Abstract
Type 1 diabetes (T1D) results from autoimmune destruction of the insulin-producing beta-cells in the pancreatic islets of Langerhans by autoreactive T helper 1 (Th1) cells characterized by their cytokine secretory products, interleukin-2 (IL-2) and interferon gamma (IFNgamma). Th1-type cytokines (IL-2 and IFNgamma) correlate with T1D, whereas Th2 (IL-4 and IL-10), Th3 (transforming growth factor beta [TGFbeta]), and T regulatory cell-type cytokines (IL-10 and TGFbeta) correlate with protection from T1D. Paradoxically, however, administrations of Th1-type cytokines (IL-2 and IFNgamma) and immunotherapies that induce Th1-type cytokine responses actually prevent T1D, at least in animal models. Therefore, immunotherapies that inhibit IL-2 production/action will block Th1 cell/cytokine-driven effector mechanisms of pancreatic islet beta-cell destruction; however, anti-IL-2 therapy will not allow immune tolerance to be established. In contrast, immunotherapies that increase IL-2 production/action may correct an immunodeficiency in IL-2 production that appears to underlie the autoimmunity of T1D, thereby restoring immune tolerance to islet beta-cells and prevention of T1D.
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