出版社：American Society for Biochemistry and Molecular Biology
摘要：Recent in vitro studies have provided evidence that hepatic lipase (HL) facilitates the selective uptake of HDL cholesteryl esters (CE), but the in vivo physiological relevance of this process has not been demonstrated. To evaluate the role that HL plays in facilitating the selective uptake of HDL-CE in vivo, we studied the metabolism of [3H]CEt, 125I-labeled apolipoprotein (apo) A-I, and 131I-labeled apoA-II-labeled HDL in HL-deficient mice. Kinetic analysis revealed similar catabolism of 125I-labeled apoA-I (as well as 131I-labeled apoA-II) in C57BL controls and HL deficient mice, with fractional catabolic rates (FCR) of 2.17 ± 0.15 and 2.16 ± 0.11 d−1 (2.59 ± 0.14 and 2.67 ± 0.13 d−1, respectively). In contrast, despite similar hepatic scavenger receptor BI expression, HL-deficient mice had delayed clearance of [3H]CEt compared to controls (FCR = 3.66 ± 0.29 and 4.41 ± 0.18 d−1, P 3H]CEt in HL-deficient mice (62.3 ± 2.1% of total) was significantly less than in controls (72.7 ± 3.0%), while the [3H]CEt remaining in the plasma compartment increased (20.7 ± 1.8% and 12.6 ± 0.5%) ( P —Lambert, G., M. J. A. Amar, P. Martin, J. Fruchart-Najib, B. Föger, R. D. Shamburek, H. B. Brewer, Jr., and S. Santamarina-Fojo. Hepatic lipase deficiency decreases the selective uptake of HDL-cholesteryl esters in vivo. J. Lipid Res. 2000. 41: 667–672.
关键词：reverse cholesterol transport ; apoA-I ; apoA-II ; SR-BI
