Experimental induction of systemic lupus erythematosus by recognition of foreign Ia

A chronic GVH reaction induced in normal mice results in a syndrome that closely resembles SLE. In this study, we compared the autoimmune GVH syndrome induced in parent ( C57BL 6Kh [B6] and B6.C-H-2 bm12 [bm12]) and F 1 ([B6 × bm12]F 1) mice by transfer of parental spleen cells. A majority of the mice in all groups developed autoantibodies to chromatin and erythrocytes, and some of the mice also produced anti-dsDNA antibodies. The predominant isotype of the anti-chromatin autoantibodies was found to be IgG2a, although high levels of IgG2b antibodies were also present. Autoantibody production was in general more intense and more prevalent in parent → F 1 hybrid combinations, compared to parent → parent infusions. No influence of host or graft gender was observed. These studies show that a chronic GVH reaction can be induced by both parent → parent and parent → hybrid combinations.