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A tight control of endoplasmic reticulum homeostasis is crucial for beta cell function and survival. We recently described that IL-1beta plus IFN-gamma deplete endoplasmic reticulum Ca2+ stores in beta cells, leading to endoplasmic reticulum stress and apoptosis. IL-1beta alone induced endoplasmic reticulum stress but failed to induce beta cell death, while IFN-gamma alone neither caused endoplasmic reticulum stress nor induced beta cell death. This suggests that IFN-gamma aggravates endoplasmic reticulum stress induced by IL-1beta, eventually triggering apoptosis. Here we tested this hypothesis and the mechanisms involved, by investigating the effects of IFN-gamma on endoplasmic reticulum-stress-induced beta cell apoptosis caused by a specific blocker of the sarcoendoplasmic-reticulum pump Ca2+-ATPase (SERCA).

Interferon-γ potentiates endoplasmic reticulum stress-induced death by reducing pancreatic beta cell defence mechanisms