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. 1995 Jul;96(1):260–272. doi: 10.1172/JCI118030

Hepatic overexpression of bovine scavenger receptor type I in transgenic mice prevents diet-induced hyperbetalipoproteinemia.

S Wölle 1, D P Via 1, L Chan 1, J A Cornicelli 1, C L Bisgaier 1
PMCID: PMC185197  PMID: 7615795

Abstract

Hepatic scavenger receptors (SR) may play a protective role by clearing modified lipoproteins before they target the artery wall. To gain insight into this hypothesized function, transgenic mice expressing hepatic bovine SR (TgSR) were created and studied when fed chow, and during diet-induced hyperlipidemia. SR overexpression resulted in extensive hepatic parenchymal cell uptake of fluorescently labeled acetylated human low density lipoprotein (DiI ac-hLDL) and a twofold increase in 125I-acetylated-LDL clearance. Food intake and cholesterol absorption was indistinguishable between control and TgSR mice. In chow-fed mice, lipoprotein cholesterol was similar in control and TgSR mice. However, on a 3-wk high fat/cholesterol (HFHC) diet, the rise in apoB containing lipoproteins was suppressed in TgSR+/- and TgSR+/+ mice. The rise in HDL was similar in control and TgSR+/- mice, but significantly elevated in the TgSR+/+ mice. Overall, on chow, the ratio of apo-B containing lipoprotein cholesterol to HDL cholesterol was similar for all groups (control = 0.33; TgSR+/- = 0.32; TgSR+/+ = 0.38). However, after 3 wk on the HFHC diet, this ratio was markedly higher in control (2.34 +/- 0.21) than in either TgSR+/- (1.00 +/- 0.24) or TgSR+/+ (1.00 +/- 0.19) mice. In TgSR+/- mice, hepatic cholesteryl esters were reduced by 59%, 7 alpha-hydroxylase mRNA levels were elevated twofold, and a significant increase in fecal bile acid flux was observed after the 3-wk HFHC diet. These results suggest SR may play a protective role in liver by preventing diet-induced increases in apoB containing lipoproteins.

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