The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 181, 1157-1167, Copyright © 1995 by Rockefeller University Press


ARTICLES

Breakdown of B cell tolerance in a mouse model of systemic lupus erythematosus

JH Roark, CL Kuntz, KA Nguyen, AJ Caton and J Erikson
Wistar Institute, Philadelphia, Pennsylvania 19104.

Anti-DNA antibodies, specifically those that stain nuclei in a homogenous nuclear (HN) fashion, are diagnostic of systemic lupus erythematosus (SLE) and the MRL-lpr/lpr SLE murine model. We have used a heavy chain transgene that increases the frequency of anti-HN antibodies to address whether their production in SLE is the consequence of a defect in B cell tolerance. Anti-HN B cells were undetectable in nonautoimmune-prone transgenic mice, but in MRL-lpr/lpr transgenic mice their Ig was evident in the sera and they were readily retrievable as hybridomas. We conclude that nonautoimmune animals actively delete anti-HN-specific B cells, and that MRL-lpr/lpr mice are defective in this process possibly because of the lpr defect in the fas gene.
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