Abstract
Background and aim: Dysbalance of pro- and anti-inflammatory adipokines is a hallmark of metabolic syndrome but their nutrition-dependent regulation in healthy individuals is poorly characterized. We investigated pro-inflammatory resistin and anti-inflammatory adiponectin regulation during oral lipid ingestion (OLI) in healthy adults. Response of resistin upon free fatty acid (FFA) stimulation ...
Abstract
Background and aim: Dysbalance of pro- and anti-inflammatory adipokines is a hallmark of metabolic syndrome but their nutrition-dependent regulation in healthy individuals is poorly characterized. We investigated pro-inflammatory resistin and anti-inflammatory adiponectin regulation during oral lipid ingestion (OLI) in healthy adults. Response of resistin upon free fatty acid (FFA) stimulation was investigated in 3T3-L1 adipocytes. Material and methods: 100 healthy volunteers underwent OLI. Venous blood was drawn after 0, 2, 4, and 6hours (h). Subjects were characterized by anthropometric and standard laboratory parameters. Serum concentrations of adiponectin and resistin were measured by enzyme-linked immunosorbent assay (ELISA). Adipocytes were stimulated with FFA and concentrations of adipokines were measured by ELISA. Results: Irrespective of BMI and gender, OLI led to a significant reduction of resistin serum levels in a stepwise manner whereas adiponectin concentrations remained unchanged. There were positive correlations of resistin with waist/hip ratio and visfatin levels, as was calculated by regression analysis. Resistin concentrations were significantly higher in smokers when compared to non-smokers. Adiponectin concentrations were higher in females and in users of hormonal contraception. Adiponectin levels showed a positive correlation with heart rate and HDL cholesterol and a negative correlation with age, waist/hip-ratio, BMI, diastolic/systolic blood pressure, visfatin levels and LDL/HDL-ratio. Resistin secretion was significantly induced by palmitic acid, linoleic acid and oleic acid in adipocytes. Conclusions: OLI is a physiological repressor of systemic resistin release whereas FFA upregulate resistin release in vitro from adipocytes.
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