Testosterone up-regulates scavenger receptor bi and stimulates cholesterol efflux from macrophages
Biochemical and Biophysical Research Communications , Volume 296 - Issue 5 p. 1051- 1057
By lowering high density lipoprotein (HDL) cholesterol, testosterone contributes to the gender difference in HDL cholesterol and has been accused to be pro-atherogenic. The mechanism by which testosterone influences HDL cholesterol is little understood. We therefore investigated the effect of testosterone on the gene expression of apolipoprotein A-I (apoA-I), hepatic lipase (HL), scavenger receptor B1 (SR-BI), and the ATP binding cassette transporter A1 (ABCA1), all of which are important regulators of HDL metabolism. In both cultivated HepG2 hepatocytes and primary human monocyte-derived macrophages, testosterone led to a dose-dependent up-regulation of SR-BI, which was assessed on both the mRNA and the protein levels. As a functional consequence, we observed an increased HDL3-induced cholesterol efflux from macrophages. At supraphysiological dosages, testosterone also increased the expression of HL in HepG2 cells. Testosterone had no effect on the expression of apoA-I in HepG2 cells and ABCA1 in either HepG2 cells or macrophages. These data suggest that testosterone, despite lowering HDL cholesterol, intensifies reverse cholesterol transport and thereby exerts an anti-atherogenic rather than a pro-atherogenic effect.
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Langer, C, Gansz, B, Goepfert, C, Engel, T, Uehara, Y, von Dehn, G, … von Eckardstein, A. (2002). Testosterone up-regulates scavenger receptor bi and stimulates cholesterol efflux from macrophages. Biochemical and Biophysical Research Communications, 296(5), 1051–1057. doi:10.1016/S0006-291X(02)02038-7