Abstract
Distinct features of the pancreas of fulminant type 1 diabetes (FT1DM) include (1) enterovirus infection of the islets and exocrine acinar tissue. (2) Activated innate immune responses: MDA5 and RIG-I expression and TLR4 and TLR9 expression in the islets of FT1DM. (3) Combined activation of the STAT/JNK and NFkB pathways, resulting in Type I interferon (IFN) and proinflammatory cytokine (i.e., IFNγ) expression in islet beta cells and MHC class I hyper-expression. (4) Activation of dendritic cells followed by effector cell infiltration of CD8+ T cells and CD68+ macrophages, resulting in apoptosis and neurosis of islet cells and exocrine acinar cells. (5) Many chemo-attractants (i.e., CXCL10) and chemotactic activators (i.e., l-plastin) were induced by a viral infection. (6) Mutual stimulating effect of cytokines expressed in beta cells in autocrine and paracrine mechanisms may enhance beta-cell destruction through the STA1-caspase pathway. (7) Proteomics analysis using laser capture microdissection followed by mass spectrometry found 38 molecules in inflamed islets of FT1DM, which were not highlighted before. Our pathologically verified model of beta-cell destruction in FT1DM will contribute to anti-virus therapy of type 1 diabetes in the near future.
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