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• W1978695220 abstract "Oxidized LDL (ox-LDL) plays a critical role in atherogenesis, including apoptosis. As hypercholesterolemia causes epigenetic changes resulting in long-term phenotypic consequences, we hypothesized that repeated and continuous exposure to ox-LDL may alter the pattern of apoptosis in human umbilical vein endothelial cells (HUVECs). We also analyzed global and promoter-specific methylation of apoptosis-related genes. As expected, ox-LDL evoked a dose-dependent increase in apoptosis in the first passage HUVECs that was completely abrogated by lectin-like ox-LDL receptor (LOX-1)-neutralizing antibody. Ox-LDL-induced apoptosis was associated with upregulation of proapoptotic LOX-1, ANXA5, BAX, and CASP3 and inhibition of antiapoptotic BCL2 and cIAP-1 genes accompanied with reciprocal changes in the methylation of promoter regions of these genes. Subsequent passages of cells displayed attenuated apoptotic response to repeat ox-LDL challenge with blunted gene expression and exaggerated methylation of LOX-1, BAX, ANXA5, and CASP3 genes (all P < 0.05 vs. first exposure to ox-LDL). Treatment of cells with LOX-1 antibody before initial ox-LDL treatment prevented both gene-specific promoter methylation and expression changes and reduction of apoptotic response to repeat ox-LDL challenge. Based on these data, we conclude that exposure of HUVECs to ox-LDL induces epigenetic changes leading to resistance to apoptosis in subsequent generations and that this effect may be related to the LOX-1-mediated increase in DNA methylation." @default.
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• W1978695220 date "2011-08-01" @default.
• W1978695220 modified "2023-10-16" @default.
• W1978695220 title "Prior exposure to oxidized low-density lipoprotein limits apoptosis in subsequent generations of endothelial cells by altering promoter methylation" @default.
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• W1978695220 doi "https://doi.org/10.1152/ajpheart.00252.2011" @default.
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