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The assembly of lipids into lipoproteins during secretion

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Summary

The process of assembly and secretion of lipoproteins is discussed with particular reference to the role of lipids. The majority of circulating lipoproteins is produced by the liver (80%) with the remainder being supplied by the intestine. The liver secretes both very low density lipoproteins and high density lipoproteins, but the assembly and secretion of these two types of particles may follow different routes. The major lipid components of lipoproteins are triacylglycerols, cholesterol, cholesterol esters and phospholipids. The biosynthesis of these lipids occurs on membranes of the endoplasmic reticulum, with many of the enzymes also being present in the Golgi; the roles of these two subcellular organelles in the assembly of lipoproteins are discussed. There appears to be a compartmentalization of lipids in cells, such that defined pools, often those newly-synthesized, are preferred, or even required, for lipoprotein assembly. The process of hepatic very low density lipoprotein secretion appears to be regulated by the supply of lipids. Indeed, the synthesis of new lipid may be a major driving force in lipoprotein assembly and secretion.

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  1. Lipid and Lipoprotein Group and Department of Medicine, University of Alberta, T6G 292, Edmonton, Alberta, Canada

    J. E. Vance

  2. Lipid and Lipoprotein Group and Department of Biochemistry, University of Alberta, T6G 292, Edmonton, Alberta, Canada

    D. E. Vance

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Vance, J.E., Vance, D.E. The assembly of lipids into lipoproteins during secretion. Experientia 46, 560–569 (1990). https://doi.org/10.1007/BF01939694

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