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Immunoproteasome Activation During Early Antiviral Response in Mouse Pancreatic β-cells: New Insights into Auto-antigen Generation in Type I Diabetes?
Author(s): Wieke Freudenburg, Madhav Gautam, Pradipta Chakraborty, Jared James, Jennifer Richards, Alison S Salvatori, Aaron Baldwin, Jill Schriewer, R Mark L Buller, John A Corbett and Dorota SkowyraWieke Freudenburg, Madhav Gautam, Pradipta Chakraborty, Jared James, Jennifer Richards, Alison S Salvatori, Aaron Baldwin, Jill Schriewer, R Mark L Buller, John A Corbett and Dorota Skowyra
Type 1 diabetes results from autoimmune destruction of the insulin producing pancreatic β-cells. The immunoproteasome, a version of the proteasome that collaborates with the 11S/PA28 activator to generate immunogenic peptides for presentation by MHC class I molecules, has long been implicated in the onset of the disease, but little is known about immunoproteasome function and regulation in pancreatic β-cells. Interesting insight into these issues comes from a recent analysis of the immunoproteasome expressed in pancreatic β-cells during early antiviral defenses mediated by interferon β (IFNβ), a type I IFN implicated in the induction of the diabetic state in human and animal models. Using mouse islets and the MIN6 insulinoma cell line, Freudenburg et al. found that IFNβ stimulates expression of the immunoproteasome and the 11S/PA28 activator in a manner f.. View More»