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Nicot AB, Harb J, Garcia A, Guillot F, Mai HL, Mathé CV, Morille J, Vallino A, Dugast E, Shah SP, Lefrère F, Moyon M, Wiertlewski S, Le Berre L, Renaudin K, Soulillou JP, van Pesch V, Brouard S, Berthelot L, Laplaud DA. Aglycosylated extracellular loop of inwardly rectifying potassium channel 4.1 (KCNJ10) provides a target for autoimmune neuroinflammation. Brain Commun 2023; 5:fcad044. [PMID: 36910419 PMCID: PMC9994600 DOI: 10.1093/braincomms/fcad044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 09/20/2022] [Accepted: 02/21/2023] [Indexed: 02/25/2023] Open
Abstract
Multiple sclerosis is an autoimmune disease of the central nervous system. Yet, the autoimmune targets are still undefined. The extracellular e1 sequence of KCNJ10, the inwardly rectifying potassium channel 4.1, has been subject to fierce debate for its role as a candidate autoantigen in multiple sclerosis. Inwardly rectifying potassium channel 4.1 is expressed in the central nervous system but also in peripheral tissues, raising concerns about the central nervous system-specificity of such autoreactivity. Immunization of C57Bl6/J female mice with the e1 peptide (amino acids 83-120 of Kir4.1) induced anti-e1 immunoglobulin G- and T-cell responses and promoted demyelinating encephalomyelitis with B cell central nervous system enrichment in leptomeninges and T cells/macrophages in central nervous system parenchyma from forebrain to spinal cord, mostly in the white matter. Within our cohort of multiple sclerosis patients (n = 252), 6% exhibited high anti-e1 immunoglobulin G levels in serum as compared to 0.7% in the control cohort (n = 127; P = 0.015). Immunolabelling of inwardly rectifying potassium channel 4.1-expressing white matter glia with the anti-e1 serum from immunized mice increased during murine autoimmune neuroinflammation and in multiple sclerosis white matter as compared with controls. Strikingly, the mouse and human anti-e1 sera labelled astrocytoma cells when N-glycosylation was blocked with tunicamycin. Western blot confirmed that neuroinflammation induces Kir4.1 expression, including its shorter aglycosylated form in murine experimental autoencephalomyelitis and multiple sclerosis. In addition, recognition of inwardly rectifying potassium channel 4.1 using mouse anti-e1 serum in Western blot experiments under unreduced conditions or in cells transfected with the N-glycosylation defective N104Q mutant as compared to the wild type further suggests that autoantibodies target an e1 conformational epitope in its aglycosylated form. These data highlight the e1 sequence of inwardly rectifying potassium channel 4.1 as a valid central nervous system autoantigen with a disease/tissue-specific post-translational antigen modification as potential contributor to autoimmunity in some multiple sclerosis patients.
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Affiliation(s)
- Arnaud B Nicot
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Jean Harb
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Alexandra Garcia
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Flora Guillot
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Hoa-Le Mai
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Camille V Mathé
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Jérémy Morille
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Amélie Vallino
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Emilie Dugast
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Sita P Shah
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Fabienne Lefrère
- Service de Neurologie, CHU Nantes, Nantes 44000, France.,CIC Inserm 1413, CHU Nantes, Nantes 44000, France
| | - Mélinda Moyon
- Service de Neurologie, CHU Nantes, Nantes 44000, France.,CIC Inserm 1413, CHU Nantes, Nantes 44000, France
| | - Sandrine Wiertlewski
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France.,Service de Neurologie, CHU Nantes, Nantes 44000, France.,CIC Inserm 1413, CHU Nantes, Nantes 44000, France
| | - Ludmilla Le Berre
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Karine Renaudin
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Jean-Paul Soulillou
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Vincent van Pesch
- Neurologie, Institute of Neuroscience, Université Catholique de Louvain, Bruxelles 1200, Belgium
| | - Sophie Brouard
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - Laureline Berthelot
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France
| | - David-Axel Laplaud
- INSERM, Nantes Université, CHU Nantes, Center for Research in Transplantation and Translational Immunology (CR2TI), UMR 1064, Nantes 44000, France.,Service de Neurologie, CHU Nantes, Nantes 44000, France.,CIC Inserm 1413, CHU Nantes, Nantes 44000, France
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Gao F, Yang S, Wang J, Zhu G. cAMP-PKA cascade: An outdated topic for depression? Biomed Pharmacother 2022; 150:113030. [PMID: 35486973 DOI: 10.1016/j.biopha.2022.113030] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/18/2022] [Accepted: 04/21/2022] [Indexed: 11/02/2022] Open
Abstract
Depression is a common neuropsychiatric disorder characterized by persistent depressed mood and causes serious socioeconomic burden worldwide. Hyperactivity of the hypothalamic-pituitary-adrenal (HPA) axis, deficiency of monoamine transmitters, neuroinflammation and abnormalities of the gut flora are strongly associated with the onset of depression. The cyclic AMP (cAMP)/protein kinase A (PKA) cascade, a major cross-species cellular signaling pathway, is supposed as important player and regulator of depression onset by controlling synaptic plasticity, cytokinesis, transcriptional regulation and HPA axis. In the central nervous system, the cAMP-PKA cascade can dynamically shape neural circuits by enhancing synaptic plasticity, and affect K+ channels by phosphorylating Kir4.1, thereby regulating neuronal excitation. The reduction of cAMP-PKA cascade affects neuronal excitation as well as synaptic plasticity, ultimately leading to pathological outcome of depression, while activation of cAMP-PKA cascade would provide a rapid antidepressant effect. In this review, we proposed to reconsider the function of cAMP-PKA cascade, especially in the rapid antidepressant effect. Local activation or indirect activation of PKA through adjusting anchor proteins would provide new idea for acute treatment of depression.
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Affiliation(s)
- Feng Gao
- Key Laboratory of Xin'an Medicine, the Ministry of Education and Key Laboratory of Molecular Biology (Brain diseases), Anhui University of Chinese Medicine, Hefei 230012, China
| | - Shaojie Yang
- Key Laboratory of Xin'an Medicine, the Ministry of Education and Key Laboratory of Molecular Biology (Brain diseases), Anhui University of Chinese Medicine, Hefei 230012, China
| | - Juan Wang
- Key Laboratory of Xin'an Medicine, the Ministry of Education and Key Laboratory of Molecular Biology (Brain diseases), Anhui University of Chinese Medicine, Hefei 230012, China
| | - Guoqi Zhu
- Key Laboratory of Xin'an Medicine, the Ministry of Education and Key Laboratory of Molecular Biology (Brain diseases), Anhui University of Chinese Medicine, Hefei 230012, China.
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Olude MA, Mouihate A, Mustapha OA, Farina C, Quintana FJ, Olopade JO. Astrocytes and Microglia in Stress-Induced Neuroinflammation: The African Perspective. Front Immunol 2022; 13:795089. [PMID: 35707531 PMCID: PMC9190229 DOI: 10.3389/fimmu.2022.795089] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 04/13/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Africa is laden with a youthful population, vast mineral resources and rich fauna. However, decades of unfortunate historical, sociocultural and leadership challenges make the continent a hotspot for poverty, indoor and outdoor pollutants with attendant stress factors such as violence, malnutrition, infectious outbreaks and psychological perturbations. The burden of these stressors initiate neuroinflammatory responses but the pattern and mechanisms of glial activation in these scenarios are yet to be properly elucidated. Africa is therefore most vulnerable to neurological stressors when placed against a backdrop of demographics that favor explosive childbearing, a vast population of unemployed youths making up a projected 42% of global youth population by 2030, repressive sociocultural policies towards women, poor access to healthcare, malnutrition, rapid urbanization, climate change and pollution. Early life stress, whether physical or psychological, induces neuroinflammatory response in developing nervous system and consequently leads to the emergence of mental health problems during adulthood. Brain inflammatory response is driven largely by inflammatory mediators released by glial cells; namely astrocytes and microglia. These inflammatory mediators alter the developmental trajectory of fetal and neonatal brain and results in long-lasting maladaptive behaviors and cognitive deficits. This review seeks to highlight the patterns and mechanisms of stressors such as poverty, developmental stress, environmental pollutions as well as malnutrition stress on astrocytes and microglia in neuroinflammation within the African context.
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Affiliation(s)
- Matthew Ayokunle Olude
- Vertebrate Morphology, Environmental Toxicology and Neuroscience Unit, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Nigeria
- *Correspondence: Matthew Ayokunle Olude,
| | - Abdeslam Mouihate
- Department of Physiology, Faculty of Medicine, Health Sciences Centre, Kuwait University, Kuwait City, Kuwait
| | - Oluwaseun Ahmed Mustapha
- Vertebrate Morphology, Environmental Toxicology and Neuroscience Unit, College of Veterinary Medicine, Federal University of Agriculture, Abeokuta, Nigeria
| | - Cinthia Farina
- Istituto di Ricovero e Cura a Carattere Scientifico (IRCSS) San Raffaele Scientific Institute, Institute of Experimental Neurology (INSPE) and Division of Neuroscience, Milan, Italy
| | - Francisco Javier Quintana
- Ann Romney Center for Neurologic Diseases, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - James Olukayode Olopade
- Neuroscience Unit, Department of Veterinary Anatomy, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
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Schmaul S, Hanuscheck N, Bittner S. Astrocytic potassium and calcium channels as integrators of the inflammatory and ischemic CNS microenvironment. Biol Chem 2021; 402:1519-1530. [PMID: 34455729 DOI: 10.1515/hsz-2021-0256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 08/13/2021] [Indexed: 12/24/2022]
Abstract
Astrocytes are key regulators of their surroundings by receiving and integrating stimuli from their local microenvironment, thereby regulating glial and neuronal homeostasis. Cumulating evidence supports a plethora of heterogenic astrocyte subpopulations that differ morphologically and in their expression patterns of receptors, transporters and ion channels, as well as in their functional specialisation. Astrocytic heterogeneity is especially relevant under pathological conditions. In experimental autoimmune encephalomyelitis (EAE), a mouse model of multiple sclerosis (MS), morphologically distinct astrocytic subtypes were identified and could be linked to transcriptome changes during different disease stages and regions. To allow for continuous awareness of changing stimuli across age and diseases, astrocytes are equipped with a variety of receptors and ion channels allowing the precise perception of environmental cues. Recent studies implicate the diverse repertoire of astrocytic ion channels - including transient receptor potential channels, voltage-gated calcium channels, inwardly rectifying K+ channels, and two-pore domain potassium channels - in sensing the brain state in physiology, inflammation and ischemia. Here, we review current evidence regarding astrocytic potassium and calcium channels and their functional contribution in homeostasis, neuroinflammation and stroke.
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Affiliation(s)
- Samantha Schmaul
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Centre of the Johannes Gutenberg University Mainz, Langenbeckstraße 1, D-55131 Mainz, Germany
| | - Nicholas Hanuscheck
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Centre of the Johannes Gutenberg University Mainz, Langenbeckstraße 1, D-55131 Mainz, Germany
| | - Stefan Bittner
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Centre of the Johannes Gutenberg University Mainz, Langenbeckstraße 1, D-55131 Mainz, Germany
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Akyuz E, Koklu B, Uner A, Angelopoulou E, Paudel YN. Envisioning the role of inwardly rectifying potassium (Kir) channel in epilepsy. J Neurosci Res 2021; 100:413-443. [PMID: 34713909 DOI: 10.1002/jnr.24985] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 09/23/2021] [Accepted: 10/01/2021] [Indexed: 01/29/2023]
Abstract
Epilepsy is a devastating neurological disorder characterized by recurrent seizures attributed to the disruption of the dynamic excitatory and inhibitory balance in the brain. Epilepsy has emerged as a global health concern affecting about 70 million people worldwide. Despite recent advances in pre-clinical and clinical research, its etiopathogenesis remains obscure, and there are still no treatment strategies modifying disease progression. Although the precise molecular mechanisms underlying epileptogenesis have not been clarified yet, the role of ion channels as regulators of cellular excitability has increasingly gained attention. In this regard, emerging evidence highlights the potential implication of inwardly rectifying potassium (Kir) channels in epileptogenesis. Kir channels consist of seven different subfamilies (Kir1-Kir7), and they are highly expressed in both neuronal and glial cells in the central nervous system. These channels control the cell volume and excitability. In this review, we discuss preclinical and clinical evidence on the role of the several subfamilies of Kir channels in epileptogenesis, aiming to shed more light on the pathogenesis of this disorder and pave the way for future novel therapeutic approaches.
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Affiliation(s)
- Enes Akyuz
- Faculty of International Medicine, Department of Biophysics, University of Health Sciences, Istanbul, Turkey
| | - Betul Koklu
- Faculty of Medicine, Namık Kemal University, Tekirdağ, Turkey
| | - Arda Uner
- Faculty of Medicine, Yozgat Bozok University, Yozgat, Turkey
| | - Efthalia Angelopoulou
- Department of Biological Chemistry, Medical School, National and Kapodistrian University of Athens, Athens, Greece
| | - Yam Nath Paudel
- Neuropharmacology Research Strength, Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Malaysia
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