Journal
CELL HOST & MICROBE
Volume 26, Issue 1, Pages 100-+Publisher
CELL PRESS
DOI: 10.1016/j.chom.2019.05.003
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Funding
- National Institutes of Health (NIH) [K08AI095318, R01AI118855, T32AI07019, T32DK007017-39]
- Yale Rheumatic Diseases Research Core [NIH P30 AR053495]
- Women's Health Research at Yale
- O'Brien Center at Yale [NIH P30DK079310]
- Arthritis National Research Foundation
- Arthritis Foundation
- Lupus Research Alliance
- American Heart Association [15GRNT24480140]
- Lupus Research Institute
- National Cancer Institute, National Institutes of Health [HHSN261200800001E]
- Intramural Research Program of the NIH, National Cancer Institute, Center for Cancer Research
- NATIONAL CANCER INSTITUTE [ZIABC010440] Funding Source: NIH RePORTER
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Given the immense antigenic load present in the microbiome, we hypothesized that microbiota mimotopes can be a persistent trigger in human autoimmunity via cross-reactivity. Using antiphospholipid syndrome (APS) as a model, we demonstrate cross-reactivity between non-orthologous mimotopes expressed by a common human gut commensal, Roseburia intestinalis (R. int), and T and B cell autoepitopes in the APS autoantigen beta(2)-glycoprotein I (beta(2)GPI). Autoantigen-reactive CD4(+) memory T cell clones and an APS-derived, pathogenic monoclonal antibody cross-reacted with R. int mimotopes. Core-sequence-dependent anti-R. int mimotope IgG titers were significantly elevated in APS patients and correlated with anti-beta(2)GPI IgG autoantibodies. R. int immunization of mice induced beta(2)GPI-specific lymphocytes and autoantibodies. Oral gavage of susceptible mice with R. int induced anti-human beta(2)GPI autoantibodies and autoimmune pathologies. Together, these data support a role for non-orthologous commensal-host cross-reactivity in the development and persistence of autoimmunity in APS, which may apply more broadly to human autoimmune disease.
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