| First Author | Kakkanaiah VN | Year | 1997 |
| Journal | J Immunol | Volume | 159 |
| Issue | 2 | Pages | 1027-35 |
| PubMed ID | 9218626 | Mgi Jnum | J:42203 |
| Mgi Id | MGI:1095297 | Doi | 10.4049/jimmunol.159.2.1027 |
| Citation | Kakkanaiah VN, et al. (1997) B cell genotype determines the fine specificity of autoantibody in lpr mice. J Immunol 159(2):1027-35 |
| abstractText | Anti-Sm Abs are specific markers of human systemic lupus erythematosus (SLE) and of murine models of this disease. In humans, anti-Sm Abs are mostly IgG1, and in MRL/lpr mice, IgG2a; both are T-dependent isotypes, Other lpr strains, such as B6/lpr, do not produce anti-Sm Ab spontaneously. The present study was aimed at identifying the cellular expression of background genes responsible for generation of the anti-Sm Ab response in MRL/lpr mice. We used double chimeric mice made by transferring MRL/lpr and B6/lpr bone marrows into irradiated allotype heterozygous F, mice, Five mo after reconstitution, FAGS analysis of lymph node (LN) and spleen cells revealed that both MRL/lpr and B6/lpr cells coexisted in roughly equal numbers. Ab produced by each donor could be distinguished by allotype-specific assays. IgG2a anti-Sm was made only by MRL-derived B cells despite the presence of T cells that might potentially provide help to the B6/lpr B cells. The frequency of anti-Sm Ab-producing individuals was similar to that of unmanipulated MRL/lpr mice (about 25%). IgG2a anti-chromatin and total Igc2a was mostly dominated by the MRL-derived B cells. BG-derived B cells produced more rheumatoid factor (RF) against their own IgG2b(b), while RF against IgG2a was dominated by MRL-derived B cells, This suggests that the control of the production of particular autoantibody specificities, such as anti-Sm, is determined by the expression of MRL or B6 background genes in B cells. |
