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The Biochemistry of Lipoproteins

  • Chapter
Studies in Inherited Metabolic Disease

Summary

Lipids are transported in the blood in four major classes of lipoproteins. The triacylglycerol-rich lipoproteins are chylomicrons and very-low-density lipoproteins (VLDL) which are produced by the small intestine and liver, respectively. These lipoproteins mainly carry fatty acids to adipose tissue and muscle where the triacylglycerol is hydrolysed by lipoprotein lipase. The resulting particles that remain in the blood are chylomicron remnants and low-density lipoprotein (LDL), respectively. The remnant is taken up by the liver via endocytosis which is mediated by a specific receptor for apolipoprotein E (apoE). LDL, which are rich in cholesterol, can also be taken up by the liver or extrahepatic tissues by a receptor-mediated endocytosis that specifically recognises apoB or apoE. ‘Nascent’ high-density lipoprotein (HDL) particles are secreted by the liver and intestine and then undergo modification to become HDL3 and then HDL2 as they acquire cholesterol ester. They facilitate the reverse transport of cholesterol back to the liver.

Little is known of the hormonal regulation of lipoprotein uptake by the liver. Recently, we have shown that insulin and tri-iodothyronine (T3) increase the specific binding of LDL to cultured hepatocytes whereas dexamethasone (a synthetic glucocorticoid) has the opposite effect. The changes in binding produced by insulin and dexamethasone are paralleled by alterations in the rate of degradation of apoB. These findings may in part explain the hypercholesterolaemia and increased risk of premature atherosclerosis that can be associated with poorly controlled diabetes or hypothyroidism.

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  1. Department of Biochemistry, University of Nottingham Medical School, Queen’s Medical Centre, Nottingham, NG7 2UH, UK

    A. M. Salter & D. N. Brindley

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  1. A. M. Salter
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R. J. Pollitt R. A. Harkness G. M. Addison

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Salter, A.M., Brindley, D.N. (1988). The Biochemistry of Lipoproteins. In: Pollitt, R.J., Harkness, R.A., Addison, G.M. (eds) Studies in Inherited Metabolic Disease. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1259-5_1

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  • DOI: https://doi.org/10.1007/978-94-009-1259-5_1

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