B cell selection and allelic exclusion of an anti-DNA Ig transgene in MRL-lpr/lpr mice - PubMed (original) (raw)

. 1995 May 1;154(9):4444-55.

Affiliations

B cell selection and allelic exclusion of an anti-DNA Ig transgene in MRL-lpr/lpr mice

J H Roark et al. J Immunol. 1995.

Abstract

We have used an Ig transgene (VH3H9) that increases the frequency of anti-DNA autoantibodies to address whether the production of antinuclear Abs in systemic lupus erythematosus is the consequence of a breakdown of B cell tolerance. We have shown that nonautoimmune mice regulate anti-DNA B cells, and that lupus-prone MRL-lpr/lpr mice are defective in this regulation. Here we show that a subset of anti-DNA B cells, namely those that stain nuclei in a homogeneous fashion, not only fail to be deleted in MRL-lpr/lpr mice, but undergo preferential clonal expansion. In addition, we describe a surprising finding: the VH3H9 transgene is less efficient at inhibiting endogenous heavy chain gene rearrangement on the autoimmune-prone MRL-lpr/lpr genetic background than on the nonautoimmune BALB/c background.

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