1
|
Yoon H, Gerdes LA, Beigel F, Sun Y, Kövilein J, Wang J, Kuhlmann T, Flierl-Hecht A, Haller D, Hohlfeld R, Baranzini SE, Wekerle H, Peters A. Multiple sclerosis and gut microbiota: Lachnospiraceae from the ileum of MS twins trigger MS-like disease in germfree transgenic mice-An unbiased functional study. Proc Natl Acad Sci U S A 2025; 122:e2419689122. [PMID: 40258140 PMCID: PMC12067282 DOI: 10.1073/pnas.2419689122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2024] [Accepted: 02/25/2025] [Indexed: 04/23/2025] Open
Abstract
We developed a two-tiered strategy aiming to identify gut bacteria functionally linked to the development of multiple sclerosis (MS). First, we compared gut microbial profiles in a cohort of 81 monozygotic twins discordant for MS. This approach allowed to minimize confounding effects by genetic and early environmental factors and identified over 50 differently abundant taxa with the majority of increased taxa within the Firmicutes. These included taxa previously described to be associated with MS (Anaerotruncus colihominis and Eisenbergiella tayi), along with newly identified taxa, such as Copromonas and Acutalibacter. Second, we interrogated the intestinal habitat and functional impact of individual taxa on the development of MS-like disease. In an exploratory approach, we enteroscopically sampled microbiota from different gut segments of selected twin pairs and compared their compositional profiles. To assess their functional potential, samples were orally transferred into germfree transgenic mice prone to develop spontaneous MS-like experimental autoimmune encephalomyelitis (EAE) upon bacterial colonization. We found that MS-derived ileal microbiota induced EAE at substantially higher rates than analogous material from healthy twin donors. Furthermore, female mice were more susceptible to disease development than males. The likely active organisms were identified as Eisenbergiella tayi and Lachnoclostridium, members of the Lachnospiraceae family. Our results identify potentially disease-facilitating bacteria sampled from the ileum of MS affected twins. The experimental strategy may pave the way to functionally understand the role of gut microbiota in initiation of MS.
Collapse
Affiliation(s)
- Hongsup Yoon
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Max Planck Institute for Biological Intelligence, Martinsried82152, Germany
| | - Lisa Ann Gerdes
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Munich Cluster of Systems Neurology, Munich81377, Germany
| | - Florian Beigel
- Department of Medicine II, University Hospital, Ludwig-Maximilians-Universität München, Munich81377, Germany
| | - Yihui Sun
- Weill Institute for Neurosciences, Department of Neurology, University of California San Francisco, San Francisco, CA94158
| | - Janine Kövilein
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Max Planck Institute for Biological Intelligence, Martinsried82152, Germany
| | - Jiancheng Wang
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried82152, Germany
| | - Tanja Kuhlmann
- Institute of Neuropathology, University Hospital Münster, Münster48153, Germany
| | - Andrea Flierl-Hecht
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
| | - Dirk Haller
- Zentralinstitut für Ernährungs- und Lebensmittelforschung Institute for Food and Health, Technical University of Munich, Freising85354, Germany
| | - Reinhard Hohlfeld
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
| | - Sergio E. Baranzini
- Weill Institute for Neurosciences, Department of Neurology, University of California San Francisco, San Francisco, CA94158
| | - Hartmut Wekerle
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Max Planck Institute for Biological Intelligence, Martinsried82152, Germany
| | - Anneli Peters
- Institute of Clinical Neuroimmunology, University Hospital Ludwig-Maximilians-Universität München, Martinsried82152, Germany
- Biomedical Center, Faculty of Medicine, Ludwig-Maximilians-Universität München, Martinsried82152, Germany
| |
Collapse
|
2
|
Prado C, Herrada AA, Hevia D, Goiry LG, Escobedo N. Role of innate immune cells in multiple sclerosis. Front Immunol 2025; 16:1540263. [PMID: 40034690 PMCID: PMC11872933 DOI: 10.3389/fimmu.2025.1540263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2024] [Accepted: 01/28/2025] [Indexed: 03/05/2025] Open
Abstract
Multiple sclerosis (MS) is a chronic autoimmune, inflammatory and neurodegenerative disease affecting the central nervous system (CNS). MS is associated with a complex interplay between neurodegenerative and inflammatory processes, mostly attributed to pathogenic T and B cells. However, a growing body of preclinical and clinical evidence indicates that innate immunity plays a crucial role in MS promotion and progression. Accordingly, preclinical and clinical studies targeting different innate immune cells to control MS are currently under study, highlighting the importance of innate immunity in this pathology. Here, we reviewed recent findings regarding the role played by innate immune cells in the pathogenesis of MS. Additionally, we discuss potential new treatments for MS based on targets against innate immune components.
Collapse
Affiliation(s)
- Carolina Prado
- Laboratorio de Neuroinmunología, Centro Científico y Tecnológico de Excelencia Ciencia & Vida, Fundación Ciencia & Vida, Santiago, Chile
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | - Andrés A. Herrada
- Lymphatic Vasculature and Inflammation Research Laboratory, Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Talca, Chile
| | - Daniel Hevia
- Center for Studies and Innovation in Dentistry, Facultad de Odontología, Universidad Finis Terrae, Santiago, Chile
| | - Lorna Galleguillos Goiry
- Neurology and Psychiatry Department, Clínica Alemana, Neurology and Neurosurgery Department, Clínica Dávila, Santiago, Chile
| | - Noelia Escobedo
- Lymphatic Vasculature and Inflammation Research Laboratory, Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Talca, Chile
| |
Collapse
|
3
|
Cummins MJ, Cresswell ET, Bevege RJ, Smith DW. Aging disrupts blood-brain and blood-spinal cord barrier homeostasis, but does not increase paracellular permeability. GeroScience 2025; 47:263-285. [PMID: 39476323 PMCID: PMC11872845 DOI: 10.1007/s11357-024-01404-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Accepted: 10/15/2024] [Indexed: 03/04/2025] Open
Abstract
Blood-CNS barriers protect the CNS from circulating immune cells and damaging molecules. It is thought barrier integrity becomes disrupted with aging, contributing to impaired CNS function. Using genome-wide and targeted molecular approaches, we found aging affected expression of predominantly immune invasion and pericyte-related genes in CNS regions investigated, especially after middle age, with spinal cord being most impacted. We did not find significant perturbation of endothelial cell junction genes or proteins, nor were vascular density or pericyte coverage affected by aging. We evaluated barrier paracellular permeability using small molecular weight tracers, serum protein extravasation, CNS water content, and iron labelling measures. We found no evidence for age-related increased barrier permeability in any of these tests. We conclude that blood-brain (BBB) and blood-spinal cord barrier (BSCB) paracellular permeability does not increase with normal aging in mouse. Whilst expression changes were not associated with increased permeability, they may represent an age-related primed state whereby additional insults cause increased leakiness.
Collapse
Affiliation(s)
- Mitchell J Cummins
- Neurobiology of Aging and Dementia Laboratory, School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, NSW, Australia
- Brain Neuromodulation Research Program, Hunter Medical Research Institute, New Lambton, NSW, Australia
- School of Biotechnology and Biomolecular Sciences, UNSW Sydney, Sydney, NSW, 2052, Australia
| | - Ethan T Cresswell
- Neurobiology of Aging and Dementia Laboratory, School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, NSW, Australia
- Brain Neuromodulation Research Program, Hunter Medical Research Institute, New Lambton, NSW, Australia
| | - Renee J Bevege
- Neurobiology of Aging and Dementia Laboratory, School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, NSW, Australia
- Brain Neuromodulation Research Program, Hunter Medical Research Institute, New Lambton, NSW, Australia
| | - Doug W Smith
- Neurobiology of Aging and Dementia Laboratory, School of Biomedical Sciences and Pharmacy, College of Health, Medicine and Wellbeing, University of Newcastle, Callaghan, NSW, Australia.
- Brain Neuromodulation Research Program, Hunter Medical Research Institute, New Lambton, NSW, Australia.
| |
Collapse
|
4
|
Baudron E, Docagne F, Vivien D, Bardou I. Early changes in intestinal lymphoid and myeloid populations in experimental autoimmune encephalomyelitis. Neuroscience 2025; 564:236-242. [PMID: 39581303 DOI: 10.1016/j.neuroscience.2024.11.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2024] [Revised: 11/12/2024] [Accepted: 11/19/2024] [Indexed: 11/26/2024]
Abstract
Intestinal immunity is associated with several autoimmune diseases, such as systemic lupus erythematosus, rheumatoid arthritis, and type 1 diabetes. Recent evidence also suggests its implication in the pathogenesis of autoimmune diseases affecting the central nervous system, such as multiple sclerosis (MS). However, there is ongoing debate regarding which part of the intestinal tract contributes to the development of MS. Therefore, our study aimed to explore the early changes in lymphoid and myeloid immune cells populations in experimental autoimmune encephalomyelitis (EAE), an animal model of MS. We also sought to determine the roles of the colon and/or small intestine in the pathogenesis of EAE. By using flow cytometry, we revealed a transient increase in T and B lymphocytes in the ileal lamina propria of EAE mice just before the onset of motor symptoms. Additionally, we highlighted an increase in dendritic cells and monocytes/macrophages in the colonic lamina propria of EAE animals during the presymptomatic phase. Altogether, our findings indicate that both small intestine and colon are involved in the pathogenesis of EAE, despite engaging distinct immunological processes. This study provides new insights for understanding the roles of intestinal lymphoid and myeloid immune cells on the pathogenesis of MS and other autoimmune diseases.
Collapse
Affiliation(s)
- Erwan Baudron
- Normandie Univ, UNICAEN, INSERM, PhIND "Physiopathology and Imaging of Neurological Disorders", Institut Blood and Brain @ Caen-Normandie, Cyceron, 14000, Caen, France
| | - Fabian Docagne
- Normandie Univ, UNICAEN, INSERM, PhIND "Physiopathology and Imaging of Neurological Disorders", Institut Blood and Brain @ Caen-Normandie, Cyceron, 14000, Caen, France
| | - Denis Vivien
- Normandie Univ, UNICAEN, INSERM, PhIND "Physiopathology and Imaging of Neurological Disorders", Institut Blood and Brain @ Caen-Normandie, Cyceron, 14000, Caen, France; Department of Clinical Research, CHU Côte de Nacre, Caen, France
| | - Isabelle Bardou
- Normandie Univ, UNICAEN, INSERM, PhIND "Physiopathology and Imaging of Neurological Disorders", Institut Blood and Brain @ Caen-Normandie, Cyceron, 14000, Caen, France.
| |
Collapse
|
5
|
Oluwagbemigun K, Anesi A, Vrhovsek U, Mattivi F, Martino Adami P, Pentzek M, Scherer M, Riedel-Heller SG, Weyerer S, Bickel H, Wiese B, Schmid M, Cryan JF, Ramirez A, Wagner M, Nöthlings U. An Investigation into the Relationship of Circulating Gut Microbiome Molecules and Inflammatory Markers with the Risk of Incident Dementia in Later Life. Mol Neurobiol 2024; 61:9776-9793. [PMID: 37605096 PMCID: PMC11584436 DOI: 10.1007/s12035-023-03513-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/15/2023] [Indexed: 08/23/2023]
Abstract
The gut microbiome may be involved in the occurrence of dementia primarily through the molecular mechanisms of producing bioactive molecules and promoting inflammation. Epidemiological evidence linking gut microbiome molecules and inflammatory markers to dementia risk has been mixed, and the intricate interplay between these groups of biomarkers suggests that their joint investigation in the context of dementia is warranted. We aimed to simultaneously investigate the association of circulating levels of selected gut microbiome molecules and inflammatory markers with dementia risk. This case-cohort epidemiological study included 805 individuals (83 years, 66% women) free of dementia at baseline. Plasma levels of 19 selected gut microbiome molecules comprising lipopolysaccharide, short-chain fatty acids, and indole-containing tryptophan metabolites as well as four inflammatory markers measured at baseline were linked to incident all-cause (ACD) and Alzheimer's disease dementia (AD) in binary outcomes and time-to-dementia analyses. Independent of several covariates, seven gut microbiome molecules, 5-hydroxyindole-3-acetic acid, indole-3-butyric acid, indole-3-acryloylglycine, indole-3-lactic acid, indole-3-acetic acid methyl ester, isobutyric acid, and 2-methylbutyric acid, but no inflammatory markers discriminated incident dementia cases from non-cases. Furthermore, 5-hydroxyindole-3-acetic acid (hazard ratio: 0.58; 0.36-0.94, P = 0.025) was associated with time-to-ACD. These molecules underpin gut microbiome-host interactions in the development of dementia and they may be crucial in its prevention and intervention strategies. Future larger epidemiological studies are needed to confirm our findings, specifically in exploring the repeatedly measured circulating levels of these molecules and investigating their causal relationship with dementia risk.
Collapse
Affiliation(s)
- Kolade Oluwagbemigun
- Nutritional Epidemiology, Department of Nutrition and Food Sciences, University of Bonn, 53115, Bonn, Germany.
| | - Andrea Anesi
- Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach (FEM), 38098, San Michele all'Adige, Italy
| | - Urska Vrhovsek
- Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach (FEM), 38098, San Michele all'Adige, Italy
| | - Fulvio Mattivi
- Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach (FEM), 38098, San Michele all'Adige, Italy
| | - Pamela Martino Adami
- Division of Neurogenetics and Molecular Psychiatry, Department of Psychiatry and Psychotherapy, Medical Faculty, University of Cologne, 50924, Cologne, Germany
| | - Michael Pentzek
- Institute of General Practice, University Hospital Essen, 45147, Essen, Germany
| | - Martin Scherer
- Department of Primary Medical Care, Center for Psychosocial Medicine, University Medical Center, 20246, Hamburg-Eppendorf, Germany
| | - Steffi G Riedel-Heller
- Institute of Social Medicine, Occupational Health and Public Health, University of Leipzig, 04103, Leipzig, Germany
| | - Siegfried Weyerer
- Medical Faculty Mannheim, Heidelberg University, 68167, Mannheim, Germany
| | - Horst Bickel
- Department of Psychiatry, Technical University of Munich, 80336, Munich, Germany
| | - Birgitt Wiese
- Institute of General Practice, Hannover Medical School, 30625, Hannover, Germany
| | - Matthias Schmid
- Institute for Medical Biometry, Informatics and Epidemiology, Faculty of Medicine, University of Bonn, 53127, Bonn, Germany
- German Center for Neurodegenerative Diseases, 53127, Bonn, Germany
| | - John F Cryan
- Department of Anatomy and Neuroscience, Western Gateway Building, University College Cork, Cork, T12 XF62, Ireland
| | - Alfredo Ramirez
- Division of Neurogenetics and Molecular Psychiatry, Department of Psychiatry and Psychotherapy, Medical Faculty, University of Cologne, 50924, Cologne, Germany
- German Center for Neurodegenerative Diseases, 53127, Bonn, Germany
- Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, 53127, Bonn, Germany
- Department of Psychiatry and Glenn Biggs Institute for Alzheimer's and Neurodegenerative Diseases, San Antonio, TX, 78229, USA
- Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, 50931, Cologne, Germany
| | - Michael Wagner
- German Center for Neurodegenerative Diseases, 53127, Bonn, Germany
- Department of Neurodegenerative Diseases and Geriatric Psychiatry, University Hospital Bonn, 53127, Bonn, Germany
| | - Ute Nöthlings
- Nutritional Epidemiology, Department of Nutrition and Food Sciences, University of Bonn, 53115, Bonn, Germany
| |
Collapse
|
6
|
Cheng J, Williams JP, Zhou L, Wang PC, Sun LN, Li RH, An JX. Ozone rectal insufflation mitigates chronic rapid eye movement sleep deprivation-induced cognitive impairment through inflammation alleviation and gut microbiota regulation in mice. Med Gas Res 2024; 14:213-224. [PMID: 39073330 PMCID: PMC11257187 DOI: 10.4103/mgr.medgasres-d-23-00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 11/22/2023] [Accepted: 10/20/2023] [Indexed: 07/30/2024] Open
Abstract
A range of sleep disorders has the potential to adversely affect cognitive function. This study was undertaken with the objective of investigating the effects of ozone rectal insufflation (O3-RI) on cognitive dysfunction induced by chronic REM sleep deprivation, as well as elucidating possible underlying mechanisms. O3-RI ameliorated cognitive dysfunction in chronic REM sleep deprived mice, improved the neuronal damage in the hippocampus region and decreased neuronal loss. Administration of O3-RI may protect against chronic REM sleep deprivation induced cognitive dysfunction by reversing the abnormal expression of Occludin and leucine-rich repeat and pyrin domain-containing protein 3 inflammasome as well as interleukin-1β in the hippocampus and colon tissues. Moreover, the microbiota diversity and composition of sleep deprivation mice were significantly affected by O3-RI intervention, as evidenced by the reversal of the Firmicutes/Bacteroidetes abundance ratio and the relative abundance of the Bacteroides genus. In particular, the relative abundance of the Bacteroides genus demonstrated a pronounced correlation with cognitive impairment and inflammation. Our findings suggested that O3-RI can improve cognitive dysfunction in sleep deprivation mice, and its mechanisms may be related to regulating gut microbiota and alleviating inflammation and damage in the hippocampus and colon.
Collapse
Affiliation(s)
- Jie Cheng
- Medical School, University of Chinese Academy of Sciences, Beijing, China
| | - John P. Williams
- Department of Anesthesiology and Perioperative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Li Zhou
- Institute for lnnoration Diagnosis & Treatment in Anesthesiology, School of Anesthesiology, Shandong Second Medical University, Weifang, Shandong Province, China
| | - Peng-Cheng Wang
- Institute for lnnoration Diagnosis & Treatment in Anesthesiology, School of Anesthesiology, Shandong Second Medical University, Weifang, Shandong Province, China
| | - Li-Na Sun
- Institute for lnnoration Diagnosis & Treatment in Anesthesiology, School of Anesthesiology, Shandong Second Medical University, Weifang, Shandong Province, China
| | - Rui-Hua Li
- Institute for lnnoration Diagnosis & Treatment in Anesthesiology, School of Anesthesiology, Shandong Second Medical University, Weifang, Shandong Province, China
| | - Jian-Xiong An
- Medical School, University of Chinese Academy of Sciences, Beijing, China
- Institute for lnnoration Diagnosis & Treatment in Anesthesiology, School of Anesthesiology, Shandong Second Medical University, Weifang, Shandong Province, China
- Center of Anesthesiology, Pain and Sleep Medicine, Rapid Anti-depression, The Affiliated Hospital of Shandong Second Medical University, Weifang, Shandong Province, China
- Department of Anesthesiology and Perioperative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| |
Collapse
|
7
|
Cui Y, Liu J, Lei X, Liu S, Chen H, Wei Z, Li H, Yang Y, Zheng C, Li Z. Dual-directional regulation of spinal cord injury and the gut microbiota. Neural Regen Res 2024; 19:548-556. [PMID: 37721283 PMCID: PMC10581592 DOI: 10.4103/1673-5374.380881] [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: 01/11/2023] [Revised: 04/17/2023] [Accepted: 06/05/2023] [Indexed: 09/19/2023] Open
Abstract
There is increasing evidence that the gut microbiota affects the incidence and progression of central nervous system diseases via the brain-gut axis. The spinal cord is a vital important part of the central nervous system; however, the underlying association between spinal cord injury and gut interactions remains unknown. Recent studies suggest that patients with spinal cord injury frequently experience intestinal dysfunction and gut dysbiosis. Alterations in the gut microbiota can cause disruption in the intestinal barrier and trigger neurogenic inflammatory responses which may impede recovery after spinal cord injury. This review summarizes existing clinical and basic research on the relationship between the gut microbiota and spinal cord injury. Our research identified three key points. First, the gut microbiota in patients with spinal cord injury presents a key characteristic and gut dysbiosis may profoundly influence multiple organs and systems in patients with spinal cord injury. Second, following spinal cord injury, weakened intestinal peristalsis, prolonged intestinal transport time, and immune dysfunction of the intestine caused by abnormal autonomic nerve function, as well as frequent antibiotic treatment, may induce gut dysbiosis. Third, the gut microbiota and associated metabolites may act on central neurons and affect recovery after spinal cord injury; cytokines and the Toll-like receptor ligand pathways have been identified as crucial mechanisms in the communication between the gut microbiota and central nervous system. Fecal microbiota transplantation, probiotics, dietary interventions, and other therapies have been shown to serve a neuroprotective role in spinal cord injury by modulating the gut microbiota. Therapies targeting the gut microbiota or associated metabolites are a promising approach to promote functional recovery and improve the complications of spinal cord injury.
Collapse
Affiliation(s)
- Yinjie Cui
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
- School of Medical Technology, Tianjin University of Traditional Chinese Medicine, Tianjin, China
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Jingyi Liu
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Xiao Lei
- International Cooperation and Exchange Office, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan Province, China
| | - Shuwen Liu
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Haixia Chen
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Zhijian Wei
- International Cooperation Base of Spinal Cord Injury, Tianjin Key Laboratory of Spine and Spinal Cord Injury, Department of Orthopedics, Tianjin Medical University General Hospital, Tianjin, China
- Department of Orthopedics, Qilu Hospital of Shandong University, Jinan, Shandong Province, China
| | - Hongru Li
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yuan Yang
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Chenguang Zheng
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| | - Zhongzheng Li
- Research Center of Experimental Acupuncture Science, Tianjin University of Traditional Chinese Medicine, Tianjin, China
| |
Collapse
|
8
|
Lan Z, Tang X, Lu M, Hu Z, Tang Z. The role of short-chain fatty acids in central nervous system diseases: A bibliometric and visualized analysis with future directions. Heliyon 2024; 10:e26377. [PMID: 38434086 PMCID: PMC10906301 DOI: 10.1016/j.heliyon.2024.e26377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 02/11/2024] [Accepted: 02/12/2024] [Indexed: 03/05/2024] Open
Abstract
Background Short-chain fatty acids (SCFAs) are thought to play a key role in the microbe-gut-brain axis and involve in the pathogenesis of a variety of neurological diseases. This study aimed to identify research hotspots and evolution trends in SCFAs in central nervous diseases (CNS) and examine current research trends. Methods The bibliometric analysis was performed using CiteSpace, and the results were visualized via network maps. Results From 2002 to 2022, 480 publications in the database met the criteria. On the country level, China produced the highest number of publications, while the United States had the highest centrality. On the institutional level, University College Cork contributed to the most publications, and John F. Cryan from this university was the key researcher with considerable academic influence. The article, the role of short-chain fatty acids in microbiota-gut-brain, written by Boushra Dalile et al., in 2019 was the most cited article. Furthermore, the journal Nutrients had the maximum number of publications, while Plos One was the most cited journal. "Gut microbiome", "SCFAs", and "central nervous system" were the three most frequent keywords. Among them, SCFAs had the highest centrality. "Animal model" was the keyword with the highest burst strength, with the latest burst keywords being "social behavior", "pathogenesis", and "insulin sensitive". In addition, the research topics on SCFAs in CNS diseases from 2002 to 2022 mainly focused on following aspects: SCFAs plays a key role in microbe-gut-brain crosstalk; The classification and definition of SCFAs in the field of CNS; Several CNS diseases that are closely related to SCFAs research; Mechanism and translational studies of SCFAs in the CNS diseases. And the hotspots over the past 5 years have gradually increased the attention to the therapeutic potential of SCFAs in the CNS diseases. Conclusion The research of SCFAs in CNS diseases is attracting growing attention. However, there is a lack of cooperation between countries and institutions, and additional measures are required to promote cooperation. The current evidence for an association between SCFAs and CNS diseases is preliminary and more work is needed to pinpoint the precise mechanism. Moreover, large-scale clinical trials are needed in the future to define the therapeutic potential of SCFAs in CNS diseases.
Collapse
Affiliation(s)
- Ziwei Lan
- Department of Neurology, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Xiangqi Tang
- Department of Neurology, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Ming Lu
- Hunan Provincial Key Laboratory of Neurorestoratology, The Second Affiliated Hospital, Hunan Normal University, Changsha, 410003, Hunan, China
| | - Zhiping Hu
- Department of Neurology, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| | - Zhenchu Tang
- Department of Neurology, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
- Hunan Key Laboratory of Tumor Models and Individualized Medicine, The Second Xiangya Hospital of Central South University, Changsha, Hunan, 410011, China
| |
Collapse
|
9
|
Kim CS. Roles of Diet-Associated Gut Microbial Metabolites on Brain Health: Cell-to-Cell Interactions between Gut Bacteria and the Central Nervous System. Adv Nutr 2024; 15:100136. [PMID: 38436218 PMCID: PMC10694655 DOI: 10.1016/j.advnut.2023.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 09/21/2023] [Accepted: 10/26/2023] [Indexed: 03/05/2024] Open
Abstract
Gut microbiota have crucial effects on brain function via the gut-brain axis. Growing evidence suggests that this interaction is mediated by signaling molecules derived from dietary components metabolized by the intestinal microbiota. Although recent studies have provided a substantial understanding of the cell-specific effects of gut microbial molecules in gut microbiome-brain research, further validation is needed. This review presents recent findings on gut microbiota-derived dietary metabolites that enter the systemic circulation and influence the cell-to-cell interactions between gut microbes and cells in the central nervous system (CNS), particularly microglia, astrocytes, and neuronal cells, ultimately affecting cognitive function, mood, and behavior. Specifically, this review highlights the roles of metabolites produced by the gut microbiota via dietary component transformation, including short-chain fatty acids, tryptophan metabolites, and bile acid metabolites, in promoting the function and maturation of brain cells and suppressing inflammatory signals in the CNS. We also discuss future directions for gut microbiome-brain research, focusing on diet-induced microbial metabolite-based therapies as possible novel approaches to mental health treatment.
Collapse
Affiliation(s)
- Chong-Su Kim
- Department of Food and Nutrition, College of Natural Information Sciences, Dongduk Women's University, Seoul 02748, Republic of Korea.
| |
Collapse
|
10
|
Jia X, Chen Q, Zhang Y, Asakawa T. Multidirectional associations between the gut microbiota and Parkinson's disease, updated information from the perspectives of humoral pathway, cellular immune pathway and neuronal pathway. Front Cell Infect Microbiol 2023; 13:1296713. [PMID: 38173790 PMCID: PMC10762314 DOI: 10.3389/fcimb.2023.1296713] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 11/27/2023] [Indexed: 01/05/2024] Open
Abstract
The human gastrointestinal tract is inhabited by a diverse range of microorganisms, collectively known as the gut microbiota, which form a vast and complex ecosystem. It has been reported that the microbiota-gut-brain axis plays a crucial role in regulating host neuroprotective function. Studies have shown that patients with Parkinson's disease (PD) have dysbiosis of the gut microbiota, and experiments involving germ-free mice and fecal microbiota transplantation from PD patients have revealed the pathogenic role of the gut microbiota in PD. Interventions targeting the gut microbiota in PD, including the use of prebiotics, probiotics, and fecal microbiota transplantation, have also shown efficacy in treating PD. However, the causal relationship between the gut microbiota and Parkinson's disease remains intricate. This study reviewed the association between the microbiota-gut-brain axis and PD from the perspectives of humoral pathway, cellular immune pathway and neuronal pathway. We found that the interactions among gut microbiota and PD are very complex, which should be "multidirectional", rather than conventionally regarded "bidirectional". To realize application of the gut microbiota-related mechanisms in the clinical setting, we propose several problems which should be addressed in the future study.
Collapse
Affiliation(s)
- Xiaokang Jia
- School of Traditional Chinese Medicine, Hainan Medical University, Haikou, Hainan, China
| | - Qiliang Chen
- School of Basic Medicine, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong, China
| | - Yuanyuan Zhang
- Department of Acupuncture and Moxibustion, The Affiliated Traditional Chinese Medicine (TCM) Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Tetsuya Asakawa
- Institute of Neurology, National Clinical Research Center for Infectious Diseases, the Third People’s Hospital of Shenzhen, Shenzhen, Guangdong, China
| |
Collapse
|
11
|
Xie H, Chen J, Chen Q, Zhao Y, Liu J, Sun J, Hu X. The Diagnostic Value of Gut Microbiota Analysis for Post-Stroke Sleep Disorders. Diagnostics (Basel) 2023; 13:2970. [PMID: 37761337 PMCID: PMC10530055 DOI: 10.3390/diagnostics13182970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Gut microbiota have been associated with many psychiatric disorders. However, the changes in the composition of gut microbiota in patients with post-stroke sleep disorders (PSSDs) remain unclear. Here, we determined the gut microbial signature of PSSD patients. METHODS Fecal samples of 205 patients with ischemic stroke were collected within 24 h of admission and were further analyzed using 16 s RNA gene sequencing followed by bioinformatic analysis. The diversity, community composition, and differential microbes of gut microbiota were assessed. The outcome of sleep disorders was determined by the Pittsburgh Sleep Quality Index (PSQI) at 3 months after admission. The diagnostic performance of microbial characteristics in predicting PSSDs was assessed by receiver operating characteristic (ROC) curves. RESULTS Our results showed that the composition and structure of microbiota in patients with PSSDs were different from those without sleep disorders (PSNSDs). Moreover, the linear discriminant analysis effect size (LEfSe) showed significant differences in gut-associated bacteria, such as species of Streptococcus, Granulicatella, Dielma, Blautia, Paeniclostridium, and Sutterella. We further managed to identify the optimal microbiota signature and revealed that the predictive model with eight operational-taxonomic-unit-based biomarkers achieved a high accuracy in PSSD prediction (AUC = 0.768). Blautia and Streptococcus were considered to be the key microbiome signatures for patients with PSSD. CONCLUSIONS These findings indicated that a specific gut microbial signature was an important predictor of PSSDs, which highlighted the potential of microbiota as a promising biomarker for detecting PSSD patients.
Collapse
Affiliation(s)
- Huijia Xie
- Department of Geriatrics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China; (H.X.); (J.C.); (Q.C.); (Y.Z.)
| | - Jiaxin Chen
- Department of Geriatrics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China; (H.X.); (J.C.); (Q.C.); (Y.Z.)
| | - Qionglei Chen
- Department of Geriatrics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China; (H.X.); (J.C.); (Q.C.); (Y.Z.)
| | - Yiting Zhao
- Department of Geriatrics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China; (H.X.); (J.C.); (Q.C.); (Y.Z.)
| | - Jiaming Liu
- Department of Preventive Medicine, School of Public Health and Management, Wenzhou Medical University, Wenzhou 325035, China;
| | - Jing Sun
- Department of Geriatrics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China; (H.X.); (J.C.); (Q.C.); (Y.Z.)
| | - Xuezhen Hu
- Department of Emergency Medicine, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou 325027, China
| |
Collapse
|
12
|
Buga AM, Padureanu V, Riza AL, Oancea CN, Albu CV, Nica AD. The Gut-Brain Axis as a Therapeutic Target in Multiple Sclerosis. Cells 2023; 12:1872. [PMID: 37508537 PMCID: PMC10378521 DOI: 10.3390/cells12141872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/14/2023] [Accepted: 07/15/2023] [Indexed: 07/30/2023] Open
Abstract
The CNS is very susceptible to oxidative stress; the gut microbiota plays an important role as a trigger of oxidative damage that promotes mitochondrial dysfunction, neuroinflammation, and neurodegeneration. In the current review, we discuss recent findings on oxidative-stress-related inflammation mediated by the gut-brain axis in multiple sclerosis (MS). Growing evidence suggests targeting gut microbiota can be a promising strategy for MS management. Intricate interaction between multiple factors leads to increased intra- and inter-individual heterogeneity, frequently painting a different picture in vivo from that obtained under controlled conditions. Following an evidence-based approach, all proposed interventions should be validated in clinical trials with cohorts large enough to reach significance. Our review summarizes existing clinical trials focused on identifying suitable interventions, the suitable combinations, and appropriate timings to target microbiota-related oxidative stress. Most studies assessed relapsing-remitting MS (RRMS); only a few studies with very limited cohorts were carried out in other MS stages (e.g., secondary progressive MS-SPMS). Future trials must consider an extended time frame, perhaps starting with the perinatal period and lasting until the young adult period, aiming to capture as many complex intersystem interactions as possible.
Collapse
Affiliation(s)
- Ana Maria Buga
- Department of Biochemistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.M.B.); (C.N.O.)
| | - Vlad Padureanu
- Department of Internal Medicine, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania;
| | - Anca-Lelia Riza
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania;
- Regional Center for Medical Genetics Dolj, Emergency County Hospital Craiova, 200638 Craiova, Romania
| | - Carmen Nicoleta Oancea
- Department of Biochemistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.M.B.); (C.N.O.)
| | - Carmen Valeria Albu
- Department of Neurology, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Alexandru Dan Nica
- Department of Biochemistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.M.B.); (C.N.O.)
| |
Collapse
|
13
|
Dunalska A, Saramak K, Szejko N. The Role of Gut Microbiome in the Pathogenesis of Multiple Sclerosis and Related Disorders. Cells 2023; 12:1760. [PMID: 37443793 PMCID: PMC10341087 DOI: 10.3390/cells12131760] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/15/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Multiple sclerosis (MS) is a chronic, progressive neuroinflammatory disease with a complex pathophysiological background. A variety of diverse factors have been attributed to the propagation of inflammation and neurodegeneration in MS, mainly genetic, immunological, and environmental factors such as vitamin D deficiency, infections, or hormonal disbalance. Recently, the importance of the gut-brain axis for the development of many neurological conditions, including stroke, movement disorders, and neuroinflammatory disorders, has been postulated. The purpose of our paper was to summarize current evidence confirming the role of the gut microbiome in the pathophysiology of MS and related disorders, such as neuromyelitis optica spectrum disorder (NMO-SD). For this aim, we conducted a systematic review of the literature listed in the following databases: Medline, Pubmed, and Scopus, and were able to identify several studies demonstrating the involvement of the gut microbiome in the pathophysiology of MS and NMO-SD. It seems that the most relevant bacteria for the pathophysiology of MS are those belonging to Pseudomonas, Mycoplasma, Haemophilus, Blautia, Dorea, Faecalibacterium, Methanobrevibacter, Akkermansia, and Desulfovibrionaceae genera, while Clostridium perfringens and Streptoccocus have been demonstrated to play a role in the pathophysiology of NMO-SD. Following this line of evidence, there is also some preliminary data supporting the use of probiotics or other agents affecting the microbiome that could potentially have a beneficial effect on MS/NMO-SD symptoms and prognosis. The topic of the gut microbiome in the pathophysiology of MS is therefore relevant since it could be used as a biomarker of disease development and progression as well as a potential disease-modifying therapy.
Collapse
Affiliation(s)
- Anna Dunalska
- Department of Neurology, Medical University of Warsaw, 02-097 Warsaw, Poland;
| | - Kamila Saramak
- Department of Neurology, Hochzirl Hospital, 6170 Hochzirl, Austria;
| | - Natalia Szejko
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB T2N 1N4, Canada
- Department of Bioethics, Medical University of Warsaw, 02-091 Warsaw, Poland
| |
Collapse
|
14
|
Han S, Cai L, Chen P, Kuang W. A study of the correlation between stroke and gut microbiota over the last 20years: a bibliometric analysis. Front Microbiol 2023; 14:1191758. [PMID: 37350780 PMCID: PMC10282156 DOI: 10.3389/fmicb.2023.1191758] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/19/2023] [Indexed: 06/24/2023] Open
Abstract
Purpose This study intends to uncover a more thorough knowledge structure, research hotspots, and future trends in the field by presenting an overview of the relationship between stroke and gut microbiota in the past two decades. Method Studies on stroke and gut microbiota correlations published between 1st January 2002 and 31st December 2021 were retrieved from the Web of Science Core Collection and then visualized and scientometrically analyzed using CiteSpace V. Results A total of 660 papers were included in the study, among which the United States, the United Kingdom, and Germany were the leading research centers. Cleveland Clinic, Southern Medical University, and Chinese Academy of Science were the top three institutions. The NATURE was the most frequently co-cited journal. STANLEY L HAZEN was the most published author, and Tang WHW was the most cited one. The co-occurrence analysis revealed eight clusters (i.e., brain-gut microbiota axis, fecal microbiome transplantation, gut microbiota, hypertension, TMAO, ischemic stroke, neuroinflammation, atopobiosis). "gut microbiota," "Escherichia coli," "cardiovascular disease," "risk," "disease," "ischemic stroke," "stroke," "metabolism," "inflammation," and "phosphatidylcholine" were the most recent keyword explosions. Conclusion Findings suggest that in the next 10 years, the number of publications produced annually may increase significantly. Future research trends tend to concentrate on the mechanisms of stroke and gut microbiota, with the inflammation and immunological mechanisms, TMAO, and fecal transplantation as hotspots. And the relationship between these mechanisms and a particular cardiovascular illness may also be a future research trend.
Collapse
Affiliation(s)
- Shengnan Han
- Clinical Medical College of Acupuncture, Moxibustion and Rehabilitation, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Longhui Cai
- First School of Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Peipei Chen
- School of Medical Technology, Qiqihar Medical College, Qiqihar, Heilongjiang, China
| | - Weihong Kuang
- Guangdong Key Laboratory for Research and Development of Natural Drugs, School of Pharmacy, Guangdong Medical University, Dongguan, China
| |
Collapse
|
15
|
Wang YR, Cui WQ, Wu HY, Xu XD, Xu XQ. The role of T cells in acute ischemic stroke. Brain Res Bull 2023; 196:20-33. [PMID: 36906042 DOI: 10.1016/j.brainresbull.2023.03.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 03/02/2023] [Accepted: 03/06/2023] [Indexed: 03/11/2023]
Abstract
Acute ischemic stroke (AIS) is associated with high rates of disability and mortality, exerting a substantial impact on overall survival and health-related quality of life. Treatment of AIS remains challenging given that the underlying pathologic mechanisms remain unclear. However, recent research has demonstrated that the immune system plays a key role in the development of AIS. Numerous studies have reported infiltration of T cells into ischemic brain tissue. While some types of T cells can promote the development of inflammatory responses and aggravate ischemic damage in patients with AIS, other T cells appear to exert neuroprotective effects via immunosuppression and other mechanisms. In this review, we discuss the recent findings regarding the infiltration of T cells into ischemic brain tissue, and the mechanisms governing how T cells can facilitate tissue injury or neuroprotection in AIS. Factors influencing the function of T cells, such as intestinal microflora and sex differences, are also discussed. We also explore the recent research on the effect of non-coding RNA on T cells after stroke, as well as the potential for specifically targeting T cells in the treatment of stroke patients.
Collapse
Affiliation(s)
- Yi-Ran Wang
- College of Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Wen-Qiang Cui
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China; First College of Clinical Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Hong-Yun Wu
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China; First College of Clinical Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiang-Dong Xu
- Experimental Center, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiang-Qing Xu
- Department of Neurology, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China; First College of Clinical Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China.
| |
Collapse
|
16
|
Immunity orchestrates a bridge in gut-brain axis of neurodegenerative diseases. Ageing Res Rev 2023; 85:101857. [PMID: 36669690 DOI: 10.1016/j.arr.2023.101857] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 01/15/2023] [Accepted: 01/15/2023] [Indexed: 01/18/2023]
Abstract
Neurodegenerative diseases, in particular for Alzheimer's disease (AD), Parkinson's disease (PD) and Multiple sclerosis (MS), are a category of diseases with progressive loss of neuronal structure or function (encompassing neuronal death) leading to neuronal dysfunction, whereas the underlying pathogenesis remains to be clarified. As the microbiological ecosystem of the intestinal microbiome serves as the second genome of the human body, it is strongly implicated as an essential element in the initiation and/or progression of neurodegenerative diseases. Nevertheless, the precise underlying principles of how the intestinal microflora impact on neurodegenerative diseases via gut-brain axis by modulating the immune function are still poorly characterized. Consequently, an overview of initiating the development of neurodegenerative diseases and the contribution of intestinal microflora on immune function is discussed in this review.
Collapse
|
17
|
The Lung Microbiome: A New Frontier for Lung and Brain Disease. Int J Mol Sci 2023; 24:ijms24032170. [PMID: 36768494 PMCID: PMC9916971 DOI: 10.3390/ijms24032170] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
Due to the limitations of culture techniques, the lung in a healthy state is traditionally considered to be a sterile organ. With the development of non-culture-dependent techniques, the presence of low-biomass microbiomes in the lungs has been identified. The species of the lung microbiome are similar to those of the oral microbiome, suggesting that the microbiome is derived passively within the lungs from the oral cavity via micro-aspiration. Elimination, immigration, and relative growth within its communities all contribute to the composition of the lung microbiome. The lung microbiome is reportedly altered in many lung diseases that have not traditionally been considered infectious or microbial, and potential pathways of microbe-host crosstalk are emerging. Recent studies have shown that the lung microbiome also plays an important role in brain autoimmunity. There is a close relationship between the lungs and the brain, which can be called the lung-brain axis. However, the problem now is that it is not well understood how the lung microbiota plays a role in the disease-specifically, whether there is a causal connection between disease and the lung microbiome. The lung microbiome includes bacteria, archaea, fungi, protozoa, and viruses. However, fungi and viruses have not been fully studied compared to bacteria in the lungs. In this review, we mainly discuss the role of the lung microbiome in chronic lung diseases and, in particular, we summarize the recent progress of the lung microbiome in multiple sclerosis, as well as the lung-brain axis.
Collapse
|
18
|
Exercise Preconditioning Ameliorates Cognitive Impairment in Mice with Ischemic Stroke by Alleviating Inflammation and Modulating Gut Microbiota. Mediators Inflamm 2022; 2022:2124230. [PMID: 36262547 PMCID: PMC9576414 DOI: 10.1155/2022/2124230] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/27/2022] [Indexed: 12/04/2022] Open
Abstract
Several studies have demonstrated that exercise preconditioning is an effective means of alleviating poststroke cognitive impairment (PSCI). Mechanisms of regulating cognitive function have not been fully elucidated. Herein, the present study is aimed at exploring the effect of the microbiota-gut-inflammasome-brain axis in the process of exercise preconditioning moderating cognitive impairment after ischemic stroke. We observed that exercise preconditioning decreased infarct size, reduced the degree of neuronal damage, and alleviated cognitive impairment in mice with ischemic stroke. In addition, exercise preconditioning also reduced the expression of inflammatory cytokines, as well as NLRP3, Caspase-1, IL-18, and IL-1β protein expressions. Ischemic stroke could downregulate the abundance of Roseburia while increasing the abundance of the Helicobacter at the level of genus. As a comparison, exercise preconditioning increased the abundance of the Lactobacillus, which was beneficial for mice at the genus level. In conclusion, exercise preconditioning can improve cognitive dysfunction after ischemic stroke through alleviating inflammation and regulating the composition and diversity of the gut microbiota, which might provide a new strategy for the prevention of PSCI.
Collapse
|
19
|
Liu R, Du S, Zhao L, Jain S, Sahay K, Rizvanov A, Lezhnyova V, Khaibullin T, Martynova E, Khaiboullina S, Baranwal M. Autoreactive lymphocytes in multiple sclerosis: Pathogenesis and treatment target. Front Immunol 2022; 13:996469. [PMID: 36211343 PMCID: PMC9539795 DOI: 10.3389/fimmu.2022.996469] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 09/08/2022] [Indexed: 11/13/2022] Open
Abstract
Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS) characterized by destruction of the myelin sheath structure. The loss of myelin leads to damage of a neuron’s axon and cell body, which is identified as brain lesions on magnetic resonance image (MRI). The pathogenesis of MS remains largely unknown. However, immune mechanisms, especially those linked to the aberrant lymphocyte activity, are mainly responsible for neuronal damage. Th1 and Th17 populations of lymphocytes were primarily associated with MS pathogenesis. These lymphocytes are essential for differentiation of encephalitogenic CD8+ T cell and Th17 lymphocyte crossing the blood brain barrier and targeting myelin sheath in the CNS. B-lymphocytes could also contribute to MS pathogenesis by producing anti-myelin basic protein antibodies. In later studies, aberrant function of Treg and Th9 cells was identified as contributing to MS. This review summarizes the aberrant function and count of lymphocyte, and the contributions of these cell to the mechanisms of MS. Additionally, we have outlined the novel MS therapeutics aimed to amend the aberrant function or counts of these lymphocytes.
Collapse
Affiliation(s)
- Rongzeng Liu
- Department of Immunology, School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Shushu Du
- Department of Immunology, School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Lili Zhao
- Department of Immunology, School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Sahil Jain
- Department of Biochemistry and Molecular Biology, Faculty of Life Sciences, Tel-Aviv University, Tel-Aviv, Israel
| | - Kritika Sahay
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Albert Rizvanov
- Gene and cell Department, Kazan Federal University, Kazan, Russia
| | - Vera Lezhnyova
- Gene and cell Department, Kazan Federal University, Kazan, Russia
| | - Timur Khaibullin
- Neurological Department, Republican Clinical Neurological Center, Kazan, Russia
| | | | - Svetlana Khaiboullina
- Gene and cell Department, Kazan Federal University, Kazan, Russia
- *Correspondence: Svetlana Khaiboullina, ; Manoj Baranwal, ;
| | - Manoj Baranwal
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
- *Correspondence: Svetlana Khaiboullina, ; Manoj Baranwal, ;
| |
Collapse
|
20
|
Bierhansl L, Hartung HP, Aktas O, Ruck T, Roden M, Meuth SG. Thinking outside the box: non-canonical targets in multiple sclerosis. Nat Rev Drug Discov 2022; 21:578-600. [PMID: 35668103 PMCID: PMC9169033 DOI: 10.1038/s41573-022-00477-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/22/2022] [Indexed: 12/11/2022]
Abstract
Multiple sclerosis (MS) is an immune-mediated disease of the central nervous system that causes demyelination, axonal degeneration and astrogliosis, resulting in progressive neurological disability. Fuelled by an evolving understanding of MS immunopathogenesis, the range of available immunotherapies for clinical use has expanded over the past two decades. However, MS remains an incurable disease and even targeted immunotherapies often fail to control insidious disease progression, indicating the need for new and exceptional therapeutic options beyond the established immunological landscape. In this Review, we highlight such non-canonical targets in preclinical MS research with a focus on five highly promising areas: oligodendrocytes; the blood-brain barrier; metabolites and cellular metabolism; the coagulation system; and tolerance induction. Recent findings in these areas may guide the field towards novel targets for future therapeutic approaches in MS.
Collapse
Affiliation(s)
- Laura Bierhansl
- Department of Neurology, Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Brain and Mind Centre, University of Sydney, Sydney, NSW, Australia
- Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Orhan Aktas
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Tobias Ruck
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Michael Roden
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Department of Endocrinology and Diabetology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
- German Center of Diabetes Research, Partner Düsseldorf, Neuherberg, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
| |
Collapse
|
21
|
Duarte-Silva E, Ulrich H, Oliveira-Giacomelli Á, Hartung HP, Meuth SG, Peixoto CA. The adenosinergic signaling in the pathogenesis and treatment of multiple sclerosis. Front Immunol 2022; 13:946698. [PMID: 35967385 PMCID: PMC9368763 DOI: 10.3389/fimmu.2022.946698] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 06/27/2022] [Indexed: 11/15/2022] Open
Abstract
Multiple sclerosis (MS) is a highly disabling, progressive neurodegenerative disease with no curative treatment available. Although significant progress has been made in understanding how MS develops, there remain aspects of disease pathogenesis that are yet to be fully elucidated. In this regard, studies have shown that dysfunctional adenosinergic signaling plays a pivotal role, as patients with MS have altered levels adenosine (ADO), adenosine receptors and proteins involved in the generation and termination of ADO signaling, such as CD39 and adenosine deaminase (ADA). We have therefore performed a literature review regarding the involvement of the adenosinergic system in the development of MS and propose mechanisms by which the modulation of this system can support drug development and repurposing.
Collapse
Affiliation(s)
- Eduardo Duarte-Silva
- Laboratory of Ultrastructure, Aggeu Magalhães Institute (IAM), Recife, Brazil
- Postgraduate Program in Biosciences and Biotechnology for Health (PPGBBS), Oswaldo Cruz Foundation (FIOCRUZ-PE)/Aggeu Magalhães Institute (IAM), Recife, Brazil
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Recife, Brazil
- Department of Neurology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Henning Ulrich
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | | | - Hans-Peter Hartung
- Department of Neurology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
- Brain and Mind Center, University of Sydney, Sydney, NSW, Australia
- Department of Neurology, Palacky University Olomouc, Olomouc, Czechia
- Department of Neurology, Medical University of Vienna, Vienna, Austria
| | - Sven G. Meuth
- Department of Neurology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Christina Alves Peixoto
- Laboratory of Ultrastructure, Aggeu Magalhães Institute (IAM), Recife, Brazil
- National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| |
Collapse
|
22
|
Wang X, Liang Z, Wang S, Ma D, Zhu M, Feng J. Role of Gut Microbiota in Multiple Sclerosis and Potential Therapeutic Implications. Curr Neuropharmacol 2022; 20:1413-1426. [PMID: 34191698 PMCID: PMC9881072 DOI: 10.2174/1570159x19666210629145351] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 06/03/2021] [Accepted: 06/25/2021] [Indexed: 11/22/2022] Open
Abstract
The role of gut microbiota in health and diseases has been receiving increased attention recently. Emerging evidence from previous studies on gut-microbiota-brain axis highlighted the importance of gut microbiota in neurological disorders. Multiple sclerosis (MS) is a chronic, inflammatory, demyelinating disease of the central nervous system (CNS) resulting from T-cell-driven, myelin-directed autoimmunity. The dysbiosis of gut microbiota in MS patients has been reported in published research studies, indicating that gut microbiota plays an important role in the pathogenesis of MS. Gut microbiota have also been reported to influence the initiation of disease and severity of experimental autoimmune encephalomyelitis, which is the animal model of MS. However, the underlying mechanisms of gut microbiota involvement in the pathogenesis of MS remain unclear. Therefore, in this review, we summerized the potential mechanisms for gut microbiota involvement in the pathogenesis of MS, including increasing the permeability of the intestinal barrier, initiating an autoimmune response, disrupting the blood-brain barrier integrity, and contributing to chronic inflammation. The possibility for gut microbiota as a target for MS therapy has also been discussed. This review provides new insight into understanding the role of gut microbiota in neurological and inflammatory diseases.
Collapse
Affiliation(s)
- Xu Wang
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China
| | - Zhen Liang
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China
| | - Shengnan Wang
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China
| | - Di Ma
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China
| | - Mingqin Zhu
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China,Address correspondence to these authors at the Department of Neurology, the First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021; Tel: + 86 13756661276; E-mail: ; Tel: +86 15948316086; E-mail:
| | - Jiachun Feng
- Department of Neurology, The First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021, China,Address correspondence to these authors at the Department of Neurology, the First Hospital of Jilin University, Xinmin Street 71# Changchun, CN 130021; Tel: + 86 13756661276; E-mail: ; Tel: +86 15948316086; E-mail:
| |
Collapse
|
23
|
Duarte-Silva E, Meuth SG, Peixoto CA. Microbial Metabolites in Multiple Sclerosis: Implications for Pathogenesis and Treatment. Front Neurosci 2022; 16:885031. [PMID: 35573295 PMCID: PMC9096831 DOI: 10.3389/fnins.2022.885031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 04/05/2022] [Indexed: 12/18/2022] Open
Abstract
Metabolites produced by the gut microbiota have been shown to play an important role in numerous inflammatory, neuropsychiatric, and neurodegenerative diseases. Specifically, microbial metabolites have been implicated in the modulation of innate and adaptive immunity, especially in the generation of regulatory T cells (Tregs), which are key regulators of multiple sclerosis (MS) pathogenesis. Furthermore, they affect processes relevant to MS pathophysiology, such as inflammation and demyelination, which makes them attractive molecules to be explored as therapeutics in MS. In this review, we discuss the importance of these metabolites as factors contributing to disease pathogenesis and as therapeutic targets in MS. Establishing an improved understanding of these gut-microbiota derived metabolites may provide new avenues for the treatment of MS.
Collapse
Affiliation(s)
- Eduardo Duarte-Silva
- Laboratory of Ultrastructure, Aggeu Magalhães Institute (IAM), Recife, Brazil.,Postgraduate Program in Biosciences and Biotechnology for Health (PPGBBS), Oswaldo Cruz Foundation (FIOCRUZ-PE)/Aggeu Magalhães Institute (IAM), Recife, Brazil.,Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Recife, Brazil.,Department of Neurology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Christina Alves Peixoto
- Laboratory of Ultrastructure, Aggeu Magalhães Institute (IAM), Recife, Brazil.,National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM), Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| |
Collapse
|
24
|
Ermakov EA, Melamud MM, Buneva VN, Ivanova SA. Immune System Abnormalities in Schizophrenia: An Integrative View and Translational Perspectives. Front Psychiatry 2022; 13:880568. [PMID: 35546942 PMCID: PMC9082498 DOI: 10.3389/fpsyt.2022.880568] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/30/2022] [Indexed: 12/12/2022] Open
Abstract
The immune system is generally known to be the primary defense mechanism against pathogens. Any pathological conditions are reflected in anomalies in the immune system parameters. Increasing evidence suggests the involvement of immune dysregulation and neuroinflammation in the pathogenesis of schizophrenia. In this systematic review, we summarized the available evidence of abnormalities in the immune system in schizophrenia. We analyzed impairments in all immune system components and assessed the level of bias in the available evidence. It has been shown that schizophrenia is associated with abnormalities in all immune system components: from innate to adaptive immunity and from humoral to cellular immunity. Abnormalities in the immune organs have also been observed in schizophrenia. Evidence of increased C-reactive protein, dysregulation of cytokines and chemokines, elevated levels of neutrophils and autoantibodies, and microbiota dysregulation in schizophrenia have the lowest risk of bias. Peripheral immune abnormalities contribute to neuroinflammation, which is associated with cognitive and neuroanatomical alterations and contributes to the pathogenesis of schizophrenia. However, signs of severe inflammation are observed in only about 1/3 of patients with schizophrenia. Immunological parameters may help identify subgroups of individuals with signs of inflammation who well respond to anti-inflammatory therapy. Our integrative approach also identified gaps in knowledge about immune abnormalities in schizophrenia, and new horizons for the research are proposed.
Collapse
Affiliation(s)
- Evgeny A. Ermakov
- Laboratory of Repair Enzymes, Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | - Mark M. Melamud
- Laboratory of Repair Enzymes, Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
| | - Valentina N. Buneva
- Laboratory of Repair Enzymes, Institute of Chemical Biology and Fundamental Medicine, Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | - Svetlana A. Ivanova
- Laboratory of Molecular Genetics and Biochemistry, Mental Health Research Institute, Tomsk National Research Medical Center of the Russian Academy of Sciences, Tomsk, Russia
| |
Collapse
|
25
|
Multiple Sclerosis and Microbiome. Biomolecules 2022; 12:biom12030433. [PMID: 35327624 PMCID: PMC8946130 DOI: 10.3390/biom12030433] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/03/2022] [Accepted: 03/08/2022] [Indexed: 01/02/2023] Open
Abstract
The composition of microbiota and the gut-brain axis is increasingly considered a factor in the development of various pathological conditions. The etiology of multiple sclerosis (MS), a chronic autoimmune disease affecting the CNS, is complex and interactions within the gut-brain axis may be relevant in the development and the course of MS. In this article, we focus on the relationship between gut microbiota and the pathophysiology of MS. We review the contribution of germ-free mouse studies to our understanding of MS pathology and its implications for treatment strategies to modulate the microbiome in MS. This summary highlights the need for a better understanding of the role of the microbiota in patients’ responses to disease-modifying drugs in MS and disease activity overall.
Collapse
|
26
|
Dong S, Sun M, He C, Cheng H. Brain-gut-microbiota axis in Parkinson's disease: a historical review and future perspective. Brain Res Bull 2022; 183:84-93. [PMID: 35245613 DOI: 10.1016/j.brainresbull.2022.02.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/15/2022] [Accepted: 02/22/2022] [Indexed: 01/03/2023]
Affiliation(s)
- Siyu Dong
- Department of Neurology, First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Mei Sun
- Department of Neurology, First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Chuan He
- Department of Rehabilitation Medicine, the Affiliated Jiangsu Shengze Hospital of Nanjing Medical University, Suzhou, 215228, China.
| | - Hong Cheng
- Department of Neurology, First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China.
| |
Collapse
|
27
|
Padhi P, Worth C, Zenitsky G, Jin H, Sambamurti K, Anantharam V, Kanthasamy A, Kanthasamy AG. Mechanistic Insights Into Gut Microbiome Dysbiosis-Mediated Neuroimmune Dysregulation and Protein Misfolding and Clearance in the Pathogenesis of Chronic Neurodegenerative Disorders. Front Neurosci 2022; 16:836605. [PMID: 35281490 PMCID: PMC8914070 DOI: 10.3389/fnins.2022.836605] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 02/04/2022] [Indexed: 12/14/2022] Open
Abstract
The human gut microbiota is a complex, dynamic, and highly diverse community of microorganisms. Beginning as early as in utero fetal development and continuing through birth to late-stage adulthood, the crosstalk between the gut microbiome and brain is essential for modulating various metabolic, neurodevelopmental, and immune-related pathways. Conversely, microbial dysbiosis - defined as alterations in richness and relative abundances - of the gut is implicated in the pathogenesis of several chronic neurological and neurodegenerative disorders. Evidence from large-population cohort studies suggests that individuals with neurodegenerative conditions have an altered gut microbial composition as well as microbial and serum metabolomic profiles distinct from those in the healthy population. Dysbiosis is also linked to psychiatric and gastrointestinal complications - comorbidities often associated with the prodromal phase of Parkinson's disease (PD) and Alzheimer's disease (AD). Studies have identified potential mediators that link gut dysbiosis and neurological disorders. Recent findings have also elucidated the potential mechanisms of disease pathology in the enteric nervous system prior to the onset of neurodegeneration. This review highlights the functional pathways and mechanisms, particularly gut microbe-induced chronic inflammation, protein misfolding, propagation of disease-specific pathology, defective protein clearance, and autoimmune dysregulation, linking gut microbial dysbiosis and neurodegeneration. In addition, we also discuss how pathogenic transformation of microbial composition leads to increased endotoxin production and fewer beneficial metabolites, both of which could trigger immune cell activation and enteric neuronal dysfunction. These can further disrupt intestinal barrier permeability, aggravate the systemic pro-inflammatory state, impair blood-brain barrier permeability and recruit immune mediators leading to neuroinflammation and neurodegeneration. Continued biomedical advances in understanding the microbiota-gut-brain axis will extend the frontier of neurodegenerative disorders and enable the utilization of novel diagnostic and therapeutic strategies to mitigate the pathological burden of these diseases.
Collapse
Affiliation(s)
- Piyush Padhi
- Parkinson’s Disorder Research Laboratory, Department of Biomedical Sciences, Iowa State University, Ames, IA, United States
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| | - Carter Worth
- Parkinson’s Disorder Research Laboratory, Department of Biomedical Sciences, Iowa State University, Ames, IA, United States
| | - Gary Zenitsky
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| | - Huajun Jin
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| | - Kumar Sambamurti
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States
| | - Vellareddy Anantharam
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| | - Arthi Kanthasamy
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| | - Anumantha G. Kanthasamy
- Parkinson’s Disorder Research Laboratory, Department of Biomedical Sciences, Iowa State University, Ames, IA, United States
- Department of Physiology and Pharmacology, Center for Brain Sciences and Neurodegenerative Diseases, University of Georgia, Athens, GA, United States
| |
Collapse
|
28
|
Wang X, Wan J, Wang M, Zhang Y, Wu K, Yang F. Multiple sclerosis and inflammatory bowel disease: A systematic review and meta-analysis. Ann Clin Transl Neurol 2022; 9:132-140. [PMID: 35092169 PMCID: PMC8862424 DOI: 10.1002/acn3.51495] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/23/2021] [Accepted: 12/15/2021] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Multiple sclerosis (MS) and inflammatory bowel disease (IBD) are two autoimmune diseases that seriously affect patients' quality of life. Previous studies have established an association between MS and IBD, including Crohn's disease (CD) and ulcerative colitis (UC), but the results were inconsistent. The aim of this study was to quantify the prevalences of and the association between MS and IBD. METHODS The PubMed, Web of Science, and Embase databases were searched through November 2020 for studies reporting data on MS among patients with IBD and vice versa. The main outcomes were the proportion of MS in patients with IBD and vice versa, as well as the association (risk ratio [RR]) of IBD in MS and that of MS in IBD. RESULTS Based on the analysis of 17 studies, the prevalence of MS in patients with IBD was 0.2% (95% CI 0.1-0.4%), while the prevalence of IBD in patients with MS was 0.6% (95% CI 0.4-0.9%). Patients with MS had a higher prevalence of IBD than controls (RR = 1.53, 95% CI 1.38-1.70, p < 0.00001). There was a similarly high risk of developing CD (RR 1.41, 95% CI 1.14-1.74, p = 0.001) or UC (RR 1.42, 95% CI 1.17-1.71, p = 0.0003) in patients with MS (p for subgroup differences: 0.97). Patients with IBD had a higher prevalence of MS than controls (RR = 1.91, 95% CI 1.06-3.45, p = 0.03). CONCLUSIONS Clinicians should be aware of the increased risk of IBD or MS comorbidity during the diagnostic process. Systematic diagnosis and management at an earlier stage are suggested.
Collapse
Affiliation(s)
- Xuan Wang
- Department of Neurology, Xijing HospitalFourth Military Medical UniversityXi'anChina
| | - Jian Wan
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive DiseasesFourth Military Medical UniversityXi'anChina
| | - Min Wang
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive DiseasesFourth Military Medical UniversityXi'anChina
| | - Yujie Zhang
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive DiseasesFourth Military Medical UniversityXi'anChina
- Department of Histology and Embryology, School of Basic MedicineXi'an Medical UniversityXi'anChina
| | - Kaichun Wu
- State Key Laboratory of Cancer Biology, National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive DiseasesFourth Military Medical UniversityXi'anChina
| | - Fang Yang
- Department of Neurology, Xijing HospitalFourth Military Medical UniversityXi'anChina
| |
Collapse
|
29
|
Anavkar A, Patel N, Ali A, Rajan W, Alim H. Gut Microbes: Influencers of Human Brain. MICROBIOME-GUT-BRAIN AXIS 2022:3-27. [DOI: 10.1007/978-981-16-1626-6_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2025]
|
30
|
Carloni S, Rescigno M. Unveiling the gut-brain axis: structural and functional analogies between the gut and the choroid plexus vascular and immune barriers. Semin Immunopathol 2022; 44:869-882. [PMID: 35861857 PMCID: PMC9301898 DOI: 10.1007/s00281-022-00955-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 06/14/2022] [Indexed: 02/07/2023]
Abstract
The vasculature plays an essential role in the development and maintenance of blood-tissue interface homeostasis. Knowledge on the morphological and functional nature of the blood vessels in every single tissue is, however, very poor, but it is becoming clear that each organ is characterized by the presence of endothelial barriers with different properties fundamental for the maintenance of tissue resident immune homeostasis and for the recruitment of blood-trafficking immune cells. The tissue specificity of the vascular unit is dependent on the presence of differentiated endothelial cells that form continues, fenestrated, or sinusoidal vessels with different grades of permeability and different immune receptors, according to how that particular tissue needs to be protected. The gut-brain axis highlights the prominent role that the vasculature plays in allowing a direct and prompt exchange of molecules between the gut, across the gut vascular barrier (GVB), and the brain. Recently, we identified a new choroid plexus vascular barrier (PVB) which receives and integrates information coming from the gut and is fundamental in the modulation of the gut-brain axis. Several pathologies are linked to functional dysregulation of either the gut or the choroid plexus vascular barriers. In this review, we unveil the structural and functional analogies between the GVB and PVB, comparing their peculiar features and highlighting the functional role of pitcher and catcher of the gut-brain axis, including their role in the establishment of immune homeostasis and response upon systemic stimuli. We propose that when the gut vascular barrier-the main protecting system of the body from the external world-is compromised, the choroid plexus gatekeeper becomes a second barrier that protects the central nervous system from systemic inflammation.
Collapse
Affiliation(s)
- Sara Carloni
- Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini, 20072, Pieve Emanuele, MI, Italy.
- IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, MI, Italy.
| | - Maria Rescigno
- Department of Biomedical Sciences, Humanitas University, Via Rita Levi Montalcini, 20072, Pieve Emanuele, MI, Italy.
- IRCCS Humanitas Research Hospital, Via Manzoni 56, 20089, Rozzano, MI, Italy.
| |
Collapse
|
31
|
Parodi B, Kerlero de Rosbo N. The Gut-Brain Axis in Multiple Sclerosis. Is Its Dysfunction a Pathological Trigger or a Consequence of the Disease? Front Immunol 2021; 12:718220. [PMID: 34621267 PMCID: PMC8490747 DOI: 10.3389/fimmu.2021.718220] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 09/07/2021] [Indexed: 12/12/2022] Open
Abstract
A large and expending body of evidence indicates that the gut-brain axis likely plays a crucial role in neurological diseases, including multiple sclerosis (MS). As a whole, the gut-brain axis can be considered as a bi-directional multi-crosstalk pathway that governs the interaction between the gut microbiota and the organism. Perturbation in the commensal microbial population, referred to as dysbiosis, is frequently associated with an increased intestinal permeability, or "leaky gut", which allows the entrance of exogeneous molecules, in particular bacterial products and metabolites, that can disrupt tissue homeostasis and induce inflammation, promoting both local and systemic immune responses. An altered gut microbiota could therefore have significant repercussions not only on immune responses in the gut but also in distal effector immune sites such as the CNS. Indeed, the dysregulation of this bi-directional communication as a consequence of dysbiosis has been implicated as playing a possible role in the pathogenesis of neurological diseases. In multiple sclerosis (MS), the gut-brain axis is increasingly being considered as playing a crucial role in its pathogenesis, with a major focus on specific gut microbiota alterations associated with the disease. In both MS and its purported murine model, experimental autoimmune encephalomyelitis (EAE), gastrointestinal symptoms and/or an altered gut microbiota have been reported together with increased intestinal permeability. In both EAE and MS, specific components of the microbiota have been shown to modulate both effector and regulatory T-cell responses and therefore disease progression, and EAE experiments with germ-free and specific pathogen-free mice transferred with microbiota associated or not with disease have clearly demonstrated the possible role of the microbiota in disease pathogenesis and/or progression. Here, we review the evidence that can point to two possible consequences of the gut-brain axis dysfunction in MS and EAE: 1. A pro-inflammatory intestinal environment and "leaky" gut induced by dysbiosis could lead to an altered communication with the CNS through the cholinergic afferent fibers, thereby contributing to CNS inflammation and disease pathogenesis; and 2. Neuroinflammation affecting efferent cholinergic transmission could result in intestinal inflammation as disease progresses.
Collapse
Affiliation(s)
- Benedetta Parodi
- Department of Neurosciences, Rehabilitation, Ophthalmology and Maternal-Fetal Medicine (DINOGMI), University of Genoa, Genoa, Italy
| | - Nicole Kerlero de Rosbo
- Department of Neurosciences, Rehabilitation, Ophthalmology and Maternal-Fetal Medicine (DINOGMI), University of Genoa, Genoa, Italy.,TomaLab, Institute of Nanotechnology, Consiglio Nazionale delle Ricerche (CNR), Rome, Italy
| |
Collapse
|
32
|
Chen Y, Pu W, Maswikiti E, Tao P, Li X, Wang D, Gu B, Yu Y, Gao L, Zhao C, Chen H. Intestinal congestion and reperfusion injury: damage caused to the intestinal tract and distal organs. Biosci Rep 2021; 41:BSR20211560. [PMID: 34369557 PMCID: PMC8421592 DOI: 10.1042/bsr20211560] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/01/2021] [Accepted: 08/05/2021] [Indexed: 11/17/2022] Open
Abstract
In clinical practice, intestinal autologous diseases, ailments and organ transplants can cause severe congestive damage to the intestinal tract. However, after the etiological factor is gotten rid of and blood flow is free without any hinderance, further damage to the intestinal wall often occurs, causing other related organ dysfunctions. This ultimately results in intestinal congestion reperfusion injury (ICRI). When the structure and function of the intestine are destroyed, bacteria, metabolites and endotoxins in the intestinal tract perfuse and enter the portal vein through the already compromised intestinal mucosa, to the other organs via the liver. Nevertheless, this gives rise to further aggravation of the injury, and reperfusion injury syndrome occurs. ICRI is a very common complication encountered by clinicians, and its harm is more severe and serious as compared with that caused by ischemia-reperfusion. Quite a few number of studies on ICRI have been reported to date. The exact mechanism of the injury is still idiopathic, and effective treatment strategies are still limited. Based on recent studies, this article is aimed at reviewing the destruction, damage mechanisms resulting from ICRI to the intestinal anatomical sites and distant organs. It is geared towards providing new ideas for the prevention and therapeutic approaches of ICRI.
Collapse
Affiliation(s)
- Yajing Chen
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- Department of Pediatric Surgery, Lanzhou University Second Hospital, Lanzhou, China
| | - Weigao Pu
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Ewetse Paul Maswikiti
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Pengxian Tao
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Xuemei Li
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Dengfeng Wang
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Baohong Gu
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Yang Yu
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Lei Gao
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- The Second Clinical Medical College, Lanzhou University, Lanzhou, China
| | - Chengji Zhao
- Department of Pediatric Surgery, Lanzhou University Second Hospital, Lanzhou, China
| | - Hao Chen
- Department of Tumor Surgery, Lanzhou University Second Hospital, Lanzhou, China
- Key Laboratory of Digestive System Tumors of Gansu Province, Lanzhou, Gansu, China
| |
Collapse
|
33
|
Dysbiosis, gut-blood barrier rupture and autoimmune response in rheumatoid arthritis and schizophrenia. Reumatologia 2021; 59:180-187. [PMID: 34538945 PMCID: PMC8436801 DOI: 10.5114/reum.2021.107588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 06/17/2021] [Indexed: 12/14/2022] Open
Abstract
The primary cause of chronic autoimmune diseases is elusive both in somatic medicine and psychiatry. Examples of such conditions are rheumatoid arthritis and schizophrenic disorders. Immune disturbances occur in both diseases, but it is difficult to combine them into a meaningful pathogenetic model. The immunological hypothesis of schizophrenia is based on non-specific changes in the cytokine system and exponents of chronic inflammation in some patients. In rheumatoid arthritis the cytokine network is much better known than in schizophrenia, and interleukin-6, tumor necrosis factor or Janus kinases became a target of treatment. Microbiome dysbiosis and disturbances of the blood–gut barrier may be a new hypothesis of the pathogenesis of somatic and psychiatric diseases. The purpose of this narrative review was to show, using the example of two chronic diseases – rheumatoid arthritis and schizophrenic disorders – that disturbances in the blood barrier of the intestine can be a common mechanism of somatic and mental disorders. The paper presents the current state of knowledge on the hypothetical relationship between microbiome dysbiosis and the pathogenesis of schizophrenia and rheumatoid arthritis. In conclusion, in the light of discoveries regarding the microbiome–gut–brain axis the immunological model of rheumatoid arthritis and schizophrenia formation may gain importance and contribute to the creation of new strategies for causal treatment of these still incurable diseases.
Collapse
|
34
|
Zheng SY, Li HX, Xu RC, Miao WT, Dai MY, Ding ST, Liu HD. Potential roles of gut microbiota and microbial metabolites in Parkinson's disease. Ageing Res Rev 2021; 69:101347. [PMID: 33905953 DOI: 10.1016/j.arr.2021.101347] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 04/06/2021] [Accepted: 04/22/2021] [Indexed: 02/07/2023]
Abstract
Parkinson's disease (PD) is a complicated neurodegenerative disease attributed to multifactorial changes. However, its pathological mechanism remains undetermined. Accumulating evidence has revealed the emerging functions of gut microbiota and microbial metabolites, which can affect both the enteric nervous system and the central nervous system via the microbiota-gut-brain axis. Accordingly, intestinal dysbiosis might be closely associated with PD. This review explores alterations to gut microbiota, correlations with clinical manifestations of PD, and briefly probes the underlying mechanisms. Next, the highly controversial roles of microbial metabolites including short-chain fatty acids (SCFAs), H2 and H2S are discussed. Finally, the pros and cons of the current treatments for PD, including those targeting microbiota, are assessed. Advancements in research techniques, further studies on levels of specific strains and longitudinal prospective clinical trials are urgently needed for the identification of early diagnostic markers and the development of novel therapeutic approaches for PD.
Collapse
|
35
|
Severance EG, Leister F, Lea A, Yang S, Dickerson F, Yolken RH. Complement C4 associations with altered microbial biomarkers exemplify gene-by-environment interactions in schizophrenia. Schizophr Res 2021; 234:87-93. [PMID: 33632634 PMCID: PMC8373622 DOI: 10.1016/j.schres.2021.02.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 02/04/2021] [Accepted: 02/08/2021] [Indexed: 12/18/2022]
Abstract
Schizophrenia is a complex brain disorder with genetic and environmental factors contributing to its etiology. Complement C4 genes are schizophrenia susceptibility loci and are activated in response to infections and gut microbiome imbalances. We hypothesize that C4 genetic susceptibility predisposes individuals to neuropathological effects from pathogen exposures or a microbiome in dysbiosis. In 214 individuals with schizophrenia and 123 non-psychiatric controls, we examined C4 gene copy number and haplotype groups for associations with schizophrenia and microbial plasma biomarkers. C4A copy number and haplotypes containing HERV-K insertions (C4A-long; C4AL-C4AL) conferred elevated odds ratios for schizophrenia diagnoses (OR 1.58-2.56, p < 0.0001), while C4B-short (C4BS) haplogroups conferred decreased odds (OR 0.43, p < 0.0001). Haplogroup-microbe combinations showed extensive associations with schizophrenia including C4AL with Candida albicans IgG (OR 2.16, p < 0.0005), C4AL-C4BL with cytomegalovirus (CMV) IgG (OR 1.79, p < 0.008), C4BS with lipopolysaccharide-binding protein (LBP) (OR 1.18, p < 0.0001), and C4AL-C4AL with Toxoplasma gondii IgG (OR = 17.67, p < 0.0001). In controls, only one haplogroup-microbe combination was significant: C4BS with CMV IgG (OR 0.52, p < 0.02). In schizophrenia only, LBP and CMV IgG levels were inversely correlated with C4A and C4S copy numbers, respectively (R2 = 0.13-0.16, p < 0.0001). C4 haplogroups were associated with altered scores of cognitive functioning in both cases and controls and with psychiatric symptom scores in schizophrenia. Our findings link complement C4 genes with a susceptibility to infections and a dysbiotic microbiome in schizophrenia. These results support immune system mechanisms by which gene-environmental interactions may be operative in schizophrenia.
Collapse
Affiliation(s)
- Emily G Severance
- Stanley Division of Developmental Neurovirology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Flora Leister
- Stanley Division of Developmental Neurovirology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ashley Lea
- Stanley Division of Developmental Neurovirology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Shuojia Yang
- Stanley Division of Developmental Neurovirology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | | | - Robert H Yolken
- Stanley Division of Developmental Neurovirology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| |
Collapse
|
36
|
Perez-Muñoz ME, Sugden S, Harmsen HJM, 't Hart BA, Laman JD, Walter J. Nutritional and ecological perspectives of the interrelationships between diet and the gut microbiome in multiple sclerosis: Insights from marmosets. iScience 2021; 24:102709. [PMID: 34296070 PMCID: PMC8282968 DOI: 10.1016/j.isci.2021.102709] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Studies in experimental autoimmune encephalomyelitis (EAE), the animal model of multiple sclerosis, have shown potential links between diet components, microbiome composition, and modulation of immune responses. In this review, we reanalyze and discuss findings in an outbred marmoset EAE model in which a yogurt-based dietary supplement decreased disease frequency and severity. We show that although diet has detectable effects on the fecal microbiome, microbiome changes are more strongly associated with the EAE development. Using an ecological framework, we further show that the dominant factors influencing the gut microbiota were marmoset sibling pair and experimental time point. These findings emphasize challenges in assigning cause-and-effect relationships in studies of diet-microbiome-host interactions and differentiating the diet effects from other environmental, stochastic, and host-related factors. We advocate for animal experiments to be designed to allow causal inferences of the microbiota's role in pathology while considering the complex ecological processes that shape microbial communities.
Collapse
Affiliation(s)
- Maria Elisa Perez-Muñoz
- Department of Agricultural, Nutritional and Food Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - Scott Sugden
- Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
| | - Hermie J M Harmsen
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen 9700AE, The Netherlands
| | - Bert A 't Hart
- Department of Biomedical Sciences of Cells and Systems, Section of Molecular Neurobiology, University of Groningen, University Medical Center Groningen 9700AE, Groningen, The Netherlands.,Department Anatomy and Neuroscience, Amsterdam University Medical Center, Amsterdam 1081HV, The Netherlands
| | - Jon D Laman
- Department of Biomedical Sciences of Cells and Systems, Section of Molecular Neurobiology, University of Groningen, University Medical Center Groningen 9700AE, Groningen, The Netherlands.,Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen 9700AE, The Netherlands
| | - Jens Walter
- Department of Agricultural, Nutritional and Food Science, University of Alberta, Edmonton, AB T6G 2P5, Canada.,Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada.,APC Microbiome Ireland, School of Microbiology, and Department of Medicine, University College Cork - National University of Ireland, Cork T12 YT20, Ireland
| |
Collapse
|
37
|
Hohlfeld R. Correcting gut dysbiosis can ameliorate inflammation and promote remyelination in multiple sclerosis - Commentary. Mult Scler 2021; 27:1164-1165. [PMID: 34047222 PMCID: PMC8226368 DOI: 10.1177/13524585211018990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- R Hohlfeld
- Institut für klinische Neuroimmunologie, LMU Klinikum, Ludwig-Maximilians-Universität München, München, Germany/Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| |
Collapse
|
38
|
Artificial Sweeteners Negatively Regulate Pathogenic Characteristics of Two Model Gut Bacteria, E. coli and E. faecalis. Int J Mol Sci 2021; 22:ijms22105228. [PMID: 34063332 PMCID: PMC8156656 DOI: 10.3390/ijms22105228] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 12/11/2022] Open
Abstract
Artificial sweeteners (AS) are synthetic sugar substitutes that are commonly consumed in the diet. Recent studies have indicated considerable health risks which links the consumption of AS with metabolic derangements and gut microbiota perturbations. Despite these studies, there is still limited data on how AS impacts the commensal microbiota to cause pathogenicity. The present study sought to investigate the role of commonly consumed AS on gut bacterial pathogenicity and gut epithelium-microbiota interactions, using models of microbiota (Escherichia coli NCTC10418 and Enterococcus faecalis ATCC19433) and the intestinal epithelium (Caco-2 cells). Model gut bacteria were exposed to different concentrations of the AS saccharin, sucralose, and aspartame, and their pathogenicity and changes in interactions with Caco-2 cells were measured using in vitro studies. Findings show that sweeteners differentially increase the ability of bacteria to form a biofilm. Co-culture with human intestinal epithelial cells shows an increase in the ability of model gut bacteria to adhere to, invade and kill the host epithelium. The pan-sweet taste inhibitor, zinc sulphate, effectively blocked these negative impacts. Since AS consumption in the diet continues to increase, understanding how this food additive affects gut microbiota and how these damaging effects can be ameliorated is vital.
Collapse
|
39
|
Bhagavati S. Autoimmune Disorders of the Nervous System: Pathophysiology, Clinical Features, and Therapy. Front Neurol 2021; 12:664664. [PMID: 33935958 PMCID: PMC8079742 DOI: 10.3389/fneur.2021.664664] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 03/19/2021] [Indexed: 12/15/2022] Open
Abstract
Remarkable discoveries over the last two decades have elucidated the autoimmune basis of several, previously poorly understood, neurological disorders. Autoimmune disorders of the nervous system may affect any part of the nervous system, including the brain and spinal cord (central nervous system, CNS) and also the peripheral nerves, neuromuscular junction and skeletal muscle (peripheral nervous system, PNS). This comprehensive overview of this rapidly evolving field presents the factors which may trigger breakdown of self-tolerance and development of autoimmune disease in some individuals. Then the pathophysiological basis and clinical features of autoimmune diseases of the nervous system are outlined, with an emphasis on the features which are important to recognize for accurate clinical diagnosis. Finally the latest therapies for autoimmune CNS and PNS disorders and their mechanisms of action and the most promising research avenues for targeted immunotherapy are discussed.
Collapse
Affiliation(s)
- Satyakam Bhagavati
- Department of Neurology, Downstate Medical Center, State University of New York College of Medicine, New York, NY, United States
| |
Collapse
|
40
|
Miljković Đ, Jevtić B, Stojanović I, Dimitrijević M. ILC3, a Central Innate Immune Component of the Gut-Brain Axis in Multiple Sclerosis. Front Immunol 2021; 12:657622. [PMID: 33912185 PMCID: PMC8071931 DOI: 10.3389/fimmu.2021.657622] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 03/15/2021] [Indexed: 12/12/2022] Open
Abstract
Gut immune cells have been increasingly appreciated as important players in the central nervous system (CNS) autoimmunity in animal models of multiple sclerosis (MS). Among the gut immune cells, innate lymphoid cell type 3 (ILC3) is of special interest in MS research, as they represent the innate cell counterpart of the major pathogenic cell population in MS, i.e. T helper (Th)17 cells. Importantly, these cells have been shown to stimulate regulatory T cells (Treg) and to counteract pathogenic Th17 cells in animal models of autoimmune diseases. Besides, they are also well known for their ability to stabilize the intestinal barrier and to shape the immune response to the gut microbiota. Thus, proper maintenance of the intestinal barrier and the establishment of the regulatory milieu in the gut performed by ILC3 may prevent activation of CNS antigen-specific Th17 cells by the molecular mimicry. Recent findings on the role of ILC3 in the gut-CNS axis and their relevance for MS pathogenesis will be discussed in this paper. Possibilities of ILC3 functional modulation for the benefit of MS patients will be addressed, as well.
Collapse
Affiliation(s)
- Đorđe Miljković
- Department of Immunology, Institute for Biological Research "Siniša Stanković" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Bojan Jevtić
- Department of Immunology, Institute for Biological Research "Siniša Stanković" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Ivana Stojanović
- Department of Immunology, Institute for Biological Research "Siniša Stanković" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Mirjana Dimitrijević
- Department of Immunology, Institute for Biological Research "Siniša Stanković" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| |
Collapse
|
41
|
Abstract
A major feature of neurodegeneration is disruption of central nervous system homeostasis, during which microglia play diverse roles. In the central nervous system, microglia serve as the first line of immune defense and function in synapse pruning, injury repair, homeostasis maintenance, and regulation of brain development through scavenging and phagocytosis. Under pathological conditions or various stimulations, microglia proliferate, aggregate, and undergo a variety of changes in cell morphology, immunophenotype, and function. This review presents the features of microglia, especially their diversity and ability to change dynamically, and reinterprets their role as sensors for multiple stimulations and as effectors for brain aging and neurodegeneration. This review also summarizes some therapeutic approaches for neurodegenerative diseases that target microglia.
Collapse
Affiliation(s)
- Yu Xu
- Department of Anesthesiology, International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Embryo Original Disease, Shanghai Municipal Key Clinical Specialty; Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ming-Zhu Jin
- Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ze-Yong Yang
- Department of Anesthesiology, International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Embryo Original Disease, Shanghai Municipal Key Clinical Specialty, Shanghai, China
| | - Wei-Lin Jin
- Institute of Nano Biomedicine and Engineering, Department of Instrument Science and Engineering, Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education, School of Electronic Information and Electronic Engineering; National Centers for Translational Medicine, Shanghai Jiao Tong University, Shanghai; Shaanxi Key Laboratory of Brain Disorders & Institute of Basic and Translational Medicine, Xi'an Medical University, Xi'an, Shaanxi Province, China
| |
Collapse
|
42
|
Ullah H, Tovchiga O, Daglia M, Khan H. Modulating Gut Microbiota: An Emerging Approach in the Prevention and Treatment of Multiple Sclerosis. Curr Neuropharmacol 2021; 19:1966-1983. [PMID: 33596808 PMCID: PMC9185793 DOI: 10.2174/1570159x19666210217084827] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 02/11/2021] [Accepted: 02/15/2021] [Indexed: 02/08/2023] Open
Abstract
Multiple sclerosis (MS) is a progressive neuromuscular disorder characterized by demyelination of neurons of the central nervous system (CNS). The pathogenesis of the disorder is described as an autoimmune attack targeting the myelin sheath of nerve cell axons in the CNS. Available treatments only reduce the risk of relapse, prolonging the remissions of neurological symptoms and halt the progression of the disorder. Among the new ways of targeting neurological disorders, including MS, there is modulation of gut microbiota since the link between gut microbiota has been rethought within the term gut-brain axis. Gut microbiota is known to help the body with essential functions such as vitamin production and positive regulation of immune, inflammatory, and metabolic pathways. High consumption of saturated fatty acids, gluten, salt, alcohol, artificial sweeteners, or antibiotics is the responsible factor for causing gut dysbiosis. The latter can lead to dysregulation of immune and inflammatory pathways, which eventually results in leaky gut syndrome, systemic inflammation, autoimmune reactions, and increased susceptibility to infections. In modern medicine, scientists have mostly focused on the modulation of gut microbiota in the development of novel and effective therapeutic strategies for numerous disorders, with probiotics and prebiotics being the most widely studied in this regard. Several pieces of evidence from preclinical and clinical studies have supported the positive impact of probiotic and/or prebiotic intake on gut microbiota and MS. This review aims to link gut dysbiosis with the development/progression of MS, and the potential of modulation of gut microbiota in the therapeutics of the disease.
Collapse
Affiliation(s)
| | | | - Maria Daglia
- Address correspondence to this author at the Department of Pharmacy, University of Naples Federico II, Naples 80131, Italy, International Research Center for Food Nutrition and Safety, Jiangsu University, Zhenjiang212013, China; E-mail:
| | | |
Collapse
|
43
|
Zhu X, Yan S, Yuan F, Wan S. The Applications of Nanopore Sequencing Technology in Pathogenic Microorganism Detection. THE CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY = JOURNAL CANADIEN DES MALADIES INFECTIEUSES ET DE LA MICROBIOLOGIE MEDICALE 2020; 2020:6675206. [PMID: 33488885 PMCID: PMC7790562 DOI: 10.1155/2020/6675206] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/04/2020] [Accepted: 12/18/2020] [Indexed: 12/23/2022]
Abstract
Infectious diseases are major threats to human health and lead to a serious public health burden. The emergence of new pathogens and the mutation of known pathogens challenge our ability to diagnose and control infectious diseases. Nanopore sequencing technology exhibited versatile applications in pathogenic microorganism detection due to its flexible data throughput. This review article introduced the applications of nanopore sequencing in clinical microbiology and infectious diseases management, including the monitoring of emerging infectious diseases outbreak, identification of pathogen drug resistance, and disease-related microbial communities characterization.
Collapse
Affiliation(s)
- Xiaojian Zhu
- Center for Molecular Pathology, Department of Basic Medicine, Gannan Medical University, Ganzhou 341000, China
| | - Shanshan Yan
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University, Ganzhou 341000, China
- Department of Publication Health and Health Management, Gannan Medical University, Ganzhou 341000, China
| | - Fenghua Yuan
- Center for Molecular Pathology, Department of Basic Medicine, Gannan Medical University, Ganzhou 341000, China
| | - Shaogui Wan
- Center for Molecular Pathology, Department of Basic Medicine, Gannan Medical University, Ganzhou 341000, China
| |
Collapse
|
44
|
Gut microbiome improves postoperative cognitive function by decreasing permeability of the blood-brain barrier in aged mice. Brain Res Bull 2020; 164:249-256. [DOI: 10.1016/j.brainresbull.2020.08.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Revised: 07/31/2020] [Accepted: 08/18/2020] [Indexed: 12/12/2022]
|
45
|
Tong J, Satyanarayanan SK, Su H. Nutraceuticals and probiotics in the management of psychiatric and neurological disorders: A focus on microbiota-gut-brain-immune axis. Brain Behav Immun 2020; 90:403-419. [PMID: 32889082 DOI: 10.1016/j.bbi.2020.08.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 08/20/2020] [Accepted: 08/26/2020] [Indexed: 12/12/2022] Open
Affiliation(s)
- Jiaqi Tong
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao
| | - Senthil Kumaran Satyanarayanan
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao
| | - Huanxing Su
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao.
| |
Collapse
|
46
|
Perioperative neurocognitive dysfunction: thinking from the gut? Aging (Albany NY) 2020; 12:15797-15817. [PMID: 32805716 PMCID: PMC7467368 DOI: 10.18632/aging.103738] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 07/07/2020] [Indexed: 12/12/2022]
Abstract
With the aging of the world population, and improvements in medical and health technologies, there are increasing numbers of elderly patients undergoing anaesthesia and surgery. Perioperative neurocognitive dysfunction has gradually attracted increasing attention from academics. Very recently, 6 well-known journals jointly recommended that the term perioperative neurocognitive dysfunction (defined according to the Diagnostic and Statistical Manual of Mental Disorders, fifth edition) should be adopted to improve the quality and consistency of academic communications. Perioperative neurocognitive dysfunction currently includes preoperatively diagnosed cognitive decline, postoperative delirium, delayed neurocognitive recovery, and postoperative cognitive dysfunction. Increasing evidence shows that the gut microbiota plays a pivotal role in neuropsychiatric diseases, and in central nervous system functions via the microbiota-gut-brain axis. We recently reported that abnormalities in the composition of the gut microbiota might underlie the mechanisms of postoperative cognitive dysfunction and postoperative delirium, suggesting a critical role for the gut microbiota in perioperative neurocognitive dysfunction. This article therefore reviewed recent findings on the linkage between the gut microbiota and the underlying mechanisms of perioperative neurocognitive dysfunction.
Collapse
|
47
|
Ramakrishna C, Mendonca S, Ruegger PM, Kim JH, Borneman J, Cantin EM. Herpes simplex virus infection, Acyclovir and IVIG treatment all independently cause gut dysbiosis. PLoS One 2020; 15:e0237189. [PMID: 32760124 PMCID: PMC7410316 DOI: 10.1371/journal.pone.0237189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 07/21/2020] [Indexed: 02/07/2023] Open
Abstract
Herpes simplex virus 1 (HSV) is a ubiquitous human virus resident in a majority of the global population as a latent infection. Acyclovir (ACV), is the standard of care drug used to treat primary and recurrent infections, supplemented in some patients with intravenous immunoglobulin (IVIG) treatment to suppress infection and deleterious inflammatory responses. As many diverse medications have recently been shown to change composition of the gut microbiome, we used Illumina 16S rRNA gene sequencing to determine the effects of ACV and IVIG on the gut bacterial community. We found that HSV, ACV and IVIG can all independently disrupt the gut bacterial community in a sex biased manner when given to uninfected C57BL/6 mice. Treatment of HSV infected mice with ACV or IVIG alone or together revealed complex interactions between these drugs and infection that caused pronounced sex biased dysbiosis. ACV reduced Bacteroidetes levels in male but not female mice, while levels of the Anti-inflammatory Clostridia (AIC) were reduced in female but not male mice, which is significant as these taxa are associated with protection against the development of graft versus host disease (GVHD) in hematopoietic stem cell transplant (HSCT) patients. Gut barrier dysfunction is associated with GVHD in HSCT patients and ACV also decreased Akkermansia muciniphila, which is important for maintaining gut barrier functionality. Cumulatively, our data suggest that long-term prophylactic ACV treatment of HSCT patients may contribute to GVHD and also potentially impact immune reconstitution. These data have important implications for other clinical settings, including HSV eye disease and genital infections, where ACV is given long-term.
Collapse
Affiliation(s)
- Chandran Ramakrishna
- Department of Molecular Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Stacee Mendonca
- Department of Molecular Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Paul M. Ruegger
- Department of Microbiology and Plant Pathology, University of California, Riverside, California, United States of America
| | - Jane Hannah Kim
- Department of Microbiology and Plant Pathology, University of California, Riverside, California, United States of America
| | - James Borneman
- Department of Microbiology and Plant Pathology, University of California, Riverside, California, United States of America
- * E-mail: (EMC); (JB)
| | - Edouard M. Cantin
- Department of Molecular Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
- * E-mail: (EMC); (JB)
| |
Collapse
|
48
|
Regulation of immune-driven pathogenesis in Parkinson's disease by gut microbiota. Brain Behav Immun 2020; 87:890-897. [PMID: 31931152 DOI: 10.1016/j.bbi.2020.01.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 12/30/2019] [Accepted: 01/09/2020] [Indexed: 12/21/2022] Open
Abstract
Parkinson's disease (PD) is one of the most significant medical and social burdens of our time. The prevalence of PD increases with age and the number of individuals diagnosed with PD is expected to double from 6.9 million in 2015 to 14.2 million in 2040. To date, no drugs can stop the ongoing neurodegeneration caused by PD due to its unclear and complex pathogenic mechanisms. It has been wildly recognized that both gut microbiota and neuro-immunity are involved in the pathology of PD. In this review, we intend to provide a comprehensive overview of current knowledge on how gut microbiota involved in immune-driven pathogenesis of PD, and its potential as a new target of dietary and/or therapeutic interventions for PD.
Collapse
|
49
|
Zoledziewska M. A new mouse model for human immune system-related translational studies. Mult Scler Relat Disord 2020; 43:102213. [PMID: 32474287 DOI: 10.1016/j.msard.2020.102213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 04/28/2020] [Accepted: 05/17/2020] [Indexed: 11/19/2022]
Affiliation(s)
- Magdalena Zoledziewska
- Institute of Genetic and Biomedical Research (IRGB), Italian National Research Council (CNR), Sardinia, Italy
| |
Collapse
|
50
|
Waubant E, Pröbstel AK, Levy M, Hawkes CH, Giovannoni G, Lechner-Scott J, Tremlett H. The future of microbiome research in neuroinflammatory disorders. Mult Scler Relat Disord 2020; 40:102098. [PMID: 32312515 DOI: 10.1016/j.msard.2020.102098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
| | | | - Michael Levy
- UCSF Multiple Sclerosis Center, San Francisco, California, USA
| | | | | | | | - Helen Tremlett
- UCSF Multiple Sclerosis Center, San Francisco, California, USA
| |
Collapse
|