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Characterization of anti-single-stranded DNA B cells in a non-autoimmune background.

K. Nguyen,L. Mandik,A. Bui,J. Kavaler,A. Norvell,J. Monroe,J. Roark,J. Erikson

Published 1997 in Journal of Immunology

ABSTRACT

Anti-DNA Abs are prevalent in the serum of systemic lupus erythematosus (SLE) patients and in the MRL-lpr/lpr mouse model of SLE, but are generally absent in normal individuals. We have studied the regulation of anti-ssDNA B cells in a non-autoimmune (BALB/c) background by using Ig transgenes (Tgs) encoding anti-DNA Abs. In one case, they are present with other non-DNA-binding B cells (the VH3H9 Tg with endogenous light chains); in the other, they are present as an essentially monospecific population (VH3H9/Vkappa8). We have previously observed that serum anti-ssDNA levels in these Tg mice were no higher than those of non-Tg mice, despite the fact that anti-ssDNA B cells dominate the peripheral B cell repertoire. These results suggested that the anti-ssDNA Tg B cells present are functionally inactivated. In this paper, we isolate B cells from VH3H9/Vkappa8 Tg mice to show that this is indeed the case and go on to further define this state. We demonstrate that VH3H9/Vkappa8 Tg B cells have diminished Ig secretion in response to both T-independent and T-dependent stimuli compared with non-Tg controls. VH3H9/Vkappa8 Tg B cells also show suboptimal proliferation in response to anti-IgM F(ab)'2 fragments and LPS, and are phenotypically distinct in expressing decreased total surface Ig. Despite their functional defects, however, VH3H9/Vkappa8 Tg B cells have an in vivo turnover rate comparable to non-Tg B cells, suggesting that they are long lived.

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