Tolerance to islet antigens and prevention from diabetes induced by limited apoptosis of pancreatic beta cells - PubMed (original) (raw)
Tolerance to islet antigens and prevention from diabetes induced by limited apoptosis of pancreatic beta cells
Stéphanie Hugues et al. Immunity. 2002 Feb.
Free article
Abstract
Crosspresentation of self-antigens by antigen-presenting cells is critical for the induction of peripheral tolerance. As apoptosis facilitates the entry of antigens into the crosspresentation pathway, we sought to prevent the development of autoimmune diabetes by inducing pancreatic beta cell apoptosis before disease onset. Accordingly, young nonobese diabetic (NOD) mice injected with a single low dose of streptozotocin (SZ), a drug cytotoxic for beta cells, exhibited impaired T cell responses to islet antigens and were protected from spontaneous diabetes. Furthermore, beta cell apoptosis was necessary for protection since SZ did not protect RIP-CrmA transgenic NOD mice in which beta cells expressed the caspase inhibitor CrmA. Our results support a model in which apoptosis of pancreatic beta cells induces the development of regulatory cells leading to the tolerization of self-reactive T cells and protection from diabetes.
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