51
|
Ossola CA, Balcarcel NB, Astrauskas JI, Bozzini C, Elverdin JC, Fernández‐Solari J. A new target to ameliorate the damage of periodontal disease: The role of transient receptor potential vanilloid type‐1 in contrast to that of specific cannabinoid receptors in rats. J Periodontol 2019; 90:1325-1335. [DOI: 10.1002/jper.18-0766] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 04/29/2019] [Accepted: 05/06/2019] [Indexed: 01/01/2023]
Affiliation(s)
- César A. Ossola
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
- National Council of Scientific and Technical Research (CONICET) Buenos Aires Argentina
| | - Noelia B. Balcarcel
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
| | - Julia I. Astrauskas
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
| | - Clarisa Bozzini
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
| | - Juan C. Elverdin
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
| | - Javier Fernández‐Solari
- Department of PhysiologyFaculty of DentistryUniversity of Buenos Aires Buenos Aires Argentina
- National Council of Scientific and Technical Research (CONICET) Buenos Aires Argentina
| |
Collapse
|
52
|
Choi EM, Suh KS, Park SY, Chin SO, Rhee SY, Chon S. Biochanin A prevents 2,3,7,8-tetrachlorodibenzo-p-dioxin-induced adipocyte dysfunction in cultured 3T3-L1 cells. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2019; 54:865-873. [PMID: 31007129 DOI: 10.1080/10934529.2019.1603746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 03/25/2019] [Accepted: 03/25/2019] [Indexed: 06/09/2023]
Abstract
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is a persistent environmental pollutant. TCDD accumulates in the food chain, mainly in the fatty tissues of the human body where it causes various toxic effects. Biochanin A is a natural organic compound in the class of phytochemicals known as flavonoids. We investigated whether biochanin A suppresses TCDD-induced loss of adipogenic action using 3T3-L1 adipocytes as a cell culture model of wasting syndrome. In the present study, biochanin A suppressed TCDD-induced loss of lipid accumulation. Pretreating the cells with biochanin A increased the levels of the adipogenesis-associated factors peroxisome proliferator-activated receptor γ and adiponectin, which were inhibited by TCDD. TCDD decreased insulin-stimulated glucose uptake, which was effectively restored by pretreatment with biochanin A. Biochanin A also inhibited the TCDD-driven decrease in production of insulin receptor substrate-1 and glucose transporter 4. These results suggest a preventive effect of biochanin A against TCDD in the development of insulin resistance and diabetes. TCDD increased production of intracellular calcium ([Ca2+]i), prostaglandin E2, cytosolic phospholipase A2, and cyclooxygenase-1, while reducing the level of peroxisome proliferator-activated receptor gamma coactivator 1-alpha. However, biochanin A inhibited these TCDD-induced effects. We conclude that biochanin A is an attractive compound for preventing TCDD-induced wasting syndrome.
Collapse
Affiliation(s)
- Eun Mi Choi
- a Department of Endocrinology & Metabolism, School of Medicine , Kyung Hee University , Seoul , Republic of Korea
| | - Kwang Sik Suh
- a Department of Endocrinology & Metabolism, School of Medicine , Kyung Hee University , Seoul , Republic of Korea
| | - So Young Park
- b Department of Medicine, Graduate School , Kyung Hee University , Seoul , Republic of Korea
- c Department of Endocrinology & Metabolism , Kyung Hee University Hospital , Seoul , Republic of Korea
| | - Sang Ouk Chin
- a Department of Endocrinology & Metabolism, School of Medicine , Kyung Hee University , Seoul , Republic of Korea
- c Department of Endocrinology & Metabolism , Kyung Hee University Hospital , Seoul , Republic of Korea
| | - Sang Youl Rhee
- a Department of Endocrinology & Metabolism, School of Medicine , Kyung Hee University , Seoul , Republic of Korea
- c Department of Endocrinology & Metabolism , Kyung Hee University Hospital , Seoul , Republic of Korea
| | - Suk Chon
- a Department of Endocrinology & Metabolism, School of Medicine , Kyung Hee University , Seoul , Republic of Korea
- c Department of Endocrinology & Metabolism , Kyung Hee University Hospital , Seoul , Republic of Korea
| |
Collapse
|
53
|
Healthy Brain Aging Modifies Microglial Calcium Signaling In Vivo. Int J Mol Sci 2019; 20:ijms20030589. [PMID: 30704036 PMCID: PMC6386999 DOI: 10.3390/ijms20030589] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/11/2019] [Accepted: 01/24/2019] [Indexed: 12/22/2022] Open
Abstract
Brain aging is characterized by a chronic, low-grade inflammatory state, promoting deficits in cognition and the development of age-related neurodegenerative diseases. Malfunction of microglia, the brain-resident immune cells, was suggested to play a critical role in neuroinflammation, but the mechanisms underlying this malfunctional phenotype remain unclear. Specifically, the age-related changes in microglial Ca2+ signaling, known to be linked to its executive functions, are not well understood. Here, using in vivo two-photon imaging, we characterize intracellular Ca2+ signaling and process extension of cortical microglia in young adult (2–4-month-old), middle-aged (9–11-month-old), and old (18–21-month-old) mice. Our data revealed a complex and nonlinear dependency of the properties of intracellular Ca2+ signals on an animal’s age. While the fraction of cells displaying spontaneous Ca2+ transients progressively increased with age, the frequencies and durations of the spontaneous Ca2+ transients followed a bell-shaped relationship, with the most frequent and largest Ca2+ transients seen in middle-aged mice. Moreover, in old mice microglial processes extending toward an ATP source moved faster but in a more disorganized manner, compared to young adult mice. Altogether, these findings identify two distinct phenotypes of aging microglia: a reactive phenotype, abundantly present in middle-aged animals, and a dysfunctional/senescent phenotype ubiquitous in old mice.
Collapse
|
54
|
Brawek B, Garaschuk O. Single-Cell Electroporation for Measuring In Vivo Calcium Dynamics in Microglia. Methods Mol Biol 2019; 2034:231-241. [PMID: 31392689 DOI: 10.1007/978-1-4939-9658-2_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Similar to many nonexcitable cells, microglia utilize intracellular Ca2+ signaling for the communication with each other as well as neurons and astrocytes and for triggering a magnitude of their executive functions. However, in vivo measurements of the intracellular Ca2+ dynamics in microglia have been challenging due to technical reasons. Here, we describe an approach utilizing a single-cell electroporation technique to facilitate the study of microglial Ca2+ signaling in the living brain.
Collapse
Affiliation(s)
- Bianca Brawek
- Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Olga Garaschuk
- Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany.
| |
Collapse
|
55
|
Abstract
Genetically encoded calcium indicators (GECIs) have become widely used for Ca2+ imaging in cultured cells as well as in living organisms. Transduction of microglia with viral vectors encoding GECIs provides a convenient means to label microglia for in vivo Ca2+ imaging. We describe a method using microglia-specific microRNA-9-regulated viral vector, to label microglial cells with a ratiometric GECI (Twitch-2B). This method enables longitudinal recording of both transient and sustained elevations of Ca2+ in microglia in live animals.
Collapse
Affiliation(s)
- Yajie Liang
- Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany
| | - Olga Garaschuk
- Department of Neurophysiology, Institute of Physiology, Eberhard Karls University of Tübingen, Tübingen, Germany.
| |
Collapse
|
56
|
The role of convergent ion channel pathways in microglial phenotypes: a systematic review of the implications for neurological and psychiatric disorders. Transl Psychiatry 2018; 8:259. [PMID: 30498192 PMCID: PMC6265266 DOI: 10.1038/s41398-018-0318-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 10/12/2018] [Accepted: 11/13/2018] [Indexed: 02/07/2023] Open
Abstract
Increases in the activated state of microglia, the main neuroimmune cells, are widely reported in the brains of patients with neurological and psychiatric disorders. Microglia transform from the resting to the activated state by sensing their environment, aided by a variety of ion channels. To examine the effect of ion channels on microglial phenotypes, we conducted a systematic review of immunohistochemical analyses of these neuroimmune cells in animal models following administration of ion channel antagonists, compared to control conditions. A systematic search of the PubMed and Web of Science electronic databases using the PRISMA and WHO methodologies for systematic reviews yielded 15 original peer-reviewed studies. The majority (13 out of 15) of these studies reported a decrease in microglial activated state after ion signaling pharmacological blockade. The studies provide evidence that acute administration of ion channel antagonists leads to a reduction in microglial activation in rodent brains in the models for epilepsy, Parkinson's disease, inflammation, pain, ischemia, and brain and spinal cord injury. Future research should explore microglial-specific druggable targets for neurological and psychiatric disorders. The investigation of acute and chronic administration of ion channel antagonists in microglial phenotypes in primates and the development of microglia-like cells derived from human stem cells could be valuable sources in this direction.
Collapse
|
57
|
Huang CT, Chen SH, Lin SC, Chen WT, Lue JH, Tsai YJ. Erythropoietin reduces nerve demyelination, neuropathic pain behavior and microglial MAPKs activation through erythropoietin receptors on Schwann cells in a rat model of peripheral neuropathy. Glia 2018; 66:2299-2315. [PMID: 30417431 DOI: 10.1002/glia.23461] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 04/15/2018] [Accepted: 05/08/2018] [Indexed: 12/21/2022]
Abstract
Neuroprotective effects of erythropoietin (EPO) on peripheral nerve injury remain uncertain. This study investigated the efficacy of EPO in attenuating median nerve chronic constriction injury (CCI)-induced neuropathy. Animals received an intraneural injection of EPO at doses of 1,000, 3,000, or 5,000 units/kg 15 min before median nerve CCI. Afterwards, the behavioral and electrophysiological tests were conducted. Immunohistochemistry and immunoblotting were used for qualitative and quantitative analysis of microglial and mitogen-activated protein kinases (MAPKs), including p38, JNK, and ERK, activation. Enzyme-linked immunosorbent assay and microdialysis were applied to measure pro-inflammatory cytokine and glutamate responses, respectively. EPO pre-treatment dose-dependently ameliorated neuropathic pain behavior, decreased microglial and MAPKs activation, and diminished the release of pro-inflammatory cytokines and glutamate in the ipsilateral cuneate nucleus after CCI. Moreover, EPO pre-treatment preserved myelination of the injured median nerve on morphological investigation and suppressed injury-induced discharges. We also observed that EPO receptor (EPOR) expression was up-regulated in the injured nerve after CCI. Double immunofluorescence showed that EPOR was localized to Schwann cells. Furthermore, siRNA-mediated knockdown of EPOR expression eliminated the therapeutic effects of EPO on attenuating the microglial and MAPKs activation, pro-inflammatory cytokine responses, injury discharges, and neuropathic pain behavior in CCI rats. In conclusion, binding of EPO to its receptors on Schwann cells maintains myelin integrity and blocks ectopic discharges in the injured median nerve, that in the end contribute to attenuation of neuropathic pain via reducing glutamate release from primary afferents and inhibiting activation of microglial MAPKs and production of pro-inflammatory cytokines.
Collapse
Affiliation(s)
- Chun-Ta Huang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Seu-Hwa Chen
- Department of Anatomy, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Shih-Chang Lin
- Division of Allergy and Immunology, Department of Internal Medicine, Cathay General Hospital, Taipei, Taiwan
| | - Wei-Ting Chen
- Department of Anesthesiology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan.,Graduate Institute of Biomedical and Pharmaceutical Science, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - June-Horng Lue
- Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Ju Tsai
- Graduate Institute of Biomedical and Pharmaceutical Science, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| |
Collapse
|
58
|
Tan Q, Zhang M, Geng L, Xia Z, Li C, Usman M, Du Y, Wei L, Bi H. Hormesis of methylmercury-human serum albumin conjugate on N9 microglia via ERK/MAPKs and STAT3 signaling pathways. Toxicol Appl Pharmacol 2018; 362:59-66. [PMID: 30352208 DOI: 10.1016/j.taap.2018.10.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 09/18/2018] [Accepted: 10/19/2018] [Indexed: 10/28/2022]
Abstract
Methylmercury (MeHg+) is an extremely toxic organomercury cation that can induce severe neurological damage. Once it enters the body, methylmercury binds to amino acids or proteins containing free sulfhydryl groups. In particular, methylmercury is known to bind with human serum albumin (HSA) in human plasma; however, the effects of methylmercury-HSA conjugate (MeHg-HSA) on the central nervous system (CNS) are not fully understood. In the present study, we used the microglial cell line N9 as the target cells to evaluate the effect of MeHg-HSA on physiological function of the CNS preliminarily. The various factors in the cell culture were monitored by MTT assay, total lactate dehydrogenase assay, ELISA, qPCR, Western blot and flow cytometry techniques. The results showed that low-dose treatment with MeHg-HSA activated N9 cells, promoting cell proliferation and total cell number, enhancing NO and intracellular Ca2+ levels, and suppressing the release of TNFα and IL1β without cytotoxic effects; while high-dose MeHg-HSA exhibited cytotoxic effects on N9 cells, including promoting cell death and increasing the secretion of TNFα and IL1β. These results indicate that MeHg-HSA causes hormesis in microglia N9 cells. Furthermore, ERK/MAPKs and STAT3 signaling pathways related to the hormesis of MeHg-HSA on N9 cells. In addition, low dose of MeHg-HSA might be viewed as something very close to a lowest observed adverse effect level (LOAEL) for N9 cells. These findings will be useful for investigating the hormesis mechanism of MeHg+ and exploring the specific functions of MeHg-sulfhydryl conjugates on the central nervous system.
Collapse
Affiliation(s)
- Qiaozhu Tan
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; University of Chinese Academy of Sciences, Beijing, China
| | - Ming Zhang
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; University of Chinese Academy of Sciences, Beijing, China
| | - Lujing Geng
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; University of Chinese Academy of Sciences, Beijing, China
| | - Zhenghua Xia
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; University of Chinese Academy of Sciences, Beijing, China
| | - Cen Li
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Muhammad Usman
- Department of Biotechnology, Virtual University of Pakistan, Lahore, Pakistan
| | - Yuzhi Du
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China
| | - Lixin Wei
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.
| | - Hongtao Bi
- Qinghai Provincial Key Laboratory of Tibetan Medicine Pharmacology and Safety Evaluation, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China; Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.
| |
Collapse
|
59
|
Mustaly-Kalimi S, Littlefield AM, Stutzmann GE. Calcium Signaling Deficits in Glia and Autophagic Pathways Contributing to Neurodegenerative Disease. Antioxid Redox Signal 2018; 29:1158-1175. [PMID: 29634342 DOI: 10.1089/ars.2017.7266] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
SIGNIFICANCE Numerous cellular processes and signaling mechanisms have been identified that contribute to Alzheimer's disease (AD) pathology; however, a comprehensive or unifying pathway that binds together the major disease features remains elusive. As an upstream mechanism, altered calcium (Ca2+) signaling is a common driving force for many pathophysiological events that emerge during normal aging and development of neurodegenerative disease. Recent Advances: Over the previous three decades, accumulated evidence has validated the concept that intracellular Ca2+ dysregulation is centrally involved in AD pathogenesis, including the aggregation of pathogenic β-amyloid (Aβ) and phospho-τ species, synapse loss and dysfunction, cognitive impairment, and neurotoxicity. CRITICAL ISSUES Although neuronal Ca2+ signaling within the cytosol and endoplasmic reticulum (ER) has been well studied, other critical central nervous system-resident cell types affected by aberrant Ca2+ signaling, such as astrocytes and microglia, have not been considered as thoroughly. In addition, certain intracellular Ca2+-harboring organelles have been well studied, such as the ER and mitochondria; however other critical Ca2+-regulated organelles, such as lysosomes and autophagosomes, have only more recently been investigated. In this review, we examine Ca2+ dysregulation in microglia and astrocytes, as well as key intracellular organelles important for cellular maintenance and protein handling. Ca2+ dysregulation within these non-neuronal cells and organelles is hypothesized to disrupt the effective clearance of misaggregated proteins and cellular signaling pathways needed for memory networks. FUTURE DIRECTIONS Overall, we aim to explore how these disrupted mechanisms could be involved in AD pathology and consider their role as potential therapeutic targets. Antioxid. Redox Signal. 29, 1158-1175.
Collapse
Affiliation(s)
- Sarah Mustaly-Kalimi
- 1 Department of Neuroscience, School of Graduate and Postdoctoral Studies, Rosalind Franklin University of Medicine and Science , North Chicago, Illinois
| | - Alyssa M Littlefield
- 1 Department of Neuroscience, School of Graduate and Postdoctoral Studies, Rosalind Franklin University of Medicine and Science , North Chicago, Illinois
| | - Grace E Stutzmann
- 2 Department of Neuroscience, The Chicago Medical School, Rosalind Franklin University of Medicine and Science , North Chicago, Illinois
| |
Collapse
|
60
|
Liang H, Chen A, Lai X, Liu J, Wu J, Kang Y, Wang X, Shao L. Neuroinflammation is induced by tongue-instilled ZnO nanoparticles via the Ca 2+-dependent NF-κB and MAPK pathways. Part Fibre Toxicol 2018; 15:39. [PMID: 30340606 PMCID: PMC6194560 DOI: 10.1186/s12989-018-0274-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 09/05/2018] [Indexed: 12/29/2022] Open
Abstract
Background The extensive biological applications of zinc oxide nanoparticles (ZnO NPs) in stomatology have created serious concerns about their biotoxicity. In our previous study, ZnO NPs were confirmed to transfer to the central nervous system (CNS) via the taste nerve pathway and cause neurodegeneration after 30 days of tongue instillation. However, the potential adverse effects on the brain caused by tongue-instilled ZnO NPs are not fully known. Methods In this study, the biodistribution of Zn, cerebral histopathology and inflammatory responses were analysed after 30 days of ZnO NPs tongue instillation. Moreover, the molecular mechanisms underlying neuroinflammation in vivo were further elucidated by treating BV2 and PC12 cells with ZnO NPs in vitro. Results This analysis indicated that ZnO NPs can transfer into the CNS, activate glial cells and cause neuroinflammation after tongue instillation. Furthermore, exposure to ZnO NPs led to a reduction in cell viability and induction of inflammatory response and calcium influx in BV2 and PC12 cells. The mechanism underlying how ZnO NPs induce neuroinflammation via the Ca2+-dependent NF-κB, ERK and p38 activation pathways was verified at the cytological level. Conclusion This study provided a new way how NPs, such as ZnO NPs, induce neuroinflammation via the taste nerve translocation pathway, a new mechanism for ZnO NPs-induced neuroinflammation and a new direction for nanomaterial toxicity analysis. Electronic supplementary material The online version of this article (10.1186/s12989-018-0274-0) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Huimin Liang
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China.,Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Guangzhou, 510515, China
| | - Aijie Chen
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Xuan Lai
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Jia Liu
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Junrong Wu
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Yiyuan Kang
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Xinying Wang
- Zhujiang Hospital of Southern Medical University, Guangzhou, 510515, China
| | - Longquan Shao
- Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China. .,Guangdong Provincial Key Laboratory of Construction and Detection in Tissue Engineering, Guangzhou, 510515, China.
| |
Collapse
|
61
|
Exploring Pharmacological Mechanisms of Xuefu Zhuyu Decoction in the Treatment of Traumatic Brain Injury via a Network Pharmacology Approach. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 2018:8916938. [PMID: 30402137 PMCID: PMC6193325 DOI: 10.1155/2018/8916938] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 09/17/2018] [Indexed: 12/21/2022]
Abstract
Objectives Xuefu Zhuyu decoction (XFZYD), a traditional Chinese medicine (TCM) formula, has been demonstrated to be effective for the treatment of traumatic brain injury (TBI). However, the underlying pharmacological mechanisms remain unclear. This study aims to explore the potential action mechanisms of XFZYD in the treatment of TBI and to elucidate the combination principle of this herbal formula. Methods A network pharmacology approach including ADME (absorption, distribution, metabolism, and excretion) evaluation, target prediction, known therapeutic targets collection, network construction, and molecule docking was used in this study. Results A total of 119 bioactive ingredients from XFZYD were predicted to act on 47 TBI associated specific proteins which intervened in several crucial pathological processes including apoptosis, inflammation, antioxidant, and axon genesis. Almost each of the bioactive ingredients targeted more than one protein. The molecular docking simulation showed that 91 pairs of chemical components and candidate targets had strong binding efficiencies. The “Jun”, “Chen”, and “Zuo-Shi” herbs from XFZYD triggered their specific targets regulation, respectively. Conclusion Our work successfully illuminates the “multicompounds, multitargets” therapeutic action of XFZYD in the treatment of TBI by network pharmacology with molecule docking method. The present work may provide valuable evidence for further clinical application of XFZYD as therapeutic strategy for TBI treatment.
Collapse
|
62
|
Tan Q, Liu Z, Li H, Liu Y, Xia Z, Xiao Y, Usman M, Du Y, Bi H, Wei L. Hormesis of mercuric chloride-human serum albumin adduct on N9 microglial cells via the ERK/MAPKs and JAK/STAT3 signaling pathways. Toxicology 2018; 408:62-69. [DOI: 10.1016/j.tox.2018.07.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/07/2018] [Accepted: 07/03/2018] [Indexed: 12/22/2022]
|
63
|
Suh KS, Choi EM, Kim HS, Park SY, Chin SO, Rhee SY, Pak YK, Choe W, Ha J, Chon S. Xanthohumol ameliorates 2,3,7,8-tetrachlorodibenzo-p-dioxin-induced cellular toxicity in cultured MC3T3-E1 osteoblastic cells. J Appl Toxicol 2018. [DOI: 10.1002/jat.3613] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Kwang Sik Suh
- Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
| | - Eun Mi Choi
- Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
| | - Hyun-Sook Kim
- Department of Biomedical Laboratory Science, College of Health Sciences; Cheongju University; Cheongju Chungbuk 360-764 Republic of Korea
| | - So Young Park
- Department of Medicine, Graduate School; Kyung Hee University; Seoul 130-702 Republic of Korea
| | - Sang Ouk Chin
- Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
| | - Sang Youl Rhee
- Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
| | - Youngmi Kim Pak
- Department of Physiology; Kyung Hee University, College of Medicine; Seoul 130-701 Republic of Korea
| | - Wonchae Choe
- Department of Biochemistry and Molecular Biology; Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Kyung Hee University; Seoul 130-701 Republic of Korea
| | - Joohun Ha
- Department of Biochemistry and Molecular Biology; Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Kyung Hee University; Seoul 130-701 Republic of Korea
| | - Suk Chon
- Department of Endocrinology & Metabolism, School of Medicine; Kyung Hee University; Seoul 130-702 Republic of Korea
| |
Collapse
|
64
|
Tvrdik P, Kalani MYS. In Vivo Imaging of Microglial Calcium Signaling in Brain Inflammation and Injury. Int J Mol Sci 2017; 18:ijms18112366. [PMID: 29117112 PMCID: PMC5713335 DOI: 10.3390/ijms18112366] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 11/01/2017] [Accepted: 11/04/2017] [Indexed: 12/20/2022] Open
Abstract
Microglia, the innate immune sentinels of the central nervous system, are the most dynamic cells in the brain parenchyma. They are the first responders to insult and mediate neuroinflammation. Following cellular damage, microglia extend their processes towards the lesion, modify their morphology, release cytokines and other mediators, and eventually migrate towards the damaged area and remove cellular debris by phagocytosis. Intracellular Ca2+ signaling plays important roles in many of these functions. However, Ca2+ in microglia has not been systematically studied in vivo. Here we review recent findings using genetically encoded Ca2+ indicators and two-photon imaging, which have enabled new insights into Ca2+ dynamics and signaling pathways in large populations of microglia in vivo. These new approaches will help to evaluate pre-clinical interventions and immunomodulation for pathological brain conditions such as stroke and neurodegenerative diseases.
Collapse
Affiliation(s)
- Petr Tvrdik
- Department of Neurosurgery, University of Utah School of Medicine, Salt Lake City, UT 84132, USA.
| | - M Yashar S Kalani
- Department of Neurosurgery, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
| |
Collapse
|
65
|
Xie N, Wu C, Wang C, Cheng X, Zhang L, Zhang H, Lian Y. Inhibition of the mitochondrial calcium uniporter inhibits Aβ-induced apoptosis by reducing reactive oxygen species-mediated endoplasmic reticulum stress in cultured microglia. Brain Res 2017; 1676:100-106. [PMID: 28939404 DOI: 10.1016/j.brainres.2017.08.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 08/11/2017] [Accepted: 08/23/2017] [Indexed: 11/19/2022]
Abstract
Amyloid-beta (Aβ) has been shown to induce microglial apoptosis, which is itself sensitive to disturbed mitochondrial calcium (Ca2+) homeostasis. The mitochondrial calcium uniporter (MCU) plays an important regulatory role in mitochondrial Ca2+ homeostasis, but its role in Aβ-induced microglia apoptosis is unknown. In this study, we found increased mitochondrial Ca2+ concentration in Aβ-treated primary microglia and BV-2 cells; also, the MCU inhibitor Ru360 significantly attenuated Aβ-induced microglial apoptosis, whereas the MCU activator spermine augmented it. In addition, Ru360 significantly attenuated Aβ-induced mitochondrial reactive oxygen species (ROS) production, as well as endoplasmic reticulum (ER) stress characterized by glucose-regulated protein 78 (GRP78) and C/-EBP homologous protein (CHOP) expression. Spermine, however, exerted the opposite effects on mitochondrial ROS production and ER stress. We also found that mitochondria-targeted antioxidant (Mito-TEMPO) treatment decreased GRP78 and CHOP expression in Aβ-treated microglia. Moreover, blocking endogenous CHOP expression using a CHOP small interfering RNA (siRNA) attenuated Aβ-induced cell death. Altogether, our data suggested that 1) inhibition of MCU exerts a neuroprotective effect on Aβ-induced microglia apoptosis, and 2) that the underlying mechanism may be related to reducing mitochondrial ROS-mediated ER stress.
Collapse
Affiliation(s)
- Nanchang Xie
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Chuanjie Wu
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Cui Wang
- Clinical Laboratory, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xuan Cheng
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Lu Zhang
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Haifeng Zhang
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yajun Lian
- Department of Neurology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| |
Collapse
|
66
|
Doolen S, Cook J, Riedl M, Kitto K, Kohsaka S, Honda CN, Fairbanks CA, Taylor BK, Vulchanova L. Complement 3a receptor in dorsal horn microglia mediates pronociceptive neuropeptide signaling. Glia 2017; 65:1976-1989. [PMID: 28850719 DOI: 10.1002/glia.23208] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 08/02/2017] [Accepted: 08/04/2017] [Indexed: 01/03/2023]
Abstract
The complement 3a receptor (C3aR1) participates in microglial signaling under pathological conditions and was recently shown to be activated by the neuropeptide TLQP-21. We previously demonstrated that TLQP-21 elicits hyperalgesia and contributes to nerve injury-induced hypersensitivity through an unknown mechanism in the spinal cord. Here we determined that this mechanism requires C3aR1 and that microglia are the cellular target for TLQP-21. We propose a novel neuroimmune signaling pathway involving TLQP-21-induced activation of microglial C3aR1 that then contributes to spinal neuroplasticity and neuropathic pain. This unique dual-ligand activation of C3aR1 by a neuropeptide (TLQP-21) and an immune mediator (C3a) represents a potential broad-spectrum mechanism throughout the CNS for integration of neuroimmune crosstalk at the molecular level.
Collapse
Affiliation(s)
- Suzanne Doolen
- Department of Physiology, University of Kentucky, 800 Rose Street, Lexington, Kentucky, 40536-0298
| | - Jennifer Cook
- Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota
| | - Maureen Riedl
- Departments of Neuroscience, University of Minnesota, Minneapolis, Minnesota, 55455
| | - Kelley Kitto
- Departments of Neuroscience, University of Minnesota, Minneapolis, Minnesota, 55455
| | | | - Christopher N Honda
- Departments of Neuroscience, University of Minnesota, Minneapolis, Minnesota, 55455
| | - Carolyn A Fairbanks
- Departments of Neuroscience, University of Minnesota, Minneapolis, Minnesota, 55455.,Departments of Pharmaceutics, University of Minnesota, Minneapolis, Minnesota, 55455.,Departments of Pharmacology, University of Minnesota, Minneapolis, Minnesota, 55455
| | - Bradley K Taylor
- Department of Physiology, University of Kentucky, 800 Rose Street, Lexington, Kentucky, 40536-0298
| | - Lucy Vulchanova
- Departments of Neuroscience, University of Minnesota, Minneapolis, Minnesota, 55455
| |
Collapse
|
67
|
Brawek B, Liang Y, Savitska D, Li K, Fomin-Thunemann N, Kovalchuk Y, Zirdum E, Jakobsson J, Garaschuk O. A new approach for ratiometric in vivo calcium imaging of microglia. Sci Rep 2017; 7:6030. [PMID: 28729628 PMCID: PMC5519759 DOI: 10.1038/s41598-017-05952-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 06/07/2017] [Indexed: 11/09/2022] Open
Abstract
Microglia, resident immune cells of the brain, react to the presence of pathogens/danger signals with a large repertoire of functional responses including morphological changes, proliferation, chemotaxis, production/release of cytokines, and phagocytosis. In vitro studies suggest that many of these effector functions are Ca2+-dependent, but our knowledge about in vivo Ca2+ signalling in microglia is rudimentary. This is mostly due to technical reasons, as microglia largely resisted all attempts of in vivo labelling with Ca2+ indicators. Here, we introduce a novel approach, utilizing a microglia-specific microRNA-9-regulated viral vector, enabling the expression of a genetically-encoded ratiometric Ca2+ sensor Twitch-2B in microglia. The Twitch-2B-assisted in vivo imaging enables recording of spontaneous and evoked microglial Ca2+ signals and allows for the first time to monitor the steady state intracellular Ca2+ levels in microglia. Intact in vivo microglia show very homogenous and low steady state intracellular Ca2+ levels. However, the levels increase significantly after acute slice preparation and cell culturing along with an increase in the expression of activation markers CD68 and IL-1β. These data identify the steady state intracellular Ca2+ level as a versatile microglial activation marker, which is highly sensitive to the cell's environment.
Collapse
Affiliation(s)
- Bianca Brawek
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | - Yajie Liang
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | - Daria Savitska
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | - Kaizhen Li
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | | | - Yury Kovalchuk
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | - Elizabeta Zirdum
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany
| | - Johan Jakobsson
- Laboratory of Molecular Neurogenetics, Department of Experimental Medical Science, Wallenberg Neuroscience Center and Lund Stem Cell Center, Lund University, Lund, 221 84, Sweden
| | - Olga Garaschuk
- Institute of Physiology II, University of Tübingen, 72074, Tübingen, Germany.
| |
Collapse
|
68
|
Brawek B, Garaschuk O. Monitoring in vivo function of cortical microglia. Cell Calcium 2017; 64:109-117. [DOI: 10.1016/j.ceca.2017.02.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 02/08/2017] [Indexed: 02/01/2023]
|
69
|
Stokes L, Layhadi JA, Bibic L, Dhuna K, Fountain SJ. P2X4 Receptor Function in the Nervous System and Current Breakthroughs in Pharmacology. Front Pharmacol 2017; 8:291. [PMID: 28588493 PMCID: PMC5441391 DOI: 10.3389/fphar.2017.00291] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 05/05/2017] [Indexed: 12/18/2022] Open
Abstract
Adenosine 5′-triphosphate is a well-known extracellular signaling molecule and neurotransmitter known to activate purinergic P2X receptors. Information has been elucidated about the structure and gating of P2X channels following the determination of the crystal structure of P2X4 (zebrafish), however, there is still much to discover regarding the role of this receptor in the central nervous system (CNS). In this review we provide an overview of what is known about P2X4 expression in the CNS and discuss evidence for pathophysiological roles in neuroinflammation and neuropathic pain. Recent advances in the development of pharmacological tools including selective antagonists (5-BDBD, PSB-12062, BX430) and positive modulators (ivermectin, avermectins, divalent cations) of P2X4 will be discussed.
Collapse
Affiliation(s)
- Leanne Stokes
- School of Pharmacy, University of East Anglia, Norwich Research ParkNorwich, United Kingdom.,School of Biomedical and Health Sciences, RMIT University, BundooraVIC, Australia
| | - Janice A Layhadi
- Biomedical Research Centre, School of Biological Sciences, University of East AngliaNorwich, United Kingdom
| | - Lucka Bibic
- School of Pharmacy, University of East Anglia, Norwich Research ParkNorwich, United Kingdom
| | - Kshitija Dhuna
- School of Biomedical and Health Sciences, RMIT University, BundooraVIC, Australia
| | - Samuel J Fountain
- Biomedical Research Centre, School of Biological Sciences, University of East AngliaNorwich, United Kingdom
| |
Collapse
|
70
|
Intracellular Ca2+ homeostasis and JAK1/STAT3 pathway are involved in the protective effect of propofol on BV2 microglia against hypoxia-induced inflammation and apoptosis. PLoS One 2017; 12:e0178098. [PMID: 28542400 PMCID: PMC5441598 DOI: 10.1371/journal.pone.0178098] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Accepted: 05/07/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Perioperative hypoxia may induce microglial inflammation and apoptosis, resulting in brain injury. The neuroprotective effect of propofol against hypoxia has been reported, but the underlying mechanisms are far from clear. In this study, we explored whether and how propofol could attenuate microglia BV2 cells from CoCl2-induced hypoxic injury. METHODS Mouse microglia BV2 cells were pretreated with propofol, and then stimulated with CoCl2. TNF-α level in the culture medium was measured by ELISA kit. Cell apoptosis and intracellular calcium concentration were measured by flow cytometry analysis. The effect of propofol on CoCl2-modulated expression of Ca2+/Calmodulin (CaM)-dependent protein kinase II (CAMKIIα), phosphorylated CAMKIIα (pCAMKIIα), STAT3, pSTAT3Y705, pSTAT3S727, ERK1/2, pERK1/2, pNFκB(p65), pro-caspase3, cleaved caspase 3, JAK1, pJAK1, JAK2, pJAK2 were detected by Western blot. RESULTS In BV2 cell, CoCl2 treatment time-dependently increased TNF-α release and induced apoptosis, which were alleviated by propofol. CoCl2 (500μmol/L, 8h) treatment increased intracellular Ca2+ level, and caused the phosphorylation of CAMKIIα, ERK1/2 and NFκB (p65), as well as the activation of caspase 3. More importantly, these effects could be modulated by 25μmol/L propofol via maintaining intracellular Ca2+ homeostasis and via up-regulating the phosphorylation of JAK1 and STAT3 at Tyr705. CONCLUSION Propofol could protect BV2 microglia from hypoxia-induced inflammation and apoptosis. The potential mechanisms may involve the maintaining of intracellular Ca2+ homeostasis and the activation of JAK1/STAT3 pathway.
Collapse
|
71
|
Au NPB, Ma CHE. Recent Advances in the Study of Bipolar/Rod-Shaped Microglia and their Roles in Neurodegeneration. Front Aging Neurosci 2017; 9:128. [PMID: 28522972 PMCID: PMC5415568 DOI: 10.3389/fnagi.2017.00128] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 04/18/2017] [Indexed: 01/06/2023] Open
Abstract
Microglia are the resident immune cells of the central nervous system (CNS) and they contribute to primary inflammatory responses following CNS injuries. The morphology of microglia is closely associated with their functional activities. Most previous research efforts have attempted to delineate the role of ramified and amoeboid microglia in the pathogenesis of neurodegenerative diseases. In addition to ramified and amoeboid microglia, bipolar/rod-shaped microglia were first described by Franz Nissl in 1899 and their presence in the brain was closely associated with the pathology of infectious diseases and sleeping disorders. However, studies relating to bipolar/rod-shaped microglia are very limited, largely due to the lack of appropriate in vitro and in vivo experimental models. Recent studies have reported the formation of bipolar/rod-shaped microglia trains in in vivo models of CNS injury, including diffuse brain injury, focal transient ischemia, optic nerve transection and laser-induced ocular hypertension (OHT). These bipolar/rod-shaped microglia formed end-to-end alignments in close proximity to the adjacent injured axons, but they showed no interactions with blood vessels or other types of glial cell. Recent studies have also reported on a highly reproducible in vitro culture model system to enrich bipolar/rod-shaped microglia that acts as a powerful tool with which to characterize this form of microglia. The molecular aspects of bipolar/rod-shaped microglia are of great interest in the field of CNS repair. This review article focuses on studies relating to the morphology and transformation of microglia into the bipolar/rod-shaped form, along with the differential gene expression and spatial distribution of bipolar/rod-shaped microglia in normal and pathological CNSs. The spatial arrangement of bipolar/rod-shaped microglia is crucial in the reorganization and remodeling of neuronal and synaptic circuitry following CNS injuries. Finally, we discuss the potential neuroprotective roles of bipolar/rod-shaped microglia, and the possibility of transforming ramified/amoeboid microglia into bipolar/rod-shaped microglia. This will be of considerable clinical benefit in the development of novel therapeutic strategies for treating various neurodegenerative diseases and promoting CNS repair after injury.
Collapse
Affiliation(s)
- Ngan Pan Bennett Au
- Department of Biomedical Sciences, City University of Hong KongKowloon Tong, Hong Kong
| | - Chi Him Eddie Ma
- Department of Biomedical Sciences, City University of Hong KongKowloon Tong, Hong Kong.,Centre for Biosystems, Neuroscience, and Nanotechnology, City University of Hong KongKowloon Tong, Hong Kong.,State Key Laboratory in Marine Pollution, City University of Hong KongKowloon Tong, Hong Kong
| |
Collapse
|
72
|
TRPM2 contributes to LPC-induced intracellular Ca 2+ influx and microglial activation. Biochem Biophys Res Commun 2017; 485:301-306. [PMID: 28223219 DOI: 10.1016/j.bbrc.2017.02.087] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 02/17/2017] [Indexed: 12/29/2022]
Abstract
Microglia are the resident immune cells which become activated in some pathological conditions in central nervous system (CNS). Lysophosphatidylcholine (LPC), an endogenous inflammatory phospholipid, is implicated in immunomodulatory function of glial cells in the CNS. Although several studies uncovered that LPC induces intracellular Ca2+ influx and morphologic change in microglia, there is still no direct evidence showing change of phosphorylation of mitogen-activated protein kinase (MAPK) p38 (p-p38), a widely used microglia activation marker, by LPC. Furthermore, the cellular mechanism of LPC-induced microglia activation remains unknown. In this study, we found that LPC induced intracellular Ca2+ increase in primary cultured microglia, which was blocked in the presence of Gd3+, non-selective transient receptor potential (TRP) channel blocker. RT-PCR and whole cell patch clamp recordings revealed molecular and functional expression of TRP melastatin 2 (TRPM2) in microglia. Using western blotting, we also observed that LPC increased phosphorylation of p38 MAPK, and the increase of p-p38 expression is also reversed in TRPM2-knockout (KO) microglia. Moreover, LPC induced membrane trafficking of TRPM2 and intrathecal injection of LPC increased Iba-1 immunoreactivity in the spinal cord, which were significantly reduced in KO mice. In addition, LPC-induced intracellular Ca2+ increase and inward currents were abolished in TRPM2-KO microglia. Taken together, our results suggest that LPC induces intracellular Ca2+ influx and increases phosphorylation of p38 MAPK via TRPM2, which in turn activates microglia.
Collapse
|
73
|
UDP-Induced Phagocytosis and ATP-Stimulated Chemotactic Migration Are Impaired in STIM1-/- Microglia In Vitro and In Vivo. Mediators Inflamm 2017; 2017:8158514. [PMID: 28293066 PMCID: PMC5331284 DOI: 10.1155/2017/8158514] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/22/2016] [Accepted: 12/06/2016] [Indexed: 02/06/2023] Open
Abstract
STIM1 is the only currently known intracellular calcium sensor that functions as the calcium influx regulator controlling immune cell activation. STIM1 function in immune cell calcium signalling has been studied extensively; however, its role in microglia, innate immune cells in brain, has not been fully understood. Here, we report that STIM1−/− murine microglia lost store-operated calcium influx and displayed aberrant immunological functions. Microglial functions regulated by chronic and global [Ca2+]i changes were reduced significantly, including cytokine releases and opsonin-dependent phagocytosis. More dramatically, cellular functions governed by Ca2+ regulation in local microdomains at the cell periphery, such as UDP-induced phagocytosis and ATP-stimulated chemotactic migration, were severely reduced in STIM1−/− microglia. Interestingly, UDP-induced Orai1 mobilization to the peripheral region was greatly attenuated in STIM1−/− microglia. Their chemotactic migration defect was reproduced in vivo in embryonic brain; the aggregated number of STIM1−/− microglia in LPS- (lipopolysaccharide-) injected lesions was much smaller than that in wild-type microglia. Furthermore, the neuron phagoptosis activities of activated microglia were significantly diminished in the STIM1−/− microglia. These in vitro and in vivo results suggest that STIM1-mediated store-operated calcium entry is important for the regulation of global [Ca2+]i changes which differentiates into active immune state of microglia, but it is more crucial for the regulation of local [Ca2+] microdomains which mediates the acute motility of murine microglia.
Collapse
|
74
|
Xu Z, Liu Y, Yang D, Yuan F, Ding J, Wang L, Qu M, Yang G, Tian H. Glibenclamide–sulfonylurea receptor 1 antagonist alleviates LPS-induced BV2 cell activation through the p38/MAPK pathway. RSC Adv 2017. [DOI: 10.1039/c7ra03042h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We investigated the anti-neuroinflammatory activity and mechanism of glibenclamide, sulfonylurea receptor 1 (Sur1) antagonist, against LPS-induced microglial activationin vitro.
Collapse
Affiliation(s)
- Zhiming Xu
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| | - Yingliang Liu
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| | - Dianxu Yang
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| | - Fang Yuan
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| | - Jun Ding
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| | - Liping Wang
- Department of Neurology
- Ruijin Hospital
- Shanghai Jiao Tong University School of Medicine
- Shanghai
- China
| | - Meijie Qu
- Department of Neurology
- Ruijin Hospital
- Shanghai Jiao Tong University School of Medicine
- Shanghai
- China
| | - Guoyuan Yang
- Department of Neurology
- Ruijin Hospital
- Shanghai Jiao Tong University School of Medicine
- Shanghai
- China
| | - Hengli Tian
- Department of Neurosurgery
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai
- China
| |
Collapse
|
75
|
Aripiprazole inhibits polyI:C-induced microglial activation possibly via TRPM7. Schizophr Res 2016; 178:35-43. [PMID: 27614570 DOI: 10.1016/j.schres.2016.08.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 08/20/2016] [Accepted: 08/20/2016] [Indexed: 12/13/2022]
Abstract
Viral infections during fetal and adolescent periods, as well as during the course of schizophrenia itself have been linked to the onset and/or relapse of a psychosis. We previously reported that the unique antipsychotic aripiprazole, a partial D2 agonist, inhibits the release of tumor necrosis factor (TNF)-α from interferon-γ-activated rodent microglial cells. Polyinosinic-polycytidylic acid (polyI:C) has recently been used as a standard model of viral infections, and recent in vitro studies have shown that microglia are activated by polyI:C. Aripiprazole has been reported to ameliorate behavioral abnormalities in polyI:C-induced mice. To clarify the anti-inflammatory properties of aripiprazole, we investigated the effects of aripiprazole on polyI:C-induced microglial activation in a cellular model of murine microglial cells and possible surrogate cells for human microglia. PolyI:C treatment of murine microglial cells activated the production of TNF-α and enhanced the p38 mitogen-activated protein kinase (MAPK) pathway, whereas aripiprazole inhibited these responses. In addition, polyI:C treatment of possible surrogate cells for human microglia markedly increased TNF-α mRNA expression in cells from three healthy volunteers. Aripiprazole inhibited this increase in cells from two individuals. PolyI:C consistently increased intracellular Ca2+ concentration ([Ca2+]i) in murine microglial cells by influx of extracellular Ca2+. We demonstrated that transient receptor potential in melastatin 7 (TRPM7) channels contributed to this polyI:C-induced increase in [Ca2+]i. Taken together, these data suggest that aripiprazole may be therapeutic for schizophrenia by reducing microglial inflammatory reactions, and TRPM7 may be a novel therapeutic target for schizophrenia. Further studies are needed to validate these findings.
Collapse
|
76
|
Korvers L, de Andrade Costa A, Mersch M, Matyash V, Kettenmann H, Semtner M. Spontaneous Ca 2+ transients in mouse microglia. Cell Calcium 2016; 60:396-406. [PMID: 27697289 DOI: 10.1016/j.ceca.2016.09.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/21/2016] [Accepted: 09/21/2016] [Indexed: 02/07/2023]
Abstract
Microglia are the resident immune cells in the central nervous system and many of their physiological functions are known to be linked to intracellular calcium (Ca2+) signaling. Here we show that isolated and purified mouse microglia-either freshly or cultured-display spontaneous and transient Ca2+ elevations lasting for around ten to twenty seconds and occurring at frequencies of around five to ten events per hour and cell. The events were absent after depletion of internal Ca2+ stores, by phospholipase C (PLC) inhibition or blockade of inositol-1,4,5-trisphosphate receptors (IP3Rs), but not by removal of extracellular Ca2+, indicating that Ca2+ is released from endoplasmic reticulum intracellular stores. We furthermore provide evidence that autocrine ATP release and subsequent activation of purinergic P2Y receptors is not the trigger for these events. Spontaneous Ca2+ transients did also occur after stimulation with Lipopolysaccharide (LPS) and in glioma-associated microglia, but their kinetics differed from control conditions. We hypothesize that spontaneous Ca2+ transients reflect aspects of cellular homeostasis that are linked to regular and patho-physiological functions of microglia.
Collapse
Affiliation(s)
- Laura Korvers
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany
| | - Amanda de Andrade Costa
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany
| | - Martin Mersch
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany
| | - Vitali Matyash
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany
| | - Helmut Kettenmann
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany
| | - Marcus Semtner
- Max-Delbrueck-Centrum for Molecular Medicine (MDC) in the Helmholtz Association, Cellular Neurosciences, Robert-Roessle-Str. 10, 13092 Berlin, Germany.
| |
Collapse
|
77
|
Gajardo-Gómez R, Labra VC, Orellana JA. Connexins and Pannexins: New Insights into Microglial Functions and Dysfunctions. Front Mol Neurosci 2016; 9:86. [PMID: 27713688 PMCID: PMC5031785 DOI: 10.3389/fnmol.2016.00086] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 09/05/2016] [Indexed: 12/11/2022] Open
Abstract
Under physiological conditions, microglia adopt a resting phenotype associated with the production of anti-inflammatory and neurotrophic factors. In response to a wide variety of insults, these cells shift to an activated phenotype that is necessary for the proper restoration of brain homeostasis. However, when the intensity of a threat is relatively high, microglial activation worsens the progression of damage rather than providing protection, with potentially significant consequences for neuronal survival. Coordinated interactions among microglia and other brain cells, including astrocytes and neurons, are critical for the development of timely and optimal inflammatory responses in the brain parenchyma. Tissue synchronization is in part mediated by connexins and pannexins, which are protein families that form different plasma membrane channels to communicate with neighboring cells. Gap junction channels (which are exclusively formed by connexins in vertebrates) connect the cytoplasm of contacting cells to coordinate electrical and metabolic coupling. Hemichannels (HCs) and pannexons (which are formed by connexins and pannexins, respectively) communicate the intra- and extracellular compartments and serve as diffusion pathways for the exchange of ions and small molecules. In this review article, we discuss the available evidence concerning the functional expression and regulation of connexin- and pannexin-based channels in microglia and their contributions to microglial function and dysfunction. Specifically, we focus on the possible implications of these channels in microglia-to-microglia, microglia-to-astrocyte and neuron-to-microglia interactions in the inflamed brain.
Collapse
Affiliation(s)
- Rosario Gajardo-Gómez
- Departamento de Neurología, Escuela de Medicina, Pontificia Universidad Católica de Chile Santiago, Chile
| | - Valeria C Labra
- Departamento de Neurología, Escuela de Medicina, Pontificia Universidad Católica de Chile Santiago, Chile
| | - Juan A Orellana
- Departamento de Neurología, Escuela de Medicina, Pontificia Universidad Católica de Chile Santiago, Chile
| |
Collapse
|
78
|
Kurland DB, Gerzanich V, Karimy JK, Woo SK, Vennekens R, Freichel M, Nilius B, Bryan J, Simard JM. The Sur1-Trpm4 channel regulates NOS2 transcription in TLR4-activated microglia. J Neuroinflammation 2016; 13:130. [PMID: 27246103 PMCID: PMC4888589 DOI: 10.1186/s12974-016-0599-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Accepted: 05/24/2016] [Indexed: 12/12/2022] Open
Abstract
Background Harmful effects of activated microglia are due, in part, to the formation of peroxynitrite radicals, which is attributable to the upregulation of inducible nitric oxide (NO) synthase (NOS2). Because NOS2 expression is determined by Ca2+-sensitive calcineurin (CN) dephosphorylating nuclear factor of activated T cells (NFAT), and because Sur1-Trpm4 channels are crucial for regulating Ca2+ influx, we hypothesized that, in activated microglia, Sur1-Trpm4 channels play a central role in regulating CN/NFAT and downstream target genes such as Nos2. Methods We studied microglia in vivo and in primary culture from adult rats, and from wild type, Abcc8−/− and Trpm4−/− mice, and immortalized N9 microglia, following activation of Toll-like receptor 4 (TLR4) by lipopolysaccharide (LPS), using in situ hybridization, immunohistochemistry, co-immunoprecipitation, immunoblot, qPCR, patch clamp electrophysiology, calcium imaging, the Griess assay, and chromatin immunoprecipitation. Results In microglia in vivo and in vitro, LPS activation of TLR4 led to de novo upregulation of Sur1-Trpm4 channels and CN/NFAT-dependent upregulation of Nos2 mRNA, NOS2 protein, and NO. Pharmacological inhibition of Sur1 (glibenclamide), Trpm4 (9-phenanthrol), or gene silencing of Abcc8 or Trpm4 reduced Nos2 upregulation. Inhibiting Sur1-Trpm4 increased the intracellular calcium concentration ([Ca2+]i), as expected, but also decreased NFAT nuclear translocation. The increase in [Ca2+]i induced by inhibiting or silencing Sur1-Trpm4 resulted in phosphorylation of Ca2+/calmodulin protein kinase II and of CN, consistent with reduced nuclear translocation of NFAT. The regulation of NFAT by Sur1-Trpm4 was confirmed using chromatin immunoprecipitation. Conclusions Sur1-Trpm4 constitutes a novel mechanism by which TLR4-activated microglia regulate pro-inflammatory, Ca2+-sensitive gene expression, including Nos2.
Collapse
Affiliation(s)
- David B Kurland
- Department of Neurosurgery, University of Maryland School of Medicine, 22 S. Greene St., Suite S12D, Baltimore, MD, 21201-1595, USA. .,Neurosurgery Research Laboratories, 10 S. Pine St, Baltimore, MD, 21201-1595, USA.
| | - Volodymyr Gerzanich
- Department of Neurosurgery, University of Maryland School of Medicine, 22 S. Greene St., Suite S12D, Baltimore, MD, 21201-1595, USA
| | - Jason K Karimy
- Department of Neurosurgery, University of Maryland School of Medicine, 22 S. Greene St., Suite S12D, Baltimore, MD, 21201-1595, USA
| | - Seung Kyoon Woo
- Department of Neurosurgery, University of Maryland School of Medicine, 22 S. Greene St., Suite S12D, Baltimore, MD, 21201-1595, USA
| | - Rudi Vennekens
- Department Cell Molecular Medicine, Laboratory Ion Channel Research, Campus Gasthuisberg, Herestraat 49-Bus 802, Leuven, 3000, Belgium
| | - Marc Freichel
- Pharmakologisches Institut, Universität Heidelberg, Im Neuenheimer Feld 366, Heidelberg, 69120, Germany
| | - Bernd Nilius
- Department Cell Molecular Medicine, Laboratory Ion Channel Research, Campus Gasthuisberg, Herestraat 49-Bus 802, Leuven, 3000, Belgium
| | - Joseph Bryan
- Pacific Northwest Diabetes Research Institute, 720 Broadway, Seattle, WA, 98122, USA
| | - J Marc Simard
- Department of Neurosurgery, University of Maryland School of Medicine, 22 S. Greene St., Suite S12D, Baltimore, MD, 21201-1595, USA. .,Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA. .,Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA.
| |
Collapse
|
79
|
Chiarini A, Armato U, Liu D, Dal Prà I. Calcium-Sensing Receptors of Human Neural Cells Play Crucial Roles in Alzheimer's Disease. Front Physiol 2016; 7:134. [PMID: 27199760 PMCID: PMC4844916 DOI: 10.3389/fphys.2016.00134] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 03/28/2016] [Indexed: 12/21/2022] Open
Abstract
In aged subjects, late-onset Alzheimer's disease (LOAD) starts in the lateral entorhinal allocortex where a failure of clearance mechanisms triggers an accumulation of neurotoxic amyloid-β42 oligomers (Aβ42-os). In neurons and astrocytes, Aβ42-os enhance the transcription of Aβ precursor protein (APP) and β-secretase/BACE1 genes. Thus, by acting together with γ-secretase, the surpluses of APP and BACE1 amplify the endogenous production of Aβ42-os which pile up, damage mitochondria, and are oversecreted. At the plasmalemma, exogenous Aβ42-os bind neurons' and astrocytes' calcium-sensing receptors (CaSRs) activating a set of intracellular signaling pathways which upkeep Aβ42-os intracellular accumulation and oversecretion by hindering Aβ42-os proteolysis. In addition, Aβ42-os accumulating in the extracellular milieu spread and reach mounting numbers of adjacent and remoter teams of neurons and astrocytes which in turn are recruited, again via Aβ42-os•CaSR-governed mechanisms, to produce and release additional Aβ42-os amounts. This relentless self-sustaining mechanism drives AD progression toward upper cortical areas. Later on accumulating Aβ42-os elicit the advent of hyperphosphorylated (p)-Tau oligomers which acting together with Aβ42-os and other glial neurotoxins cooperatively destroy wider and wider cognition-related cortical areas. In parallel, Aβ42-os•CaSR signals also elicit an excess production and secretion of nitric oxide and vascular endothelial growth factor-A from astrocytes, of Aβ42-os and myelin basic protein from oligodendrocytes, and of proinflammatory cytokines, nitric oxide and (likely) Aβ42-os from microglia. Activated astrocytes and microglia survive the toxic onslaught, whereas neurons and oligodendrocytes increasingly die. However, we have shown that highly selective allosteric CaSR antagonists (calcilytics), like NPS 2143 and NPS 89626, efficiently suppress all the neurotoxic effects Aβ42-os•CaSR signaling drives in cultured cortical untransformed human neurons and astrocytes. In fact, calcilytics increase Aβ42 proteolysis and discontinue the oversecretion of Aβ42-os, nitric oxide, and vascular endothelial growth factor-A from both astrocytes and neurons. Seemingly, calcilytics would also benefit the other types of glial cells and cerebrovascular cells otherwise damaged by the effects of Aβ42-os•CaSR signaling. Thus, given at amnestic minor cognitive impairment (aMCI) or initial symptomatic stages, calcilytics could prevent or terminate the propagation of LOAD neuropathology and preserve human neurons' viability and hence patients' cognitive abilities.
Collapse
Affiliation(s)
- Anna Chiarini
- Human Histology and Embryology Unit, University of Verona Medical SchoolVerona, Italy
| | - Ubaldo Armato
- Human Histology and Embryology Unit, University of Verona Medical SchoolVerona, Italy
| | - Daisong Liu
- Human Histology and Embryology Unit, University of Verona Medical SchoolVerona, Italy
- Proteomics Laboratory, Institute for Burn Research, Third Military Medical UniversityChongqing, China
| | - Ilaria Dal Prà
- Human Histology and Embryology Unit, University of Verona Medical SchoolVerona, Italy
| |
Collapse
|
80
|
Yuan L, Liu S, Bai X, Gao Y, Liu G, Wang X, Liu D, Li T, Hao A, Wang Z. Oxytocin inhibits lipopolysaccharide-induced inflammation in microglial cells and attenuates microglial activation in lipopolysaccharide-treated mice. J Neuroinflammation 2016; 13:77. [PMID: 27075756 PMCID: PMC4831099 DOI: 10.1186/s12974-016-0541-7] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 04/06/2016] [Indexed: 12/21/2022] Open
Abstract
Background Overactivated microglia is involved in various kinds of neurodegenerative diseases. Suppression of microglial overactivation has emerged as a novel strategy for treatment of neuroinflammation-based neurodegeneration. In the current study, anti-inflammatory effects of oxytocin (OT), which is a highly conserved nonapeptide with hormone and neurotransmitter properties, were investigated in vitro and in vivo. Methods BV-2 cells and primary microglia were pre-treated with OT (0.1, 1, and 10 μM) for 2 h followed by LPS treatment (500 ng/ml); microglial activation and pro-inflammatory mediators were measured by Western blot, RT-PCR, and immunofluorescence. The MAPK and NF-κB pathway proteins were assessed by Western blot. The intracellular calcium concentration ([Ca2+]i) was determined using Fluo2-/AM assay. Intranasal application of OT was pre-treated in BALB/C mice (adult male) followed by injected intraperitoneally with LPS (5 mg/kg). The effect of OT on LPS-induced microglial activation and pro-inflammatory mediators was measured by Western blot, RT-PCR, and immunofluorescence in vivo. Results Using the BV-2 microglial cell line and primary microglia, we found that OT pre-treatment significantly inhibited LPS-induced microglial activation and reduced subsequent release of pro-inflammatory factors. In addition, OT inhibited phosphorylation of ERK and p38 but not JNK MAPK in LPS-induced microglia. OT remarkably reduced the elevation of [Ca2+]i in LPS-stimulated BV-2 cells. Furthermore, a systemic LPS-treated acute inflammation murine brain model was used to study the suppressive effects of OT against neuroinflammation in vivo. We found that pre-treatment with OT showed marked attenuation of microglial activation and pro-inflammatory factor levels. Conclusions Taken together, the present study demonstrated that OT possesses anti-neuroinflammatory activity and might serve as a potential therapeutic agent for treating neuroinflammatory diseases.
Collapse
Affiliation(s)
- Lin Yuan
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Song Liu
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Xuemei Bai
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Yan Gao
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Guangheng Liu
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Xueer Wang
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Dexiang Liu
- Department of Medical Psychology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Tong Li
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Aijun Hao
- Key Laboratory of the Ministry of Education for Experimental Teratology, Shandong Provincial Key Laboratory of Mental Disorders, Department of Histology and Embryology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China
| | - Zhen Wang
- Department of Physiology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China. .,Key Laboratory of the Ministry of Education for Experimental Teratology, Shandong Provincial Key Laboratory of Mental Disorders, Department of Histology and Embryology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, People's Republic of China.
| |
Collapse
|
81
|
Pappalardo LW, Black JA, Waxman SG. Sodium channels in astroglia and microglia. Glia 2016; 64:1628-45. [PMID: 26919466 DOI: 10.1002/glia.22967] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 12/27/2015] [Accepted: 01/04/2016] [Indexed: 12/19/2022]
Abstract
Voltage-gated sodium channels are required for electrogenesis in excitable cells. Their activation, triggered by membrane depolarization, generates transient sodium currents that initiate action potentials in neurons, cardiac, and skeletal muscle cells. Cells that have not traditionally been considered to be excitable (nonexcitable cells), including glial cells, also express sodium channels in physiological conditions as well as in pathological conditions. These channels contribute to multiple functional roles that are seemingly unrelated to the generation of action potentials. Here, we discuss the dynamics of sodium channel expression in astrocytes and microglia, and review evidence for noncanonical roles in effector functions of these cells including phagocytosis, migration, proliferation, ionic homeostasis, and secretion of chemokines/cytokines. We also examine possible mechanisms by which sodium channels contribute to the activity of glial cells, with an eye toward therapeutic implications for central nervous system disease. GLIA 2016;64:1628-1645.
Collapse
Affiliation(s)
- Laura W Pappalardo
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT.,Rehabilitation Research Center, VA Connecticut Healthcare System, West Haven, CT
| | - Joel A Black
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT.,Rehabilitation Research Center, VA Connecticut Healthcare System, West Haven, CT
| | - Stephen G Waxman
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, CT.,Rehabilitation Research Center, VA Connecticut Healthcare System, West Haven, CT
| |
Collapse
|
82
|
Crain JM, Watters JJ. Microglial P2 Purinergic Receptor and Immunomodulatory Gene Transcripts Vary By Region, Sex, and Age in the Healthy Mouse CNS. ACTA ACUST UNITED AC 2015; 3. [PMID: 26949719 DOI: 10.4172/2329-8936.1000124] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Inflammatory damage in many neurodegenerative diseases is restricted to certain regions of the CNS, and while microglia have long been implicated in the pathology of many of these disorders, information comparing their gene expression in different CNS regions is lacking. Here we tested the hypothesis that the expression of purinergic receptors, estrogen receptors and other neuroprotective and pro-inflammatory genes differed among CNS regions in healthy mice. Because neurodegenerative diseases vary in incidence by sex and age, we also examined the regional distribution of these genes in male and female mice of four different ages between 21 days and 12 months. We postulated that pro-inflammatory gene expression would be higher in older animals, and lower in young adult females. We found that microglial gene expression differed across the CNS. Estrogen receptor alpha (Esr1) mRNA levels were often lower in microglia from the brainstem/spinal cord than from the cortex, whereas tumor necrosis factor alpha (Tnfα) expression was several times higher. In addition, the regional pattern of gene expression often changed with animal age; for example, no regional differences in P2X7 mRNA levels were detected in 21 day-old animals, but at 7 weeks and older, expression was highest in cerebellar microglia. Lastly, the expression of some genes was sexually dimorphic. In microglia from 12 month-old animals, mRNA levels of inducible nitric oxide synthase, but not Tnfα, were higher in females than males. These data suggest that microglial gene expression is not uniformly more pro-inflammatory in males or older animals. Moreover, microglia from CNS regions in which neuronal damage predominates in neurodegenerative disease do not generally express more pro-inflammatory genes than microglia from regions less frequently affected. This study provides an in-depth assessment of regional-, sex- and age-dependent differences in key microglial transcripts from the healthy mouse CNS.
Collapse
Affiliation(s)
- Jessica M Crain
- Program in Cellular and Molecular Biology, University of Wisconsin, Madison, WI 53706; Center for Women's Health Research, University of Wisconsin, Madison, WI 53706
| | - Jyoti J Watters
- Department of Comparative Biosciences, University of Wisconsin, Madison, WI 53706; Program in Cellular and Molecular Biology, University of Wisconsin, Madison, WI 53706; Center for Women's Health Research, University of Wisconsin, Madison, WI 53706
| |
Collapse
|
83
|
m-Trifluoromethyl-diphenyl diselenide, a multi-target selenium compound, prevented mechanical allodynia and depressive-like behavior in a mouse comorbid pain and depression model. Prog Neuropsychopharmacol Biol Psychiatry 2015; 63:35-46. [PMID: 26025319 DOI: 10.1016/j.pnpbp.2015.05.011] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 04/17/2015] [Accepted: 05/07/2015] [Indexed: 12/30/2022]
Abstract
Chronic pain and depression are two complex states that often coexist in the clinical setting and traditional antidepressants and analgesics have shown limited clinical efficacy. There is an intricate communication between the immune system and the central nervous system and inflammation has been considered a common mediator of pain-depression comorbidity. This study evaluated the effect of m-trifluoromethyl diphenyl diselenide [(m-CF3-PhSe)2], an organoselenium compound that has been reported to have both antinociceptive and antidepressant-like actions, in the comorbidity of chronic pain and depression induced by partial sciatic nerve ligation (PSNL) in an inflammatory approach. Mice were submitted to PSNL during 4weeks and treated with (m-CF3-PhSe)2 acutely (0.1-10mg/kg, i.g.) or subchronically (0.1mg/kg, i.g., once a day during the 3rd and 4th weeks). Both treatments prevented PSNL-increased pain sensitivity and depressive-like behavior observed in Von-Frey hair (VFH) and forced swimming (FST) tests, respectively. These effects could be mainly associated with an anti-inflammatory action of (m-CF3-PhSe)2 which reduced the levels of pro-inflammatory cytokines, NF-κB and COX-2, and p38 MAPK activation that were increased by PSNL. (m-CF3-PhSe)2 also increased the BDNF levels and reduced glutamate release and 5-HT uptake altered by PSNL. Although acute and subchronic treatments with (m-CF3-PhSe)2 prevented these alterations induced by PSNL, the best results were found when (m-CF3-PhSe)2 was subchronically administered to mice. Considering the potential common mechanisms involved in the comorbidity of inflammation-induced depression and chronic pain, the results found in this study indicate that (m-CF3-PhSe)2 could become an interesting molecule to treat long-lasting pathological pain associated with depression.
Collapse
|
84
|
Huang CT, Tsai YJ. Docosahexaenoic acid confers analgesic effects after median nerve injury via inhibition of c-Jun N-terminal kinase activation in microglia. J Nutr Biochem 2015; 29:97-106. [PMID: 26895670 DOI: 10.1016/j.jnutbio.2015.11.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 11/03/2015] [Accepted: 11/20/2015] [Indexed: 12/22/2022]
Abstract
The c-Jun N-terminal kinase (JNK) in the central nervous system plays a critical role in the processing of neuropathic pain. Docosahexaenoic acid (DHA), a predominant omega-3 polyunsaturated fatty acid in the central nervous system, has a neuroprotective efficacy. In this study, we examined the relationships between JNK activation in the cuneate nucleus (CN) and behavioral hypersensitivity after chronic constriction injury (CCI) of the median nerve. We further investigated the effects of DHA administration on JNK activation and development of hypersensitivity. Using immunohistochemistry and immunoblotting, low levels of phosphorylated JNK (p-JNK) were detected in the CN of sham-operated rats. As early as 1 day after CCI, p-JNK levels in the ipsilateral CN were significantly increased and peaked at 7 days. Double-immunofluorescence labeling with cell-specific markers showed that p-JNK immunoreactive cells coexpressed OX-42, a microglia activation marker, suggesting the expression of p-JNK in the microglia. Microinjection of SP600125, a JNK inhibitor, into the CN 1 day after CCI attenuated injury-induced behavioral hypersensitivity in a dose-dependent manner. Furthermore, animals received intravenous injection of DHA at doses of 100, 250 or 500 nmol/kg 30 min after median nerve CCI. DHA treatment decreased p-JNK and OX-42 levels, diminished the release of proinflammatory cytokines and improved behavioral hypersensitivity following CCI. In conclusion, median nerve injury-induced microglial JNK activation in the CN modulated development of behavioral hypersensitivity. DHA has analgesic effects on neuropathic pain, at least in part, by means of suppressing a microglia-mediated inflammatory response through the inhibition of JNK signaling pathway.
Collapse
Affiliation(s)
- Chun-Ta Huang
- Department of Internal Medicine and Traumatology, National Taiwan University Hospital, Taipei, Taiwan
| | - Yi-Ju Tsai
- Graduate Institute of Basic Medicine and School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.
| |
Collapse
|
85
|
Szabo M, Dulka K, Gulya K. Calmodulin inhibition regulates morphological and functional changes related to the actin cytoskeleton in pure microglial cells. Brain Res Bull 2015; 120:41-57. [PMID: 26551061 DOI: 10.1016/j.brainresbull.2015.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 10/26/2015] [Accepted: 11/03/2015] [Indexed: 01/24/2023]
Abstract
The roles of calmodulin (CaM), a multifunctional intracellular calcium receptor protein, as concerns selected morphological and functional characteristics of pure microglial cells derived from mixed primary cultures from embryonal forebrains of rats, were investigated through use of the CaM antagonists calmidazolium (CALMID) and trifluoperazine (TFP). The intracellular localization of the CaM protein relative to phalloidin, a bicyclic heptapeptide that binds only to filamentous actin, and the ionized calcium-binding adaptor molecule 1 (Iba1), a microglia-specific actin-binding protein, was determined by immunocytochemistry, with quantitative analysis by immunoblotting. In unchallenged and untreated (control) microglia, high concentrations of CaM protein were found mainly perinuclearly in ameboid microglia, while the cell cortex had a smaller CaM content that diminished progressively deeper into the branches in the ramified microglia. The amounts and intracellular distributions of both Iba1 and CaM proteins were altered after lipopolysaccharide (LPS) challenge in activated microglia. CALMID and TFP exerted different, sometimes opposing, effects on many morphological, cytoskeletal and functional characteristics of the microglial cells. They affected the CaM and Iba1 protein expressions and their intracellular localizations differently, inhibited cell proliferation, viability and fluid-phase phagocytosis to different degrees both in unchallenged and in LPS-treated (immunologically challenged) cells, and differentially affected the reorganization of the actin cytoskeleton in the microglial cell cortex, influencing lamellipodia, filopodia and podosome formation. In summary, these CaM antagonists altered different aspects of filamentous actin-based cell morphology and related functions with variable efficacy, which could be important in deciphering the roles of CaM in regulating microglial functions in health and disease.
Collapse
Affiliation(s)
- Melinda Szabo
- Department of Cell Biology and Molecular Medicine, University of Szeged, Szeged, Hungary
| | - Karolina Dulka
- Department of Cell Biology and Molecular Medicine, University of Szeged, Szeged, Hungary
| | - Karoly Gulya
- Department of Cell Biology and Molecular Medicine, University of Szeged, Szeged, Hungary.
| |
Collapse
|
86
|
Stebbing MJ, Cottee JM, Rana I. The Role of Ion Channels in Microglial Activation and Proliferation - A Complex Interplay between Ligand-Gated Ion Channels, K(+) Channels, and Intracellular Ca(2.). Front Immunol 2015; 6:497. [PMID: 26557116 PMCID: PMC4617059 DOI: 10.3389/fimmu.2015.00497] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 09/14/2015] [Indexed: 12/17/2022] Open
Abstract
Microglia are often referred to as the immune cells of the brain. They are most definitely involved in immune responses to invading pathogens and inflammatory responses to tissue damage. However, recent results suggest microglia are vital for normal functioning of the brain. Neuroinflammation, as well as more subtle changes, in microglial function has been implicated in the pathogenesis of many brain diseases and disorders. Upon sensing alterations in their local environment, microglia change their shape and release factors that can modify the excitability of surrounding neurons. During neuroinflammation, microglia proliferate and release NO, reactive oxygen species, cytokines and chemokines. If inflammation resolves then their numbers normalize again via apoptosis. Microglia express a wide array of ion channels and different types are implicated in all of the cellular processes listed above. Modulation of microglial ion channels has shown great promise as a therapeutic strategy in several brain disorders. In this review, we discuss recent advances in our knowledge of microglial ion channels and their roles in responses of microglia to changes in the extracellular milieu.
Collapse
Affiliation(s)
- Martin James Stebbing
- Health Innovations Research Institute and School of Medical Sciences, RMIT University , Bundoora, VIC , Australia
| | - Jennifer Marie Cottee
- Health Innovations Research Institute and School of Medical Sciences, RMIT University , Bundoora, VIC , Australia
| | - Indrajeetsinh Rana
- Health Innovations Research Institute and School of Medical Sciences, RMIT University , Bundoora, VIC , Australia ; School of Health Sciences, Federation University Australia , Ballarat, VIC , Australia
| |
Collapse
|
87
|
Uhlemann R, Gertz K, Boehmerle W, Schwarz T, Nolte C, Freyer D, Kettenmann H, Endres M, Kronenberg G. Actin dynamics shape microglia effector functions. Brain Struct Funct 2015; 221:2717-34. [PMID: 25989853 DOI: 10.1007/s00429-015-1067-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 05/15/2015] [Indexed: 11/28/2022]
Abstract
Impaired actin filament dynamics have been associated with cellular senescence. Microglia, the resident immune cells of the brain, are emerging as a central pathophysiological player in neurodegeneration. Microglia activation, which ranges on a continuum between classical and alternative, may be of critical importance to brain disease. Using genetic and pharmacological manipulations, we studied the effects of alterations in actin dynamics on microglia effector functions. Disruption of actin dynamics did not affect transcription of genes involved in the LPS-triggered classical inflammatory response. By contrast, in consequence of impaired nuclear translocation of phospho-STAT6, genes involved in IL-4 induced alternative activation were strongly downregulated. Functionally, impaired actin dynamics resulted in reduced NO secretion and reduced release of TNFalpha and IL-6 from LPS-stimulated microglia and of IGF-1 from IL-4 stimulated microglia. However, pathological stabilization of the actin cytoskeleton increased LPS-induced release of IL-1beta and IL-18, which belong to an unconventional secretory pathway. Reduced NO release was associated with decreased cytoplasmic iNOS protein expression and decreased intracellular arginine uptake. Furthermore, disruption of actin dynamics resulted in reduced microglia migration, proliferation and phagocytosis. Finally, baseline and ATP-induced [Ca(2+)]int levels were significantly increased in microglia lacking gelsolin, a key actin-severing protein. Together, the dynamic state of the actin cytoskeleton profoundly and distinctly affects microglia behaviours. Disruption of actin dynamics attenuates M2 polarization by inhibiting transcription of alternative activation genes. In classical activation, the role of actin remodelling is complex, does not relate to gene transcription and shows a major divergence between cytokines following conventional and unconventional secretion.
Collapse
Affiliation(s)
- Ria Uhlemann
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Karen Gertz
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany.,Klinik und Poliklinik für Neurologie and Center for Stroke Research Berlin (CSB), Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Wolfgang Boehmerle
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Tobias Schwarz
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Christiane Nolte
- Cellular Neuroscience, Max-Delbruck-Center for Molecular Medicine, 13092, Berlin-Buch, Germany
| | - Dorette Freyer
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany
| | - Helmut Kettenmann
- Cellular Neuroscience, Max-Delbruck-Center for Molecular Medicine, 13092, Berlin-Buch, Germany
| | - Matthias Endres
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany. .,Klinik und Poliklinik für Neurologie and Center for Stroke Research Berlin (CSB), Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany. .,Excellence Cluster NeuroCure, 10117, Berlin, Germany. .,German Center for Cardiovascular Research (DZHK), 13347, Berlin, Germany.
| | - Golo Kronenberg
- Klinik und Hochschulambulanz für Neurologie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany. .,Klinik und Poliklinik für Neurologie and Center for Stroke Research Berlin (CSB), Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany. .,Klinik und Poliklinik für Psychiatrie und Psychotherapie, Charité Universitätsmedizin Berlin, 10117, Berlin, Germany.
| |
Collapse
|
88
|
González-González MA, Ostos-Valverde A, Becerra-Hernández A, Sánchez-Castillo H, Martínez-Torres A. The effect of carmustine on Bergmann cells of the cerebellum. Neurosci Lett 2015; 595:18-24. [PMID: 25841791 DOI: 10.1016/j.neulet.2015.03.068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 03/21/2015] [Accepted: 03/31/2015] [Indexed: 11/15/2022]
Abstract
Administration of the alkylating agent carmustine to pregnant mice induces hyperlocomotion in the offspring. Motor performance was evaluated by the rotarod task, which revealed that these animals have diminished Grab Frequency and a higher Performance Index, whereas Error of Latency and Latency to Fall were unaffected. Considering the recently revealed role of Bergmann cells of cerebellum in the control of motor activity, we used the transgenic mice GFAP-GFP to explore the impact of carmustine on the organization of these glial cells. Multiple examples of cell layer disorganization were detected; many soma of Bergmann cells were displaced to the external cell layer, and their processes were not well defined until young adulthood. In addition, the roof of the fourth ventricle was convoluted. These observations suggest that the exacerbated locomotion induced by carmustine may be due, in part, to the altered organization of the cell layers of cerebellum.
Collapse
Affiliation(s)
- María Alejandra González-González
- Departamento de Neurobiología Celular y Molecular, Laboratorio de Neurobiología Molecular y Celular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, 76230 Querétaro, Qro, Mexico
| | - Aline Ostos-Valverde
- Laboratory of Neuropsychopharmacology and Timing, School of Psychology, UNAM, Building B, B001, Mexico City 04510, Mexico
| | - Armando Becerra-Hernández
- Departamento de Neurobiología Celular y Molecular, Laboratorio de Neurobiología Molecular y Celular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, 76230 Querétaro, Qro, Mexico
| | - Hugo Sánchez-Castillo
- Laboratory of Neuropsychopharmacology and Timing, School of Psychology, UNAM, Building B, B001, Mexico City 04510, Mexico
| | - Ataúlfo Martínez-Torres
- Departamento de Neurobiología Celular y Molecular, Laboratorio de Neurobiología Molecular y Celular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Juriquilla, 76230 Querétaro, Qro, Mexico.
| |
Collapse
|
89
|
Kuan YH, Shih HC, Tang SC, Jeng JS, Shyu BC. Targeting P(2)X(7) receptor for the treatment of central post-stroke pain in a rodent model. Neurobiol Dis 2015; 78:134-45. [PMID: 25836422 DOI: 10.1016/j.nbd.2015.02.028] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 12/26/2014] [Accepted: 02/13/2015] [Indexed: 12/11/2022] Open
Abstract
Stroke is a leading cause of death and disability in industrialized countries. Approximately 8-14% of stroke survivors suffer from central post-stroke pain (CPSP) when hemorrhagic stroke occurs in lateral thalamic regions, which severely affects their quality of life. Because the mechanisms of CPSP are not well understood, effective treatments have not been developed. In the present study, we tested the hypothesis that persistent CPSP is caused by P(2)X(7)receptor activation after brain tissue damage and subsequent elevations in inflammatory cytokines. A thalamic hemorrhagic rat model was used, characterized by thermal and mechanical allodynia that develops in the subacute to chronic phases upon CPSP onset. We found a significant increase in P(2)X(7) expression in reactive microglia/macrophages in thalamic peri-lesion tissues at 5 weeks post-hemorrhage. Thalamic P(2)X(7) receptors were directly involved in pain transmission and hypersensitivity. The systemic targeting of P(2)X(7) receptors during the acute stage of hemorrhage rescued abnormal pain behaviors and neuronal activity in the thalamocingulate pathway by reducing reactive microglia/macrophage aggregation and associated inflammatory cytokines. After CPSP onset, the targeting of interleukin-1β reversed abnormal pain sensitivity. The aberrant spontaneous thalamocortical oscillations in rats with CPSP were modulated by blocking P(2)X(7) receptors. Taken together, our results suggest that targeting P(2)X(7) may be bi-effective in the treatment of CPSP, as both a pain blocker and immunosuppressant that inhibits inflammatory damage to brain tissue. P(2)X(7)receptors may serve as a potential target to prevent the occurrence of CPSP and may be beneficial for the recovery of patients from stroke.
Collapse
Affiliation(s)
- Yung-Hui Kuan
- Division of Neuroscience, Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan, ROC
| | - Hsi-Chien Shih
- Division of Neuroscience, Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan, ROC
| | - Sung-Chun Tang
- Department of Neurology and Stroke Center, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10051, Taiwan, ROC
| | - Jiann-Shing Jeng
- Department of Neurology and Stroke Center, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei 10051, Taiwan, ROC
| | - Bai-Chuang Shyu
- Division of Neuroscience, Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan, ROC.
| |
Collapse
|
90
|
Migration and Phagocytic Ability of Activated Microglia During Post-natal Development is Mediated by Calcium-Dependent Purinergic Signalling. Mol Neurobiol 2015; 53:944-954. [PMID: 25575683 DOI: 10.1007/s12035-014-9064-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Accepted: 12/09/2014] [Indexed: 01/10/2023]
Abstract
Microglia play an important role in synaptic pruning and controlled phagocytosis of neuronal cells during developmental stages. However, the mechanisms that regulate these functions are not completely understood. The present study was designed to investigate the role of purinergic signalling in microglial migration and phagocytic activity during post-natal brain development. One-day-old BALB/c mice received lipopolysaccharide (LPS) and/or a purinergic analogue (2-methylthioladenosine-5'-diphosphate; 2MeSADP), intracerebroventrically (i.c.v.). Combined administration of LPS and 2MeSADP resulted in activation of microglia as evident from increased expression of ionised calcium-binding adapter molecule 1 (Iba1). Activated microglia showed increased expression of purinergic receptors (P2Y2, P2Y6 and P2Y12). LPS either alone or in combination with 2MeSADP induced the expression of Na(+)/Ca(2+) exchanger (NCX-1) and P/Q-type Ca(2+) channels along with MARCKS-related protein (MRP), which is an integral component of cell migration machinery. In addition, LPS and 2MeSADP administration induced the expression of microglial CD11b and DAP12 (DNAX-activation protein 12), which are known to be involved in phagocytosis of neurons during development. Interestingly, administration of thapsigargin (TG), a specific Ca(2+)-ATPase inhibitor of endoplasmic reticulum, prevented the LPS/2MeSADP-induced microglial activation and migration by down-regulating the expression of Iba1 and MRP, respectively. Moreover, TG also reduced the LPS/2MeSADP-induced expression of CD11b/DAP12. Taken together, the findings reveal for the first time that Ca(2+)-mediated purinergic receptors regulate the migration and phagocytic ability of microglia during post-natal brain development.
Collapse
|
91
|
Sun Y, Chauhan A, Sukumaran P, Sharma J, Singh BB, Mishra BB. Inhibition of store-operated calcium entry in microglia by helminth factors: implications for immune suppression in neurocysticercosis. J Neuroinflammation 2014; 11:210. [PMID: 25539735 PMCID: PMC4302716 DOI: 10.1186/s12974-014-0210-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Accepted: 11/29/2014] [Indexed: 12/13/2022] Open
Abstract
Background Neurocysticercosis (NCC) is a disease of the central nervous system (CNS) caused by the cestode Taenia solium. The infection exhibits a long asymptomatic phase, typically lasting 3 to 5 years, before the onset of the symptomatic phase. The severity of the symptoms is thought to be associated with the intensity of the inflammatory response elicited by the degenerating parasite. In contrast, the asymptomatic phase shows an absence of brain inflammation, which is presumably due to immunosuppressive effects of the live parasites. However, the host factors and/or pathways involved in inhibiting inflammation remain largely unknown. Recently, using an animal model of NCC in which mice were intracranially inoculated with a related helminth parasite, Mesocestoides corti, we reported that Toll-like receptor (TLR)-associated signaling contributes to the development of the inflammatory response. As microglia shape the initial innate immune response in the CNS, we hypothesized that the negative regulation of a TLR-induced inflammatory pathway in microglia may be a novel helminth-associated immunosuppressive mechanism in NCC. Methods and results Here we report that helminth soluble factors (HSFs) from Mesocestoides corti inhibited TLR ligation-induced production of inflammatory cytokines in primary microglia. This was correlated with an inhibition of TLR-initiated upregulation of both phosphorylation and acetylation of the nuclear factor κB (NF-κB) p65 subunit, as well as phosphorylation of JNK and ERK1/2. As Ca2+ influx due to store-operated Ca2+ entry (SOCE) has been implicated in induction of downstream signaling, we tested the inhibitory effect of HSFs on agonist-induced Ca2+ influx and specific Ca2+ channel activation. We discovered that HSFs abolished the lipopolysaccharide (LPS)- or thapsigargin (Tg)-induced increase in intracellular Ca2+ accumulation by blocking the ER store release and SOCE. Moreover, electrophysiological recordings demonstrated HSF-mediated inhibition of LPS- or Tg-induced SOCE currents through both TRPC1 and ORAI1 Ca2+ channels on plasma membrane. This was correlated with a decrease in the TRPC1-STIM1 and ORAI1-STIM1 clustering at the plasma membrane that is essential for sustained Ca2+ entry through these channels. Conclusion Inhibition of TRPC1 and ORAI1 Ca2+ channel-mediated activation of NF-κB and MAPK pathways in microglia is likely a novel helminth-induced immunosuppressive mechanism that controls initiation of inflammatory response in the CNS.
Collapse
|
92
|
Heo DK, Lim HM, Nam JH, Lee MG, Kim JY. Regulation of phagocytosis and cytokine secretion by store-operated calcium entry in primary isolated murine microglia. Cell Signal 2014; 27:177-86. [PMID: 25451082 DOI: 10.1016/j.cellsig.2014.11.003] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 10/17/2014] [Accepted: 11/03/2014] [Indexed: 02/06/2023]
Abstract
Microglia are immune effector cells in the central nervous system that participate in tissue repair, inflammatory responses, and neuronal degeneration. The most important signaling factor in the differentiation of immune-active cells after stimulation is the sustained high calcium concentration in the cytosol, which is called store-operated calcium entry (SOCE). Recently, the molecular identity of the store-operated channel (SOC) has revealed that Orai1, Orai2, Orai3, Stim1, and Stim2 constitute the most of SOC. In this study, we demonstrate that Orai1- and Stim1-mediated SOC regulated the phagocytic activity and cytokine release of primary isolated murine microglia. RT-PCR analysis revealed that primary cultured microglia from neonatal ICR mouse brains had Orai1, Orai2, Orai3, and Stim1. To elucidate the role of SOCE in the immune functions of microglia, pharmacological inhibitors or knockdown with Orai1 or Stim1 siRNA was applied, and UDP-induced phagocytic activity and LPS-induced cytokine secretion activity were compared. The pharmacological inhibition and siRNA effect was verified by measuring thapsigargin (TG)-, ATP-, or UDP-activated SOCE Ca2+ influx and proper siRNA-mediated knockdown was verified by western blot analysis. UDP-induced phagocytic activity was inhibited by pharmacological inhibitors of SOCE, such as SKF96365 or 2-APB, and knockdown of Orai1 and Stim1. Cytokine secretion of TNF-α and IL-6 by LPS treatment was also inhibited by SKF96365 and knockdown of Orai1 and Stim1. Meanwhile, LPS stimulation-induced NF-κB activation was not altered, but NFAT1 activity was attenuated with Stim1 knockdown. These results indicate that SOCE, which was composed of Orais and Stim1, regulates UDP-induced phagocytosis and LPS-stimulated cytokine secretion in microglia.
Collapse
Affiliation(s)
- Dae Keon Heo
- Department of Pharmacology and Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea
| | - Hye Min Lim
- Department of Pharmacology and Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea
| | - Joo Hyun Nam
- Department of Physiology, Dongguk University College of Medicine, Gyeongju 780-714, Republic of Korea; Channelopathy Research Center, Dongguk University College of Medicine, Goyang 410-773, Republic of Korea
| | - Min Goo Lee
- Department of Pharmacology and Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea
| | - Joo Young Kim
- Department of Pharmacology and Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul 120-752, Republic of Korea.
| |
Collapse
|
93
|
Mizoguchi Y, Kato TA, Horikawa H, Monji A. Microglial intracellular Ca(2+) signaling as a target of antipsychotic actions for the treatment of schizophrenia. Front Cell Neurosci 2014; 8:370. [PMID: 25414641 PMCID: PMC4220695 DOI: 10.3389/fncel.2014.00370] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 10/20/2014] [Indexed: 11/18/2022] Open
Abstract
Microglia are resident innate immune cells which release many factors including proinflammatory cytokines, nitric oxide (NO) and neurotrophic factors when they are activated in response to immunological stimuli. Recent reports show that pathophysiology of schizophrenia is related to the inflammatory responses mediated by microglia. Intracellular Ca2+ signaling, which is mainly controlled by the endoplasmic reticulum (ER), is important for microglial functions such as release of NO and cytokines, migration, ramification and deramification. In addition, alteration of intracellular Ca2+ signaling underlies the pathophysiology of schizophrenia, while it remains unclear how typical or atypical antipsychotics affect intracellular Ca2+ mobilization in microglial cells. This mini-review article summarizes recent findings on cellular mechanisms underlying the characteristic differences in the actions of antipsychotics on microglial intracellular Ca2+ signaling and reinforces the importance of the ER of microglial cells as a target of antipsychotics for the treatment of schizophrenia.
Collapse
Affiliation(s)
- Yoshito Mizoguchi
- Department of Psychiatry, Faculty of Medicine, Saga University Saga, Japan
| | - Takahiro A Kato
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan ; Innovation Center for Medical Redox Navigation, Kyushu University Fukuoka, Japan
| | - Hideki Horikawa
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University Fukuoka, Japan
| | - Akira Monji
- Department of Psychiatry, Faculty of Medicine, Saga University Saga, Japan
| |
Collapse
|
94
|
Persson AK, Estacion M, Ahn H, Liu S, Stamboulian-Platel S, Waxman SG, Black JA. Contribution of sodium channels to lamellipodial protrusion and Rac1 and ERK1/2 activation in ATP-stimulated microglia. Glia 2014; 62:2080-95. [PMID: 25043721 DOI: 10.1002/glia.22728] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 06/11/2014] [Accepted: 07/08/2014] [Indexed: 12/19/2022]
Abstract
Microglia are motile resident immune cells of the central nervous system (CNS) that continuously explore their territories for threats to tissue homeostasis. Following CNS insult (e.g., cellular injury, infection, or ischemia), microglia respond to signals such as ATP, transform into an activated state, and migrate towards the threat. Directed migration is a complex and highly-coordinated process involving multiple intersecting cellular pathways, including signal transduction, membrane adhesion and retraction, cellular polarization, and rearrangement of cytoskeletal elements. We previously demonstrated that the activity of sodium channels contributes to ATP-induced migration of microglia. Here we show that TTX-sensitive sodium channels, specifically NaV 1.6, participate in an initial event in the migratory process, i.e., the formation in ATP-stimulated microglia of polymerized actin-rich membrane protrusions, lamellipodia, containing accumulations of Rac1 and phosphorylated ERK1/2. We also examined Ca(2+) transients in microglia and found that blockade of sodium channels with TTX produced a downward shift in the level of [Ca(2+) ]i during the delayed, slower recovery of [Ca(2+) ]i following ATP stimulation. These observations demonstrate a modulatory role of sodium channels on Ca(2+) transients in microglia that are likely to affect down-stream signaling cascades. Consistent with these observations, we demonstrate that ATP-induced microglial migration is mediated via Rac1 and ERK1/2, but not p38α/β and JNK, dependent pathways, and that activation of both Rac1 and ERK1/2 is modulated by sodium channel activity. Our results provide evidence for a direct link between sodium channel activity and modulation of Rac1 and ERK1/2 activation in ATP-stimulated microglia, possibly by regulating Ca(2+) transients.
Collapse
Affiliation(s)
- Anna-Karin Persson
- Department of Neurology and Center for Neuroscience and Regeneration Research, Yale University School of Medicine, New Haven, Connecticut; Rehabilitation Research Center, VA Connecticut Healthcare System, West Haven, Connecticut
| | | | | | | | | | | | | |
Collapse
|
95
|
Luongo L, Guida F, Imperatore R, Napolitano F, Gatta L, Cristino L, Giordano C, Siniscalco D, Di Marzo V, Bellini G, Petrelli R, Cappellacci L, Usiello A, de Novellis V, Rossi F, Maione S. The A1 adenosine receptor as a new player in microglia physiology. Glia 2014; 62:122-32. [PMID: 24272707 DOI: 10.1002/glia.22592] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 10/02/2013] [Accepted: 10/14/2013] [Indexed: 02/05/2023]
Abstract
The purinergic system is highly involved in the regulation of microglial physiological processes. In addition to the accepted roles for the P2 X4,7 and P2 Y12 receptors activated by adenosine triphosphate (ATP) and adenosine diphosphate, respectively, recent evidence suggests a role for the adenosine A2A receptor in microglial cytoskeletal rearrangements. However, the expression and function of adenosine A1 receptor (A1AR) in microglia is still unclear. Several reports have demonstrated possible expression of A1AR in microglia, but a new study has refuted such evidence. In this study, we investigated the presence and function of A1AR in microglia using biomolecular techniques, live microscopy, live calcium imaging, and in vivo electrophysiological approaches. The aim of this study was to clarify the expression of A1AR in microglia and to highlight its possible roles. We found that microglia express A1AR and that it is highly upregulated upon ATP treatment. Moreover, we observed that selective stimulation of A1AR inhibits the morphological activation of microglia, possibly by suppressing the Ca(2+) influx induced by ATP treatment. Finally, we recorded the spontaneous and evoked activity of spinal nociceptive-specific neuron before and after application of resting or ATP-treated microglia, with or without preincubation with a selective A1AR agonist. We found that the microglial cells, pretreated with the A1AR agonist, exhibit lower capability to facilitate the nociceptive neurons, as compared with the cells treated with ATP alone.
Collapse
Affiliation(s)
- L Luongo
- Department of Experimental Medicine, Division of Pharmacology "L. Donatelli", Second University of Naples, 80138, Naples, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
96
|
Hyperforin attenuates microglia activation and inhibits p65-Ser276 NFκB phosphorylation in the rat piriform cortex following status epilepticus. Neurosci Res 2014; 85:39-50. [PMID: 24881563 DOI: 10.1016/j.neures.2014.05.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/16/2014] [Accepted: 05/21/2014] [Indexed: 01/23/2023]
Abstract
Hyperforin, a lipophilic constituent of medicinal herb St. John's Wort, has neurobiological effects including antidepressant activity, antibiotic potency, anti-inflammatory activity and anti-tumoral properties. Furthermore, hyperforin activates transient receptor potential conical channel-6 (TRPC6), a nonselective cation channel. To elucidate the roles of hyperforin and TRPC6 in neuroinflammation in vivo, we investigated the effect of hyperforin on neuroinflammatory responses and its related events in the rat piriform cortex (PC) following status epilepticus (SE). Hyperforin attenuated microglial activation, p65-serine 276 NFκB phosphorylation, and suppressed TNF-α expression in the PC following SE. Hyperforin also effectively alleviated SE-induced vasogenic edema formation, neuronal damage, microglial TRPC6 induction and blood-derived monocyte infiltration. Our findings suggest that hyperforin may effectively attenuate microglia-mediated neuroinflammation in the TRPC6-independent manner.
Collapse
|
97
|
De Bock M, Decrock E, Wang N, Bol M, Vinken M, Bultynck G, Leybaert L. The dual face of connexin-based astroglial Ca(2+) communication: a key player in brain physiology and a prime target in pathology. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2014; 1843:2211-32. [PMID: 24768716 DOI: 10.1016/j.bbamcr.2014.04.016] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 04/11/2014] [Accepted: 04/12/2014] [Indexed: 12/21/2022]
Abstract
For decades, studies have been focusing on the neuronal abnormalities that accompany neurodegenerative disorders. Yet, glial cells are emerging as important players in numerous neurological diseases. Astrocytes, the main type of glia in the central nervous system , form extensive networks that physically and functionally connect neuronal synapses with cerebral blood vessels. Normal brain functioning strictly depends on highly specialized cellular cross-talk between these different partners to which Ca(2+), as a signaling ion, largely contributes. Altered intracellular Ca(2+) levels are associated with neurodegenerative disorders and play a crucial role in the glial responses to injury. Intracellular Ca(2+) increases in single astrocytes can be propagated toward neighboring cells as intercellular Ca(2+) waves, thereby recruiting a larger group of cells. Intercellular Ca(2+) wave propagation depends on two, parallel, connexin (Cx) channel-based mechanisms: i) the diffusion of inositol 1,4,5-trisphosphate through gap junction channels that directly connect the cytoplasm of neighboring cells, and ii) the release of paracrine messengers such as glutamate and ATP through hemichannels ('half of a gap junction channel'). This review gives an overview of the current knowledge on Cx-mediated Ca(2+) communication among astrocytes as well as between astrocytes and other brain cell types in physiology and pathology, with a focus on the processes of neurodegeneration and reactive gliosis. Research on Cx-mediated astroglial Ca(2+) communication may ultimately shed light on the development of targeted therapies for neurodegenerative disorders in which astrocytes participate. This article is part of a Special Issue entitled: Calcium signaling in health and disease. Guest Editors: Geert Bultynck, Jacques Haiech, Claus W. Heizmann, Joachim Krebs, and Marc Moreau.
Collapse
Affiliation(s)
- Marijke De Bock
- Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
| | - Elke Decrock
- Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium.
| | - Nan Wang
- Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
| | - Mélissa Bol
- Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
| | - Mathieu Vinken
- Department of Toxicology, Center for Pharmaceutical Research, Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, B-1090 Brussels, Belgium
| | - Geert Bultynck
- Department of Cellular and Molecular Medicine, Laboratory of Molecular and Cellular Signalling, KULeuven, Campus Gasthuisberg O/N-I bus 802, B-3000 Leuven, Belgium
| | - Luc Leybaert
- Department of Basic Medical Sciences, Physiology group, Faculty of Medicine and Health Sciences, Ghent University, B-9000 Ghent, Belgium
| |
Collapse
|
98
|
Brawek B, Schwendele B, Riester K, Kohsaka S, Lerdkrai C, Liang Y, Garaschuk O. Impairment of in vivo calcium signaling in amyloid plaque-associated microglia. Acta Neuropathol 2014; 127:495-505. [PMID: 24407428 DOI: 10.1007/s00401-013-1242-2] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 12/20/2013] [Accepted: 12/30/2013] [Indexed: 11/26/2022]
Abstract
Neuroinflammation is a hallmark of Alzheimer's disease (AD) both in man and in multiple mouse models, and epidemiological studies link the use of anti-inflammatory drugs with a reduced risk of developing the disease. AD-related neuroinflammation is largely mediated by microglia, the main immune cells of the central nervous system. In vitro, executive functions of microglia are regulated by intracellular Ca(2+) signals, but little is known about microglial Ca(2+) signaling in vivo. Here we analyze in vivo properties of these cells in two mouse models of AD. In both strains plaque-associated microglia had hypertrophic/amoeboid morphology and were strongly positive for markers of activation such as CD11b and CD68. Activated microglia failed to respond reliably to extracellular release of adenosine triphosphate (ATP, mimicking tissue damage) and showed an increased incidence of spontaneous intracellular Ca(2+) transients. These Ca(2+) transients required activation of ATP receptors and Ca(2+) release from the intracellular Ca(2+) stores, and were not induced by neuronal or astrocytic hyperactivity. Neuronal silencing, however, selectively increased the frequency of Ca(2+) transients in plaque-associated microglia. Thus, our in vivo data reveal substantial dysfunction of plaque-associated microglia and identify a novel Ca(2+) signal possibly triggering a Ca(2+)-dependent release of toxic species in the plaque vicinity.
Collapse
Affiliation(s)
- Bianca Brawek
- Institute of Physiology II, Eberhard Karls University of Tuebingen, Keplerstr. 15, 72074, Tuebingen, Germany
| | | | | | | | | | | | | |
Collapse
|
99
|
Network-wide dysregulation of calcium homeostasis in Alzheimer’s disease. Cell Tissue Res 2014; 357:427-38. [DOI: 10.1007/s00441-014-1798-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Accepted: 01/09/2014] [Indexed: 12/19/2022]
|
100
|
Miyake T, Shirakawa H, Kusano A, Sakimoto S, Konno M, Nakagawa T, Mori Y, Kaneko S. TRPM2 contributes to LPS/IFNγ-induced production of nitric oxide via the p38/JNK pathway in microglia. Biochem Biophys Res Commun 2014; 444:212-7. [DOI: 10.1016/j.bbrc.2014.01.022] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Accepted: 01/11/2014] [Indexed: 11/30/2022]
|