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Journal of Lipid Research, Vol 38, 1782-1794, Copyright © 1997 by Lipid Research, Inc.
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PH Weinstock, CL Bisgaier, T Hayek, K Aalto-Setala, E Sehayek, L Wu, P Sheiffele, M Merkel, AD Essenburg and JL Breslow
Laboratory of Biochemical Genetics and Metabolism, Rockefeller University, New York, NY 10021, USA.
To determine the physiological role of apolipoprotein (apo) A-IV, knockout mice were created by gene targeting in embryonic stem cells. In apoA-IV knockout mice, plasma cholesterol and triglyceride levels were reduced 25% and 44%, respectively, compared with controls. These changes were accounted for by decreased high density (HDL) and very low density lipoprotein (VLDL) levels, respectively, and metabolic studies indicated increased HDL-cholesteryl ester (CE) fractional catabolic rate (FCR) and reduced VLDL transport rate (TR), respectively. ApoA-IV knockout mice had greater than 70% reductions in both hepatic and intestinal apoC-III RNA levels and a similar reduction in the plasma apoC-III level. Complementation analysis, via crossbreeding of a mouse apoC-III transgene onto both the normal and apoA-IV knockout backgrounds, clearly demonstrated that the low triglyceride (VLDL) level in the apoA-IV knockout mice was due to alterations in apoC-III and not apoA-IV. ApoA-IV knockout mice had normal growth, feeding behavior, and lipid absorption, except male mice showed increased food intake in the 2 h after an 18-h fast, suggesting that under some circumstances apoA-IV might serve as a satiety factor. In summary, studies in apoA-IV-induced mutant mice have demonstrated a role for apoA-IV in increasing HDL cholesterol by inhibiting HDL cholesteryl ester FCR yet argue against the apolipoprotein as an overall important mediator of lipid absorption/metabolism.
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