Cited by 124Cholesterol and Lipid MetabolismAtherosclerosis and Cardiovascular DiseasesLipoproteins and Cardiovascular Health

Knockdown expression and hepatic deficiency reveal an atheroprotective role for SR-BI in liver and peripheral tissues

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Huby, T., Doucet, C., Dachet, C., Ouzilleau, B., Ueda, Y., Afzal, V., Rubin, E., Chapman, M. J. +1 more·2006·Journal of Clinical Investigation

Abstract

Scavenger receptor SR-BI has been implicated in HDL-dependent atheroprotective mechanisms. We report the generation of an SR-BI conditional knockout mouse model in which SR-BI gene targeting by loxP site insertion produced a hypomorphic allele (hypomSR-BI). Attenuated SR-BI expression in hypomSR-BI mice resulted in 2-fold elevation in plasma total cholesterol (TC) levels. Cre-mediated SR-BI gene inactivation of the hypomorphic SR-BI allele in hepatocytes (hypomSR-BI-KO(liver)) was associated with high plasma TC concentrations, increased plasma free cholesterol/TC (FC/TC) ratio, and a lipoprotein-cholesterol profile typical of SR-BI-/- mice. Plasma TC levels were increased 2-fold in hypomSR-BI and control mice fed an atherogenic diet, whereas hypomSR-BI-KO(liver) and SR-BI-/- mice developed severe hypercholesterolemia due to accumulation of FC-rich, VLDL-sized particles. Atherosclerosis in hypomSR-BI mice was enhanced (2.5-fold) compared with that in controls, but to a much lower degree than in hypomSR-BI-KO(liver) (32-fold) and SR-BI-/- (48-fold) mice. The latter models did not differ in either plasma lipid levels or in the capacity of VLDL-sized lipoproteins to induce macrophage cholesterol loading. However, reduced atherosclerosis in hypomSR-BI-KO(liver) mice was associated with decreased lesional macrophage content as compared with that in SR-BI-/- mice. These data imply that, in addition to its major atheroprotective role in liver, SR-BI may exert an antiatherogenic role in extrahepatic tissues.

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Authors
Huby, T., Doucet, C., Dachet, C., Ouzilleau, B., Ueda, Y., Afzal, V., Rubin, E., Chapman, M. J., & Lesnik, P.
Affiliations
  • Inserm (FR)
  • Kyoto University (JP)
  • Lawrence Berkeley National Laboratory (US)
Corresponding author
Huby, T.
Venue
Journal of Clinical Investigation
Published
2006-10-02
Volume
116
Issue
10
Pages
2767-2776
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2041324378
Cited by
124
References
48
Citations by year
2026: 1 · 2025: 5 · 2024: 2 · 2023: 3 · 2022: 7 · 2021: 5 · 2020: 6 · 2019: 8 · 2018: 8 · 2017: 5 · 2016: 4 · 2015: 8 · 2014: 11 · 2013: 3 · 2012: 7
FWCI
8.13
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
  • Pfizer
  • Institut National de la Santé et de la Recherche Médicale
  • Assistance Publique - Hôpitaux de Paris
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
scavenger receptor class B type I, atherosclerosis, hypercholesterolemia, HDL cholesterol, conditional knockout mice, free cholesterol, VLDL, atherogenic diet, serum cholesterol
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 1, CD68 Molecule, Alleles, Animals, Apolipoproteins, Cholesterol, Diet, Atherogenic, Female, Lipoproteins, Cholesterol, HDL, Cholesterol, LDL, Liver, Macrophages, Male, Mice, Inbred C57BL, Mice, Transgenic, Sex Factors, Triglycerides, Antigens, Differentiation, Myelomonocytic, Cholesterol, VLDL, Antigens, CD, Interleukin-6, Gene Expression, Mice, Knockout, ATP-Binding Cassette Transporters, Atherosclerosis, Scavenger Receptors, Class B, Mice

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