Abstract
One hypothesis that couples infection with autoimmune disease is molecular mimicry. Molecular mimicry is characterized by an immune response to an environmental agent that cross-reacts with a host antigen, resulting in disease1,2. This hypothesis has been implicated in the pathogenesis of diabetes, lupus and multiple sclerosis (MS)1,2,3,4. There is limited direct evidence linking causative agents with pathogenic immune reactions in these diseases. Our study establishes a clear link between viral infection, autoimmunity and neurological disease in humans. As a model for molecular mimicry, we studied patients with human T-lymphotropic virus type 1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP), a disease that can be indistinguishable from MS (refs. 5,6,7). HAM/TSP patients develop antibodies to neurons8. We hypothesized these antibodies would identify a central nervous system (CNS) autoantigen. Immunoglobulin G isolated from HAM/TSP patients identified heterogeneous nuclear ribonuclear protein-A1 (hnRNP-A1) as the autoantigen. Antibodies to hnRNP-A1 cross-reacted with HTLV-1-tax, the immune response to which is associated with HAM/TSP (refs. 5,9). Immunoglobulin G specifically stained human Betz cells, whose axons are preferentially damaged7. Infusion of autoantibodies in brain sections inhibited neuronal firing, indicative of their pathogenic nature. These data demonstrate the importance of molecular mimicry between an infecting agent and hnRNP-A1 in autoimmune disease of the CNS.
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Acknowledgements
We thank K. Troughton, E. Umstot and J. Berk for technical assistance; C. Raine for autopsy material; S. Jacobson for some of the serum samples; and B. Langton for the HTLV-1-tax monoclonal antibody obtained through the AIDS Research and Reference Reagent Program, Division of AIDS, NIAID, NIH. This material is based upon work supported by the Office of Research and Development, Medical Research Service, Department of Veterans Affairs. This study was funded by the VA Career Development Award and NIH RO1-NS-38876 (to M.C.L.), and NIH RR 10522 and NSF-DBI-9604633 (to D.M.D.).
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Levin, M., Lee, S., Kalume, F. et al. Autoimmunity due to molecular mimicry as a cause of neurological disease. Nat Med 8, 509–513 (2002). https://doi.org/10.1038/nm0502-509
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DOI: https://doi.org/10.1038/nm0502-509
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