alexa Effect of the interleukin-6 (-174) g c promoter polymorphism on adiponectin and insulin sensitivity.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Yang X, Jansson PA, Pellm F, Laakso M, Smith U

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Abstract We investigated the relation among the interleukin (IL)-6 (-174) G/C promoter polymorphism, adipose tissue gene expression of IL6, circulating adiponectin, and systemic insulin sensitivity. Eighty-five Swedish male subjects who had participated in our previous prediabetic phenotype characterization study were genotyped for the IL6 (-174) G/C polymorphism. Subcutaneous adipose tissue gene expression of IL6 and adiponectin was measured in 44 subjects. The IL6 (-174) G allele carriers had higher fasting plasma insulin levels (C/C, 7.8 +/- 1.1; G/C, 9.0 +/- 0.6; G/G, 10.5 +/- 1.0 mU/L) and higher homeostasis model assessment for insulin resistance (C/C, 1.6 +/- 0.2; G/C, 1.9 +/- 0.1; G/G, 2.2 +/- 0.2) compared with subjects with the C/C genotype. The circulating adiponectin levels were lower in the G allele carriers (C/C, 7.93 +/- 0.45; G/C, 7.05 +/- 0.44; G/G, 7.02 +/- 0.46 microg/mL), whereas the IL-6 levels did not differ among the three genotypes. Adipose tissue IL6 gene expression was significantly higher in the G allele carriers compared with the subjects homozygous for the C allele (C/C, 0.29 +/- 0.15; G/C, 0.84 +/- 0.29; G/G, 0.62 +/- 0.35). Our results suggest that IL6 (-174) G/C polymorphism is associated with insulin resistance and increased adipose tissue IL6 gene expression, which can impair adiponectin production. This article was published in Obes Res and referenced in Journal of Diabetes & Metabolism

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