Cited by 39Cholesterol and Lipid MetabolismCaveolin-1 and cellular processesDrug Transport and Resistance Mechanisms

Caveolin-1 interacts with ATP binding cassette transporter G1 (ABCG1) and regulates ABCG1-mediated cholesterol efflux

Gu, Hong-mei, Wang, Fa-qi, Zhang, Da-wei·2014·Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids

Abstract

ATP-binding cassette transporter G1 (ABCG1) plays an important role in macrophage reverse cholesterol transport in vivo by promoting cholesterol efflux onto lipidated apoA-I. However, the underlying mechanism is unclear. Here, we found that ABCG1 co-immunoprecipitated with caveolin-1 (CAV1) but not with flotillin-1 and -2. Knockdown of CAV1 expression using siRNAs significantly reduced ABCG1-mediated cholesterol efflux without detectable effect on ABCA1-mediated cholesterol efflux. Disruption of the putative CAV1 binding site in ABCG1, through replacement of tyrosine residues at positions 487 and 489 or at positions 494 and 495 with alanine (Y487AY489A and Y494AY495A), impaired the interaction of ABCG1 with CAV1 and significantly decreased ABCG1-mediated cholesterol efflux. The substitution of Tyr494 and Tyr495 with Phe or Trp that resulted in an intact CAV1 binding site had no effect. Furthermore, Y494AY495A affected trafficking of ABCG1 to the cell surface. The mutant protein is mainly located intracellularly. Finally, we found that CAV1 co-immunoprecipitated with ABCG1 and regulated cholesterol efflux to reconstituted HDL in THP-1-derived macrophages upon the liver X receptor agonist treatment. These findings indicate that CAV1 interacts with ABCG1 and regulates ABCG1-mediated cholesterol efflux.

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Crossref · 10.1016/j.bbalip.2014.02.002

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Authors
Gu, H.-M., Wang, F.-Q., & Zhang, D.-W.
Affiliations
University of Alberta (CA)
Venue
Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids
Publisher
Elsevier BV
Published
2014-06
Volume
1841
Issue
6
Pages
847-858
ISSN
1388-1981 (ISSN-L)
OpenAlex
W1997893510
Cited by
39
References
55
Citations by year
2026: 3 · 2024: 3 · 2023: 3 · 2022: 2 · 2021: 7 · 2020: 3 · 2019: 4 · 2018: 6 · 2017: 3 · 2016: 3 · 2015: 1 · 2014: 1
FWCI
2.64
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Canadian Institutes of Health Research (MOP 93794)
  • Alberta Heritage Foundation for Medical Research
  • Canadian Foundation for Innovation
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Caveolin-1 and cellular processes
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
caveolin-1, ABCG1, ABC transporters, cholesterol efflux, reverse cholesterol transport, macrophages, protein-protein interaction, ABCA1, liver X receptor, flotillin, THP-1 macrophages
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 1, Liver X Receptors, Binding Sites, Biological Transport, Cholesterol, Humans, Membrane Proteins, Protein Binding, ATP-Binding Cassette Transporters, RNA, Small Interfering, Caveolin 1, Orphan Nuclear Receptors

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