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Effect of increasing the expression of cholesterol transporters (StAR, MLN64, and SCP2) on bile acid synthesis

Effect of increasing the expression of cholesterol transporters (StAR, MLN64, and SCP2) on bile acid synthesis,10.1194/jlr.M400233-JLR200,Journal of L

Effect of increasing the expression of cholesterol transporters (StAR, MLN64, and SCP2) on bile acid synthesis   (Citations: 21)
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There are two major pathways of bile acid synthe- sis: the "neutral" pathway, initiated by highly regulated mi- crosomal cholesterol 7 � -hydroxylase (CYP7A1), and an "alternative" pathway, initiated by mitochondrial sterol 27- hydroxylase (CYP27A1). In hepatocyte cultures, overexpres- sion of CYP7A1 increases bile acid synthesis by � 8-fold. However, overexpression of CYP27A1 in hepatocytes only increases it by 1.5-fold, suggesting that additional rate-limit- ing steps must be involved in the regulation of this pathway. The effects of intracellular cholesterol transport proteins on bile acid synthesis have been investigated in the current study. Under culture conditions in which the neutral path- way was inactive, selective overexpression of the gene encod- ing steroidogenic acute regulatory protein (StAR), MLN64 (StAR homolog protein), and sterol carrier protein-2 (SCP-2) led to 5.7-, 1.2-, and 1.7-fold increases, respectively, in the rates of bile acid synthesis in primary rat hepatocytes. Sur- prisingly, co-overexpression of MLN64 with StAR, SCP-2, or CYP7A1 blunted the upregulated bile acid synthesis by 48, 47, and 45%, respectively. These results suggest that MLN64, in its full-length form, is not responsible for the transport of cholesterol to the mitochondria or the endo- plasmic reticulum, where CYP27A1 or CYP7A1 is located, respectively. —Ren, S., P. Hylemon, D. Marques, E. Hall, K. Redford, G. Gil, and W. M. Pandak. Effect of increasing the expression of cholesterol transporters (StAR, MLN64, and SCP-2) on bile acid synthesis. J. Lipid Res. 2004. 45: 2123-2131.
Journal: Journal of Lipid Research - J LIPID RES , vol. 45, no. 11, pp. 2123-2131, 2004
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