ArticleThe Journal of clinical investigation2026
Diabetic and ER-stressed pancreatic islet β cells are in need of some JNK removal.
Article in The Journal of clinical investigation, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pancreatic β cells regulate glucose homeostasis through insulin secretion, but nutrient overload and genetic defects can trigger ER stress and apoptosis, contributing to type 2 diabetes. Within β cells, the kinases PERK, IRE1α, and ATF6 initiate the unfolded protein response (UPR) as a result of ER stress, a process that is constitutively suppressed under nonstress conditions by GRP78 binding to these proteins. To gain insight into the mechanisms of β cell death upon dysregulated ER stress, Sharma et al. used β cell-specific GRP78 knockout models, revealing that hyperactivation of the UPR promoted β cell death primarily through the IRE1α/JNK/p53 signaling pathway. Pharmacological inhibition of JNK improved β cell survival, increased insulin levels, and lowered blood glucose in multiple diabetic mouse models. These findings highlight JNK signaling as a promising therapeutic target for preserving β cell function.
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