Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 284, Issue 10, Pages 6093-6100Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M807683200
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- Netherlands Organization for Scientific Research [917-56-358]
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Endothelial lipase (EL) is a negative regulator of high density lipoprotein (HDL) cholesterol plasma levels, and scavenger receptor BI (SR-BI) is involved in remodeling of HDL. The present study investigates the requirement of SR-BI for the effects of EL- mediated phospholipid hydrolysis on HDL metabolism in vivo. In vitro, selective uptake from EL- modified HDL was 129% higher than selective uptake from control HDL in SR-BI-overexpressing cells (p = 0.01). In vivo overexpression of human EL by means of recombinant adenovirus decreased HDL plasma levels significantly (p < 0.01). Fast protein liquid chromatography analysis and agarose gel electrophoresis revealed that EL expression resulted in the generation of small pre-beta HDL particles in wild-type mice, whereas in SR-BI-/- mice small HDL were preferentially removed. In kinetic experiments the fractional catabolic rate (FCR) of HDL cholesteryl ester increased by 110% (p < 0.001), and the FCR of HDL apolipoproteins increased by 64% (p < 0.001) in response to EL overexpression in wild-type mice. In SR-BI-/- mice a similar increase in the HDL apolipoprotein FCR occurred (p < 0.001); however, there was no further increase in HDL cholesteryl ester catabolism. The apparent whole body selective uptake was increased 3-fold by EL in wild-type mice (p < 0.001), whereas there was no selective uptake in SR-BI knock-out mice. EL overexpression increased hepatic selective uptake as well as holoparticle uptake (each p < 0.01) in wild-typemice, whereas in SR-BI knock-out mice only holoparticle uptake increased (p < 0.01). Our results indicate that SR-BI-mediated selective uptake of HDL cholesteryl ester is essential for the remodeling of large alpha-migrating HDL particles by EL.
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