Cited by 562Cholesterol and Lipid MetabolismMicroRNA in disease regulationLipoproteins and Cardiovascular Health

miR-33 links SREBP-2 induction to repression of sterol transporters

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Marquart, Tyler J., Allen, Ryan M., Ory, Daniel S., Baldán, Ángel·2010·Proceedings of the National Academy of Sciences

Abstract

The sterol regulatory element binding protein 2 (SREBP-2) and the liver X receptor (LXR) control antagonistic transcriptional programs that stimulate cellular cholesterol uptake and synthesis, and cholesterol efflux, respectively. The clinical importance of SREBP-2 is revealed in patients with hypercholesterolemia treated with statins, which reduce low-density lipoprotein (LDL) cholesterol levels by increasing hepatic expression of SREBP-2 and its target, the LDL receptor. Here we show that miR-33 is encoded within SREBP-2 and that both mRNAs are coexpressed. We also identify sequences in the 3' UTR of ABCA1 and ABCG1, sterol transporter genes both previously shown to be regulated by LXR, as targets for miR-33-mediated silencing. Our data show that LXR-dependent cholesterol efflux to both ApoAI and serum is ameliorated by miR-33 overexpression and, conversely, stimulated by miR-33 silencing. Finally, we show that ABCA1 mRNA and protein and plasma HDL levels decline after hepatic overexpression of miR-33, whereas they increase after hepatic miR-33 silencing. These results suggest novel ways to manage hypercholesterolemic patients.

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Crossref · 10.1073/pnas.1005191107

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39 of 39 references verified0 citation errors · 0 not checkable

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  • FBS functions as a very efficient cholesterol acceptor.

    “As reported previously (Marquart et al., 2010), FBS functioned as a very efficient cholesterol acceptor.”
  • In vivo antagonism or genetic deletion of miR-33 enhances hepatic ABCA1 expression and increases circulating HDL-cholesterol.

    “in vivo antagonism or genetic deletion of miR-33 enhances hepatic ABCA1 expression and increases circulating HDL-cholesterol (HDL-C) (Marquart et al., 2010; Najafi-Shoushtari et al., 2010; Rayner et al., 2010).”
  • miR-33a and miR-33b help prevent further loss of lipids by targeting genes involved in cholesterol trafficking and efflux and fatty acid β-oxidation.

    “miR-33a and miR-33b help prevent further loss of lipids by targeting genes involved in cholesterol trafficking and efflux”
  • miR-33a and miR-33b are intronic miRNAs encoded within the SREBP-2 and SREBP-1 genes respectively.

    “miR-33a and miR-33b are intronic miRNAs encoded within the SREBP-2 and SREBP-1 genes respectively (Marquart et al., 2010; Najafi-Shoushtari et al., 2010; Rayner et al., 2010).”
  • miR-33a and miR-33b are co-transcribed along with SREBP-2 and SREBP-1 and work in concert with their host genes to help maintain proper lipid levels within the cell.

    “This work led to the demonstration that miR-33a and miR-33b are co-transcribed along with SREBP-2 and SREBP-1, and work in concert with their host genes to help maintain proper lipid levels within the cell (Davalos et al., 2011; Marquart et al., 2010; Najafi-Shoushtari et al., 2010; Rayner et al., 2010).”

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Authors
Marquart, T. J., Allen, R. M., Ory, D. S., & Baldán, Á.
Affiliations
  • Saint Louis University (US)
  • Washington University in St. Louis (US)
Corresponding author
Baldán, Ángel
Venue
Proceedings of the National Academy of Sciences
Published
2010-06-21
Volume
107
Issue
27
Pages
12228-12232
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2154694480
Cited by
562
References
39
Citations by year
2026: 10 · 2025: 18 · 2024: 12 · 2023: 20 · 2022: 24 · 2021: 40 · 2020: 28 · 2019: 34 · 2018: 42 · 2017: 33 · 2016: 61 · 2015: 54 · 2014: 46 · 2013: 63 · 2012: 40
FWCI
43.41
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
Funders
  • Saint Louis University
  • National Institutes of Health (5p60dk020579-35, DK020579, P50 HL083762)
  • National Heart, Lung, and Blood Institute (P50 HL083762)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P60-DK-020579)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
miR-33, SREBP2, liver X receptor, sterol transporters, ABCA1, ABCG1, cholesterol efflux, HDL cholesterol, hypercholesterolemia, LDL receptor, microRNA regulation, 3' UTR targeting, hepatic cholesterol metabolism, statins
MeSH terms
ATP Binding Cassette Transporter, Subfamily G, Member 1, Animals, Base Sequence, Cell Line, Cholesterol, Gene Expression Regulation, Humans, Cholesterol, HDL, Lipoproteins, LDL, Male, Mice, Inbred C57BL, Molecular Sequence Data, Receptors, LDL, RNA, Messenger, Transfection, Transcriptional Activation, ATP-Binding Cassette Transporters, 5' Untranslated Regions, Reverse Transcriptase Polymerase Chain Reaction, Response Elements, MicroRNAs, Mice, Sterol Regulatory Element Binding Protein 2, ATP Binding Cassette Transporter 1

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