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• W2020557524 abstract "Severe high-density lipoprotein cholesterol (HDL-C) deficiency is attributed to mutations in several genes and may contribute to the genetic basis of coronary artery disease. To identify the cellular basis of a novel HDL-deficiency phenotype, we screened 54 subjects of French Canadian ancestry with severe HDL deficiency. We excluded individuals with mutations in genes currently associated with low HDL (ABCA1, LCAT, APOA-I, and SMPD1). We identified two patients in which cellular phospholipid efflux in the HDL biosynthesis process is impaired, whereas cholesterol efflux is normal. Two-dimensional gel electrophoresis analysis further showed that the two patients with impaired phospholipid efflux were defective primarily in the larger α-HDL subpopulations. In fibroblasts from affected subjects, oxysterol stimulation resulted in increased ABCA1 protein expression and normalized their defective phospholipid efflux defect. Our results indicate for the first time in humans that phospholipid and cholesterol efflux are two separate and distinct processes in cellular HDL biosynthesis. They further show for the first time that normal cellular phospholipid efflux is necessary for the formation of larger α-HDL particles. The defect in phospholipid efflux is due to defective ABCA1 protein regulation and can be corrected by treatment with physiological oxysterols, a current therapeutic target of interest, that may, with further studies, be used to raise HDL levels in patients with severe HDL deficiencies." @default.
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• W2020557524 date "2009-06-24" @default.
• W2020557524 modified "2023-10-15" @default.
• W2020557524 title "Identification of a novel human cellular HDL biosynthesis defect" @default.
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• W2020557524 doi "https://doi.org/10.1093/eurheartj/ehp250" @default.
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