Gut dysbiosis breaks immunological tolerance toward the central nervous system during young adulthood

Sudhir K. Yadav, Sridhar Boppana, Naoko Ito, John E. Mindur, Martin T. Mathay, Ankoor Patel, Suhayl Dhib-Jalbut, Kouichi Ito

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Multiple sclerosis (MS) is an autoimmune disease targeting the central nervous system (CNS) mainly in young adults, and a breakage of immune tolerance to CNS self-antigens has been suggested to initiate CNS autoimmunity. Age and microbial infection are well-known factors involved in the development of autoimmune diseases, including MS. Recent studies have suggested that alterations in the gut microbiota, referred to as dysbiosis, are associated with MS. However, it is still largely unknown how gut dysbiosis affects the onset and progression of CNS autoimmunity. In this study, we investigated the effects of age and gut dysbiosis on the development of CNS autoimmunity in humanized transgenic mice expressing the MS-associated MHC class II (MHC-II) gene, HLA-DR2a, and T-cell receptor (TCR) genes specific for MBP87-99/DR2a that were derived from an MS patient. We show here that the induction of gut dysbiosis triggers the development of spontaneous experimental autoimmune encephalomyelitis (EAE) during adolescence and early young adulthood, while an increase in immunological tolerance with aging suppresses disease onset after late young adulthood in mice. Furthermore, gut dysbiosis induces the expression of complement C3 and production of the anaphylatoxin C3a, and down-regulates the expression of the Foxp3 gene and anergy-related E3 ubiquitin ligase genes. Consequently, gut dysbiosis was able to trigger the development of encephalitogenic T cells and promote the induction of EAE during the age window of young adulthood.

Original languageEnglish (US)
Pages (from-to)E9318-E9327
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number44
DOIs
StatePublished - Oct 31 2017

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • Aging
  • Complement
  • Dysbiosis
  • Immune tolerance
  • Multiple sclerosis

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