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• W2061640456 endingPage "39981" @default.
• W2061640456 startingPage "39971" @default.
• W2061640456 abstract "To identify genes involved in the regulation of plasma high density lipoprotein (HDL) cholesterol (HDL-C) levels, patients with low HDL-C and age- and sex-matched controls (normal HDL-C) were extensively characterized. Comparative transcriptome analysis was carried out in cholesterol-loaded monocyte-derived macrophages from low HDL subjects segregated into groups with or without cholesterol efflux defects or ABCA1 mutations. Clusters of differentially regulated genes were evident in the low HDL groups as compared with controls. Of particular note, expression of cathepsin D (CTSD), a lysosomal proteinase, was reduced by ∼50% in monocyte-derived macrophages of low HDL-C subjects, most significantly those with cholesterol efflux defects but without mutations in ABCA1 (p < 0.01). These results were verified by reverse transcription-PCR and replicated in a second cohort. We show here that blocking the activity or expression of CTSD, by pepstatin or CTSD small interfering RNA, respectively, reduced ABCA1 expression and protein abundance in both macrophages and CHO cells and apolipoprotein A-I-mediated lipid efflux by more than 70%. Conversely, expression of CTSD increased both ABCA1 mRNA expression and cellular ABCA1 protein. Consistent with its role in the proteolytic processing of prosaposin, inactivation of CTSD function resulted in the accumulation of glycosphingo-lipid and free cholesterol in late endosomes/lysosomes, a phenotype similar to NPC1 deficiency. Inhibition of CTSD also caused retention of ABCA1 in lysosomal compartments, reducing its trafficking to the plasma membrane. These studies demonstrate a novel and potentially important role for CTSD in intracellular cholesterol trafficking and ABCA1-mediated efflux. Therefore, decreased CTSD expression may contribute to low plasma HDL-C levels." @default.
• W2061640456 created "2016-06-24" @default.
• W2061640456 creator A5011922756 @default.
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• W2061640456 date "2006-12-01" @default.
• W2061640456 modified "2023-10-08" @default.
• W2061640456 title "Cathepsin D, a Lysosomal Protease, Regulates ABCA1-mediated Lipid Efflux" @default.
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• W2061640456 doi "https://doi.org/10.1074/jbc.m605095200" @default.
• W2061640456 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17032648" @default.
• W2061640456 hasPublicationYear "2006" @default.
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