The effect of cholesteryl ester transfer protein overexpression and inhibition on reverse cholesterol transport.

Abstract:

AIMS:Cholesteryl ester transfer protein (CETP) has a well-established role in lipoprotein metabolism, but the effect of its overexpression or inhibition on the efficiency of reverse cholesterol transport (RCT) is unclear. METHODS AND RESULTS:Neither overexpression of CETP nor treatment with CETP inhibitor Torcetrapib of RAW 264.7 macrophages or HepG2 hepatocytes affected cholesterol efflux in vitro. Overexpression of CETP or treatment with Torcetrapib, respectively, stimulated or inhibited HDL cholesteryl ester uptake by HepG2 but not by RAW 264.7 cells. When RAW 264.7 cells transfected with CETP or ATP binding cassette transporter A1 (ABCA1) were injected intraperitoneally into mice, cholesterol egress from macrophages was elevated for ABCA1- but not for CETP-transfected macrophages. Systemic expression of CETP in mice by adenoviral infection stimulated egress of cholesterol to plasma and liver without affecting HDL levels. Treatment with Torcetrapib did not affect appearance of macrophage cholesterol in plasma and liver, but inhibited its excretion into feces. Treatment of hamsters with Torcetrapib led to elevation of HDL cholesterol, an increase in the capacity of plasma to support cholesterol efflux, and increased egress of cholesterol from macrophages to plasma and feces in vivo. CONCLUSION:Both increased (mice study) and decreased (hamster study) CETP activity could result in enhanced RCT.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Tchoua U,D'Souza W,Mukhamedova N,Blum D,Niesor E,Mizrahi J,Maugeais C,Sviridov D

doi

10.1093/cvr/cvm087

subject

Has Abstract

pub_date

2008-03-01 00:00:00

pages

732-9

issue

4

eissn

0008-6363

issn

1755-3245

pii

cvm087

journal_volume

77

pub_type

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