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• W1973019932 endingPage "1810" @default.
• W1973019932 startingPage "1801" @default.
• W1973019932 abstract "Angiotensin II (Ang II) is known to accelerate the progression of macrophage-driven atherosclerotic lesions. Acyl-CoA:cholesterol acyltransferase-1 (ACAT1) converts intracellular free cholesterol into cholesterol ester (CE) for storage in lipid droplets, and promotes foam cell formation in atherosclerotic lesions. The present study explored the effect of Ang II on ACAT1 expression as a molecular mechanism of foam cell formation in primary cultured human monocyte-macrophages. Ang II significantly increased ACAT1 protein expression in a time- or concentration-dependent manner. Application of an Ang II type 1 (AT1) receptor agonist (L162313), but not an Ang II type 2 (AT2) receptor agonist (CGP42112A), mimicked the effects of Ang II treatment in inducing ACAT1 protein expression. ACAT activity and ACAT1 mRNA levels were also significantly increased by Ang II. Two-fold increases in ACAT1 protein expression and ACAT activity with Ang II treatment were completely inhibited by AT1 receptor antagonists (candesartan, [Sar1,IIe8]-Ang II), but not by an AT2 receptor antagonist (PD123319). Treatment with a G-protein inactivator (GDP-β-S), a c-Src tyrosine kinase inhibitor (PP2), a protein kinase C (PKC) inhibitor (rottlerin), or a mitogen activated protein kinase (MAPK) kinase inhibitor (PD98059) significantly reduced Ang II–induced ACAT1 protein expression. Macrophage foam cell formation assessed using acetylated low-density lipoprotein (LDL)–induced CE accumulation was significantly enhanced by Ang II, which was completely inhibited by treatment with candesartan. These results suggested that Ang II enhances foam cell formation by upregulating ACAT1 expression predominantly through the actions of AT1 receptor via the G protein/c-Src/PKC/MAPK pathway in human monocyte-macrophages." @default.
• W1973019932 created "2016-06-24" @default.
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• W1973019932 date "2008-01-01" @default.
• W1973019932 modified "2023-10-12" @default.
• W1973019932 title "Angiotensin II Upregulates Acyl-CoA:Cholesterol Acyltransferase-1 via the Angiotensin II Type 1 Receptor in Human Monocyte-Macrophages" @default.
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• W1973019932 doi "https://doi.org/10.1291/hypres.31.1801" @default.
• W1973019932 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18971559" @default.
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