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Schumacher SM, Doyle WJ, Hill K, Ochoa-Repáraz J. Gut microbiota in multiple sclerosis and animal models. FEBS J 2024. [PMID: 38817090 DOI: 10.1111/febs.17161] [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: 10/17/2023] [Revised: 04/15/2024] [Accepted: 05/10/2024] [Indexed: 06/01/2024]
Abstract
Multiple sclerosis (MS) is a chronic central nervous system (CNS) neurodegenerative and neuroinflammatory disease marked by a host immune reaction that targets and destroys the neuronal myelin sheath. MS and correlating animal disease models show comorbidities, including intestinal barrier disruption and alterations of the commensal microbiome. It is accepted that diet plays a crucial role in shaping the microbiota composition and overall gastrointestinal (GI) tract health, suggesting an interplay between nutrition and neuroinflammation via the gut-brain axis. Unfortunately, poor host health and diet lead to microbiota modifications that could lead to significant responses in the host, including inflammation and neurobehavioral changes. Beneficial microbial metabolites are essential for host homeostasis and inflammation control. This review will highlight the importance of the gut microbiota in the context of host inflammatory responses in MS and MS animal models. Additionally, microbial community restoration and how it affects MS and GI barrier integrity will be discussed.
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Affiliation(s)
| | - William J Doyle
- Department of Biological Sciences, Boise State University, ID, USA
| | - Kristina Hill
- Department of Biological Sciences, Boise State University, ID, USA
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Elsayed NS, Aston P, Bayanagari VR, Shukla SK. The gut microbiome molecular mimicry piece in the multiple sclerosis puzzle. Front Immunol 2022; 13:972160. [PMID: 36045671 PMCID: PMC9420973 DOI: 10.3389/fimmu.2022.972160] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 07/25/2022] [Indexed: 12/11/2022] Open
Abstract
The etiological complexity of multiple sclerosis, an immune-mediated, neurodegenerative disease with multifactorial etiology is still elusive because of an incomplete understanding of the complex synergy between contributing factors such as genetic susceptibility and aberrant immune response. Recently, the disease phenotypes have also been shown to be associated with dysbiosis of the gut microbiome, a dynamic reservoir of billions of microbes, their proteins and metabolites capable of mimicring the autoantigens. Microbial factors could potentially trigger the neuroinflammation and symptoms of MS. In this perspective article, we discussed how microbial molecules resulting from a leaky gut might mimic a host’s autoantigen, potentially contributing to the disease disequilibrium. It further highlights the importance of targeting the gut microbiome for alternate therapeutic options for the treatment of MS.
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Affiliation(s)
- Noha S. Elsayed
- Center for Precision Medicine Research, Marshfield Clinic Research Institute, Marshfield, WI, United States
| | - Paula Aston
- Department of Neurology, Marshfield Clinic Health System, Marshfield, WI, United States
| | - Vishnu R. Bayanagari
- Center for Precision Medicine Research, Marshfield Clinic Research Institute, Marshfield, WI, United States
| | - Sanjay K. Shukla
- Center for Precision Medicine Research, Marshfield Clinic Research Institute, Marshfield, WI, United States
- *Correspondence: Sanjay K. Shukla,
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Rahman N, Begum S, Khan A, Afridi SG, Khayam Sahibzada MU, Atwah B, Alhindi Z, Khan H. An insight in Salmonella typhi associated autoimmunity candidates' prediction by molecular mimicry. Comput Biol Med 2022; 148:105865. [PMID: 35843194 DOI: 10.1016/j.compbiomed.2022.105865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/26/2022] [Accepted: 07/09/2022] [Indexed: 12/11/2022]
Abstract
Autoimmune diseases develop when the immune system targets healthy cells and tissues of an individual. In developing countries, S. typhi (a gram-negative pathogenic bacteria) remains a major public health issue. This study aimed to employ bioinformatics analyses to determine the 3D structural-based molecular mimicry and sequence of S. typhi and human host proteins. In addition, to classify possible antigenic microbial peptides homologous to human peptides and comprehend the molecular basis of S. typhi-related autoimmune disorders. Protein sequences were obtained from the NCBI database, and redundancy was removed using the CD-HIT tool. The BLASTp comparative sequence analysis was followed for molecular mimicry identification of human and S. typhi protein sequences. The PathDIP database was utilized to simulate essential physical relationships between proteins and curated pathways for metabolic processes. Subsequently, the IEDB database was used to find cross-reactive MHC class-II binding epitopes that could trigger an autoimmune reaction. SPARKS-X computational biology resource was also used to determine the structural homology between human and S. typhi peptides. The BLASTp study showed that S. typhi and the human host have several proteins holding considerable sequence similarities based on a set threshold of e ≤ 10-6 and bit score ≥100. The PathDIP putatively identified that these proteins enriched in a total of 68 metabolic pathways by a significant P-value (P < 0.005). The PSORTb analysis predicted that 26 out of these proteins are cytosolic, 1 predicted to be periplasmic protein, and 1 predicted to be localized in the cytoplasmic membrane. IEDB data analysis predicted many S.typhi and human homologs epitopes as a good binder of human HLA, i.e. DRB1*01:01, DPA1*03:01/DPB1*04:02, and DQA1*01:02/DQB1*06:02 with IC50 < 50 nM. Finally, the docking data demonstrated that homolog lead epitopes promisingly interact with HLA and immune TLR4 receptors by exhibiting the best docking scores and molecular interactions. The analyses ultimately identified several potential candidate proteins and peptides that could cause S.typhi infection-mediated autoimmune diseases in humans.
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Affiliation(s)
- Noor Rahman
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan
| | - Sara Begum
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan
| | - Asifullah Khan
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan.
| | - Sahib Gul Afridi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan
| | | | - Banan Atwah
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Zain Alhindi
- Laboratory Medicine Department, Faculty of Applied Medical Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Haroon Khan
- Department of Pharmacy, Abdul Wali Khan University Mardan, Mardan, 23200, Pakistan.
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Sterlin D, Larsen M, Fadlallah J, Parizot C, Vignes M, Autaa G, Dorgham K, Juste C, Lepage P, Aboab J, Vicart S, Maillart E, Gout O, Lubetzki C, Deschamps R, Papeix C, Gorochov G. Perturbed Microbiota/Immune Homeostasis in Multiple Sclerosis. NEUROLOGY-NEUROIMMUNOLOGY & NEUROINFLAMMATION 2021; 8:8/4/e997. [PMID: 33975914 PMCID: PMC8114833 DOI: 10.1212/nxi.0000000000000997] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 03/09/2021] [Indexed: 12/21/2022]
Abstract
Objective Based on animal models and human studies, there is now strong suspicion that host/microbiota mutualism in the context of gut microbial dysbiosis could influence immunity and multiple sclerosis (MS) evolution. Our goal was to seek evidence of deregulated microbiota-induced systemic immune responses in patients with MS. Methods We investigated gut and systemic commensal-specific antibody responses in healthy controls (n = 32), patients with relapsing-remitting MS (n = 30), and individuals with clinically isolated syndromes (CISs) (n = 15). Gut microbiota composition and diversity were compared between controls and patients by analysis of 16S ribosomal ribonucleic acid (rRNA) sequencing. Autologous microbiota and cultivable bacterial strains were used in bacterial flow cytometry assays to quantify autologous serum IgG and secretory IgA responses to microbiota. IgG-bound bacteria were sorted by flow cytometry and identified using 16S rRNA sequencing. Results We show that commensal-specific gut IgA responses are drastically reduced in patients with severe MS, disease severity being correlated with the IgA-coated fecal microbiota fraction (r = −0.647, p < 0.0001). At the same time, IgA-unbound bacteria elicit qualitatively broad and quantitatively increased serum IgG responses in patients with MS and CIS compared with controls (4.1% and 2.5% vs 1.9%, respectively, p < 0.001). Conclusions Gut and systemic microbiota/immune homeostasis are perturbed in MS. Our results argue that defective IgA responses in MS are linked to a breakdown of systemic tolerance to gut microbiota leading to an enhanced triggering of systemic IgG immunity against gut commensals occurring early in MS.
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Affiliation(s)
- Delphine Sterlin
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Martin Larsen
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Jehane Fadlallah
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Christophe Parizot
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Marina Vignes
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Gaëlle Autaa
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Karim Dorgham
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Catherine Juste
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Patricia Lepage
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Jennifer Aboab
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Savine Vicart
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Elisabeth Maillart
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Olivier Gout
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Catherine Lubetzki
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Romain Deschamps
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Caroline Papeix
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France
| | - Guy Gorochov
- From the Sorbonne Université (D.S., M.L., J.F., C.P., M.V., G.A., K.D., G.G.), Inserm, Centre d'Immunologie et des Maladies Infectieuses (CIMI-Paris), AP-HP Hôpital Pitié-Salpêtrière, France; Université Paris-Saclay (C.J., P.L.), INRAE, AgroParisTech, Micalis Institute, Jouy-en-Josas, France; Hôpital Ophtalmologique Adolphe de Rothschild (J.A., O.G., R.D.), Département de Neurologie, Paris, France; and Sorbonne Université (S.V., E.M., C.L., C.P.), Département de Neurologie, AP-HP Hôpital Pitié-Salpêtrière, Paris, France.
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5
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Gruca A, Ziemska-Legiecka J, Jarnot P, Sarnowska E, Sarnowski TJ, Grynberg M. Common low complexity regions for SARS-CoV-2 and human proteomes as potential multidirectional risk factor in vaccine development. BMC Bioinformatics 2021; 22:182. [PMID: 33832440 PMCID: PMC8027979 DOI: 10.1186/s12859-021-04017-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 02/01/2021] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The rapid spread of the COVID-19 demands immediate response from the scientific communities. Appropriate countermeasures mean thoughtful and educated choice of viral targets (epitopes). There are several articles that discuss such choices in the SARS-CoV-2 proteome, other focus on phylogenetic traits and history of the Coronaviridae genome/proteome. However none consider viral protein low complexity regions (LCRs). Recently we created the first methods that are able to compare such fragments. RESULTS We show that five low complexity regions (LCRs) in three proteins (nsp3, S and N) encoded by the SARS-CoV-2 genome are highly similar to regions from human proteome. As many as 21 predicted T-cell epitopes and 27 predicted B-cell epitopes overlap with the five SARS-CoV-2 LCRs similar to human proteins. Interestingly, replication proteins encoded in the central part of viral RNA are devoid of LCRs. CONCLUSIONS Similarity of SARS-CoV-2 LCRs to human proteins may have implications on the ability of the virus to counteract immune defenses. The vaccine targeted LCRs may potentially be ineffective or alternatively lead to autoimmune diseases development. These findings are crucial to the process of selection of new epitopes for drugs or vaccines which should omit such regions.
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Affiliation(s)
- Aleksandra Gruca
- Department of Computer Networks and Systems, Silesian University of Technology, Gliwice, Poland
| | | | - Patryk Jarnot
- Department of Computer Networks and Systems, Silesian University of Technology, Gliwice, Poland
| | - Elzbieta Sarnowska
- Department of Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | - Tomasz J Sarnowski
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Marcin Grynberg
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
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6
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The link “Cancer and autoimmune diseases” in the light of microbiota: Evidence of a potential culprit. Immunol Lett 2020; 222:12-28. [DOI: 10.1016/j.imlet.2020.03.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 02/20/2020] [Accepted: 03/03/2020] [Indexed: 12/15/2022]
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7
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Camara-Lemarroy CR, Metz L, Meddings JB, Sharkey KA, Wee Yong V. The intestinal barrier in multiple sclerosis: implications for pathophysiology and therapeutics. Brain 2019; 141:1900-1916. [PMID: 29860380 DOI: 10.1093/brain/awy131] [Citation(s) in RCA: 119] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/24/2018] [Indexed: 12/12/2022] Open
Abstract
Biological barriers are essential for the maintenance of homeostasis in health and disease. Breakdown of the intestinal barrier is an essential aspect of the pathophysiology of gastrointestinal inflammatory diseases, such as inflammatory bowel disease. A wealth of recent studies has shown that the intestinal microbiome, part of the brain-gut axis, could play a role in the pathophysiology of multiple sclerosis. However, an essential component of this axis, the intestinal barrier, has received much less attention. In this review, we describe the intestinal barrier as the physical and functional zone of interaction between the luminal microbiome and the host. Besides its essential role in the regulation of homeostatic processes, the intestinal barrier contains the gut mucosal immune system, a guardian of the integrity of the intestinal tract and the whole organism. Gastrointestinal disorders with intestinal barrier breakdown show evidence of CNS demyelination, and content of the intestinal microbiome entering into the circulation can impact the functions of CNS microglia. We highlight currently available studies suggesting that there is intestinal barrier dysfunction in multiple sclerosis. Finally, we address the mechanisms by which commonly used disease-modifying drugs in multiple sclerosis could alter the intestinal barrier and the microbiome, and we discuss the potential of barrier-stabilizing strategies, including probiotics and stabilization of tight junctions, as novel therapeutic avenues in multiple sclerosis.
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Affiliation(s)
- Carlos R Camara-Lemarroy
- Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Luanne Metz
- Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jonathan B Meddings
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Keith A Sharkey
- Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - V Wee Yong
- Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
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8
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Brown DG, Round JL. Friends in Low Places: Intestinal Commensals Limit Colitis through Molecular Mimicry. Cell 2019; 171:503-505. [PMID: 29053967 DOI: 10.1016/j.cell.2017.09.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Inflammatory bowel disease is thought to arise from inappropriate inflammation to gut bacteria, yet mechanisms preventing these responses remain elusive. In this issue of Cell, Nanjundappa et al. report that Bacteroides share an epitope with a pancreas-specific peptide that induces protective CD8+ T cells, identifying molecular mimicry as a mechanism to enforce tolerance in the gut.
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Affiliation(s)
- D Garrett Brown
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
| | - June L Round
- Department of Pathology, Division of Microbiology and Immunology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
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9
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Exploring Bacteroidetes: Metabolic key points and immunological tricks of our gut commensals. Dig Liver Dis 2018; 50:635-639. [PMID: 29650468 DOI: 10.1016/j.dld.2018.03.016] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Revised: 03/10/2018] [Accepted: 03/12/2018] [Indexed: 12/11/2022]
Abstract
Bacteroidetes are the largest phylum of Gram-negative bacteria inhabiting our gastrointestinal tract and are considered the leading players of the healthy state and sophisticated homeostasis safeguarded by gut microbiota. Furthermore, specific roles have been attributed to some Bacteroidetes genera in the development of immune dysregulation, systemic disease such as metabolic syndrome and also neurological disorders. Glycoproteins secretion, short fatty acids imbalance, toxins production and molecular mimicry are only a part of the functions exerted by these commensals interacting with the host. The aim of this review is to summarize the current knowledge on the recognized role of Bacteroidetes in physiological functions and pathological networks in order to define the needs for future research and clarify the potential role for targeted microbial therapies.
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10
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Stanisavljević S, Dinić M, Jevtić B, Đedović N, Momčilović M, Đokić J, Golić N, Mostarica Stojković M, Miljković Đ. Gut Microbiota Confers Resistance of Albino Oxford Rats to the Induction of Experimental Autoimmune Encephalomyelitis. Front Immunol 2018; 9:942. [PMID: 29770137 PMCID: PMC5942155 DOI: 10.3389/fimmu.2018.00942] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 04/16/2018] [Indexed: 12/16/2022] Open
Abstract
Albino Oxford (AO) rats are extremely resistant to induction of experimental autoimmune encephalomyelitis (EAE). EAE is an animal model of multiple sclerosis, a chronic inflammatory disease of the central nervous system (CNS), with established autoimmune pathogenesis. The autoimmune response against the antigens of the CNS is initiated in the peripheral lymphoid tissues after immunization of AO rats with CNS antigens. Subsequently, limited infiltration of the CNS occurs, yet without clinical sequels. It has recently become increasingly appreciated that gut-associated lymphoid tissues (GALT) and gut microbiota play an important role in regulation and propagation of encephalitogenic immune response. Therefore, modulation of AO gut microbiota by antibiotics was performed in this study. The treatment altered composition of gut microbiota in AO rats and led to a reduction in the proportion of regulatory T cells in Peyer's patches, mesenteric lymph nodes, and in lymph nodes draining the site of immunization. Upregulation of interferon-γ and interleukin (IL)-17 production was observed in the draining lymph nodes. The treatment led to clinically manifested EAE in AO rats with more numerous infiltrates and higher production of IL-17 observed in the CNS. Importantly, transfer of AO gut microbiota into EAE-prone Dark Agouti rats ameliorated the disease. These results clearly imply that gut microbiota is an important factor in AO rat resistance to EAE and that gut microbiota transfer is an efficacious way to treat CNS autoimmunity. These findings also support the idea that gut microbiota modulation has a potential as a future treatment of multiple sclerosis.
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Affiliation(s)
- Suzana Stanisavljević
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, University of Belgrade, Belgrade, Serbia
| | - Miroslav Dinić
- Laboratory for Molecular Microbiology, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Bojan Jevtić
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, University of Belgrade, Belgrade, Serbia
| | - Neda Đedović
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, University of Belgrade, Belgrade, Serbia
| | - Miljana Momčilović
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, University of Belgrade, Belgrade, Serbia
| | - Jelena Đokić
- Laboratory for Molecular Microbiology, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Nataša Golić
- Laboratory for Molecular Microbiology, Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | | | - Đorđe Miljković
- Department of Immunology, Institute for Biological Research “Siniša Stanković”, University of Belgrade, Belgrade, Serbia
- *Correspondence: Đorde Miljković,
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11
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Freedman SN, Shahi SK, Mangalam AK. The "Gut Feeling": Breaking Down the Role of Gut Microbiome in Multiple Sclerosis. Neurotherapeutics 2018; 15:109-125. [PMID: 29204955 PMCID: PMC5794701 DOI: 10.1007/s13311-017-0588-x] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) is a chronic neuroinflammatory disease of the central nervous system with unknown etiology. Recently, the gut microbiota has emerged as a potential factor in the development of MS, with a number of studies having shown that patients with MS exhibit gut dysbiosis. The gut microbiota helps the host remain healthy by regulating various functions, including food metabolism, energy homeostasis, maintenance of the intestinal barrier, inhibition of colonization by pathogenic organisms, and shaping of both mucosal and systemic immune responses. Alteration of the gut microbiota, and subsequent changes in its metabolic network that perturb this homeostasis, may lead to intestinal and systemic disorders such as MS. Here we discuss the findings of recent MS microbiome studies and potential mechanisms through which gut microbiota can predispose to, or protect against, MS. These findings highlight the need of an improved understanding of the interactions between the microbiota and host for developing therapies based on gut commensals with which to treat MS.
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Affiliation(s)
- Samantha N Freedman
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Shailesh K Shahi
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Ashutosh K Mangalam
- Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA.
- Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.
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12
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Brooks PT, Brakel KA, Bell JA, Bejcek CE, Gilpin T, Brudvig JM, Mansfield LS. Transplanted human fecal microbiota enhanced Guillain Barré syndrome autoantibody responses after Campylobacter jejuni infection in C57BL/6 mice. MICROBIOME 2017; 5:92. [PMID: 28789710 PMCID: PMC5547673 DOI: 10.1186/s40168-017-0284-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 06/05/2017] [Indexed: 05/10/2023]
Abstract
BACKGROUND Campylobacter jejuni is the leading antecedent infection to the autoimmune neuropathy Guillain-Barré syndrome (GBS), which is accompanied by an autoimmune anti-ganglioside antibody attack on peripheral nerves. Previously, we showed that contrasting immune responses mediate C. jejuni induced colitis and autoimmunity in interleukin-10 (IL-10)-deficient mice, dependent upon the infecting strain. Strains from colitis patients elicited T helper 1 (TH1)-dependent inflammatory responses while strains from GBS patients elicited TH2-dependent autoantibody production. Both syndromes were exacerbated by antibiotic depletion of the microbiota, but other factors controlling susceptibility to GBS are unknown. METHODS Using 16S rRNA gene high-throughput sequencing, we examined whether structure of the gut microbial community alters host (1) gastrointestinal inflammation or (2) anti-ganglioside antibody responses after infection with C. jejuni strains from colitis or GBS patients. We compared these responses in C57BL/6 mice with either (1) stable human gut microbiota (Humicrobiota) transplants or (2) conventional mouse microbiota (Convmicrobiota). RESULTS Inoculating germ-free C57BL/6 wild-type (WT) mice with a mixed human fecal slurry provided a murine model that stably passed its microbiota over >20 generations. Mice were housed in specific pathogen-free (SPF) facilities, while extra precautions of having caretakers wear sterile garb along with limited access ensured that no mouse pathogens were acquired. Humicrobiota conferred many changes upon the WT model in contrast to previous results, which showed only colonization with no disease after C. jejuni challenge. When compared to Convmicrobiota mice for susceptibility to C. jejuni enteric or GBS patient strains, infected Humicrobiota mice had (1) 10-100 fold increases in C. jejuni colonization of both strains, (2) pathologic change in draining lymph nodes but only mild changes in colon or cecal lamina propria, (3) significantly lower Th1/Th17-dependent anti-C. jejuni responses, (4) significantly higher IL-4 responses at 5 but not 7 weeks post infection (PI), (5) significantly higher Th2-dependent anti-C. jejuni responses, and (6) significantly elevated anti-ganglioside autoantibodies after C. jejuni infection. These responses in Humicrobiota mice were correlated with a dominant Bacteroidetes and Firmicutes microbiota. CONCLUSIONS These data demonstrate that Humicrobiota altered host-pathogen interactions in infected mice, increasing colonization and Th-2 and autoimmune responses in a C. jejuni strain-dependent manner. Thus, microbiota composition is another factor controlling susceptibility to GBS.
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Affiliation(s)
- Phillip T Brooks
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA
- Comparative Medicine and Integrative Biology, Michigan State University, East Lansing, MI, USA
- Institute for Integrative Toxicology, Michigan State University, East Lansing, MI, USA
| | - Kelsey A Brakel
- College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA
| | - Julia A Bell
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA
- College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA
| | - Christopher E Bejcek
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA
| | - Trey Gilpin
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA
| | - Jean M Brudvig
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA
- Comparative Medicine and Integrative Biology, Michigan State University, East Lansing, MI, USA
- College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA
| | - Linda S Mansfield
- Comparative Enteric Diseases Laboratory, Michigan State University, East Lansing, MI, USA.
- Comparative Medicine and Integrative Biology, Michigan State University, East Lansing, MI, USA.
- Institute for Integrative Toxicology, Michigan State University, East Lansing, MI, USA.
- College of Veterinary Medicine, Michigan State University, East Lansing, MI, USA.
- Department of Microbiology and Molecular Genetics, Michigan State University, 181 Food Safety Building; 1129 Farm Lane, East Lansing, MI, 48824, USA.
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13
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Mentis AFA, Dardiotis E, Grigoriadis N, Petinaki E, Hadjigeorgiou GM. Viruses and Multiple Sclerosis: From Mechanisms and Pathways to Translational Research Opportunities. Mol Neurobiol 2017; 54:3911-3923. [PMID: 28455696 DOI: 10.1007/s12035-017-0530-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 04/06/2017] [Indexed: 12/26/2022]
Abstract
Viruses are directly or indirectly implicated in multiple sclerosis (MS). Here, we review the evidence on the virus-related pathophysiology of MS, introduce common experimental models, and explore the ways in which viruses cause demyelination. By emphasizing knowledge gaps, we highlight future research directions for effective MS diagnostics and therapies: (i) identifying biomarkers for at-risk individuals, (ii) searching for direct evidence of specific causative viruses, (iii) establishing the contribution of host genetic factors and viruses, and (iv) investigating the contribution of immune regulation at extra-CNS sites. Research in these areas is likely to be facilitated by the application of high-throughput technologies, the development of systems-based bioinformatic approaches, careful selection of experimental models, and the acquisition of high-quality clinical material for tissue-based research.
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Affiliation(s)
- Alexios-Fotios A Mentis
- Department of Microbiology, University Hospital of Larissa, University of Thessaly, Larissa, Greece. .,The Johns Hopkins University, AAP, Baltimore, MD, USA.
| | - Efthimios Dardiotis
- Department of Neurology, University Hospital of Larissa, University of Thessaly, Larissa, Greece
| | - Nikolaos Grigoriadis
- B' Department of Neurology, Laboratory of Experimental Neurology and Neuroimmunology, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Efthimia Petinaki
- Department of Microbiology, University Hospital of Larissa, University of Thessaly, Larissa, Greece
| | - Georgios M Hadjigeorgiou
- Department of Neurology, University Hospital of Larissa, University of Thessaly, Larissa, Greece
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Zamanzadeh Z, Ataei M, Nabavi SM, Ahangari G, Sadeghi M, Sanati MH. In Silico Perspectives on the Prediction of the PLP's Epitopes involved in Multiple Sclerosis. IRANIAN JOURNAL OF BIOTECHNOLOGY 2017; 15:10-21. [PMID: 28959348 PMCID: PMC5582249 DOI: 10.15171/ijb.1356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 05/29/2016] [Accepted: 03/13/2017] [Indexed: 12/28/2022]
Abstract
BACKGROUND Multiple sclerosis (MS) is the most common autoimmune disease of the central nervous system (CNS). The main cause of the MS is yet to be revealed, but the most probable theory is based on the molecular mimicry that concludes some infections in the activation of T cells against brain auto-antigens that initiate the disease cascade. OBJECTIVES The Purpose of this research is the prediction of the auto-antigen potency of the myelin proteolipid protein (PLP) in multiple sclerosis. MATERIALS AND METHODS As there wasn't any tertiary structure of PLP available in the Protein Data Bank (PDB) and in order to characterize the structural properties of the protein, we modeled this protein using prediction servers. Meta prediction method, as a new perspective in silico, was performed to fi nd PLPs epitopes. For this purpose, several T cell epitope prediction web servers were used to predict PLPs epitopes against Human Leukocyte Antigens (HLA). The overlap regions, as were predicted by most web servers were selected as immunogenic epitopes and were subjected to the BLASTP against microorganisms. RESULTS Three common regions, AA58-74, AA161-177, and AA238-254 were detected as immunodominant regions through meta-prediction. Investigating peptides with more than 50% similarity to that of candidate epitope AA58-74 in bacteria showed a similar peptide in bacteria (mainly consistent with that of clostridium and mycobacterium) and spike protein of Alphacoronavirus 1, Canine coronavirus, and Feline coronavirus. These results suggest that cross reaction of the immune system to PLP may have originated from a bacteria or viral infection, and therefore molecular mimicry might have an important role in the progression of MS. CONCLUSIONS Through reliable and accurate prediction of the consensus epitopes, it is not necessary to synthesize all PLP fragments and examine their immunogenicity experimentally (in vitro). In this study, the best encephalitogenic antigens were predicted based on bioinformatics tools that may provide reliable results for researches in a shorter time and at a lower cost.
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Affiliation(s)
- Zahra Zamanzadeh
- Department of medical biotechnology. Institute of Medical Genetic, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, 14965/161 Iran
| | - Mitra Ataei
- Department of medical biotechnology. Institute of Medical Genetic, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, 14965/161 Iran
| | - Seyed Massood Nabavi
- Department of Neurology, Faculty of Public Health, Shahed University, Tehran, 18155/159, Iran
| | - Ghasem Ahangari
- Department of medical biotechnology. Institute of Medical Genetic, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, 14965/161 Iran
| | - Mehdi Sadeghi
- Department of medical biotechnology. Institute of Medical Genetic, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, 14965/161 Iran
| | - Mohammad Hosein Sanati
- Department of medical biotechnology. Institute of Medical Genetic, National Institute of Genetics Engineering and Biotechnology (NIGEB), Tehran, 14965/161 Iran
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15
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Bermúdez-Morales VH, Castrejon-Salgado R, Torres-Poveda K, de Jesús Flores-Rivera J, Flores-Aldana M, Madrid-Marina V, Hernández-Girón C. Papel de las enfermedades infecciosas en el desarrollo de la esclerosis múltiple: evidencia científica. NEUROLOGÍA ARGENTINA 2017. [PMCID: PMC7154617 DOI: 10.1016/j.neuarg.2016.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Introducción La esclerosis múltiple (EM) es el trastorno inflamatorio más común del sistema nervioso central (SNC) y la causa principal de discapacidad neurológica en adultos jóvenes. Los factores ambientales e infecciosos han sido fuertemente asociados al incremento de la ocurrencia de la enfermedad, hasta más del doble, en los últimos 10 años. En este artículo de revisión se describen los principales hallazgos reportados sobre la relación entre ciertas infecciones virales y bacterianas con la aparición y progresión de la EM. Métodos Se realizó un plan metodológico de búsqueda de artículos científicos relacionados con infección y EM, mediante la búsqueda de artículos científicos, principalmente publicados en inglés, en las plataformas virtuales de Pubmed, Medline y Cochrane. Para la búsqueda se utilizaron como palabras claves (términos MeSH): «virus, bacteria, autoimmune disease of the nervous system, multiple sclerosis». Se eligieron artículos publicados en revistas indexadas durante los últimos 15 años. Resultados Estudios epidemiológicos sugieren que la EM tiene un componente etiológico infeccioso que origina un proceso inflamatorio que puede contribuir a la iniciación o exacerbación de la enfermedad. Particularmente, la infección viral y los eventos de desmielinización en el SNC puede deberse a la penetración de un virus como el virus Epstein-Barr (EBV), a través del torrente sanguíneo, específicamente hacia el SNC. Por otro lado, las infecciones bacterianas crónicas pueden causar procesos de desmielinización en el SNC que agravan la enfermedad de EM. Conclusiones Este estudio contribuye a aportar evidencia científica donde se demuestra la multicausalidad implicada en la ocurrencia de la EM. Aún falta desarrollar más estudios epidemiológicos que demuestren y comprueben la relación y la implicación de agentes virales y bacterianos en el origen, el desarrollo y la severidad de la enfermedad.
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Affiliation(s)
- Victor Hugo Bermúdez-Morales
- Centro de Investigación sobre enfermedades infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - Ricardo Castrejon-Salgado
- Médico familiar, Centro de Investigación Biomédica del Sur, Instituto Mexicano del Seguro Social, Xochitepec, Morelos, México
| | - Kirvis Torres-Poveda
- Centro de Investigación sobre enfermedades infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - José de Jesús Flores-Rivera
- Médico neurólogo, Departamento de enfermedades desmielinizantes, Instituto nacional de neurología y neurocirugía, Ciudad de México (CDMX), México
| | - Mario Flores-Aldana
- Profesor investigador, Centro de Investigación en Salud Poblacional, CISP, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - Vicente Madrid-Marina
- Centro de Investigación sobre enfermedades infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - Carlos Hernández-Girón
- Profesor investigador, Centro de Investigación en Salud Poblacional, CISP, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
- Autor para correspondencia.
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16
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Zhang Y, Liu G, Duan Y, Han X, Dong H, Geng J. Prevalence of Small Intestinal Bacterial Overgrowth in Multiple Sclerosis: a Case-Control Study from China. J Neuroimmunol 2016; 301:83-87. [PMID: 27890460 DOI: 10.1016/j.jneuroim.2016.11.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 10/26/2016] [Accepted: 11/07/2016] [Indexed: 12/12/2022]
Abstract
OBJECTIVE It's hypothesized that gastrointestinal microbiota might play an important role in pathogenesis of multiple sclerosis (MS). The aim of the present study was to assess the prevalence of small intestinal bacterial overgrowth (SIBO) in MS patients compared with sex and age matched controls without MS. METHODS The present study was a case-control type, it included 118 patients with definitive MS and 118 age-sex matched controls. Progression of disability was assessed using the Multiple Sclerosis Severity Score (MSSS). All patients and controls underwent the glucose breath test to assess SIBO. RESULTS Forty-five of the 118 MS patients were SIBO positive (38.14%; 95%CI: 29.37%-46.90%) compared with 10 of 118 in the control group (8.47%; 95% confidence interval [CI]: 3.45%-13.50%); the difference was statistically significant (P<0.0001; Odds ratios (OR), 4.50; 95% CI, 2.38-8.50). In addition, 102 out of the 118 patients (86.4%) presented at least one GI symptom. Constipation (78.0%), Bloating (46.6%), and fecal incontinence (44.1%) were common. Multivariate analysis showed that expanded disability status scale (EDSS) score and MSSS were the only factors associated with the SIBO-positive status in MS patients (OR, 3.44; 95% CI, 1.56-6.99; and OR, 2.76; 95% CI, 1.42-4.94, respectively). CONCLUSION SIBO is highly prevalent in Chinese patients with MS. Further analytical work is required to establish a causal association between SIBO and MS risk and progression.
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Affiliation(s)
- Yongbo Zhang
- Department of Neurosurgery, Shouguang, City People's hospital, shouguang, Shandong Province, P.R. China
| | - Guoyi Liu
- Department of Neurology, The First Affiliated Hospital of Kunming Medical University, Kunming, ,Yunnan Province, P.R. China
| | - Yuanli Duan
- Department of Neurology, Dongping County people's Hospital, Taian, Shandong Province, P.R., China
| | - Xinwen Han
- Department of Neurosurgery, Shouguang, City People's hospital, shouguang, Shandong Province, P.R. China
| | - Huihua Dong
- Department of Neurosurgery, Shouguang, City People's hospital, shouguang, Shandong Province, P.R. China
| | - Jia Geng
- Department of Neurology, The First Affiliated Hospital of Kunming Medical University, Kunming, ,Yunnan Province, P.R. China.
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17
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Abdurasulova IN, Matsulevich AV, Tarasova EA, Kudryavtsev IV, Serebrjakova MK, Ermolenko EI, Bisaga GN, Klimenko VM, Suvorov AN. Enterococcus faecium strain L-3 and glatiramer acetate ameliorate experimental allergic encephalomyelitis in rats by affecting different populations of immune cells. Benef Microbes 2016; 7:719-729. [PMID: 27633171 DOI: 10.3920/bm2016.0018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The effect of probiotic Enterococcus faecium strain L-3 was studied in rats with experimental allergic encephalomyelitis (EAE). Glatiramer acetate (GA) was used as control drug. E. faecium strain L-3 and GA both were able to reduce the severity of EAE in a similar fashion. Both approaches increased the proportion of EAE resistant rats and rats with mild disease, prolonged the inductive phase of EAE and reduced the disease duration. Study of the phenotypes of immune cells in blood revealed the differences in immunoregulatory pathways that mediate the protective action of probiotic or GA treatment of EAE. The presence of pronounced protective and immunomodulating effects of the probiotic E. faecium strain L-3 opens an opportunity of its application for the treatment of multiple sclerosis.
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Affiliation(s)
- I N Abdurasulova
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,2 Saint-Petersburg State Pediatric Medical University, 2 Lithuanian St., 194100 St.-Petersburg, Russian Federation
| | - A V Matsulevich
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation
| | - E A Tarasova
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,3 Research laboratory 'Explana', 14a Academician Pavlov St., 197376 St.-Petersburg, Russian Federation
| | - I V Kudryavtsev
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,4 School of Biomedicine of Far Eastern Federal University, 8 Sukhanova St., 690950 Vladivostok, Russian Federation
| | - M K Serebrjakova
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,5 ITMO University, 49 Kronverksky Pr., 197101 St.-Petersburg, Russian Federation
| | - E I Ermolenko
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,6 Saint-Petersburg State University, 7-9 University Em., 199034 St.-Petersburg, Russian Federation
| | - G N Bisaga
- 7 Kirov Military Medical Academy, 6 Academician Lebedev St., 194044 St.-Petersburg, Russian Federation
| | - V M Klimenko
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation
| | - A N Suvorov
- 1 Institute of Experimental Medicine, 12 Academician Pavlov St., 197376 St.-Petersburg, Russian Federation.,6 Saint-Petersburg State University, 7-9 University Em., 199034 St.-Petersburg, Russian Federation
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18
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Mameli G, Cocco E, Frau J, Marrosu MG, Sechi LA. Epstein Barr Virus and Mycobacterium avium subsp. paratuberculosis peptides are recognized in sera and cerebrospinal fluid of MS patients. Sci Rep 2016; 6:22401. [PMID: 26956729 PMCID: PMC4783662 DOI: 10.1038/srep22401] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Accepted: 02/15/2016] [Indexed: 12/04/2022] Open
Abstract
Mycobacterium avium subsp. paratuberculosis (MAP) and Epstein-Barr virus (EBV) epitopes elicit a consistent humoral response in serum of multiple sclerosis patients, but the cross reactivity against the homologous myelin basic protein (MBP) and human interferon regulatory factor 5 (IRF5) has not been searched within the Cerebral Spinal Fluid (CSF). We evaluated in sera and CSF of patients with MS and with other neurological diseases (OND) the humoral response against EBV/MAP peptides and the IRF5/MBP. Our data showed that EBV and MAP peptides are able to induce a specific humoral immune response in MS patients compared to OND controls both in serum and in CSF. An intrathecal specific synthesis of IgG against MBP and their EBV and MAP homologous as indicated by the antibody index was observed in MS patients. The humoral response against EBV, MAP, MBP and IRF5 was significantly higher in MS patients compared to OND both in serum and in CSF. The higher presence of antibodies against MBP and their MAP and EBV homologous in CSF during relapses suggests a possible role of the pathogens in enhancing inflammation.
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Affiliation(s)
- Giuseppe Mameli
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia e Virologia, Università di Sassari, Viale San Pietro 43b, 07100 Sassari, Italy
| | - Eleonora Cocco
- Centro Sclerosi Multipla, Dipartimento di Sanità Pubblica Medicina Clinica e Molecolare, Università di Cagliari, Via Is Guadazzonis 2, 09126 Cagliari, Italy
| | - Jessica Frau
- Centro Sclerosi Multipla, Dipartimento di Sanità Pubblica Medicina Clinica e Molecolare, Università di Cagliari, Via Is Guadazzonis 2, 09126 Cagliari, Italy
| | - Maria Giovanna Marrosu
- Dipartimento di Scienze Mediche "Mario Aresu", Università di Cagliari, 09126 Cagliari, Italy
| | - Leonardo Antonio Sechi
- Dipartimento di Scienze Biomediche, Sezione di Microbiologia e Virologia, Università di Sassari, Viale San Pietro 43b, 07100 Sassari, Italy
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Croxford JL, Miyake S. Immunoregulation of multiple sclerosis by gut environmental factors. ACTA ACUST UNITED AC 2015. [DOI: 10.1111/cen3.12252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- J. Ludovic Croxford
- Department of Immunology; Juntendo University School of Medicine; Tokyo Japan
| | - Sachiko Miyake
- Department of Immunology; Juntendo University School of Medicine; Tokyo Japan
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Miller PG, Bonn MB, Franklin CL, Ericsson AC, McKarns SC. TNFR2 Deficiency Acts in Concert with Gut Microbiota To Precipitate Spontaneous Sex-Biased Central Nervous System Demyelinating Autoimmune Disease. THE JOURNAL OF IMMUNOLOGY 2015; 195:4668-84. [PMID: 26475926 DOI: 10.4049/jimmunol.1501664] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 09/20/2015] [Indexed: 02/07/2023]
Abstract
TNF-α antagonists provide benefit to patients with inflammatory autoimmune disorders such as Crohn's disease, rheumatoid arthritis, and ankylosing spondylitis. However, TNF antagonism unexplainably exacerbates CNS autoimmunity, including multiple sclerosis and neuromyelitis optica. The underlying mechanisms remain enigmatic. We demonstrate that TNFR2 deficiency results in female-biased spontaneous autoimmune CNS demyelination in myelin oligodendrocyte glycoprotein-specific 2D2 TCR transgenic mice. Disease in TNFR2(-/-) 2D2 mice was associated with CNS infiltration of T and B cells as well as increased production of myelin oligodendrocyte glycoprotein-specific IL-17, IFN-γ, and IgG2b. Attenuated disease in TNF(-/-) 2D2 mice relative to TNFR2(-/-) 2D2 mice identified distinctive roles for TNFR1 and TNFR2. Oral antibiotic treatment eliminated spontaneous autoimmunity in TNFR2(-/-) 2D2 mice to suggest role for gut microbiota. Illumina sequencing of fecal 16S rRNA identified a distinct microbiota profile in male TNFR2(-/-) 2D2 that was associated with disease protection. Akkermansia muciniphila, Sutterella sp., Oscillospira sp., Bacteroides acidifaciens, and Anaeroplasma sp. were selectively more abundant in male TNFR2(-/-) 2D2 mice. In contrast, Bacteroides sp., Bacteroides uniformis, and Parabacteroides sp. were more abundant in affected female TNFR2(-/-) 2D2 mice, suggesting a role in disease causation. Overall, TNFR2 blockade appears to disrupt commensal bacteria-host immune symbiosis to reveal autoimmune demyelination in genetically susceptible mice. Under this paradigm, microbes likely contribute to an individual's response to anti-TNF therapy. This model provides a foundation for host immune-microbiota-directed measures for the prevention and treatment of CNS-demyelinating autoimmune disorders.
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Affiliation(s)
- Patrick G Miller
- Laboratory of TGF-β Biology, Epigenetics, and Cytokine Regulation, Center for Cellular and Molecular Immunology, Department of Surgery, University of Missouri School of Medicine, Columbia, MO 65212
| | - Michael B Bonn
- Laboratory of TGF-β Biology, Epigenetics, and Cytokine Regulation, Center for Cellular and Molecular Immunology, Department of Surgery, University of Missouri School of Medicine, Columbia, MO 65212
| | - Craig L Franklin
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65201; and
| | - Aaron C Ericsson
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65201; and
| | - Susan C McKarns
- Laboratory of TGF-β Biology, Epigenetics, and Cytokine Regulation, Center for Cellular and Molecular Immunology, Department of Surgery, University of Missouri School of Medicine, Columbia, MO 65212; Department of Microbiology and Immunology, University of Missouri, Columbia, MO 65212
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Abstract
Chlamydia and antibodies to them were detected by serological, molecular biological, and culture methods in the sera and cerebrospinal fluid of patients with multiple sclerosis and in the reference groups of subjects without neurological diseases. Correlations between the agent presence in the biological fluids of patients and clinical characteristics of the disease were analyzed. C. pneumoniae were more incident in the biological liquids of patients with multiple sclerosis than in healthy volunteers. On the other hand, the incidence of the agent in the patients was not high and its presence did not correlate with the clinical manifestations. C. trachomatis was equally rare in the patients and volunteers. The studies indicated the existence of a group of patients infected by C. pneumoniae in the cohort of patients with multiple sclerosis, but the impact of this agent for the disease course remains unclear.
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Reuss B, Schroten H, Ishikawa H, Asif AR. Cross-reactivity of Antibodies Directed to the Gram-Negative Bacterium Neisseria gonorrhoeae With Heat Shock Protein 60 and ATP-Binding Protein Correlates to Reduced Mitochondrial Activity in HIBCPP Choroid Plexus Papilloma Cells. J Mol Neurosci 2015; 57:123-38. [PMID: 26080747 DOI: 10.1007/s12031-015-0585-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 05/19/2015] [Indexed: 01/22/2023]
Abstract
Antibacterial antibodies can cause neurologic side-effects by cross-reactivity with cellular antigens. Here we investigated interactions of antibodies to Neisseria gonorrhoeae (α-NG) - maternal infections by which increases the offspring's risk for later psychosis-with HIBCPP cells, a cell culture model of choroid plexus epithelium. Immunocytochemistry and Western blotting with α-NG, revealed organelle-like intracellular staining in HIBCPP cells, and labelling of several immunoreactive bands in cellular protein. Two-dimensional Western blotting revealed several immunopositive spots, most prominent of which were identified by mass spectrometry as mitochondrially localized proteins heat shock protein 60 (Hsp60) and ATP-binding protein β-subunit (ATPB). Similarly α-NG interacted with commercial samples of these proteins as revealed by Western blotting. Three alternative methods (JC-1, Janus green and MTT staining) revealed α-NG to cause in HIBCPP cells a significant decrease in mitochondrial activity, which could be reverted by neuroleptic drugs. Immunoreactivity of α-NG with choroid plexus epithelium in human post mortem samples suggests in vivo relevance of these findings. Finally, distinctly different staining patterns of antibodies against Neisseria meningitidis (α-NM), confirmed antibody specificity. To our knowledge this is the first report that α-NG cross-reactivity with Hsp60 and ATPB impairs mitochondrial activity in choroid plexus epithelial cells, pathogenetic relevance of which needs further clarification.
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Affiliation(s)
- B Reuss
- Institute for Neuroanatomy, University Medicine Göttingen (UMG), Kreuzbergring 36, 37075, Göttingen, Federal Republic of Germany,
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Abstract
Each individual harbours a unique set of commensal microorganisms, collectively referred to as the microbiota. Notably, these microorganisms exceed the number of cells in the human body by 10-fold. This finding has accelerated a shift in our understanding of human physiology, with the realization that traits necessary for health are both encoded and influenced by the human genome and the microbiota. Our understanding of the aetiology of complex diseases has, therefore, evolved with increasing awareness that the human microbiota has an active and critical role in maintaining health and inducing disease. Indeed, findings from bioinformatic studies indicate that the microbiota and microbiome have multiple effects on the innate and adaptive immune systems, with effects on infection, autoimmune disease and cancer. In this Review, we first address the important statistical and informatics aspects that should be considered when characterizing the composition of microbiota. We next highlight the effects of the microbiota on the immune system and the implications of these effects on organ failure and transplantation. Finally, we reflect on the future perspectives for studies of the microbiota, including novel diagnostic tests and therapeutics.
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De Felice KM, Novotna M, Enders FT, Faubion WA, Tremaine WJ, Kantarci OH, Raffals LE. Idiopathic inflammatory demyelinating disease of the central nervous system in patients with inflammatory bowel disease: retrospective analysis of 9095 patients. Aliment Pharmacol Ther 2015; 41:99-107. [PMID: 25348720 PMCID: PMC4489698 DOI: 10.1111/apt.12997] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Revised: 09/12/2014] [Accepted: 09/30/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND Anti-TNFα biologics induce and maintain remission in inflammatory bowel disease (IBD). Also, they have been reported to induce or unmask idiopathic inflammatory demyelinating disease of the central nervous system (IIDD). AIM To determine if anti-TNFα biologics increased the risk of IIDD in a large cohort of patients with IBD. METHODS We retrospectively identified adult patients referred to the Mayo Clinic, Rochester, MN for management of IBD from a five state capture area (Minnesota, Wisconsin, North Dakota, South Dakota and Iowa) between 1996 and 2010. IIDDs were identified in both Crohn's disease (CD) and ulcerative colitis (UC) patients with and without anti-TNFα exposure using the 2010 McDonald MRI criteria. The risk of IIDDs in patients with and without anti-TNFα exposure was estimated for IBD; CD and UC groups separately. RESULTS A total of 9095 patients with IBD were identified (4342 CD and 4753 UC). Four patients with CD with exposure to anti-TNFα agents (4/2054) and five patients with CD without anti-TNFα exposure (5/2288) developed a confirmed IIDD. One patient with UC with exposure to anti-TNFα agents (1/1371) and five patients with UC without anti-TNFα agents developed a confirmed IIDD (5/3382). The per cent of IIDDs in patients with and without anti-TNFα exposure was; IBD: 0.15% and 0.18% (RR = 0.83, 95% CI: 0.28-2.42; P = 0.729); CD: 0.19% and 0.22% (RR = 0.89, 95% CI: 0.24-3.31; P = 0.863); UC: 0.07% and 0.15% (RR = 0.49, 95% CI: 0.06-4.22; P = 0.510). CONCLUSION Anti-TNFα biologics do not appear to impact the risk of developing clinical idiopathic inflammatory demyelinating disease in patients with inflammatory bowel disease.
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Affiliation(s)
- K M De Felice
- Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
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Joscelyn J, Kasper LH. Digesting the emerging role for the gut microbiome in central nervous system demyelination. Mult Scler 2014; 20:1553-9. [PMID: 25070675 DOI: 10.1177/1352458514541579] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The fields of microbiology, immunology, neurology and nutrition are rapidly converging, as advanced sequencing and genomics-based methodologies have enabled the mapping out of the microbial diversity of humans for the first time. Bugs, guts, brains and behavior were once believed to be separate domains of clinical practice and research; however, recent observations in our understanding of the microbiome indicate that the boundaries between domains are becoming permeable. This permeability is multidirectional: Biological systems are operating simultaneously in a vastly complex and interconnected web. Understanding the microbiome-gut-brain axis will entail fleshing out the mechanisms by which transduction across each domain occurs, allowing us ultimately to appreciate the role of commensal organisms in shaping and modulating host immunity. This article will highlight animal and human research to date, as well as highlight directions for future research. We speculate that the gut microbiome is potentially the premier environmental risk factor mediating inflammatory central nervous system demyelination, in particular multiple sclerosis.
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Affiliation(s)
| | - Lloyd H Kasper
- Geisel School of Medicine, Dartmouth College, Hanover, NH, USA
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Mokarizadeh A, Abdollahi M, Rezvanfar MA, Rahmani MR. The possible role of peripherally generated cross-reactive IgG in breakdown of the blood–brain barrier and initiation of multiple sclerosis. JOURNAL OF MEDICAL HYPOTHESES AND IDEAS 2014. [DOI: 10.1016/j.jmhi.2013.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Arndt A, Hoffacker P, Zellmer K, Goecer O, Recks MS, Kuerten S. Conventional housing conditions attenuate the development of experimental autoimmune encephalomyelitis. PLoS One 2014; 9:e99794. [PMID: 24919069 PMCID: PMC4053466 DOI: 10.1371/journal.pone.0099794] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Accepted: 05/16/2014] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND The etiology of multiple sclerosis (MS) has remained unclear, but a causative contribution of factors outside the central nervous system (CNS) is conceivable. It was recently suggested that gut bacteria trigger the activation of CNS-reactive T cells and the development of demyelinative disease. METHODS C57BL/6 (B6) mice were kept either under specific pathogen free or conventional housing conditions, immunized with the myelin basic protein (MBP)-proteolipid protein (PLP) fusion protein MP4 and the development of EAE was clinically monitored. The germinal center size of the Peyer's patches was determined by immunohistochemistry in addition to the level of total IgG secretion which was assessed by ELISPOT. ELISPOT assays were also used to measure MP4-specific T cell and B cell responses in the Peyer's patches and the spleen. Ear swelling assays were performed to determine the extent of delayed-type hypersensitivity reactions in specific pathogen free and conventionally housed mice. RESULTS In B6 mice that were actively immunized with MP4 and kept under conventional housing conditions clinical disease was significantly attenuated compared to specific pathogen free mice. Conventionally housed mice displayed increased levels of IgG secretion in the Peyer's patches, while the germinal center formation in the gut and the MP4-specific TH17 response in the spleen were diminished after immunization. Accordingly, these mice displayed an attenuated delayed type hypersensitivity (DTH) reaction in ear swelling assays. CONCLUSIONS The data corroborate the notion that housing conditions play a substantial role in the induction of murine EAE and suggest that the presence of gut bacteria might be associated with a decreased immune response to antigens of lower affinity. This concept could be of importance for MS and calls for caution when considering the therapeutic approach to treat patients with antibiotics.
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Affiliation(s)
- Andreas Arndt
- Department of Anatomy I, University of Cologne, Cologne, Germany
| | - Peter Hoffacker
- Department of Anatomy I, University of Cologne, Cologne, Germany
| | | | - Oktay Goecer
- Department of Anatomy I, University of Cologne, Cologne, Germany
| | - Mascha S. Recks
- Department of Anatomy I, University of Cologne, Cologne, Germany
| | - Stefanie Kuerten
- Department of Anatomy and Cell Biology, University of Wuerzburg, Wuerzburg, Germany
- * E-mail:
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Vaughan K, Peters B, O'Connor KC, Martin R, Sette A. A molecular view of multiple sclerosis and experimental autoimmune encephalitis: what can we learn from the epitope data? J Neuroimmunol 2014; 267:73-85. [PMID: 24365494 PMCID: PMC4784960 DOI: 10.1016/j.jneuroim.2013.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 12/03/2013] [Accepted: 12/06/2013] [Indexed: 02/04/2023]
Abstract
An analysis to inventory all immune epitope data related to multiple sclerosis (MS) was performed using the Immune Epitope Database (IEDB). The analysis revealed that MS related data represent >20% of all autoimmune data, and that studies of EAE predominate; only 22% of the references describe human data. To date, >5800 unique peptides, analogs, mimotopes, and/or non-protein epitopes have been reported from 861 references, including data describing myelin-containing, as well as non-myelin antigens. This work provides a reference point for the scientific community of the universe of available data for MS-related adaptive immunity in the context of EAE and human disease.
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Affiliation(s)
- Kerrie Vaughan
- La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA, USA.
| | - Bjoern Peters
- La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA, USA
| | - Kevin C O'Connor
- Department of Neurology, Yale School of Medicine, 300 George Street, New Haven, CT 06511, USA; Human and Translational Immunology Program, Yale School of Medicine, 300 George Street, New Haven, CT 06511, USA
| | - Roland Martin
- Neuroimmunology and MS Research, Department of Neurology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Alessandro Sette
- La Jolla Institute for Allergy and Immunology, 9420 Athena Circle, La Jolla, CA, USA
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Carter CJ. Susceptibility genes are enriched in those of the herpes simplex virus 1/host interactome in psychiatric and neurological disorders. Pathog Dis 2013; 69:240-61. [PMID: 23913659 DOI: 10.1111/2049-632x.12077] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 07/11/2013] [Accepted: 07/24/2013] [Indexed: 12/22/2022] Open
Abstract
Herpes simplex virus 1 (HSV-1) can promote beta-amyloid deposition and tau phosphorylation, demyelination or cognitive deficits relevant to Alzheimer's disease or multiple sclerosis and to many neuropsychiatric disorders with which it has been implicated. A seroprevalence much higher than disease incidence has called into question any primary causal role. However, as also the case with risk-promoting polymorphisms (also present in control populations), any causal effects are likely to be conditional. During its life cycle, the virus binds to many proteins and modifies the expression of multiple genes creating a host/pathogen interactome involving 1347 host genes. This data set is heavily enriched in the susceptibility genes for multiple sclerosis (P = 1.3E-99) > Alzheimer's disease > schizophrenia > Parkinsonism > depression > bipolar disorder > childhood obesity > chronic fatigue > autism > and anorexia (P = 0.047) but not attention deficit hyperactivity disorder, a relationship maintained for genome-wide association study data sets in multiple sclerosis and Alzheimer's disease. Overlapping susceptibility gene/interactome data sets disrupt signalling networks relevant to each disease, suggesting that disease susceptibility genes may filter the attentions of the pathogen towards particular pathways and pathologies. In this way, the same pathogen could contribute to multiple diseases in a gene-dependent manner and condition the risk-promoting effects of the genes whose function it disrupts.
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Weinstock LB, Steinhoff M. Rosacea and small intestinal bacterial overgrowth: prevalence and response to rifaximin. J Am Acad Dermatol 2013; 68:875-6. [PMID: 23602178 DOI: 10.1016/j.jaad.2012.11.038] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Revised: 11/13/2012] [Accepted: 11/18/2012] [Indexed: 10/26/2022]
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Glyphosate’s Suppression of Cytochrome P450 Enzymes and Amino Acid Biosynthesis by the Gut Microbiome: Pathways to Modern Diseases. ENTROPY 2013. [DOI: 10.3390/e15041416] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Fungal infection in cerebrospinal fluid from some patients with multiple sclerosis. Eur J Clin Microbiol Infect Dis 2013; 32:795-801. [PMID: 23322279 DOI: 10.1007/s10096-012-1810-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 12/18/2012] [Indexed: 01/19/2023]
Abstract
Multiple sclerosis (MS) is the prototypical inflammatory disease of the central nervous system and spinal cord, leading to axonal demyelination of neurons. Recently, we have found a correlation between fungal infection and MS in peripheral blood of patients. The present work provides evidence of fungal infection in the cerebrospinal fluid (CSF) of some MS patients. Thus, fungal antigens can be demonstrated in CSF, as well as antibodies reacting against several Candida species. Comparison was made between CSF and blood serum for the presence of fungal antigens (proteins) and antibodies against different Candida spp. Analyses of both CSF and serum are complementary and serve to better evaluate for the presence of disseminated fungal infection. In addition, PCR analyses indicate the presence of DNA from different fungal species in CSF, depending on the patient analyzed. Overall, these findings support the notion that fungal infection can be demonstrated in CSF from some MS patients. This may constitute a risk factor in this disease and could also help in understanding the pathogenesis of MS.
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Alkhawajah MM, Caminero AB, Freeman HJ, Oger JJF. Multiple sclerosis and inflammatory bowel diseases: what we know and what we would need to know! Mult Scler 2012; 19:259-65. [PMID: 23027881 DOI: 10.1177/1352458512461393] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Multiple sclerosis (MS) is a demyelinating disorder of the central nervous system (CNS) but the causes have not been defined. The disease process appears to involve interplay between environmental factors and certain susceptibility genes. It is likely that the identification of the exact etiological mechanisms will permit the development of preventive and curative treatments. Evaluation of several diseases found to be more often associated than by chance alone may reveal clues to the etiology of those disorders. An association between MS and inflammatory bowel diseases (IBD) was suggested by the observation of an increased incidence of IBD among MS patients. A problem in the interpretation of the data rests, in part, with the observation that abnormal findings in brain magnetic resonance imaging (MRI) may be reported as MS in IBD patients. Defining the limits between incidental MRI findings and findings compatible with MS has resulted in further exploration of this possible association.
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Affiliation(s)
- Mona M Alkhawajah
- Multiple Sclerosis Clinic, University of British Columbia Hospital, Canada.
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Role of molecular mimicry and polyclonal cell activation in the induction of pathogenic β2-glycoprotein I-directed immune response in Balb/c mice upon hyperimmunization with tetanus toxoid. Immunol Res 2012; 56:20-31. [PMID: 22875539 DOI: 10.1007/s12026-012-8343-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
It is known that tetanus toxoid (TTd)-hyperimmunization induces increased titer of sera β2-glycoprotein I (β2GPI)-specific antibodies (Abs) in Balb/c mice. The concentrations of such induced anti-β2GPI Abs as well as their pathogenic potential are strongly influenced by the context of TTd application. β2GPI-specific immune response is established as a part of TTd-specific immune response by molecular mimicry mechanism due to structural homology between TTd and β2GPI. This finding is supported by the following facts: (1) cross-reactive Abs that recognize both TTd and β2GPI epitopes are present in Balb/c mice sera; (2) anti-TTd Abs secretion in splenic cultures is induced after β2GPI stimulation and vice versa. However, analyses of (1) IL-10 production following in vitro stimulation of immunized Balb/c mice splenocytes by TTd, β2GPI or glutaraldehyde-treated β2GPI and (2) specific impact of ConA and agonists of TLR2, TLR4, and TLR9 on anti-TTd and autoreactive Abs secretion strongly imply that these two branches of the TTd-induced immune response do not use identical cell populations and are regulated in a different way. Results presented in this paper describe that structural homology between foreign and self-antigens could focus mounted autoreactive immune response toward specific self-structure, but the context of antigen application, including a history of previous immune stimulations and adjuvants applied together with the antigen, are the main factors which determine the outcome of the induced immune response.
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Abbott DJ, Blanchfield JL, Martinson DA, Russell SC, Taslim N, Curtis AD, Mannie MD. Neuroantigen-specific, tolerogenic vaccines: GM-CSF is a fusion partner that facilitates tolerance rather than immunity to dominant self-epitopes of myelin in murine models of experimental autoimmune encephalomyelitis (EAE). BMC Immunol 2011; 12:72. [PMID: 22208499 PMCID: PMC3261124 DOI: 10.1186/1471-2172-12-72] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 12/30/2011] [Indexed: 01/24/2023] Open
Abstract
Background Vaccination strategies that elicit antigen-specific tolerance are needed as therapies for autoimmune disease. This study focused on whether cytokine-neuroantigen (NAg) fusion proteins could inhibit disease in chronic murine models of experimental autoimmune encephalomyelitis (EAE) and thus serve as potential therapeutic modalities for multiple sclerosis. Results A fusion protein comprised of murine GM-CSF as the N-terminal domain and the encephalitogenic MOG35-55 peptide as the C-terminal domain was tested as a tolerogenic, therapeutic vaccine (TTV) in the C57BL/6 model of EAE. Administration of GMCSF-MOG before active induction of EAE, or alternatively, at the onset of EAE blocked the development and progression of EAE. Covalent linkage of the GM-CSF and MOG35-55 domains was required for tolerogenic activity. Likewise, a TTV comprised of GM-CSF and PLP139-151 was a tolerogen in the SJL model of EAE. Conclusion These data indicated that fusion proteins containing GM-CSF coupled to myelin auto-antigens elicit tolerance rather than immunity.
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Affiliation(s)
- Derek J Abbott
- The Department of Microbiology and Immunology, East Carolina University, Greenville, NC, USA
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Liao WWP, Arthur JW. Predicting peptide binding affinities to MHC molecules using a modified semi-empirical scoring function. PLoS One 2011; 6:e25055. [PMID: 21966412 PMCID: PMC3178607 DOI: 10.1371/journal.pone.0025055] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Accepted: 08/23/2011] [Indexed: 12/19/2022] Open
Abstract
The Major Histocompatibility Complex (MHC) plays an important role in the human immune system. The MHC is involved in the antigen presentation system assisting T cells to identify foreign or pathogenic proteins. However, an MHC molecule binding a self-peptide may incorrectly trigger an immune response and cause an autoimmune disease, such as multiple sclerosis. Understanding the molecular mechanism of this process will greatly assist in determining the aetiology of various diseases and in the design of effective drugs. In the present study, we have used the Fresno semi-empirical scoring function and modify the approach to the prediction of peptide-MHC binding by using open-source and public domain software. We apply the method to HLA class II alleles DR15, DR1, and DR4, and the HLA class I allele HLA A2. Our analysis shows that using a large set of binding data and multiple crystal structures improves the predictive capability of the method. The performance of the method is also shown to be correlated to the structural similarity of the crystal structures used. We have exposed some of the obstacles faced by structure-based prediction methods and proposed possible solutions to those obstacles. It is envisaged that these obstacles need to be addressed before the performance of structure-based methods can be on par with the sequence-based methods.
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Affiliation(s)
- Webber W. P. Liao
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Jonathan W. Arthur
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- Children's Medical Research Institute, Sydney, New South Wales, Australia
- * E-mail:
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Carter CJ. Pathogen and autoantigen homologous regions within the cystic fibrosis transmembrane conductance regulator (CFTR) protein suggest an autoimmune treatable component of cystic fibrosis. ACTA ACUST UNITED AC 2011; 62:197-214. [DOI: 10.1111/j.1574-695x.2011.00803.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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39
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Carter CJ. Epstein-Barr and other viral mimicry of autoantigens, myelin and vitamin D-related proteins and of EIF2B, the cause of vanishing white matter disease: massive mimicry of multiple sclerosis relevant proteins by the Synechococcus phage. Immunopharmacol Immunotoxicol 2011; 34:21-35. [PMID: 21486137 DOI: 10.3109/08923973.2011.572262] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The Epstein-Barr virus expresses proteins containing numerous short consensi (identical pentapeptides at least, or longer gapped consensi) that are identical to those in 16 multiple sclerosis autoantigens or in the products of multiple sclerosis susceptibility genes. Other viruses implicated in multiple sclerosis also display such mimicry and the Synechococcus phage was identified as a novel and major contributor to this phenomenon. Cyanobacteria hosts of Synechococcus phage favor temperate climes, in line with multiple sclerosis distribution, and bacterial and phage ecology accords closely with multiple sclerosis epidemiology. Bovine, ovine or canine viral proteins were also identified as autoantigen homologues, in line with epidemiological data linking multiple sclerosis to cattle density, sheep contact and dog ownership. Viral proteins align with known autoantigens, other myelin and vitamin D-related proteins and the translation initiation factor EIF2B, which is implicated in vanishing white matter disease. These data suggest that the autoantigens in multiple sclerosis, which causes demyelination in animal models, may be generated by antibodies raised to viral protein homologues. Multiple autoantibodies may cause multiple sclerosis via protein knockdown and immune activation. Their selective removal may be of clinical benefit as already suggested by promising results using plasmapheresis or immunoadsorption in certain multiple sclerosis patients.
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Affiliation(s)
- C J Carter
- PolygenicPathways, Saint Leonards-on-sea, East Sussex, UK.
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Tlaskalová-Hogenová H, Stěpánková R, Kozáková H, Hudcovic T, Vannucci L, Tučková L, Rossmann P, Hrnčíř T, Kverka M, Zákostelská Z, Klimešová K, Přibylová J, Bártová J, Sanchez D, Fundová P, Borovská D, Srůtková D, Zídek Z, Schwarzer M, Drastich P, Funda DP. The role of gut microbiota (commensal bacteria) and the mucosal barrier in the pathogenesis of inflammatory and autoimmune diseases and cancer: contribution of germ-free and gnotobiotic animal models of human diseases. Cell Mol Immunol 2011; 8:110-20. [PMID: 21278760 PMCID: PMC4003137 DOI: 10.1038/cmi.2010.67] [Citation(s) in RCA: 487] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Accepted: 12/02/2010] [Indexed: 02/06/2023] Open
Abstract
Metagenomic approaches are currently being used to decipher the genome of the microbiota (microbiome), and, in parallel, functional studies are being performed to analyze the effects of the microbiota on the host. Gnotobiological methods are an indispensable tool for studying the consequences of bacterial colonization. Animals used as models of human diseases can be maintained in sterile conditions (isolators used for germ-free rearing) and specifically colonized with defined microbes (including non-cultivable commensal bacteria). The effects of the germ-free state or the effects of colonization on disease initiation and maintenance can be observed in these models. Using this approach we demonstrated direct involvement of components of the microbiota in chronic intestinal inflammation and development of colonic neoplasia (i.e., using models of human inflammatory bowel disease and colorectal carcinoma). In contrast, a protective effect of microbiota colonization was demonstrated for the development of autoimmune diabetes in non-obese diabetic (NOD) mice. Interestingly, the development of atherosclerosis in germ-free apolipoprotein E (ApoE)-deficient mice fed by a standard low-cholesterol diet is accelerated compared with conventionally reared animals. Mucosal induction of tolerance to allergen Bet v1 was not influenced by the presence or absence of microbiota. Identification of components of the microbiota and elucidation of the molecular mechanisms of their action in inducing pathological changes or exerting beneficial, disease-protective activities could aid in our ability to influence the composition of the microbiota and to find bacterial strains and components (e.g., probiotics and prebiotics) whose administration may aid in disease prevention and treatment.
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deLuca LES, Pikor NB, O'Leary J, Galicia-Rosas G, Ward LA, Defreitas D, Finlay TM, Ousman SS, Osborne LR, Gommerman JL. Substrain differences reveal novel disease-modifying gene candidates that alter the clinical course of a rodent model of multiple sclerosis. THE JOURNAL OF IMMUNOLOGY 2010; 184:3174-85. [PMID: 20173032 DOI: 10.4049/jimmunol.0902881] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Experimental autoimmune encephalomyelitis (EAE) is a rodent model of multiple sclerosis that is executed in animals by immunization with myelin Ag in adjuvant. The SJL/J autoimmune-prone strain of mouse has been used to model relapsing-remitting multiple sclerosis. However, significant variations in peak scores, timing of onset, and incidence are observed among laboratories, with the postacute (relapse) phase of the disease exhibiting significant inconsistency. We characterized two substrains of SJL/J mice that exhibit profoundly different EAE disease parameters. Induction of EAE in the first SJL/J substrain resulted in many cases of chronic EAE that was dominated by an aggressive B cell response to the immunizing Ag and to endogenous CNS Ags. In contrast, the other SJL/J substrain exhibited a relapsing-remitting form of EAE concomitant with an elevated number of cytokine-producing CD4(+) T cells in the CNS. Exploiting these interstrain differences, we performed a genome-wide copy number analysis on the two disparate SJL/J substrains and discovered numerous gene-dosage differences. In particular, one inflammation-associated gene, Naip1, was present at a higher copy number in the SJL/J substrain that exhibited relapsing-remitting EAE. These results demonstrate that substrain differences, perhaps at the level of genomic copy number, can account for variability in the postacute phase of EAE and may drive chronic versus relapsing disease.
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Ahram M, El-Omar A, Baho Y, Lubad MA. Association between human herpesvirus 6 and occurrence of multiple sclerosis among Jordanian patients. Acta Neurol Scand 2009; 120:430-5. [PMID: 19519805 DOI: 10.1111/j.1600-0404.2009.01187.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Multiple sclerosis (MS) is hypothesized to be caused by an infectious agent that initiates an autoimmune reaction. Among the infectious agents linked to MS is human herpesvirus 6 (HHV-6). Due to the high occurrence of MS among Jordanian population and the deficiency of MS studies in Jordan, the prevalence of HHV-6 in sera and cerebrospinal fluids (CSFs) of 36 MS patients was investigated. MATERIALS AND METHODS To increase the sensitivity of detection, nested polymerase chain reaction was utilized. RESULTS Although we were able to detect HHV-6 DNA in serum samples of 26% MS patients, no significant difference was found when compared to control individuals. In addition, lack of association between MS and presence of viral DNA in CSF samples was observed. Even within the analyzed MS patient population, an association of HHV-6 and MS in terms of gender, type of diagnosis, symptoms and disease score was not identified among Jordanian patients. CONCLUSIONS Although these results indicate lack of apparent association between HHV-6 to MS among Jordanian patients, heterogeneity related to genetic polymorphism as well as geographical distribution of the disease and of pathogens may be of significance.
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Affiliation(s)
- M Ahram
- Department of Pharmacology and Physiology, Faculty of Medicine, Mu'tah University, PO Box 7, Mu'tah, Karak 61710, Jordan.
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Deretzi G, Kountouras J, Grigoriadis N, Zavos C, Chatzigeorgiou S, Koutlas E, Tsiptsios I. From the "little brain" gastrointestinal infection to the "big brain" neuroinflammation: a proposed fast axonal transport pathway involved in multiple sclerosis. Med Hypotheses 2009; 73:781-7. [PMID: 19467574 DOI: 10.1016/j.mehy.2009.04.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2009] [Revised: 04/04/2009] [Accepted: 04/08/2009] [Indexed: 12/14/2022]
Abstract
The human central nervous system (CNS) is targeted by different pathogens which, apart from pathogens' intranasal inoculation or trafficking into the brain through infected blood cells, may use a distinct pathway to bypass the blood-brain barrier by using the gastrointestinal tract (GIT) retrograde axonal transport through sensory or motor fibres. The recent findings regarding the enteric nervous system (often called the "little brain") similarities with CNS and GIT axonal transport of infections resulting in CNS neuroinflammation are mainly reviewed in this article. We herein propose that the GIT is the vulnerable area through which pathogens (such as Helicobacter pylori) may influence the brain and induce multiple sclerosis pathologies, mainly via the fast axonal transport by the afferent neurones connecting the GIT to brain.
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Affiliation(s)
- Georgia Deretzi
- Department of Neurology, Papageorgiou Regional General Hospital, Thessaloniki, Greece
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Pordeus V, Szyper-Kravitz M, Levy RA, Vaz NM, Shoenfeld Y. Infections and autoimmunity: a panorama. Clin Rev Allergy Immunol 2008; 34:283-99. [PMID: 18231878 PMCID: PMC7090595 DOI: 10.1007/s12016-007-8048-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
For more than 2,000 years, it was thought that malignant spirits caused diseases. By the end of nineteenth century, these beliefs were displaced by more modern concepts of disease, namely, the formulation of the “germ theory,” which asserted that bacteria or other microorganisms caused disease. With the emergence of chronic degenerative and of autoimmune diseases in the last century, the causative role of microorganisms has been intensely debated; however, no clear explanatory models have been achieved. In this review, we examine the current available literature regarding the relationships between infections and 16 autoimmune diseases. We critically analyzed clinical, serological, and molecular associations, and reviewed experimental models of induction of and, alternatively, protection from autoimmune diseases by infection. After reviewing several studies and reports, a clinical and experimental pattern emerges: Chronic and multiple infections with viruses, such as Epstein–Barr virus and cytomegalovirus, and bacteria, such as H. pylori, may, in susceptible individuals, play a role in the evolvement of autoimmune diseases. As the vast majority of infections pertain to our resident microbiota and endogenous retroviruses and healthy carriage of infections is the rule, we propose to focus on understanding the mechanisms of this healthy carrier state and what changes its configurations to infectious syndromes, to the restoration of health, or to the sustaining of illness into a chronic state and/or autoimmune disease. It seems that in the development of this healthy carriage state, the infection or colonization in early stages of ontogenesis with key microorganisms, also called ‘old friends’ (lactobacilli, bifidobacteria among others), are important for the healthy living and for the protection from infectious and autoimmune syndromes.
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Affiliation(s)
- V Pordeus
- Clinical Research, Pro Cardiaco Hospital Research Center-PROCEP, Rio de Janeiro, Brazil
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A response to “Association of an EAAT2 polymorphism with higher glutamate concentration in relapsing multiple sclerosis”. J Neuroimmunol 2008; 203:116-7. [DOI: 10.1016/j.jneuroim.2008.06.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2008] [Revised: 06/13/2008] [Accepted: 06/19/2008] [Indexed: 11/24/2022]
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Abstract
Multiple sclerosis is a common neurological disorder that represents a significant source of disability. B cells have recently emerged as a novel therapeutic target for multiple sclerosis. The natural development of B cells is characterized by an antigen-independent phase that occurs in the bone marrow and an antigen-dependent phase that takes place in the peripheral lymphoid tissue. The stage of B-cell development can be identified by the presence of specific cell surface markers. Checkpoints are in place to prevent self-reactive B cells from further development and activation. Some self-reactive B cells are able to escape these checkpoints, resulting in a loss of tolerance. B cells may contribute to systemic autoimmunity and the development of autoimmune disease via cytokine production, antigen presentation, and complement activation. In addition, B cells may trigger autoimmune disease via molecular mimicry, which occurs when a single B-cell receptor recognizes both a non-self antigen molecule and a self-molecule. Accumulating data suggest that ectopic proliferation of B cells in the central nervous system may also play a role. Further research is needed to elucidate the pathology of B cells and their role in central nervous system autoimmune diseases, including multiple sclerosis.
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Affiliation(s)
- Nancy L Monson
- University of Texas Southwestern Medical School, Dallas, Texas, USA.
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Westall FC. Abnormal hormonal control of gut hydrolytic enzymes causes autoimmune attack on the CNS by production of immune-mimic and adjuvant molecules: A comprehensive explanation for the induction of multiple sclerosis. Med Hypotheses 2006; 68:364-9. [PMID: 16978797 DOI: 10.1016/j.mehy.2006.06.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Revised: 06/28/2006] [Accepted: 06/30/2006] [Indexed: 11/24/2022]
Abstract
Multiple sclerosis (MS) is generally thought to be caused by an autoimmune attack on central nervous system (CNS) myelin. A microorganism containing a mimic of an immunogenic region of a myelin protein initiates the autoimmune process. However, no specific "MS" microorganism has been found. Recently a large number of normal human gut bacteria were found to possess different encephalitogenic mimics. A hypothesis is presented that the autoimmune process is started by abnormal proteolytic digestion of these bacteria. Sufficient quantities of the mimics are produced to be recognized by the immune system. Since proteolytic processes in the gut are strictly controlled, it is proposed that the MS process is triggered by abnormal hormonal control of gut proteolytic enzymes. It has previously been suggested that the recognition of CNS myelin antigens by activated MS immune cells is facilitated by proteolytic processing of myelin proteins. The CNS proteases are also under rigid control and these control processes are the same as is in the gut. Therefore, MS clinical activity is the result of improper hydrolytic degradation in the brain-gut axis caused by an abnormal hormonal variation.
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Affiliation(s)
- Fred C Westall
- Institute for Disease Research, PO Box 890193, Temecula, CA 92589-0193, USA.
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