Analysis of central B cell tolerance in autoimmune-prone MRL/lpr mice bearing autoantibody transgenes - PubMed (original) (raw)
. 1996 Jul 1;157(1):65-71.
Affiliations
- PMID: 8683157
Analysis of central B cell tolerance in autoimmune-prone MRL/lpr mice bearing autoantibody transgenes
C F Rubio et al. J Immunol. 1996.
Abstract
The effect of the autoimmune prone MRL/lpr (H-2k) genetic background on central B cell tolerance was studied in mice bearing 3-83 (anti-H-2Kk) Ig heavy and light chain transgenes. B cells bearing the dominant, transgene-encoded anti-H-2Kk specificity were tolerized appropriately on the MRL/lpr genetic background. Nevertheless, mice developed disease traits characteristic of the MRL/lpr strain, including lymphadenopathy and elevated levels of IgG dsDNA autoantibodies. Two transgenic lines were examined in this analysis: 3-83 mu delta, which expresses IgM and IgD forms of the 3-83 Ab, and Tol 1, which expresses only the IgM form of 3-83. The results obtained differed somewhat between the two transgenic lines. Crosses using 3-83 mu(delta) mice never demonstrated any defects in B cell self-tolerance to H-2Kk. Similarly, no Kk autoantibody production was seen in Tol 1 mice that were backcrossed onto the MRL/lpr genetic background and maintained in a specific pathogen-free facility. However, a subset of Tol 1/MRL/lpr mice that were housed in a conventional mouse facility demonstrated significant transgene-derived anti-Kk autoantibodies. Overall, these results suggest that there is no general defect in central B cell tolerance in MRL/lpr mice, despite their defect in the fas gene. These findings suggest similarities between the MRL/lpr T and B cell systems, because both fail to manifest clear central tolerance defects, but they nevertheless promote hyperplasia and autoimmunity in the peripheral immune system.
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