Effects of Adiponectin in TNF-α, IL-6, and IL-10 Cytokine Production from Coronary Artery Disease Macrophages

Abstract

Adiponectin, an adipose tissue secreted protein, exhibits anti-inflammatory and antiatherogenic properties. We examined the effects of the globular and full-length adiponectin on cytokine production in macrophages derived from Coronary Artery Disease (CAD) patients and control individuals. Adiponectin's effects in human macrophages upon lipopolysaccharide (LPS) treatment were also examined. Full length adiponectin acted differently on TNF-α and IL-6 production by upregulating TNF-α and IL-6 protein production, but not their mRNA expression. Additionally, full length adiponectin was unable to abrogate LPS proinflammatory effect in TNF-α and IL-6 mRNA expression in CAD and NON-CAD macrophages. In contrast, globular adiponectin appeared to have proinflammatory properties by potently upregulating TNF-α and IL-6 mRNA and protein secretion in human macrophages while subsequently rendered cells resistant to further proinflammatory stimuli. Moreover, both forms of adiponectin powerfully suppressed scavenger MSR-AI mRNA expression and augmented IL-10 protein release, both occurring independently of the presence of LPS or CAD. These data indicate that adiponectin could potentially protect human macrophages via the elevated IL-10 secretion and the suppression of MSR-AI expression. It can also be protective in CAD patients since the reduced adiponectin-induced IL-6 release in CAD macrophages compared to controls, could be beneficial in the development of inflammation related atherosclerosis.

Key words

proinflammatory cytokines - atherosclerosis - adiponectin - macrophages

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