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Updated: Aug 8, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

Avasimibe and atorvastatin synergistically reduce cholesteryl ester content in THP-1 macrophages

Gemma Llaverías1, Mireia Jové, Manuel Vázquez-Carrera

  • 1Unitat de Farmacologia, Departament de Farmacologia i Química Terapèutica, Facultat de Farmàcia, Universitat de Barcelona, Diagonal 643, 08028 Barcelona, Spain.

European Journal of Pharmacology
|September 12, 2002
PubMed

Insights

Combining acyl-CoA:cholesterol acyltransferase and HMG-CoA reductase inhibitors shows a synergistic effect in reducing macrophage lipid content. This suggests a direct antiatherosclerotic mechanism within the vessel wall, independent of plasma cholesterol levels.

Area of Science:

  • Biochemistry
  • Cardiovascular Research
  • Cell Biology

Background:

  • Atherosclerosis involves lipid accumulation in macrophages.
  • Inhibiting acyl-CoA:cholesterol acyltransferase (ACAT) and HMG-CoA reductase (HMGCR) may offer synergistic antiatherosclerotic benefits.
  • Previous studies suggest combined inhibition has direct effects on the vessel wall.

Purpose of the Study:

  • To investigate the synergistic effect of ACAT and HMGCR inhibition on lipid content within a single cell type.
  • To elucidate the direct cellular mechanisms underlying the antiatherosclerotic effects of combined drug therapy.
  • To avoid confounding effects of plasma cholesterol reduction observed in in vivo studies.

Main Methods:

  • Utilized an in vitro model using human macrophages (phorbol ester-treated THP-1 cells).
  • Incubated macrophages with acetylated low-density lipoproteins and varying concentrations of avasimibe (ACAT inhibitor) and atorvastatin (HMGCR inhibitor).
  • Assessed intracellular free cholesterol and cholesteryl ester content; evaluated effects of mevalonate and geranyl-geraniol.

Main Results:

  • Avasimibe demonstrated a concentration-dependent reduction in macrophage cholesteryl ester content without increasing free cholesterol.
  • Atorvastatin significantly enhanced avasimibe's cholesterol-lowering effect.
  • The synergistic effect was reversed by mevalonate and geranyl-geraniol, indicating a shared pathway.

Conclusions:

  • The study proposes a direct additive effect of ACAT and HMGCR inhibitors in reducing macrophage lipid content.
  • This cellular mechanism likely explains the synergistic antiatherosclerotic effects observed in vivo.
  • Targeting macrophage lipid metabolism directly offers a promising therapeutic strategy for atherosclerosis.

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