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Journal of Lipid Research, Vol 38, 1445-1453, Copyright © 1997 by Lipid Research, Inc.

ARTICLES

Cholesterol 7alpha-hydroxylase influences the expression of hepatic apoA-I in two inbred mouse strains displaying different susceptibilities to atherosclerosis and in hepatoma cells

S Dueland, D France, SL Wang, JD Trawick and RA Davis
Department of Biology, San Diego State University, CA 92182-0057, USA.

C57BL/6 mice are susceptible to diet-induced atherosclerosis, whereas BALB/c mice are resistant. The susceptibility of C57BL/6 mice has been linked to decreased plasma HDL cholesterol in response to a diet containing fat, cholesterol, and cholic acid. Feeding C57BL/6 mice a diet consisting of fat and cholesterol, but no cholic acid, increased plasma high density lipoprotein (HDL) cholesterol. The increase in HDL was associated with increases in both plasma apolipoprotein (apo)A-I and hepatic apoA-I mRNA. Supplementation of the cholesterol-rich diet with cholic acid inhibited the stimulatory effect of cholesterol on hepatic apoA-I mRNA expression, resulting in similar hepatic apoA-I mRNA levels compared to chow-fed mice. Atherosclerosis-resistant BALB/c mice were also resistant to diet-induced changes in plasma HDL, apoA-I, and hepatic apoA-I mRNA levels. Previous studies showed that the diets changed both the activity and mRNA encoding the liver specific enzyme 7alpha-hydroxylase (1993.J. Lipid Res. 34: 923-931). In both strains of mice, hepatic expression of apoA-I and 7alpha-hydroxylase mRNA varied in parallel. Whereas susceptible C57BL/6 mice also showed a significant correlation between HDL cholesterol and expression of 7alpha- hydroxylase, no such correlation was observed in BALB/c mice, suggesting that genetic differences in HDL metabolism, not hepatic apoA- I synthesis, are responsible for the strain specific differences in plasma HDL levels. The finding that lecithin: cholesterol acyltransferase (LCAT) activity was significantly decreased in C57BL/6 mice, but not in BALB/ c mice fed the atherogenic diet, further supports this conclusion. Additional studies show that McArdle hepatoma cells stably expressing plasmid-derived rat 7alpha-hydroxylase recapitulated the parallel linear relationship between 7alpha- hydroxylase and apoA-I mRNA expression observed in both strains of mice. These data link hepatic apoA-I mRNA expression to hepatic cholesterol/bile acid metabolism.
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