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Protein kinase R-like endoplasmic reticulum kinase and glycogen synthase kinase-3?/? regulate foam cell formation S #MMPMID25183803
McAlpine CS; Werstuck GH
J Lipid Res 2014[Nov]; 55 (11): 2320-33 PMID25183803show ga
Evidence suggests a causative role for endoplasmic reticulum (ER) stress in the development of atherosclerosis. This study investigated the potential role of glycogen synthase kinase (GSK)-3?/? in proatherogenic ER stress signaling. Thp1-derived macrophages were treated with the ER stress-inducing agents, glucosamine, thapsigargin, or palmitate. Using small-molecule inhibitors of specific unfolded protein response (UPR) signaling pathways, we found that protein kinase R-like ER kinase (PERK), but not inositol requiring enzyme 1 or activating transcription factor 6, is required for the activation of GSK3?/? by ER stress. GSK3?/? inhibition or siRNA-directed knockdown attenuated ER stress-induced expression of distal components of the PERK pathway. Macrophage foam cells within atherosclerotic plaques and isolated macrophages from ApoE?/? mice fed a diet supplemented with the GSK3?/? inhibitor valproate had reduced levels of C/EBP homologous protein (CHOP). GSK3?/? inhibition blocked ER stress-induced lipid accumulation and the upregulation of genes associated with lipid metabolism. In primary mouse macrophages, PERK inhibition blocked ER stress-induced lipid accumulation, whereas constitutively active S9A-GSK3? promoted foam cell formation and CHOP expression, even in cells treated with a PERK inhibitor. These findings suggest that ER stress-PERK-GSK3?/? signaling promotes proatherogenic macrophage lipid accumulation.