[The effect of verapamil and nifedipine on cholesterol esterification and accumulation in macrophages]

Area of Science:

• Biochemistry
• Cell Biology
• Pharmacology

Context:

• Macrophages play a crucial role in lipid metabolism and are implicated in atherosclerosis.
• Accumulation of cholesterol esters in macrophages is a hallmark of foam cell formation.
• Acetyl-low-density lipoproteins (Ac-LDL) are commonly used to induce cholesterol loading in macrophages.

Purpose:

• To investigate the effect of verapamil and nifedipine on cholesterol metabolism in mouse peritoneal macrophages.
• To determine the impact of these calcium channel blockers on cholesterol esterification and intracellular cholesterol levels.

Summary:

• Administration of verapamil and nifedipine to macrophages incubated with Ac-LDL significantly decreased 14C-oleate incorporation into cholesterol esters by 50-90%.
• These drugs increased intracellular free cholesterol content by 19-79% without affecting total cholesterol levels.
• In cholesterol-enriched macrophages, verapamil and nifedipine reduced cholesterol esterification rates, with a combined administration causing a 72.4% decrease.

Impact:

• Verapamil and nifedipine demonstrate a potent inhibitory effect on cholesterol esterification in macrophages.
• These findings suggest a potential therapeutic role for verapamil and nifedipine in modulating macrophage lipid accumulation.
• Understanding these mechanisms could offer new strategies for managing conditions associated with dyslipidemia and atherosclerosis.