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Molecular mimicry in Lyme arthritis demonstrated at the single cell level: LFA-1 alpha L is a partial agonist for outer surface protein A-reactive T cells.

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By Trollmo C, Meyer AL, Steere AC, Hafler DA, Huber BT • www.ProHealth.com • April 15, 2001


Abstract

Antibiotic treatment-resistant Lyme arthritis is a chronic inflammatory joint disease that follows infection with Borrelia burgdorferi (BB:). A marked Ab and T cell response to BB: outer surface protein A (OspA) often develops during prolonged episodes of arthritis. Furthermore, cross-reaction between the bacterial OspA and human LFA-1alpha(L) at the T cell level and the inability to detect BB: in the joint implicate an autoimmune mechanism. To analyze the nature of response to OspA and LFA-1alpha(L), we used OspA-specific T cell hybrids from DR4 transgenic mice, as well as cloned human cells specific for OspA(165-184), the immunodominant epitope, from five DRB1*0401(+) patients, using OspA-MHC class II tetramers. Although OspA(165-184) stimulated nearly all OspA-specific human T cell clones tested to proliferate and secrete IFN-gamma and IL-13, LFA-1alpha(L326-345) stimulated approximately 10% of these clones to proliferate and a greater percentage to secrete IL-13. Assays with LFA- or OspA-DR4 monomers revealed that higher concentrations of LFA-DR4 were needed to stimulate dual-reactive T cell hybrids. Our analysis at the clonal level demonstrates that human LFA-1alpha(L326-345) behaves as a partial agonist, perhaps playing a role in perpetuating symptoms of arthritis.

J Immunol. 2001 Apr 15;166(8):5286-91. Comparative Study; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.





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