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L Is a Partial Agonist for Outer Surface Protein A-Reactive T Cells1



*
Laboratory of Molecular Immunology, Center for Neurologic Diseases, Brigham and Womens Hospital and Harvard Medical School, Boston, MA 02115;
Department of Pathology, and
Division of Rheumatology/Immunology, Tufts University School of Medicine, New England Medical Center, Boston, MA 02111
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-1
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-1
L, we
used OspA-specific T cell hybrids from DR4 transgenic mice, as well as
cloned human cells specific for OspA165184, the
immunodominant epitope, from five DRB1*0401+ patients,
using OspA-MHC class II tetramers. Although OspA165184
stimulated nearly all OspA-specific human T cell clones tested to
proliferate and secrete IFN-
and IL-13,
LFA-1
L326345 stimulated
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-1
L326345
behaves as a partial agonist, perhaps playing a role in perpetuating
symptoms of arthritis.
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