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Related Experiment Video

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High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay
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MD-2 binds cholesterol.

Soo-Ho Choi1, Jungsu Kim1, Ayelet Gonen1

  • 1Department of Medicine, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA 92093, USA.

Biochemical and Biophysical Research Communications
|January 26, 2016
PubMed
Summary
This summary is machine-generated.

Cholesterol binds to myeloid differentiation-2 (MD-2), a key molecule in toll-like receptor-4 (TLR4) signaling. This interaction explains how oxidized cholesterol esters (OxCE) trigger inflammation in cardiovascular disease.

Keywords:
CholesterolLPSMD-2TLR4

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Area of Science:

  • Biochemistry
  • Immunology
  • Cardiovascular Research

Background:

  • Cholesterol esters (CE) are transported via low-density lipoprotein.
  • Oxidized CE (OxCE) is implicated in cardiovascular disease and inflammation.
  • OxCE activates inflammatory responses through toll-like receptor-4 (TLR4) in macrophages.

Purpose of the Study:

  • To investigate the molecular mechanism of OxCE-induced TLR4 activation.
  • To determine if cholesterol binds to MD-2, an essential TLR4 ancillary molecule.
  • To explore the biological significance of cholesterol binding to MD-2.

Main Methods:

  • Investigated cholesterol binding to myeloid differentiation-2 (MD-2).
  • Utilized competition assays with lipopolysaccharide (LPS) and OxCE-modified BSA.
  • Analyzed MD-2 from human plasma and mouse atherosclerotic lesions for cholesterol presence.

Main Results:

  • Demonstrated direct binding of cholesterol to MD-2.
  • Showed that LPS and OxCE-modified BSA can compete for cholesterol binding to MD-2.
  • Confirmed cholesterol presence in soluble MD-2 from human plasma and in MD-2 within mouse atherosclerotic lesions.

Conclusions:

  • Cholesterol binding to MD-2 is a key step in OxCE-mediated TLR4 activation.
  • This interaction provides insight into the molecular basis of chronic inflammation in atherosclerosis.
  • Findings highlight the role of MD-2 in mediating inflammatory responses to oxidized lipids.