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Journal of Lipid Research, Vol. 46, 687-696, April 2005
Copyright © 2005 by American Society for Biochemistry and Molecular Biology

Physiological importance of SR-BI in the in vivo metabolism of human HDL and LDL in male and female mice

Mathieu R. Brodeur, Vilayphone Luangrath, Geneviève Bourret, Louise Falstrault and Louise Brissette¹

Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada H3C 3P8

¹ To whom correspondence should be addressed. e-mail: brissette.louise{at}uqam.ca

in re-

The physiological role of murine scavenger receptor class B type I (SR-BI) was evaluated by in vivo clearances of human HDL₃ and LDL in normal and SR-BI knockout (KO) mice. In normal mice, cholesteryl esters (CEs) were removed faster than proteins, indicating a selective uptake process from both HDL₃ and LDL. SR-BI KO mice showed 80% losses of HDL-CE selective uptake and the complete loss of LDL-CE selective uptake in the first phase of clearance. However, the second phase was characterized by an acceleration of CE disappearance in SR-BI KO mice. Thus, SR-BI is the only murine receptor mediating HDL-CE selective uptake, whereas a SR-BI-independent pathway specific to LDL can rescue SR-BI deficiency. The analysis of LDL recovered 3 h after injection in mice from different genotypes revealed that LDLs are significantly depleted in CE (reduction from 19% to 50% of the CE/protein ratios). A smaller LDL size in comparison with that of noninjected LDL was also detectable but was more evident for LDL recovered from normal mice. All LDL preparations migrate faster than noninjected LDL on agarose-barbital gels.

Thus, both SR-BI-dependent and -independent pathways lead to substantial changes in LDL.

Supplementary key words scavenger receptor class B type I • liver • low density lipoprotein • high density lipoprotein • cholesteryl ester • selective uptake

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