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Diabetes, Vol 37, Issue 5 520-525, Copyright © 1988 by American Diabetes Association

ARTICLES

Role of host immune system in BB/Wor rat. Predisposition to diabetes resides in bone marrow

K Nakano, JP Mordes, ES Handler, DL Greiner and AA Rossini
Diabetes Division, University of Massachusetts Medical Center, Worcester 01655.

The role of the immune system in the development of autoimmune diabetes mellitus in the BB/Wor rat was studied with bone marrow transplantation methodology. In the first experiment, diabetes-prone (DP) and diabetes-resistant (DR) BB/Wor rats were irradiated and reconstituted with bone marrow to create both reciprocal (DP donor----DR host; DR donor----DP host) and syngeneic (DR----DR; DP----DP) histocompatible chimeras. Both susceptibility and resistance to subsequent spontaneous diabetes in these chimeras were found to be a function of the type of donor bone marrow transplanted and not the genetic background of the host. In a second experiment, rats from three strains that share the RT1u major histocompatibility complex haplotype of the BB/Wor and rats from three non-RT1u strains were lethally irradiated and reconstituted with DP BB/Wor bone marrow. To rapidly induce diabetes and/or insulitis, they were then injected with mitogen-activated spleen cells from acutely diabetic DP BB/Wor donors, with standard passive-transfer methods. Diabetes and pancreatic insulitis were observed in RT1u recipients, whereas non-RT1u rats developed insulitis but not diabetes. The data suggest that predisposition to spontaneous diabetes in BB rats resides in bone marrow cells.
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Copyright © 1988 by the American Diabetes Association.