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Research Article Free access | 10.1172/JCI118196

Increased catabolic rate of low density lipoproteins in humans with cholesteryl ester transfer protein deficiency.

K Ikewaki, M Nishiwaki, T Sakamoto, T Ishikawa, T Fairwell, L A Zech, M Nagano, H Nakamura, H B Brewer Jr, and D J Rader

Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Molecular Disease Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.

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Published September 1, 1995 - More info

Published in Volume 96, Issue 3 on September 1, 1995
J Clin Invest. 1995;96(3):1573–1581. https://doi.org/10.1172/JCI118196.
© 1995 The American Society for Clinical Investigation
Published September 1, 1995 - Version history
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Abstract

The cholesteryl ester transfer protein (CETP) transfers lipids among lipoprotein particles and plays a central role in lipoprotein metabolism. Humans with genetic deficiency of CETP have both elevated HDL cholesterol and apolipoprotein A-I concentrations as well as decreased LDL cholesterol and apolipoprotein B levels. The present study was undertaken to elucidate the metabolic basis for the decreased LDL cholesterol and apo B levels in CETP deficiency. We conducted a series of in vivo apo B kinetic studies in tow unrelated homozygotes with CETP deficiency and in control subjects. A primed constant infusion of stable isotopically labeled phenylalanine was administered to the two CETP deficient subjects and control subjects and apo B kinetic parameters in VLDL, intermediate density lipoproteins, and LDL were obtained by using a multicompartmental model. The fractional catabolic rates (FCR) of LDL apo B were significantly increased in the CETP-deficient subjects (0.56 and 0.75/d) compared with the controls (mean FCR of 0.39/d). Furthermore, the production rates of apo B in VLDL and intermediate density lipoprotein were decreased by 55% and 81%, respectively, in CETP deficiency compared with the controls. In conclusion, CETP-deficient subjects were demonstrated to have substantially increased catabolic rates of LDL apo B as the primary metabolic basis for the low plasma levels of LDL apo B. This result indicates that the LDL receptor pathway may be up-regulated in CETP deficiency.

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