Type 1 diabetes (T1D) is a T cell-mediated autoimmune disease characterized by the destruction of insulin-producing β cells in the pancreatic islets. The migration of T cells from blood vessels into pancreas is critical for the development of islet inflammation and β cell destruction in T1D. To define the roles of C-C chemokine receptor type 7 (CCR7) in recruitment of T cells into islets, we used laser capture microdissection to isolate tissue from inflamed islets of nonobese diabetic (NOD) mice and uninflamed islets of BALB/c and young NOD mice. RT-PCR analyses detected mRNAs for CCR7 and its chemokine ligands CCL19 (ELC; MIP-3β) and CCL21 (SLC) in captures from inflamed, but not from uninflamed, islets. Immunohistology studies revealed that high endothelial venules in inflamed islets co-express CCL21 protein and MAdCAM-1 (an adhesion molecule that recruits lymphocytes into islets). Desensitization of lymphocyte CCR7 blocked about 75 % of T cell migration from the bloodstream into inflamed islets, but had no effect on B cell migration into islets. These results indicate that CCR7 and its ligands are important in the recruitment of T cells into inflamed islets and thus in the pathogenesis of T1D.
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