinflammation alleviated mouse post bone fracture and stroke memory dysfunction. J Cereb Blood Flow Metab 2021; 41:2162-2173. [PMID: 33641516 PMCID: PMC8393305 DOI: 10.1177/0271678x21996177] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Tibia fracture (BF) enhances stroke injury and post-stroke memory dysfunction in mouse. Reduction of neuroinflammation by activation of α-7 nicotinic acetylcholine receptor (α-7 nAchR) reduced acute neuronal injury and sensorimotor dysfunction in mice with BF 1-day after stroke. We hypothesize that reduction of neuroinflammation by activation of α-7 nAchR improves long-term memory function of mice with BF 6-h before stroke. The mice were randomly assigned to saline, PHA-568487 (α-7 nAchR agonist) and methyllycaconitine (antagonist) treatment groups. The sensorimotor function was tested by adhesive removal and corner tests at 3 days, the memory function was tested by Y-maze test weekly for 8 weeks and novel objective recognition test at 8 weeks post-injuries. We found PHA-568487 treatment reduced, methyllycaconitine increased the number of CD68+ cells in the peri-infarct and hippocampal regions, neuronal injury in the infarct region, sensorimotor and long-term memory dysfunctions. PHA-568487 treatment also reduced, while methyllycaconitine treatment increased atrophy of hippocampal granule cell layer and white matter damage in the striatum. In addition, PHA-568487 treatment increased neuron proliferation in granule cell layer. Our data indicated that reduction of neuroinflammation through activation of α-7 nAchR decreased neuronal damage, sensorimotor and long-term memory dysfunction of mice with BF shortly before stroke.
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Affiliation(s)
- Kang Huo
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Meng Wei
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Meng Zhang
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Zhanqiang Wang
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Peipei Pan
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Sonali S Shaligram
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Jinhao Huang
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Leandro B Do Prado
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Julia Wong
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Hua Su
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
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22
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Molecular Mechanisms of Neuroimmune Crosstalk in the Pathogenesis of Stroke. Int J Mol Sci 2021; 22:ijms22179486. [PMID: 34502395 PMCID: PMC8431165 DOI: 10.3390/ijms22179486] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/26/2021] [Accepted: 08/28/2021] [Indexed: 12/21/2022] Open
Abstract
Stroke disrupts the homeostatic balance within the brain and is associated with a significant accumulation of necrotic cellular debris, fluid, and peripheral immune cells in the central nervous system (CNS). Additionally, cells, antigens, and other factors exit the brain into the periphery via damaged blood–brain barrier cells, glymphatic transport mechanisms, and lymphatic vessels, which dramatically influence the systemic immune response and lead to complex neuroimmune communication. As a result, the immunological response after stroke is a highly dynamic event that involves communication between multiple organ systems and cell types, with significant consequences on not only the initial stroke tissue injury but long-term recovery in the CNS. In this review, we discuss the complex immunological and physiological interactions that occur after stroke with a focus on how the peripheral immune system and CNS communicate to regulate post-stroke brain homeostasis. First, we discuss the post-stroke immune cascade across different contexts as well as homeostatic regulation within the brain. Then, we focus on the lymphatic vessels surrounding the brain and their ability to coordinate both immune response and fluid homeostasis within the brain after stroke. Finally, we discuss how therapeutic manipulation of peripheral systems may provide new mechanisms to treat stroke injury.
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23
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Chen R, Zhang X, Gu L, Zhu H, Zhong Y, Ye Y, Xiong X, Jian Z. New Insight Into Neutrophils: A Potential Therapeutic Target for Cerebral Ischemia. Front Immunol 2021; 12:692061. [PMID: 34335600 PMCID: PMC8317226 DOI: 10.3389/fimmu.2021.692061] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 06/16/2021] [Indexed: 12/25/2022] Open
Abstract
Ischemic stroke is one of the main issues threatening human health worldwide, and it is also the main cause of permanent disability in adults. Energy consumption and hypoxia after ischemic stroke leads to the death of nerve cells, activate resident glial cells, and promote the infiltration of peripheral immune cells into the brain, resulting in various immune-mediated effects and even contradictory effects. Immune cell infiltration can mediate neuronal apoptosis and aggravate ischemic injury, but it can also promote neuronal repair, differentiation and regeneration. The central nervous system (CNS), which is one of the most important immune privileged parts of the human body, is separated from the peripheral immune system by the blood-brain barrier (BBB). Under physiological conditions, the infiltration of peripheral immune cells into the CNS is controlled by the BBB and regulated by the interaction between immune cells and vascular endothelial cells. As the immune response plays a key role in regulating the development of ischemic injury, neutrophils have been proven to be involved in many inflammatory diseases, especially acute ischemic stroke (AIS). However, neutrophils may play a dual role in the CNS. Neutrophils are the first group of immune cells to enter the brain from the periphery after ischemic stroke, and their exact role in cerebral ischemia remains to be further explored. Elucidating the characteristics of immune cells and their role in the regulation of the inflammatory response may lead to the identification of new potential therapeutic strategies. Thus, this review will specifically discuss the role of neutrophils in ischemic stroke from production to functional differentiation, emphasizing promising targeted interventions, which may promote the development of ischemic stroke treatments in the future.
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Affiliation(s)
- Ran Chen
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xu Zhang
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Lijuan Gu
- Central Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Hua Zhu
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yi Zhong
- 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.,Central Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Zhihong Jian
- Department of Neurosurgery, Renmin Hospital of Wuhan University, Wuhan, China
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24
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Hammarlund ME, Darsalia V, Mjörnstedt F, Pattanaik B, Mallard C, Rocha-Ferreira E, Patrone C, Johansson M. The selective alpha7 nicotinic acetylcholine receptor agonist AR-R17779 does not affect ischemia-reperfusion brain injury in mice. Biosci Rep 2021; 41:BSR20210736. [PMID: 34008839 PMCID: PMC8200656 DOI: 10.1042/bsr20210736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/10/2021] [Accepted: 05/17/2021] [Indexed: 12/20/2022] Open
Abstract
Inflammation plays a central role in stroke-induced brain injury. The alpha7 nicotinic acetylcholine receptor (α7nAChR) can modulate immune responses in both the periphery and the brain. The aims of the present study were to investigate α7nAChR expression in different brain regions and evaluate the potential effect of the selective α7nAChR agonist AR-R17779 on ischemia-reperfusion brain injury in mice. Droplet digital PCR (ddPCR) was used to evaluate the absolute expression of the gene encoding α7nAChR (Chrna7) in hippocampus, striatum, thalamus and cortex in adult, naïve mice. Mice subjected to transient middle cerebral artery occlusion (tMCAO) or sham surgery were treated with α7nAChR agonist AR-R17779 (12 mg/kg) or saline once daily for 5 days. Infarct size and microglial activation 7 days after tMCAO were analyzed using immunohistochemistry. Chrna7 expression was found in all analyzed brain regions in naïve mice with the highest expression in cortex and hippocampus. At sacrifice, white blood cell count was significantly decreased in AR-R17779 treated mice compared with saline controls in the sham groups, although, no effect was seen in the tMCAO groups. Brain injury and microglial activation were evident 7 days after tMCAO. However, no difference was found between mice treated with saline or AR-R17779. In conclusion, α7nAChR expression varies in different brain regions and, despite a decrease in white blood cells in sham mice receiving AR-R17779, this compound does not affect stroke-induced brain injury.
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Affiliation(s)
- Maria E. Hammarlund
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Vladimer Darsalia
- Department of Clinical Science and Education, Södersjukhuset, Internal Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Filip Mjörnstedt
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Bagmi Pattanaik
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Carina Mallard
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Eridan Rocha-Ferreira
- Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Cesare Patrone
- Department of Clinical Science and Education, Södersjukhuset, Internal Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Maria E. Johansson
- Department of Physiology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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25
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Youssef ME, El-Mas MM, Abdelrazek HM, El-Azab MF. α7-nAChRs-mediated therapeutic angiogenesis accounts for the advantageous effect of low nicotine doses against myocardial infarction in rats. Eur J Pharmacol 2021; 898:173996. [PMID: 33684450 DOI: 10.1016/j.ejphar.2021.173996] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 02/26/2021] [Accepted: 02/28/2021] [Indexed: 12/20/2022]
Abstract
Angiogenesis accelerates tissue regeneration in a variety of ischemic conditions including myocardial infarction (MI). Here we tested the hypothesis that angiogenesis induced by α7-nicotinic acetylcholine receptors (α7-nAChRs) mitigates histopathological, electrocardiographic, and molecular consequences of MI in rats. These profiles were evaluated in the isoprenaline (85 mg/kg/day i. p. For 2 days) MI rat model treated with or without nicotine or PHA-543613 (PHA, selective α7-nAChR agonist). Isoprenaline-insulted rats showed (i) ECG signs of MI such as significant ST-segment elevations and prolonged QT-intervals, (ii) deteriorated left ventricular histopathological scoring and elevated inflammatory cell infiltration, (iii) reduced immunohistochemical expression of cardiac CD34, a surrogate marker of capillary density, (iv) decreased cardiac expression of iNOS and α7-nAChRs, and (v) adaptive increases in cardiac HO-1 expression and plasma angiogenic markers such as vascular endothelial growth factor (VEGF) and nitric oxide (NO). These effects of isoprenaline, except cardiac iNOS and α7-nAChRs downregulation, were ameliorated in rats treated with a low dose (20 μg/kg/day s. c. For 16 days) of nicotine or PHA. We also show that concurrent α7-nAChR blockade by methyllycaconitine (MLA, 40 μg/kg/day, for 16 days) reversed the ECG, histopathological, and capillary density effects of nicotine, thereby reinforcing the advantageous cardioprotective and anti-ischemic roles of α7-nAChRs in this setting. The observed results showed promising effects on isoprenaline induced myocardial damage. In conclusion, the activation of α7-nAChRs by doses of nicotine or PHA in the microgram scale promotes neovascularization and offers a promising therapeutic strategy for MI. CATEGORY: Cardiovascular Pharmacology.
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Affiliation(s)
- Mahmoud E Youssef
- Department of Pharmacology and Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Mahmoud M El-Mas
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt; Department of Pharmacology and Toxicology, Faculty of Medicine, Kuwait University, Kuwait
| | - Heba M Abdelrazek
- Department of Physiology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Mona F El-Azab
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Suez Canal University, Ismailia, Egypt.
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26
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Xu ZQ, Zhang JJ, Kong N, Zhang GY, Ke P, Han T, Su DF, Liu C. Autophagy is Involved in Neuroprotective Effect of Alpha7 Nicotinic Acetylcholine Receptor on Ischemic Stroke. Front Pharmacol 2021; 12:676589. [PMID: 33995108 PMCID: PMC8117007 DOI: 10.3389/fphar.2021.676589] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 04/14/2021] [Indexed: 01/14/2023] Open
Abstract
The α7 nicotinic acetylcholine receptor (α7nAChR) belongs to the superfamily of cys loop cationic ligand-gated channels, which consists of homogeneous α7 subunits. Although our lab found that activation of α7nAChR could alleviate ischemic stroke, the mechanism is still unknown. Herein, we explored whether autophagy is involved in the neuroprotective effect mediated by α7nAChR in ischemic stroke. Transient middle cerebral artery occlusion (tMCAO) and oxygen and glucose deprivation (OGD/R) exposure were applied to in vivo and in vitro models of ischemic stroke, respectively. Neurological deficit score and infarct volume were used to evaluate outcomes of tMCAO in the in vivo study. Autophagy-related proteins were detected by Western blot, and autophagy flux was detected by using tandem fluorescent mRFP-GFP-LC3 lentivirus. At 24 h after tMCAO, α7nAChR knockout mice showed worse neurological function and larger infarct volume than wild-type mice. PNU282987, an α7nAChR agonist, protected against OGD/R-induced neuronal injury, enhanced autophagy, and promoted autophagy flux. However, the beneficial effects of PNU282987 were eliminated by 3-methyladenine (3-MA), an autophagy inhibitor. Moreover, we found that PNU282987 treatment could activate the AMPK-mTOR-p70S6K signaling pathway in the in vitro study, while the effect was attenuated by compound C, an AMPK inhibitor. Our results demonstrated that the beneficial effect on neuronal survival via activation of α7nAChR was associated with enhanced autophagy, and the AMPK-mTOR-p70S6K signaling pathway was involved in α7nAChR activation-mediated neuroprotection.
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Affiliation(s)
- Zhe-Qi Xu
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Jing-Jing Zhang
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Ni Kong
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Guang-Yu Zhang
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Ping Ke
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Ting Han
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Ding-Feng Su
- Department of Pharmacy, Second Military Medical University, Shanghai, China
| | - Chong Liu
- Department of Pharmacy, Second Military Medical University, Shanghai, China
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27
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Afrashteh Nour M, Hajiasgharzadeh K, Kheradmand F, Asadzadeh Z, Bolandi N, Baradaran B. Nicotinic acetylcholine receptors in chemotherapeutic drugs resistance: An emerging targeting candidate. Life Sci 2021; 278:119557. [PMID: 33930371 DOI: 10.1016/j.lfs.2021.119557] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/11/2021] [Accepted: 04/19/2021] [Indexed: 12/13/2022]
Abstract
There is no definitive cure for cancer, and most of the current chemotherapy drugs have limited effects due to the development of drug resistance and toxicity at high doses. Therefore, there is an ongoing need for identifying the causes of chemotherapeutic resistance, and it will be possible to develop innovative treatment approaches based on these novel targeting candidates. Cigarette smoking is known to be one of the main causes of resistance to chemotherapeutic agents. Nicotine as a component of cigarette smoke is an exogenous activator of nicotinic acetylcholine receptors (nAChRs). It can inhibit apoptosis, increase cell proliferation and cell survival, reducing the cytotoxic effects of chemotherapy drugs and cause a reduced therapeutic response. Recent studies have demonstrated that nAChRs and their downstream signaling pathways have considerable implications in different cancer's initiation, progression, and chemoresistance. In some previous studies, nAChRs have been targeted to obtain better efficacies for chemotherapeutics. Besides, nAChRs-based therapies have been used in combination with chemotherapy drugs to reduce the side effects. This strategy requires lower doses of chemotherapy drugs compared to the conditions that must be used alone. Here, we discussed the experimental and clinical studies that show the nAChRs involvement in response to chemotherapy agents. Also, controversies relating to the effects of nAChR on chemotherapy-induced apoptosis are in our focus in this review article. Delineating the complex influences of nAChRs would be of great interest in establishing new effective chemotherapy regimens.
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Affiliation(s)
- Mina Afrashteh Nour
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Clinical Biochemistry, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Khalil Hajiasgharzadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Connective Tissue Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fatemeh Kheradmand
- Department of Clinical Biochemistry, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Zahra Asadzadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nadia Bolandi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Clinical Biochemistry, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, Iran; Neurosciences Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
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28
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Morales JY, Young-Stubbs CM, Shimoura CG, Kem WR, Uteshev VV, Mathis KW. Systemic Administration of α7-Nicotinic Acetylcholine Receptor Ligands Does Not Improve Renal Injury or Behavior in Mice With Advanced Systemic Lupus Erythematosus. Front Med (Lausanne) 2021; 8:642960. [PMID: 33928103 PMCID: PMC8076522 DOI: 10.3389/fmed.2021.642960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 03/18/2021] [Indexed: 01/04/2023] Open
Abstract
There is a critical need for safe treatment options to control inflammation in patients with systemic lupus erythematosus (SLE) since the inflammation contributes to morbidity and mortality in advanced disease. Endogenous neuroimmune mechanisms like the cholinergic anti-inflammatory pathway can be targeted to modulate inflammation, but the ability to manipulate such pathways and reduce inflammation and end organ damage has not been fully explored in SLE. Positive allosteric modulators (PAM) are pharmacological agents that inhibit desensitization of the nicotinic acetylcholine receptor (α7-nAChR), the main anti-inflammatory feature within the cholinergic anti-inflammatory pathway, and may augment α7-dependent cholinergic tone to generate therapeutic benefits in SLE. In the current study, we hypothesize that activating the cholinergic anti-inflammatory pathway at the level of the α7-nAChR with systemic administration of a partial agonist, GTS-21, and a PAM, PNU-120596, would reduce inflammation, eliminating the associated end organ damage in a mouse model of SLE with advanced disease. Further, we hypothesize that systemic α7 ligands will have central effects and improve behavioral deficits in SLE mice. Female control (NZW) and SLE mice (NZBWF1) were administered GTS-21 or PNU-120596 subcutaneously via minipumps for 2 weeks. We found that the increased plasma dsDNA autoantibodies, splenic and renal inflammation, renal injury and hypertension usually observed in SLE mice with advanced disease at 35 weeks of age were not altered by GTS-21 or PNU-120596. The anxiety-like behavior presented in SLE mice was also not improved by GTS-21 or PNU-120596. Although no significant beneficial effects of α7 ligands were observed in SLE mice at this advanced stage, we predict that targeting this receptor earlier in the pathogenesis of the disease may prove to be efficacious and should be addressed in future studies.
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Affiliation(s)
- Jessica Y Morales
- Department of Physiology and Anatomy, University of North Texas (UNT) Health Science Center, Fort Worth, TX, United States
| | - Cassandra M Young-Stubbs
- Department of Physiology and Anatomy, University of North Texas (UNT) Health Science Center, Fort Worth, TX, United States
| | - Caroline G Shimoura
- Department of Physiology and Anatomy, University of North Texas (UNT) Health Science Center, Fort Worth, TX, United States
| | - William R Kem
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL, United States
| | - Victor V Uteshev
- Department of Pharmacology and Neuroscience, University of North Texas (UNT) Health Science Center, Fort Worth, TX, United States
| | - Keisa W Mathis
- Department of Physiology and Anatomy, University of North Texas (UNT) Health Science Center, Fort Worth, TX, United States
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Central Activation of Alpha7 Nicotinic Signaling Attenuates LPS-Induced Neuroinflammation and Sickness Behavior in Adult but Not in Aged Animals. Molecules 2021; 26:molecules26082107. [PMID: 33916910 PMCID: PMC8067582 DOI: 10.3390/molecules26082107] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/29/2021] [Accepted: 04/01/2021] [Indexed: 12/13/2022] Open
Abstract
We previously reported that lipopolysaccharide (LPS) challenge caused microglial-mediated neuroinflammation and sickness behavior that was amplified in aged mice. As α7 nAChRs are implicated in the "Cholinergic anti-inflammatory pathway", we aimed to determine how α7 nAChR stimulation modulates microglial phenotype in an LPS-induced neuroinflammation model in adult and aged mice. For this, BALB/c mice were injected intraperitoneally with LPS (0.33 mg/kg) and treated with the α7 nAChR agonist PNU282987, using different administration protocols. LPS challenge reduced body weight and induced lethargy and social withdrawal in adult mice. Peripheral (intraperitoneal) co-administration of the α7 nAChR agonist PNU282987 with LPS, attenuated body weight loss and sickness behavior associated with LPS challenge in adult mice, and reduced microglial activation with suppression of IL-1β and TNFα mRNA levels. Furthermore, central (intracerebroventricular) administration of the α7 nAChR agonist, even 2 h after LPS injection, attenuated the decrease in social exploratory behavior and microglial activation induced by peripheral administration of LPS, although this recovery was not achieved if activation of α7 nAChRs was performed peripherally. Finally, we observed that the positive results of central activation of α7 nAChRs were lost in aged mice. In conclusion, we provide evidence that stimulation of α7 nAChR signaling reduces microglial activation in an in vivo LPS-based model, but this cholinergic-dependent regulation seems to be dysfunctional in microglia of aged mice.
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Bai S, Wen W, Hou X, Wu J, Yi L, Zhi Y, Lv Y, Tan X, Liu L, Wang P, Zhou H, Dong Y. Inhibitory effect of sinomenine on lung cancer cells via negative regulation of α7 nicotinic acetylcholine receptor. J Leukoc Biol 2021; 109:843-852. [PMID: 32726882 DOI: 10.1002/jlb.6ma0720-344rrr] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 07/10/2020] [Accepted: 07/19/2020] [Indexed: 12/19/2022] Open
Abstract
Lung cancer is the leading cause of cancer deaths worldwide, with a high morbidity and less than 20% survival rate. Therefore, new treatment strategies and drugs are needed to reduce the mortality of patients with lung cancer. α7 nicotinic acetylcholine receptor (α7 nAChR), as a receptor of nicotine and its metabolites, is a potential target for lung cancer treatment. Our previous studies revealed that sinomenine plays anti-inflammation roles via α7 nAChR and down-regulates the expression of this receptor, thus increasing the inflammatory response. Hence, sinomenine is possibly a natural ligand of this receptor. In the present study, the effects of sinomenine on lung cancer A549 cells and tumor-bearing mice were determined to investigate whether this alkaloid has an inhibitory effect on lung cancer via α7 nAChR. CCK-8 assay, wound-healing test, and flow cytometry were performed for cell proliferation, cell migration, and apoptosis analysis in vitro, respectively. Xenograft mice were used to evaluate the effects of sinomenine in vivo. Results showed that sinomenine decreased cell proliferation and migration abilities but increased the percentage of apoptotic cells. Tumor volume in tumor-bearing mice was significantly reduced after sinomenine treatment compared with that in the vehicle group mice (p < 0.05). Furthermore, the effects of sinomenine were abolished by the α7 nAChR antagonist mecamylamine and the allosteric modulator PNU-120596, but no change occurred when the mice were pretreated with the muscarinic acetylcholine receptor antagonist atropine. Meanwhile, sinomenine suppressed α7 nAChR expression in vitro and in vivo, as well as the related signaling molecules pERK1/2 and ERK1/2 and the transcription factors TTF-1 and SP-1. By contrast, sinomenine up-regulated the expression of another transcription factor, Egr-1. These effects were restricted by mecamylamine and PNU but not by atropine. Results suggested that sinomenine can inhibit lung cancer via α7 nAChR in a negative feedback mode.
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Affiliation(s)
- Shasha Bai
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Wenhao Wen
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Xuenan Hou
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Jiexiu Wu
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Lang Yi
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Yingkun Zhi
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Yanjun Lv
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Xiaoqin Tan
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Liang Liu
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macao, P. R. China
| | - Peixun Wang
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
| | - Hua Zhou
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macao, P. R. China
| | - Yan Dong
- Guangzhou University of Chinese Medicine, Guangzhou, P. R. China
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Fu X, Zong T, Yang P, Li L, Wang S, Wang Z, Li M, Li X, Zou Y, Zhang Y, Htet Aung LH, Yang Y, Yu T. Nicotine: Regulatory roles and mechanisms in atherosclerosis progression. Food Chem Toxicol 2021; 151:112154. [PMID: 33774093 DOI: 10.1016/j.fct.2021.112154] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/22/2021] [Accepted: 03/19/2021] [Indexed: 02/06/2023]
Abstract
Smoking is an independent risk factor for atherosclerosis. The smoke produced by tobacco burning contains more than 7000 chemicals, among which nicotine is closely related to the occurrence and development of atherosclerosis. Nicotine, a selective cholinergic agonist, accelerates the formation of atherosclerosis by stimulating nicotinic acetylcholine receptors (nAChRs) located in neuronal and non-neuronal tissues. This review introduces the pathogenesis of atherosclerosis and the mechanisms involving nicotine and its receptors. Herein, we focus on the various roles of nicotine in atherosclerosis, such as upregulation of growth factors, inflammation, and the dysfunction of endothelial cells, vascular smooth muscle cells (VSMC) as well as macrophages. In addition, nicotine can stimulate the generation of reactive oxygen species, cause abnormal lipid metabolism, and activate immune cells leading to the onset and progression of atherosclerosis. Exosomes, are currently a research hotspot, due to their important connections with macrophages and the VSMC, and may represent a novel application into future preventive treatment to promote the prevention of smoking-related atherosclerosis. In this review, we will elaborate on the regulatory mechanism of nicotine on atherosclerosis, as well as the effects of interference with nicotine receptors and the use of exosomes to prevent atherosclerosis development.
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Affiliation(s)
- Xiuxiu Fu
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Tingyu Zong
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Panyu Yang
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Lin Li
- Department of Vascular Surgery, The Qingdao Hiser Medical Center, Qingdao, Shandong Province, China
| | - Shizhong Wang
- The Department of Cardiovascular Surgery, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 66000, People's Republic of China
| | - Zhibin Wang
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Min Li
- Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, No. 38 Dengzhou Road, Qingdao, 266021, People's Republic of China
| | - Xiaolu Li
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Yulin Zou
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Ying Zhang
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China
| | - Lynn Htet Htet Aung
- Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, No. 38 Dengzhou Road, Qingdao, 266021, People's Republic of China
| | - Yanyan Yang
- Department of Immunology, School of Basic Medicine, Qingdao University, No. 308 Ningxia Road, Qingdao, 266021, People's Republic of China.
| | - Tao Yu
- Department of Cardiac Ultrasound, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao, 266000, People's Republic of China; Institute for Translational Medicine, The Affiliated Hospital of Qingdao University, No. 38 Dengzhou Road, Qingdao, 266021, People's Republic of China.
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32
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Yang H, Zhang Y, Chen H, Zhu Y, Li Y, Ouyang F, Chu L, Liu D. Mir-184 Contributes to Brain Injury Through Targeting PPAP2B Following Ischemic Stroke in Male Rats. Front Mol Neurosci 2021; 14:613887. [PMID: 33833666 PMCID: PMC8021718 DOI: 10.3389/fnmol.2021.613887] [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: 10/04/2020] [Accepted: 02/10/2021] [Indexed: 12/05/2022] Open
Abstract
Our previous study revealed that miR-184 expression is significantly altered in the brain following ischemic stroke in rats. However, it is unknown whether this alteration in miR-184 expression contributes to brain injury after ischemic stroke. Here, we aim to address the potential of miR-184 to impact nerve injury following ischemia and reperfusion. Rats received ICV injection of miR-184 adenovirus or empty vector and were subjected to right middle cerebral artery occlusion (MCAO) to establish an ischemic stroke model. We cultured SH-SY5Y cells under oxygen-glucose deprivation/reoxygenation (OGD/R) and transfected them with miR-184 lentivirus to explore the primary mechanisms. To evaluate miR-184 expression, neurological function deficits, the cerebral infarct volume, cell viability, and apoptosis, qRT-PCR analysis of miR-184 expression, the modified neurological severity score (mNSS) system, TTC staining, the CCK-8 assay, flow cytometry, and dual-luciferase reporter assays were utilized. We found that miR-184 expression was downregulated and that the cerebral infarct volume and mNSSs were increased following ischemic stroke; however, increasing the level of miR-184 alleviated brain damage. Overexpression of miR-184 resulted in increased viability and reduced apoptosis of SH-SY5Y cells following OGD/R in vitro. We identified the phosphatidic acid phosphatase type 2B (PPAP2B) gene as a direct target gene of miR-184. In summary, our results reveal that attenuation of miR-184 levels in ischemic stroke contributes to ischemic injury through targeting PPAP2B mRNA-mediated apoptosis, which may be a promising therapeutic target for ischemic stroke.
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Affiliation(s)
- Huajun Yang
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China.,Department of Respiratory Medicine, The First People's Hospital of Zunyi, The Third Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Yifan Zhang
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Hongqun Chen
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Yingwu Zhu
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Yuan Li
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Fu Ouyang
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Lan Chu
- Department of Neurology, Affiliated Hospital of Guizhou Medical University, Guizhou Medical University, Guiyang, China
| | - Daishun Liu
- Department of Respiratory Medicine, The First People's Hospital of Zunyi, The Third Affiliated Hospital of Zunyi Medical University, Zunyi, China
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33
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Liu C, Liu S, Xiong L, Zhang L, Li X, Cao X, Xue J, Li L, Huang C, Huang Z. Genistein-3'-sodium sulfonate Attenuates Neuroinflammation in Stroke Rats by Down-Regulating Microglial M1 Polarization through α7nAChR-NF-κB Signaling Pathway. Int J Biol Sci 2021; 17:1088-1100. [PMID: 33867831 PMCID: PMC8040300 DOI: 10.7150/ijbs.56800] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Accepted: 02/22/2021] [Indexed: 12/22/2022] Open
Abstract
Microglial M1 depolarization mediated prolonged inflammation contributing to brain injury in ischemic stroke. Our previous study revealed that Genistein-3'-sodium sulfonate (GSS) exerted neuroprotective effects in ischemic stroke. This study aimed to explore whether GSS protected against brain injury in ischemic stroke by regulating microglial M1 depolarization and its underlying mechanisms. We established transient middle cerebral artery occlusion and reperfusion (tMCAO) model in rats and used lipopolysaccharide (LPS)-stimulated BV2 microglial cells as in vitro model. Our results showed that GSS treatment significantly reduced the brain infarcted volume and improved the neurological function in tMCAO rats. Meanwhile, GSS treatment also dramatically reduced microglia M1 depolarization and IL-1β level, reversed α7nAChR expression, and inhibited the activation of NF-κB signaling in the ischemic penumbra brain regions. These effects of GSS were further verified in LPS-induced M1 depolarization of BV2 cells. Furthermore, pretreatment of α7nAChR inhibitor (α-BTX) significantly restrained the neuroprotective effect of GSS treatment in tMCAO rats. α-BTX also blunted the regulating effects of GSS on neuroinflammation, M1 depolarization and NF-κB signaling activation. This study demonstrates that GSS protects against brain injury in ischemic stroke by reducing microglia M1 depolarization to suppress neuroinflammation in peri-infarcted brain regions through upregulating α7nAChR and thereby inhibition of NF-κB signaling. Our findings uncover a potential molecular mechanism for GSS treatment in ischemic stroke.
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Affiliation(s)
- Chaoming Liu
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Pathobiology, JiangXi College of Traditional Chinese Medicine, Fuzhou, 344000, China
| | - Song Liu
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
| | - Lijiao Xiong
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - Limei Zhang
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
| | - Xiao Li
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
| | - Xingling Cao
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
| | - Jinhua Xue
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
| | - Liangdong Li
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - Cheng Huang
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
| | - Zhihua Huang
- Key Laboratory of Prevention and treatment of cardiovascular and cerebrovascular diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Physiology, School of Basic Medical Sciences, Gannan Medical University, Ganzhou 341000, China
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Guo J, Yang G, He Y, Xu H, Fan H, An J, Zhang L, Zhang R, Cao G, Hao D, Yang H. Involvement of α7nAChR in the Protective Effects of Genistein Against β-Amyloid-Induced Oxidative Stress in Neurons via a PI3K/Akt/Nrf2 Pathway-Related Mechanism. Cell Mol Neurobiol 2021; 41:377-393. [PMID: 33215356 DOI: 10.1007/s10571-020-01009-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 11/12/2020] [Indexed: 12/15/2022]
Abstract
Abnormal excessive production and deposition of β-amyloid (Aβ) peptides in selectively susceptible brain regions are thought to be a key pathogenic mechanism underlying Alzheimer's disease (AD), resulting in memory deficits and cognitive impairment. Genistein is a phytoestrogen with great promise for counteracting diverse Aβ-induced insults, including oxidative stress and mitochondrial dysfunction. However, the exact molecular mechanism or mechanisms underlying the neuroprotective effects of genistein against Aβ-induced insults are largely uncharacterized. To further elucidate the possible mechanism(s) underlying these protective effects, we investigated the neuroprotective effects of genistein against Aβ-induced oxidative stress mediated by orchestrating α7 nicotinic acetylcholine receptor (α7nAChR) signaling in rat primary hippocampal neurons. Genistein significantly increased cell viability, reduced the number of apoptotic cells, decreased accumulation of reactive oxygen species (ROS), decreased contents of malondialdehyde (MDA) and lactate dehydrogenase (LDH), upregulated BCL-2 expression, and suppressed Caspase-3 activity occurring after treatment with 25 μM Aβ25-35. Simultaneously, genistein markedly inhibited the decreases in α7nAChR mRNA and protein expression in cells treated with Aβ25-35. In addition, α7nAChR signaling was intimately involved in the genistein-mediated activation of phosphatidylinositol 3-kinase (PI3K)/Akt and Nrf2/keap1 signaling. Thus, α7nAChR activity together with the PI3K/Akt/Nrf2 signaling cascade likely orchestrates the molecular mechanism underlying the neuroprotective effects of genistein against Aβ-induced oxidative injury.
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Affiliation(s)
- Jianbin Guo
- Department of Joint Surgery, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Guoqing Yang
- Department of Anesthesiology, The Second Affiliated Hospital of Shaanxi University of Traditional Chinese Medicine, Xianyang, 712000, Shaanxi, China
| | - Yuqing He
- School of Basic Medicine, Ningxia Medical University, Yinchuan, 750004, China
| | - Huiming Xu
- Stem Cell Research Center, Renji Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200127, China
| | - Hong Fan
- Department of Spine Surgery, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Jing An
- Translational Medicine Center, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Lingling Zhang
- Translational Medicine Center, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Rui Zhang
- Translational Medicine Center, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China
| | - Guihua Cao
- Department of Geriatrics, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710069, China
| | - Dingjun Hao
- Department of Spine Surgery, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China.
| | - Hao Yang
- Translational Medicine Center, Hong Hui Hospital, Xi'an Jiaotong University, Xi'an, 710054, China.
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35
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Gaidhani N, Tucci FC, Kem WR, Beaton G, Uteshev VV. Therapeutic efficacy of α7 ligands after acute ischaemic stroke is linked to conductive states of α7 nicotinic ACh receptors. Br J Pharmacol 2021; 178:1684-1704. [PMID: 33496352 DOI: 10.1111/bph.15392] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 12/22/2020] [Accepted: 01/21/2021] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND PURPOSE Targeting α7 nicotinic ACh receptors (nAChRs) in neuroinflammatory disorders including acute ischaemic stroke holds significant therapeutic promise. However, therapeutically relevant signalling mechanisms remain unidentified. Activation of neuronal α7 nAChRs triggers ionotropic signalling, but there is limited evidence for it in immunoglial tissues. The α7 ligands which are effective in reducing acute ischaemic stroke damage promote α7 ionotropic activity, suggesting a link between their therapeutic effects for treating acute ischaemic stroke and activation of α7 conductive states. EXPERIMENTAL APPROACH This hypothesis was tested using a transient middle cerebral artery occlusion (MCAO) model of acute ischaemic stroke, NS6740, a known selective non-ionotropic agonist of α7 nAChRs and 4OH-GTS-21, a partial α7 agonist. NS6740-like ligands exhibiting low efficacy/potency for ionotropic activity will be referred to as non-ionotropic agonists or "metagonists". KEY RESULTS 4OH-GTS-21, used as a positive control, significantly reduced neurological deficits and brain injury after MCAO as compared to vehicle and NS6740. By contrast, NS6740 was ineffective in identical assays and reversed the effects of 4OH-GTS-21 when these compounds were co-applied. Electrophysiological recordings from acute hippocampal slices obtained from NS6740-injected animals demonstrated its remarkable brain availability and protracted effects on α7 nAChRs as evidenced by sustained (>8 h) alterations in α7 ionotropic responsiveness. CONCLUSION AND IMPLICATIONS These results suggest that α7 ionotropic activity may be obligatory for therapeutic efficacy of α7 ligands after acute ischaemic stroke yet, highlight the potential for selective application of α7 ligands to disease states based on their mode of receptor activation.
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Affiliation(s)
- Nikhil Gaidhani
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, USA
| | - Fabio C Tucci
- Epigen Biosciences, Inc., San Diego, California, USA
| | - William R Kem
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Graham Beaton
- Epigen Biosciences, Inc., San Diego, California, USA
| | - Victor V Uteshev
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, Texas, USA
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36
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Verma MK, Goel RN, Bokare AM, Dandekar MP, Koul S, Desai S, Tota S, Singh N, Nigade PB, Patil VB, Modi D, Mehta M, Gundu J, Walunj SS, Karche NP, Sinha N, Kamboj RK, Palle VP. LL-00066471, a novel positive allosteric modulator of α7 nicotinic acetylcholine receptor ameliorates cognitive and sensorimotor gating deficits in animal models: Discovery and preclinical characterization. Eur J Pharmacol 2021; 891:173685. [PMID: 33127363 DOI: 10.1016/j.ejphar.2020.173685] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 10/21/2020] [Accepted: 10/26/2020] [Indexed: 01/20/2023]
Abstract
α7 nicotinic acetylcholine receptor (α7 nAChR) is an extensively validated target for several neurological and psychiatric conditions namely, dementia and schizophrenia, owing to its vital roles in cognition and sensorimotor gating. Positive allosteric modulation (PAM) of α7 nAChR represents an innovative approach to amplify endogenous cholinergic signaling in a temporally restricted manner in learning and memory centers of brain. α7 nAChR PAMs are anticipated to side-step burgeoning issues observed with several clinical-stage orthosteric α7 nAChR agonists, related to selectivity, tolerance/tachyphylaxis, thus providing a novel dimension in therapeutic strategy and pharmacology of α7 nAChR ion-channel. Here we describe a novel α7 nAChR PAM, LL-00066471, which potently amplified agonist-induced Ca2+ fluxes in neuronal IMR-32 neuroblastoma cells in a α-bungarotoxin (α-BTX) sensitive manner. LL-00066471 showed excellent oral bioavailability across species (mouse, rat and dog), low clearance and good brain penetration (B/P ratio > 1). In vivo, LL-00066471 robustly attenuated cognitive deficits in both procognitive and antiamnesic paradigms of short-term episodic and recognition memory in novel object recognition task (NORT) and social recognition task (SRT), respectively. Additionally, LL-00066471 mitigated apomorphine-induced sensorimotor gating deficits in acoustic startle reflex (ASR) and enhanced antipsychotic efficacy of olanzapine in conditioned avoidance response (CAR) task. Further, LL-00066471 corrected redox-imbalances and reduced cortico-striatal infarcts in stroke model. These finding together suggest that LL-00066471 has potential to symptomatically alleviate cognitive deficits associated with dementias, attenuate sensorimotor gating deficits in schizophrenia and correct redox-imbalances in cerebrovascular disorders. Therefore, LL-00066471 presents potential for management of cognitive impairments associated with neurological and psychiatric conditions.
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MESH Headings
- Animals
- Behavior, Animal/drug effects
- Brain/drug effects
- Brain/metabolism
- Brain/physiopathology
- Cell Line, Tumor
- Cholinergic Agents/pharmacokinetics
- Cholinergic Agents/pharmacology
- Cognition/drug effects
- Cognitive Dysfunction/metabolism
- Cognitive Dysfunction/physiopathology
- Cognitive Dysfunction/prevention & control
- Cognitive Dysfunction/psychology
- Disease Models, Animal
- Dogs
- Exploratory Behavior/drug effects
- Gait Disorders, Neurologic/metabolism
- Gait Disorders, Neurologic/physiopathology
- Gait Disorders, Neurologic/prevention & control
- Gait Disorders, Neurologic/psychology
- Ischemic Stroke/drug therapy
- Ischemic Stroke/metabolism
- Ischemic Stroke/physiopathology
- Male
- Mice, Inbred BALB C
- Open Field Test/drug effects
- Oxidative Stress/drug effects
- Rats, Sprague-Dawley
- Rats, Wistar
- Reflex, Startle/drug effects
- Sensory Gating/drug effects
- Signal Transduction
- Social Behavior
- alpha7 Nicotinic Acetylcholine Receptor/drug effects
- alpha7 Nicotinic Acetylcholine Receptor/metabolism
- Mice
- Rats
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Affiliation(s)
- Mahip K Verma
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India.
| | - Rajan N Goel
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Anand M Bokare
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Manoj P Dandekar
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Sarita Koul
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Sagar Desai
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Santoshkumar Tota
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Nilendra Singh
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Prashant B Nigade
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Vinod B Patil
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Dipak Modi
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Maneesh Mehta
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Jayasagar Gundu
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Sameer S Walunj
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Navnath P Karche
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Neelima Sinha
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Rajender K Kamboj
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
| | - Venkata P Palle
- Department of Pharmacology, Novel Drug Discovery and Development, Lupin Limited, Lupin Research Park, Pune, Maharashtra, 412115, India
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Huang J, Lyu H, Huo K, Do Prado LB, Tang C, Wang Z, Li Q, Wong J, Su H. Bone Fracture Enhanced Blood-Brain Barrier Breakdown in the Hippocampus and White Matter Damage of Stroke Mice. Int J Mol Sci 2020; 21:ijms21228481. [PMID: 33187248 PMCID: PMC7697771 DOI: 10.3390/ijms21228481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/30/2020] [Accepted: 11/09/2020] [Indexed: 02/06/2023] Open
Abstract
Background: Tibia fracture (BF) before stroke shortly causes long-term post-stroke memory dysfunction in mice. The mechanism is unclear. We hypothesize that BF enhances neuroinflammation and blood brain barrier (BBB) breakdown in the hippocampus and white matter (WM) damage. Methods: Mice were assigned to groups: BF, stroke, BF+stroke (BF 6 h before stroke) and sham. BBB integrity was analyzed 3 days after the surgeries and WM injury was analyzed 3 days and 8 weeks after the surgeries. Results: Stroke and BF+stroke groups had more activated microglia/macrophages and lower levels of claudin-5 in the ipsilateral hippocampi than the BF group. BF+stroke group had the highest number microglia/macrophages and the lowest level of claudin-5 among all groups and had fewer pericytes than BF group. Stroke and BF+stroke groups had smaller WM areas in the ipsilateral basal ganglia than the sham group 8 weeks after the injuries. The BF+stroke group also had smaller WM areas in the ipsilateral than sham and BF groups 3 days after the injuries and in the contralateral basal ganglia than stroke and BF groups 8 weeks after the injuries. Conclusions: BF exacerbates neuroinflammation and BBB leakage in the hippocampus and WM damage in basal ganglia, which could contribute to the long-lasting memory dysfunction in BF+stroke mice.
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Affiliation(s)
- Jinhao Huang
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Haiyan Lyu
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Kang Huo
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Leandro B. Do Prado
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Chaoliang Tang
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Zhanqiang Wang
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Qifeng Li
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Julia Wong
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
| | - Hua Su
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA 94143, USA; (J.H.); (H.L.); (K.H.); (L.B.D.P.); (C.T.); (Z.W.); (Q.L.); (J.W.)
- Center for Cerebrovascular Research, University of California, San Francisco, CA 94143, USA
- Correspondence: ; Tel.: +1-628-206-3162
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Gaidhani N, Kem WR, Uteshev VV. Spleen is not required for therapeutic effects of 4OH-GTS-21, a selective α7 nAChR agonist, in the sub-acute phase of ischemic stroke in rats. Brain Res 2020; 1751:147196. [PMID: 33159972 DOI: 10.1016/j.brainres.2020.147196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/29/2020] [Accepted: 10/30/2020] [Indexed: 11/15/2022]
Abstract
Acute ischemic stroke (AIS) causes both central and peripheral inflammation, while activation of α7 nicotinic acetylcholine receptors (nAChRs) provides both central and peripheral anti-inflammatory and anti-apoptotic effects. Here, we provide evidence that 4OH-GTS-21, a selective α7 agonist, produces its therapeutic effects via primarily central sites of action because 4OH-GTS-21 was found equally effective in splenectomized and non-spenectomized rats in the sub-acute phase of ischemic stroke (≤1 week). However, the spleen may boost the therapeutic efficacy of 4OH-GTS-21 in certain behavioral tasks as our data also indicated. In our tests, AIS was modeled by transient middle cerebral artery occlusion (tMCAO). Splenectomy was done 2 weeks before tMCAO. We determined that: 1) Daily 4OH-GTS-21 treatments for 7 days after tMCAO significantly reduced neurological deficits and brain injury in both splenectomized and non-spelenectomized rats demonstrating that the spleen is not required for therapeutic benefits of 4OH-GTS-21; 2) The effects of 4OH-GTS-21 in the adhesive sticker removal test were significantly weaker in splenectomized animals suggesting that the spleen boosts the efficacy of 4OH-GTS-21 in the first week after tMCAO; and 3) Ischemic brain injury was not significantly affected by splenectomy in both vehicle-treated and 4OH-GTS-21-treated animals. These data support the hypothesis that the therapeutic efficacy of sub-chronic (≤1 week) 4OH-GTS-21 primarily originates from central sites of action. These results validate brain availability as a critical factor for developing novel α7 ligands for AIS.
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Affiliation(s)
- Nikhil Gaidhani
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, United States
| | - William R Kem
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, 1200 Newell Drive, Gainesville, FL 32610, United States
| | - Victor V Uteshev
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, 3500 Camp Bowie Blvd., Fort Worth, TX 76107, United States.
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YUAN M, ZHANG XX, FU XC, BI X. Enriched environment alleviates post-stroke cognitive impairment through enhancing α7-nAChR expression in rats. ARQUIVOS DE NEURO-PSIQUIATRIA 2020; 78:603-610. [DOI: 10.1590/0004-282x20200081] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 03/03/2020] [Indexed: 12/31/2022]
Abstract
ABSTRACT Background: Enriched environment (EE) is a simple and effective intervention to improve cognitive function in post-stroke cognitive impairment (PSCI), partly due to the rebalancing of the cholinergic signaling pathway in the hippocampus. α7-nicotinic acetylcholine receptor (α7-nAChR) is a cholinergic receptor whose activation inhibits inflammation and promotes the recovery of neurological function in PSCI patients. However, it is still unclear whether EE can regulate α7-nAChR and activate the cholinergic anti-inflammatory pathway (CAP) in PSCI. Objective: To investigate the effects of EE on cognitive impairment, and the role of α7-nAChR in PSCI. Methods: A PSCI rat model was induced by middle cerebral artery occlusion and reperfusion (MCAO/R) and were reared in standard environment (SE) or EE for 28d, control group with sham surgery. Cognitive function was determined by Morris water maze test. The long-term potentiation (LTP) was assessed by Electrophysiology. Histopathological methods were used to determine infarct volume, α7-nAChR expression and the cytokines and cholinergic proteins expression. Results: Compared with SE group, rats in EE group had better cognitive function, higher expression of α7-nAChR positive neurons in hippocampal CA1 region. In addition, EE attenuated unfavorable changes induced by MCAO/R in cytokines and cholinergic proteins, and also enhanced LTP promoted by nicotine and attenuated by α-BGT; but showed no significantly difference in infarct volume. Conclusions: EE markedly improves cognitive impairment and enhances neuroplasticity in PSCI rats, which may be closely related to enhancement of α7-nAChR expression.
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Affiliation(s)
- Mei YUAN
- Shanghai University of Sport, China
| | | | | | - Xia BI
- Shanghai University of Medicine & Health Sciences, China
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Allosterism of Nicotinic Acetylcholine Receptors: Therapeutic Potential for Neuroinflammation Underlying Brain Trauma and Degenerative Disorders. Int J Mol Sci 2020; 21:ijms21144918. [PMID: 32664647 PMCID: PMC7404387 DOI: 10.3390/ijms21144918] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 07/06/2020] [Accepted: 07/10/2020] [Indexed: 12/21/2022] Open
Abstract
Inflammation is a key physiological phenomenon that can be pervasive when dysregulated. Persistent chronic inflammation precedes several pathophysiological conditions forming one of the critical cellular homeostatic checkpoints. With a steady global surge in inflammatory diseases, it is imperative to delineate underlying mechanisms and design suitable drug molecules targeting the cellular partners that mediate and regulate inflammation. Nicotinic acetylcholine receptors have a confirmed role in influencing inflammatory pathways and have been a subject of scientific scrutiny underlying drug development in recent years. Drugs designed to target allosteric sites on the nicotinic acetylcholine receptors present a unique opportunity to unravel the role of the cholinergic system in regulating and restoring inflammatory homeostasis. Such a therapeutic approach holds promise in treating several inflammatory conditions and diseases with inflammation as an underlying pathology. Here, we briefly describe the potential of cholinergic allosterism and some allosteric modulators as a promising therapeutic option for the treatment of neuroinflammation.
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Donat CK, Hansen HH, Hansen HD, Mease RC, Horti AG, Pomper MG, L’Estrade ET, Herth MM, Peters D, Knudsen GM, Mikkelsen JD. In Vitro and In Vivo Characterization of Dibenzothiophene Derivatives [ 125I]Iodo-ASEM and [ 18F]ASEM as Radiotracers of Homo- and Heteromeric α7 Nicotinic Acetylcholine Receptors. Molecules 2020; 25:molecules25061425. [PMID: 32245032 PMCID: PMC7144377 DOI: 10.3390/molecules25061425] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/25/2020] [Accepted: 02/27/2020] [Indexed: 12/18/2022] Open
Abstract
The α7 nicotinic acetylcholine receptor (α7 nAChR) is involved in several cognitive and physiologic processes; its expression levels and patterns change in neurologic and psychiatric diseases, such as schizophrenia and Alzheimer’s disease, which makes it a relevant drug target. Development of selective radioligands is important for defining binding properties and occupancy of novel molecules targeting the receptor. We tested the in vitro binding properties of [125I]Iodo-ASEM [(3-(1,4-diazabycyclo[3.2.2]nonan-4-yl)-6-(125I-iododibenzo[b,d]thiopentene 5,5-dioxide)] in the mouse, rat and pig brain using autoradiography. The in vivo binding properties of [18F]ASEM were investigated using positron emission tomography (PET) in the pig brain. [125I]Iodo-ASEM showed specific and displaceable high affinity (~1 nM) binding in mouse, rat, and pig brain. Binding pattern overlapped with [125I]α-bungarotoxin, specific binding was absent in α7 nAChR gene-deficient mice and binding was blocked by a range of α7 nAChR orthosteric modulators in an affinity-dependent order in the pig brain. Interestingly, relative to the wild-type, binding in β2 nAChR gene-deficient mice was lower for [125I]Iodo-ASEM (58% ± 2.7%) than [125I]α-bungarotoxin (23% ± 0.2%), potentially indicating different binding properties to heteromeric α7β2 nAChR. [18F]ASEM PET in the pig showed high brain uptake and reversible tracer kinetics with a similar spatial distribution as previously reported for α7 nAChR. Blocking with SSR-180,711 resulted in a significant decrease in [18F]ASEM binding. Our findings indicate that [125I]Iodo-ASEM allows sensitive and selective imaging of α7 nAChR in vitro, with better signal-to-noise ratio than previous tracers. Preliminary data of [18F]ASEM in the pig brain demonstrated principal suitable kinetic properties for in vivo quantification of α7 nAChR, comparable to previously published data.
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Affiliation(s)
- Cornelius K. Donat
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
- Department of Brain Sciences, Imperial College London, London W12 0 LS, UK
- Correspondence: (C.K.D.); (J.D.M.); Tel.: +45-40205378 (J.D.M)
| | - Henrik H. Hansen
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
| | - Hanne D. Hansen
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
| | - Ronnie C. Mease
- Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (R.C.M.); (A.G.H.); (M.G.P.)
| | - Andrew G. Horti
- Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (R.C.M.); (A.G.H.); (M.G.P.)
| | - Martin G. Pomper
- Russell H. Morgan Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA; (R.C.M.); (A.G.H.); (M.G.P.)
| | - Elina T. L’Estrade
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
- Department of Drug Design and Pharmacology, University of Copenhagen, Jagtvej 162, 2100 Copenhagen, Denmark;
- Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark
| | - Matthias M. Herth
- Department of Drug Design and Pharmacology, University of Copenhagen, Jagtvej 162, 2100 Copenhagen, Denmark;
- Department of Clinical Physiology, Nuclear Medicine & PET, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen, Denmark
| | | | - Gitte M. Knudsen
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
| | - Jens D. Mikkelsen
- Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen, Denmark; (H.H.H.); (H.D.H.); (E.T.L.); (G.M.K.)
- Correspondence: (C.K.D.); (J.D.M.); Tel.: +45-40205378 (J.D.M)
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Li Z, Wei M, Lyu H, Huo K, Wang L, Zhang M, Su H. Fracture shortly before stroke in mice leads to hippocampus inflammation and long-lasting memory dysfunction. J Cereb Blood Flow Metab 2020; 40:446-455. [PMID: 30667320 PMCID: PMC7370615 DOI: 10.1177/0271678x19825785] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cognitive impairment occurs in stroke and hip fracture patients. In mice, bone fracture (BF) exacerbates stroke-related neuronal damage and sensorimotor dysfunction. We hypothesize that BF exacerbates post-stroke cognitive impairment. Adult mice were randomly assigned into BF, stroke, BF+stroke (BF 6 h before stroke), and control (sham operated) groups. Memory function was evaluated weekly for eight weeks by Y maze test and at eight weeks post-surgeries by novel object recognition (NOR) test. The neuronal damage and inflammation in hippocampus were analyzed three days and eight weeks after the surgeries. In Y maze test, BF+stroke mice started making fewer alternations than controls two weeks after the surgeries. Significant difference between BF+stroke and stroke groups started at five weeks post-injury and continued to the end of the experiment. In NOR test, BF+stroke group spent less time on novel objective than that of other groups. Cx3cr1+ cells and CD68+ cells accumulated in the stratum lacunosum moleculare (SLM) on the ipsilateral side of stroke injury in stroke and BF+stroke mice. BF+stroke mice had a higher ratio of ipsilateral/contralateral Cx3cr1+ cell-density than that of stroke mice. Therefore, BF shortly before stroke exacerbates hippocampal inflammation and causes long-lasting memory dysfunction.
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Affiliation(s)
- Zhengxi Li
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Meng Wei
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Haiyan Lyu
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Kang Huo
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Liang Wang
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Meng Zhang
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Hua Su
- Center for Cerebrovascular Research, Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
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Xue R, Wan Y, Sun X, Zhang X, Gao W, Wu W. Nicotinic Mitigation of Neuroinflammation and Oxidative Stress After Chronic Sleep Deprivation. Front Immunol 2019; 10:2546. [PMID: 31736967 PMCID: PMC6828928 DOI: 10.3389/fimmu.2019.02546] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 10/14/2019] [Indexed: 12/12/2022] Open
Abstract
Sleep deprivation negatively influences all aspects of health. Oxidative stress and inflammatory responses induced by sleep deprivation participate in its adverse effects but the regulatory mechanisms to counteract them remain poorly understood. In mice subjected to sleep deprivation for 7 days, we found activation of microglia and astrocyte accompanied by down-regulation of α7 nicotinic acetylcholine receptor (α7-nAChR) and reduced activation of downstream PI3K/AKT/GSK-3β. These changes occurred with an increase of pro-inflammatory factors, together with reduced levels of anti-inflammatory factors, transcriptor Nrf-2, and anti-oxidant enzyme HO-1. Administration of an α7-nAChR agonist PHA-543613 induced activation of PI3K/AKT/GSK-3β, and reversed changes in pro-inflammatory and anti-inflammatory factors, Nrf-2 and HO-1. These results suggest that stimulation of α7-nAChR reduce neuroinflammation and oxidative stress after chronic sleep deprivation.
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Affiliation(s)
- Rong Xue
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin, China
| | - Yahui Wan
- Department of Neurology, Tianjin Medical University General Hospital Airport Hospital, Tianjin, China
| | - Xiaoqian Sun
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin, China
| | - Xuan Zhang
- Department of Neurology, Tianjin Medical University General Hospital Airport Hospital, Tianjin, China
| | - Wei Gao
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin, China
| | - Wei Wu
- Department of Neurology, Tianjin Medical University General Hospital, Tianjin, China
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Cholinergic system and exploratory behavior are changed after weekly-binge ethanol exposure in zebrafish. Pharmacol Biochem Behav 2019; 186:172790. [PMID: 31499145 DOI: 10.1016/j.pbb.2019.172790] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 09/04/2019] [Accepted: 09/05/2019] [Indexed: 12/28/2022]
Abstract
Binge drinking is characterized by excessive alcohol consumption in a short period of time and is associated with a poor quality of life. Zebrafish are commonly used to investigate neurochemical, behavioral, and genetic parameters associated with ethanol (EtOH) exposure. However, few studies have used zebrafish as a model to investigate binge EtOH exposure. In order to elucidate the potential neurobehavioral impairments evoked by binge EtOH exposure in zebrafish, animals were immersed in 1.4% EtOH for 30 min three consecutive times with intervals of one week. Neurobehavioral parameters were analyzed immediately following the third exposure, as well as 2 and 9 days later. Brain choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) activities were reduced 9 days after the treatment. Thiobarbituric acid-reactive species and dichlorodihydrofluorescein levels were increased immediately after the treatment, but both returned to normal levels 2 days after the treatment. Catalase and glutathione reductase were impaired 2 and 9 days after the treatment. No alteration was observed in superoxide dismutase and glutathione peroxidase activities. EtOH treatment did not alter brain expression of inflammatory genes such as il-1β, il-10, and tnf-α. Zebrafish displayed anxiolytic-like behavior immediately after the last exposure, though there was no behavioral alteration observed 9 days after the treatment. Therefore, binge EtOH exposure in zebrafish leads to long lasting brain cholinergic alteration, probably related to oxidative stress immediately after the exposure, which is independent of classical inflammatory markers.
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Saand AR, Yu F, Chen J, Chou SHY. Systemic inflammation in hemorrhagic strokes - A novel neurological sign and therapeutic target? J Cereb Blood Flow Metab 2019; 39:959-988. [PMID: 30961425 PMCID: PMC6547186 DOI: 10.1177/0271678x19841443] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Growing evidences suggest that stroke is a systemic disease affecting many organ systems beyond the brain. Stroke-related systemic inflammatory response and immune dysregulations may play an important role in brain injury, recovery, and stroke outcome. The two main phenomena in stroke-related peripheral immune dysregulations are systemic inflammation and post-stroke immunosuppression. There is emerging evidence suggesting that the spleen contracts following ischemic stroke, activates peripheral immune response and this may further potentiate brain injury. Whether similar brain-immune crosstalk occurs in hemorrhagic strokes such as intracerebral hemorrhage (ICH) and subarachnoid hemorrhage (SAH) is not established. In this review, we systematically examined animal and human evidence to date on peripheral immune responses associated with hemorrhagic strokes. Specifically, we reviewed the impact of clinical systemic inflammatory response syndrome (SIRS), inflammation- and immune-associated biomarkers, the brain-spleen interaction, and cellular mediators of peripheral immune responses to ICH and SAH including regulatory T cells (Tregs). While there is growing data suggesting that peripheral immune dysregulation following hemorrhagic strokes may be important in brain injury pathogenesis and outcome, details of this brain-immune system cross-talk remain insufficiently understood. This is an important unmet scientific need that may lead to novel therapeutic strategies in this highly morbid condition.
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Affiliation(s)
- Aisha R Saand
- 1 Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Fang Yu
- 2 Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Jun Chen
- 2 Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sherry H-Y Chou
- 1 Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,2 Department of Neurology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,3 Department of Neurosurgery, School of Medicine, University of Pittsburgh, PA, USA
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46
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Cao M, MacDonald JW, Liu HL, Weaver M, Cortes M, Durosier LD, Burns P, Fecteau G, Desrochers A, Schulkin J, Antonelli MC, Bernier RA, Dorschner M, Bammler TK, Frasch MG. α7 Nicotinic Acetylcholine Receptor Signaling Modulates Ovine Fetal Brain Astrocytes Transcriptome in Response to Endotoxin. Front Immunol 2019; 10:1063. [PMID: 31143190 PMCID: PMC6520997 DOI: 10.3389/fimmu.2019.01063] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 04/25/2019] [Indexed: 11/13/2022] Open
Abstract
Neuroinflammation in utero may result in lifelong neurological disabilities. Astrocytes play a pivotal role in this process, but the mechanisms are poorly understood. No early postnatal treatment strategies exist to enhance neuroprotective potential of astrocytes. We hypothesized that agonism on α7 nicotinic acetylcholine receptor (α7nAChR) in fetal astrocytes will augment their neuroprotective transcriptome profile, while the inhibition of α7nAChR will achieve the opposite. Using an in vivo–in vitro model of developmental programming of neuroinflammation induced by lipopolysaccharide (LPS), we validated this hypothesis in primary fetal sheep astrocytes cultures re-exposed to LPS in the presence of a selective α7nAChR agonist or antagonist. Our RNAseq findings show that a pro-inflammatory astrocyte transcriptome phenotype acquired in vitro by LPS stimulation is reversed with α7nAChR agonistic stimulation. Conversely, α7nAChR inhibition potentiates the pro-inflammatory astrocytic transcriptome phenotype. Furthermore, we conducted a secondary transcriptome analysis against the identical α7nAChR experiments in fetal sheep primary microglia cultures. Similar to findings in fetal microglia, in fetal astrocytes we observed a memory effect of in vivo exposure to inflammation, expressed in a perturbation of the iron homeostasis signaling pathway (hemoxygenase 1, HMOX1), which persisted under pre-treatment with α7nAChR antagonist but was reversed with α7nAChR agonist. For both glia cell types, common pathways activated due to LPS included neuroinflammation signaling and NF-κB signaling in some, but not all comparisons. However, overall, the overlap on the level of signaling pathways was rather minimal. Astrocytes, not microglia—the primary immune cells of the brain, were characterized by unique inhibition patterns of STAT3 pathway due to agonistic stimulation of α7nAChR prior to LPS exposure. Lastly, we discuss the implications of our findings for fetal and postnatal brain development.
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Affiliation(s)
- Mingju Cao
- Department of Obstetrics and Gynaecology and Department of Neurosciences, CHU Ste-Justine Research Centre, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - James W MacDonald
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, United States
| | - Hai L Liu
- Department of Obstetrics and Gynaecology and Department of Neurosciences, CHU Ste-Justine Research Centre, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Molly Weaver
- UW Medicine Center for Precision Diagnostics, University of Washington, Seattle, WA, United States
| | - Marina Cortes
- Animal Reproduction Research Centre (CRRA), Faculty of Veterinary Medicine, Université de Montréal, Montréal, QC, Canada
| | - Lucien D Durosier
- Department of Obstetrics and Gynaecology and Department of Neurosciences, CHU Ste-Justine Research Centre, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Patrick Burns
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Montréal, QC, Canada
| | - Gilles Fecteau
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Montréal, QC, Canada
| | - André Desrochers
- Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Montréal, QC, Canada
| | - Jay Schulkin
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Marta C Antonelli
- Instituto de Biología Celular y Neurociencia "Prof. Eduardo De Robertis", Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Raphael A Bernier
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA, United States
| | - Michael Dorschner
- UW Medicine Center for Precision Diagnostics, University of Washington, Seattle, WA, United States
| | - Theo K Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, United States
| | - Martin G Frasch
- Department of Obstetrics and Gynaecology and Department of Neurosciences, CHU Ste-Justine Research Centre, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada.,Animal Reproduction Research Centre (CRRA), Faculty of Veterinary Medicine, Université de Montréal, Montréal, QC, Canada.,Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States.,Center on Human Development and Disability, University of Washington, Seattle, WA, United States
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47
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Ji L, Chen Y, Wei H, Feng H, Chang R, Yu D, Wang X, Gong X, Zhang M. Activation of alpha7 acetylcholine receptors reduces neuropathic pain by decreasing dynorphin A release from microglia. Brain Res 2019; 1715:57-65. [PMID: 30898676 DOI: 10.1016/j.brainres.2019.03.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 01/09/2019] [Accepted: 03/16/2019] [Indexed: 12/17/2022]
Abstract
Dynorphin A is increased in neuropathic pain models. Activation of α7 n acetylcholine receptor (nAchR) reduces inflammation and pain. Whether activation of α7 nAchR affects dynorphin A release is unknown. The experiments evaluated the proinflammatory effect of dynorphin A in the spinal nerve ligation-induced neuropathic pain models and the effect of α7 nAchR activation on the dynorphin A content. α7 nAchR agonist, PHA-543613 and its antagonist, methyllycaconitine citrate were used and dynorphin A content was measured after spinal nerve ligation and in microglia cultures to test the analgesic mechanisms of α7 nAchR activation. The results showed that dynorphin A content peaked 3 to 7 days after nerve injury, and dynorphin A anti-serum intrathecal injection decreased IL-β and TNF-α content a week after nerve injury. Activation of α7 nAchR by PHA-543613 alleviated neuropathic pain behaviors and decreased dynorphin A concentration in the ipsilateral spinal cords. Also, PHA-543613 decreased dynorphin A release from the microglia cultures to LPS stimulation by activation of α7 nAchR. Our results suggest that dynorphin A contribute to the development and maintenance of neuropathic pain and that decreasing dynorphin A content by activation of α7 AchR of microglia is a potential therapeutic target for treating neuropathic pain.
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Affiliation(s)
- Liu Ji
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China
| | - Yongmei Chen
- Department of Laboratory, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China
| | - Huixia Wei
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China
| | - Hui Feng
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China
| | - Ruijie Chang
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China
| | - Di Yu
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China
| | - Xianyu Wang
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China.
| | - Xingrui Gong
- Department of Anesthesiology, Shiyan Taihe Hospital, Affiliated Hospital of Hubei University of Medicine, Hubei, Shiyan, China; Institute of Anesthesiology, Department of Anesthesiology, Hubei University of Medicine, Hubei, Shiyan, China; Department of Anesthesiology and Pediatric Clinical Pharmacology Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Mazhong Zhang
- Department of Anesthesiology and Pediatric Clinical Pharmacology Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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48
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Liu R, Liao XY, Pan MX, Tang JC, Chen SF, Zhang Y, Lu PX, Lu LJ, Zou YY, Qin XP, Bu LH, Wan Q. Glycine Exhibits Neuroprotective Effects in Ischemic Stroke in Rats through the Inhibition of M1 Microglial Polarization via the NF-κB p65/Hif-1α Signaling Pathway. THE JOURNAL OF IMMUNOLOGY 2019; 202:1704-1714. [DOI: 10.4049/jimmunol.1801166] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 01/02/2019] [Indexed: 01/24/2023]
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49
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Wong R, Lénárt N, Hill L, Toms L, Coutts G, Martinecz B, Császár E, Nyiri G, Papaemmanouil A, Waisman A, Müller W, Schwaninger M, Rothwell N, Francis S, Pinteaux E, Denés A, Allan SM. Interleukin-1 mediates ischaemic brain injury via distinct actions on endothelial cells and cholinergic neurons. Brain Behav Immun 2019; 76:126-138. [PMID: 30453020 PMCID: PMC6363965 DOI: 10.1016/j.bbi.2018.11.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 11/12/2018] [Accepted: 11/15/2018] [Indexed: 12/17/2022] Open
Abstract
The cytokine interleukin-1 (IL-1) is a key contributor to neuroinflammation and brain injury, yet mechanisms by which IL-1 triggers neuronal injury remain unknown. Here we induced conditional deletion of IL-1R1 in brain endothelial cells, neurons and blood cells to assess site-specific IL-1 actions in a model of cerebral ischaemia in mice. Tamoxifen treatment of IL-1R1 floxed (fl/fl) mice crossed with mice expressing tamoxifen-inducible Cre-recombinase under the Slco1c1 promoter resulted in brain endothelium-specific deletion of IL-1R1 and a significant decrease in infarct size (29%), blood-brain barrier (BBB) breakdown (53%) and neurological deficit (40%) compared to vehicle-treated or control (IL-1R1fl/fl) mice. Absence of brain endothelial IL-1 signalling improved cerebral blood flow, followed by reduced neutrophil infiltration and vascular activation 24 h after brain injury. Conditional IL-1R1 deletion in neurons using tamoxifen inducible nestin-Cre mice resulted in reduced neuronal injury (25%) and altered microglia-neuron interactions, without affecting cerebral perfusion or vascular activation. Deletion of IL-1R1 specifically in cholinergic neurons reduced infarct size, brain oedema and improved functional outcome. Ubiquitous deletion of IL-1R1 had no effect on brain injury, suggesting beneficial compensatory mechanisms on other cells against the detrimental effects of IL-1 on endothelial cells and neurons. We also show that IL-1R1 signalling deletion in platelets or myeloid cells does not contribute to brain injury after experimental stroke. Thus, brain endothelial and neuronal (cholinergic) IL-1R1 mediate detrimental actions of IL-1 in the brain in ischaemic stroke. Cell-specific targeting of IL-1R1 in the brain could therefore have therapeutic benefits in stroke and other cerebrovascular diseases.
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Affiliation(s)
- Raymond Wong
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Nikolett Lénárt
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Laura Hill
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Lauren Toms
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Graham Coutts
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Bernadett Martinecz
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Eszter Császár
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Gábor Nyiri
- Laboratory of Cerebral Cortex Research, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary
| | - Athina Papaemmanouil
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Ari Waisman
- Institute for Molecular Medicine, University Medical Center of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
| | - Werner Müller
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Markus Schwaninger
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, 23538 Lübeck, Germany
| | - Nancy Rothwell
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Sheila Francis
- Department of Infection, Immunity & Cardiovascular Disease, Medical School, University of Sheffield, S10 2RX Sheffield, UK
| | - Emmanuel Pinteaux
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK
| | - Adam Denés
- "Momentum" Laboratory of Neuroimmunology, Institute of Experimental Medicine, Szigony u. 43, 1083 Budapest, Hungary.
| | - Stuart M Allan
- Faculty of Biology, Medicine and Health, University of Manchester, M13 9PT Manchester, UK.
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50
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Ma L, Niu W, Lv J, Jia J, Zhu M, Yang S. PGC-1α-Mediated Mitochondrial Biogenesis is Involved in Cannabinoid Receptor 2 Agonist AM1241-Induced Microglial Phenotype Amelioration. Cell Mol Neurobiol 2018; 38:1529-1537. [PMID: 30315387 DOI: 10.1007/s10571-018-0628-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Accepted: 10/08/2018] [Indexed: 12/16/2022]
Abstract
Cannabinoid type 2 receptor (CB2R) agonist AM1241 induces anti-inflammation by ameliorating microglial phenotypes, the mechanism, however, is still unknown. Peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α) is a transcription protein which can regulate mitochondrial biogenesis, and the aim of this study is to investigate whether PGC-1α is involved in AM1241-induced anti-inflammation in N9 microglial cells. We used 10 ng/ml lipopolysaccharide (LPS) plus 10 U/ml interferon γ (IFNγ) to activate microglia into classic activated phenotype (M1 phenotype), and found that co-administration of 10 µM AM1241 increased the expressions of mitochondria biogenesis-associated proteins, including nuclear respiratory factor 1 (NRF-1), mitochondrial transcription factor A (TFAM) and COX IV, and up-regulated the biomarker levels of microglial M2 phenotype, including arginase 1 (Arg-1) and brain-derived neurotrophic factor (BDNF), and down-regulated biomarker levels of M1 phenotype, including inducible nitric oxide synthase (iNOS) and tumor necrosis factor α (TNF-α), compared to the cells treated with LPS plus IFNγ only (P < 0.05). By using PGC-1α-siRNA, however, we found that down-regulation of PGC-1α significantly reversed the AM1241-induced effects above (P < 0.05). According to the results in this study, we found that PGC-1α may mediate CB2R agonist AM1241-induced anti-inflammation in N9 microglial cells, and the mechanism might be associated with the enhancement of mitochondria biogenesis.
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Affiliation(s)
- Lei Ma
- Department of Physiology and Pathophysiology, The Fourth Military Medical University, Xi'an, 710032, China
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, China
| | - Wen Niu
- Department of Physiology and Pathophysiology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Jianrui Lv
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, China
| | - Ji Jia
- Department of Anesthesiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, China
| | - Miaozhang Zhu
- Department of Physiology and Pathophysiology, The Fourth Military Medical University, Xi'an, 710032, China.
| | - Shuai Yang
- Department of Neurosurgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China.
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