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Pharmacological control of phagocyte function: inhibition of cholesterol accumulation

R Paoletti1, S Bellosta, F Bernini

  • 1Institute of Pharmacological Sciences, University of Milan, Italy.

Annals of the New York Academy of Sciences
|August 15, 1998
PubMed

Insights

Certain calcium antagonists and HMG-CoA reductase inhibitors (vastatins) can control cellular cholesterol accumulation in macrophages, offering potential pharmacological targets for atherosclerosis treatment.

Area of Science:

  • Biomedical Science
  • Cell Biology
  • Pharmacology

Background:

  • Mononuclear phagocyte-derived foam cells are key in atherosclerotic lesion development.
  • Macrophages accumulate cholesterol during atherogenesis, contributing to plaque instability.
  • Targeting macrophage cholesterol accumulation is a strategy against atherosclerosis.

Purpose of the Study:

  • To investigate the effects of calcium antagonists on cholesterol esterification in macrophages.
  • To evaluate the impact of HMG-CoA reductase inhibitors (vastatins) on cholesterol deposition in macrophages.

Main Methods:

  • Cultured human and murine macrophages were used.
  • Studied the effect of calcium antagonists on cellular cholesterol esterification.
  • Assessed the inhibition of modified LDL endocytosis by fluvastatin and simvastatin.

Main Results:

  • Vastatins (fluvastatin, simvastatin) prevented cholesterol deposition in macrophages by inhibiting modified LDL endocytosis.
  • Vastatin efficacy was greater in cholesterol-loaded macrophages (foam cells) than in normal cells.
  • Calcium antagonists were also studied for their effects on cellular cholesterol esterification.

Conclusions:

  • Pharmacological control of macrophage cholesterol accumulation is achievable in vitro using calcium antagonists and vastatins.
  • These agents may offer therapeutic benefits for atherosclerosis independent of their effects on blood pressure or blood cholesterol levels.

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