Resistin increases lipid accumulation and CD36 expression in human macrophages

Area of Science:

• Biochemistry
• Immunology
• Cell Biology

Background:

• Lipid accumulation in macrophages is central to atherosclerosis pathogenesis.
• Resistin, an adipocytokine primarily from monocytes, is implicated in atherosclerosis.
• Understanding resistin's role in macrophage lipid metabolism is crucial.

Purpose of the Study:

• To investigate the effect of resistin on lipid accumulation in human macrophages.
• To examine the impact of oxidized low-density lipoprotein (oxLDL) on resistin expression.
• To elucidate the molecular mechanisms by which resistin influences macrophage lipid uptake.

Main Methods:

• Human macrophages were treated with resistin and/or oxLDL.
• Resistin mRNA and protein expression were quantified.
• Lipid droplet accumulation was assessed using Nile red staining.
• Expression of scavenger receptors CD36 and SR-A was analyzed at mRNA and protein levels.

Main Results:

• Oxidized LDL (oxLDL) significantly increased resistin mRNA expression in macrophages.
• Resistin treatment led to increased lipid droplet accumulation and size.
• Resistin upregulated CD36 expression (mRNA and protein) but not SR-A.
• Native LDL did not affect resistin expression.

Conclusions:

• Resistin promotes lipid accumulation in human macrophages.
• Resistin enhances lipid uptake by upregulating CD36 cell surface expression.
• Resistin may function as a key modulator in macrophage-to-foam cell transformation, impacting atherosclerosis.