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The Journal of Immunology, Vol 156, Issue 12 4932-4939, Copyright © 1996 by American Association of Immunologists
ARTICLES |
GJ Christianson, RL Blankenburg, TM Duffy, D Panka, JB Roths, A Marshak- Rothstein and DC Roopenian
The Jackson Laboratory, Bar Harbor, ME 04609, USA.
MRL-lpr/lpr mice develop a distinctive immunologic disease characterized by accumulation of unusually large numbers of T cells in the peripheral lymphoid organs. Most of the accumulating T cells express an alpha beta-TCR but are peculiar in that they express neither CD4 nor CD8 co-ligands. Concurrent with lymphoaccumulation of such double negative (DN) T cells, MRL-lpr/lpr mice develop a lethal systemic lupus erythematosus-like autoimmune syndrome. This study focuses on the role of MHC class I molecules in this latter pathologic process. Highly backcrossed class I molecule-deficient MRL and MRL-lpr mice carrying a functionally defective allele of the gene beta 2- microglobulin (B2m) were produced. Class I deficient MRL-lpr/lpr mice demonstrated a substantial reduction in DN T cells, confirming other reports indicating that most DN T cells arise from progenitors positively selected on MHC class I molecules. Significantly, class I- deficient MRL-lpr/lpr mice also demonstrated a diminution of every autoimmune disease indicator analyzed including hypergammaglobulinemia; autoantibodies including anti-DNA, anti-Smith antigen, and rheumatoid factor; and glomerulonephritis. The results indicate that class I- dependent T cells are crucial not only for the development of DN T cells, but for multiple features of the MRL-lpr/lpr systemic lupus erythematosus syndrome. Moreover, the pattern of hypergammaglobulinemia suggests that the requirement for MHC class I proteins is restricted temporally to later stages of the disease.
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