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The Journal of Immunology, Vol 143, Issue 7 2176-2178, Copyright © 1989 by American Association of Immunologists

ARTICLES

Characterization of primary T cell subsets mediating rejection of pancreatic islet grafts

RG Gill, AS Rosenberg, KJ Lafferty and A Singer
Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center, Denver 80262.

The cellular mechanisms by which pancreatic islet grafts are rejected have not been clearly defined. In order to address the roles of CD4+ and CD8+ T cells in pancreatic islet rejection, we used an adoptive transfer model in which H-2b nude mice were reconstituted with negatively selected H-2b CD4+ or CD8+ T cell subpopulations and engrafted with fully allogeneic pancreatic islet grafts. We found that primary (unprimed) CD4+ T cells mediated the rejection of pancreatic islet grafts, whereas, primary CD8+ T cells failed to do so, even though both T cell subpopulations were competent to reject skin allografts. These data indicate that primary CD4+ T cells are necessary for rejection of allogeneic pancreatic islet grafts, whereas primary CD8+ T lymphocytes are not. Implications concerning the nature of the APC involved in the initiation of the rejection response to islet allografts and the expression of MHC Ag by pancreatic islet cells are discussed.


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