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Cholesterol Efflux Assay
07:54

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Published on: March 6, 2012

ATP binding cassette G1-dependent cholesterol efflux during inflammation.

Maria C de Beer1, Ailing Ji, Anisa Jahangiri

  • 1Departments of Physiology, University of Kentucky Medical Center, Lexington, KY, USA. mdebeer@uky.edu

Journal of Lipid Research
|December 9, 2010
PubMed
Summary

Inflammation alters high-density lipoprotein (HDL), impacting cholesterol transport by ATP binding cassette transporter G1 (ABCG1). Phospholipid enrichment, not serum amyloid A (SAA), drives these changes in HDL-mediated cholesterol efflux.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Research

Background:

  • ATP binding cassette transporter G1 (ABCG1) is crucial for cellular cholesterol efflux to high-density lipoprotein (HDL), maintaining macrophage cholesterol homeostasis.
  • HDL undergoes significant remodeling during acute inflammation, characterized by lipid changes and incorporation of serum amyloid A (SAA).

Purpose of the Study:

  • To investigate the impact of inflammation-induced HDL remodeling on ABCG1-dependent cholesterol efflux.
  • To determine the roles of SAA and phospholipid enrichment in altered HDL function during inflammation.

Main Methods:

  • Comparison of ABCG1-mediated cholesterol efflux using normal and acute phase (AP) mouse HDL.
  • Analysis of HDL from SAA knockout (SAAKO) mice.
  • Enzymatic hydrolysis of AP HDL with Group IIA secretory phospholipase A(2) (sPLA(2)-IIA).

Main Results:

  • Lipid-free SAA mimics apolipoprotein A-I in mediating cholesterol efflux from ABCA1 and ABCG1.
  • AP HDL with SAA showed a modest increase in ABCG1-dependent efflux compared to normal HDL.
  • AP HDL from SAAKO mice enhanced ABCG1 efflux more than AP HDL with SAA.
  • sPLA(2)-IIA hydrolysis reduced AP HDL's ability to facilitate ABCG1-mediated cholesterol transfer, indicating phospholipid enrichment is key.
  • AP human HDL, lacking PL enrichment, was less effective in ABCG1 efflux than normal human HDL.

Conclusions:

  • Inflammatory HDL remodeling affects ABCG1-dependent cholesterol efflux independently of SAA presence.
  • Phospholipid enrichment of HDL during inflammation is the primary driver of altered ABCG1-mediated cholesterol efflux.