The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 167, 1137-1153, Copyright © 1988 by Rockefeller University Press

ARTICLES

Specificities and V genes encoding monoclonal autoantibodies from viable motheaten mice

CJ Painter, M Monestier, A Chew, A Bona-Dimitriu, K Kasturi, C Bailey, VE Scott, CL Sidman and CA Bona
Department of Microbiology, Mount Sinai School of Medicine, New York, New York 10029.

Several hundred hybridomas were obtained from 1-2-mo-old viable motheaten (mev) mice. Among the Ig-secreting hybridomas tested, greater than 50% (17/33) exhibited reactivity for autoantigens, supporting the idea that the Ly-1 B cells that predominate in mev mice contain frequent precursors of autoantibody-forming cells. Certain of the specificities of these autoantibodies correlated with the documented pathophysiology of mev mice (antithymocyte, -erythrocyte, -skin, - kidney, and -IgG); others were specific for autoantigens not previously observed in motheaten mice but though to be involved in other autoimmune diseases (e.g., intrinsic factor, transferrin, myelin basic protein, and thyroglobulin). About 2 of 3 (11/17) of the self-reactive antibodies exhibited multispecific binding activity for various autoantigens. Analysis by Northern blotting of the V gene families used in mev autoantibodies showed a random usage of VH families and a biased usage of four Vk gene families. Of 16 autoantibodies tested, 12 used a Vk gene from the Vk1, 4, 10, or 19 families. These patterns of Vk gene usage differ from nonautoimmune control animals. Overall, an immunoregulatory defect operating at a more generalized level than the VH or Vk loci, and due to a single gene mutation, appears to be responsible for the multiple immune abnormalities of mev mice.
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