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• W2793073430 abstract "Lipids are responsible for the atheromatous plaque formation during atherosclerosis by their deposition in the subendothelial intima of the aorta, leading to infarction. Sterol regulatory element-binding protein 2 (SREBP2), regulating cholesterol homeostasis, is suggested to play a pivotal role during the early incidence of atherosclerosis through dysregulation of lipid homeostasis. Here we demonstrate that oxidative stress stimulates SREBP2-mediated cholesterol uptake via low density lipoprotein receptor (LDLR), rather than cholesterol synthesis, in mouse vascular aortic smooth muscle cells (MOVAS) and THP-1 monocytes. The enhancement of mature form of SREBP2 (SREBP2-M) during oxidative stress was associated with the inhibition of AMP-activated protein kinase (AMPK) activation. In contrast, inhibition of either SREBP2 by fatostatin or LDLR by siLDLR resulted in decreased cholesterol levels during oxidative stress. Thereby confirming the role of SREBP2 in cholesterol regulation via LDLR. Metformin-mediated activation of AMPK was able to significantly abrogate cholesterol uptake by inhibiting SREBP2-M. Interestingly, although metformin administration attenuated angiotensin (Ang)-II-impaired lipid homeostasis in both aorta and liver tissues of ApoE-/- mice, the results indicate that SREBP2 through LDLR regulates lipid homeostasis in aorta but not in liver tissue. Taken together, AMPK activation inhibits oxidative stress-mediated SREBP2-dependent cholesterol uptake, and moreover, metformin-induced prevention of atheromatic events are in part due to its ability to regulate the SREBP2-LDLR axis." @default.
• W2793073430 created "2018-03-29" @default.
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• W2793073430 date "2018-04-01" @default.
• W2793073430 modified "2023-09-24" @default.
• W2793073430 title "Metformin treatment prevents SREBP2-mediated cholesterol uptake and improves lipid homeostasis during oxidative stress-induced atherosclerosis" @default.
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• W2793073430 doi "https://doi.org/10.1016/j.freeradbiomed.2018.02.031" @default.
• W2793073430 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29499335" @default.
• W2793073430 hasPublicationYear "2018" @default.
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