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      The role of microbiome in rheumatoid arthritis treatment

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          Abstract

          Rheumatoid arthritis (RA) is an autoimmune disorder with multifactorial etiology; both genetic and environmental factors are known to be involved in pathogenesis. Treatment with disease-modifying antirheumatic drugs (DMARDs) plays an essential role in controlling disease progression and symptoms. DMARDs have immunomodulatory properties and suppress immune response by interfering in various pro-inflammatory pathways. Recent evidence has shown that the gut microbiota directly and indirectly modulates the host immune system. RA has been associated with dysbiosis of the gut microbiota. Patients with RA treated with DMARDs show partial restoration of eubiotic gut microbiome. Hence, it is essential to understand the impact of DMARDs on the microbial composition and its consequent influences on the host immune system to identify novel therapies for RA. In this review, we discuss the importance of antirheumatic-drug-induced host microbiota modulations and possible probiotics that can generate eubiosis.

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          Recognition of commensal microflora by toll-like receptors is required for intestinal homeostasis.

          Toll-like receptors (TLRs) play a crucial role in host defense against microbial infection. The microbial ligands recognized by TLRs are not unique to pathogens, however, and are produced by both pathogenic and commensal microorganisms. It is thought that an inflammatory response to commensal bacteria is avoided due to sequestration of microflora by surface epithelia. Here, we show that commensal bacteria are recognized by TLRs under normal steady-state conditions, and this interaction plays a crucial role in the maintenance of intestinal epithelial homeostasis. Furthermore, we find that activation of TLRs by commensal microflora is critical for the protection against gut injury and associated mortality. These findings reveal a novel function of TLRs-control of intestinal epithelial homeostasis and protection from injury-and provide a new perspective on the evolution of host-microbial interactions.
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            An immunomodulatory molecule of symbiotic bacteria directs maturation of the host immune system.

            The mammalian gastrointestinal tract harbors a complex ecosystem consisting of countless bacteria in homeostasis with the host immune system. Shaped by evolution, this partnership has potential for symbiotic benefit. However, the identities of bacterial molecules mediating symbiosis remain undefined. Here we show that, during colonization of animals with the ubiquitous gut microorganism Bacteroides fragilis, a bacterial polysaccharide (PSA) directs the cellular and physical maturation of the developing immune system. Comparison with germ-free animals reveals that the immunomodulatory activities of PSA during B. fragilis colonization include correcting systemic T cell deficiencies and T(H)1/T(H)2 imbalances and directing lymphoid organogenesis. A PSA mutant of B. fragilis does not restore these immunologic functions. PSA presented by intestinal dendritic cells activates CD4+ T cells and elicits appropriate cytokine production. These findings provide a molecular basis for host-bacterial symbiosis and reveal the archetypal molecule of commensal bacteria that mediates development of the host immune system.
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              Gut-residing segmented filamentous bacteria drive autoimmune arthritis via T helper 17 cells.

              Commensal microbes can have a substantial impact on autoimmune disorders, but the underlying molecular and cellular mechanisms remain largely unexplored. We report that autoimmune arthritis was strongly attenuated in the K/BxN mouse model under germ-free (GF) conditions, accompanied by reductions in serum autoantibody titers, splenic autoantibody-secreting cells, germinal centers, and the splenic T helper 17 (Th17) cell population. Neutralization of interleukin-17 prevented arthritis development in specific-pathogen-free K/BxN mice resulting from a direct effect of this cytokine on B cells to inhibit germinal center formation. The systemic deficiencies of the GF animals reflected a loss of Th17 cells from the small intestinal lamina propria. Introduction of a single gut-residing species, segmented filamentous bacteria, into GF animals reinstated the lamina propria Th17 cell compartment and production of autoantibodies, and arthritis rapidly ensued. Thus, a single commensal microbe, via its ability to promote a specific Th cell subset, can drive an autoimmune disease. Copyright 2010 Elsevier Inc. All rights reserved.
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                Author and article information

                Contributors
                Journal
                Ther Adv Musculoskelet Dis
                Ther Adv Musculoskelet Dis
                TAB
                sptab
                Therapeutic Advances in Musculoskeletal Disease
                SAGE Publications (Sage UK: London, England )
                1759-720X
                1759-7218
                30 July 2019
                2019
                : 11
                : 1759720X19844632
                Affiliations
                [1-1759720X19844632]Department of Immunology, Mayo Clinic, Rochester, MN, USA
                [2-1759720X19844632]Department of Immunology, Mayo Clinic, Rochester, MN, USA
                [3-1759720X19844632]Department of Immunology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
                Author notes
                Author information
                https://orcid.org/0000-0003-2401-694X
                Article
                10.1177_1759720X19844632
                10.1177/1759720X19844632
                6685117
                31431810
                d5c842f0-b865-408a-9c84-208553222c66
                © The Author(s), 2019

                This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License ( http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages ( https://us.sagepub.com/en-us/nam/open-access-at-sage).

                History
                : 1 February 2019
                : 25 March 2019
                Funding
                Funded by: U.S. Department of Defense, FundRef https://doi.org/10.13039/100000005;
                Award ID: W81XWH-15-1-0213
                Funded by: mayo foundation for medical education and research, FundRef https://doi.org/10.13039/100007048;
                Categories
                Review
                Custom metadata
                January-December 2019

                disease-modifying antirheumatic drugs,gut microbiota,immune modulation,microbial modulation,probiotics,rheumatoid arthritis

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