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Journal of Lipid Research, Vol 17, 441-450, Copyright © 1976 by Lipid Research, Inc.

ARTICLES

Low density and high density lipoprotein turnover following portacaval shunt in swine

TE Carew, RP Saik, KH Johansen, CA Dennis and D Steinberg

Turnover of 125I-low density lipoprotein (LDL) and of 131I-high density lipoprotein (HDL) was determined before and after end-to-side portacaval shunt in eight swine. LDL (d 1.019-1.063) and HDL (d.1.09- 1.21) were isolated by ultracentrifugation and iodinated by the iodine monochloride technique. Immediately postoperatively there was no consistent change in the fractional catabolic rate (FCR) of LDL compared to preoperative control values, while in all animals FCR of HDL was significantly increased (by as much as 300%). After recovery from surgery, neither LDL nor HDL catabolic rates were significantly elevated above control values in four swine. However, plasma levels of LDL and HDL protein, and of LDL and HDL cholesterol were significantly reduced 10-12 weeks after the portacaval shunt. The reduced levels of LDL and HDL associated with normal fractional clearance rates imply a reduction in synthesis of LDL and HDL following portal diversion.
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