Why the study?
Does pre-beta-1-HDL depletion or protease pretreatment affect cellular cholesterol and phospholipid efflux in cultured fibroblasts and erythrocytes?
Does pre-beta-1-HDL depletion or protease pretreatment affect cellular cholesterol and phospholipid efflux in cultured fibroblasts and erythrocytes?
The study identifies two distinct pathways for cellular cholesterol efflux, one of which is dependent on pre-beta-1-HDL and a protease-sensitive cell-surface protein in fibroblasts.
Answers are grounded in this paper and cite their sources.
Suggests distinct fibroblast versus erythrocyte efflux pathways; leaves open relevance to human reverse cholesterol transport.
Both receptor-mediated and diffusional processes have been proposed as mechanisms for the efflux of cellular cholesterol to plasma. The depletion of a minor high-density lipoprotein subfraction (pre beta-1-HDL) from plasma by incubation was associated with a proportional reduction in up to 58% of cholesterol and lecithin efflux from cultured fibroblasts. Pre beta-HDL-dependent efflux was blocked by protease pretreatment of the cells, while residual ("nonspecific") efflux was protease-insensitive. The whole of cholesterol efflux from blood erythrocytes was both pre beta-1-HDL-and protease-independent. These data suggest that two distinct pathways contribute to total efflux from fibroblast monolayers; one of these is directly proportional to plasma pre beta-1-HDL concentration and may involve a cell-surface protein.
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Kawano et al. (1993) studied this question.
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