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Insights of high-density lipoprotein apolipoprotein-mediated lipid efflux from cells
1Department of Pathology, University of Washington, Seattle, Washington 98195-7470, USA. guorong@u.washington.edu
Insights
High-density lipoprotein (HDL) removes excess lipids from cells, protecting against cardiovascular disease. A proposed model suggests HDL receptor-mediated exocytosis is key to preventing cholesterol buildup and atherosclerosis.
Area of Science:
- Biochemistry
- Cell Biology
- Cardiovascular Research
Background:
- High-density lipoprotein (HDL) plays a crucial role in reverse cholesterol transport.
- Dysfunctional lipid removal contributes to cardiovascular diseases like atherosclerosis.
Purpose of the Study:
- To review recent advancements in understanding HDL apolipoprotein-mediated lipid efflux.
- To propose a model for HDL receptor-mediated exocytosis of cellular cholesterol.
Main Methods:
- Literature review of cellular proteins involved in lipid efflux.
- Analysis of receptors, signal mediators, and transport pathways.
- Model development based on current understanding.
Main Results:
- Multiple cellular proteins facilitate HDL apolipoprotein-mediated removal of cholesterol and phospholipids.
- Key components include specific receptors, signaling molecules, and Golgi/vesicle transport systems.
- A model for HDL receptor-mediated exocytosis of cellular cholesterol is proposed.
Conclusions:
- HDL receptor-mediated exocytosis represents a significant pathway for cellular lipid removal.
- This mechanism offers a potential strategy for preventing lipid accumulation and atherogenesis.
Abstract:
High-density lipoprotein (HDL) protects against cardiovascular diseases by removal of excess lipids from cells. HDL apolipoprotein-mediated lipid efflux involves multiple cellular proteins to remove both cholesterol and phospholipids that are otherwise stored in the cells. This article reviews recent progress in the understanding of receptors, signal mediators, Golgi and vesicle transport related to the pathway and proposes a model of HDL apolipoprotein receptor-mediated exocytosis of cellular cholesterol. Such an exocytotic pathway could provide the most effective mechanism to remove excess cellular lipids and prevent atherogenesis.