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1 Department of Endocrinology and Metabolism C, Aarhus Amtssygehus, Aarhus University Hospital and Faculty of Health Sciences, Aarhus University and 2 Department of Endocrinology and Diabetes, Aarhus Kommunehospital, Aarhus University Hospital, DK-8000 Aarhus C, Denmark
Adiponectin is suggested to be an
important mediator of insulin resistance. Therefore, we investigated
the association between adiponectin and insulin sensitivity in 22 healthy first-degree relatives (FDR) to type 2 diabetic patients and 13 matched control subjects. Subcutaneous adipose tissue biopsies were
taken before and after a hyperinsulinemic euglycemic clamp. FDR
subjects were insulin resistant, as indicated by a reduced M
value (4.44 vs. 6.09 mg · kg
1 · min
1,
P < 0.05). Adiponectin mRNA expression was 45% lower
in adipose tissue from FDR compared with controls (P < 0.01), whereas serum adiponectin was similar in the two groups (6.4 vs.
6.6 µg/ml, not significant). Insulin infusion reduced circulating
levels of adiponectin moderately (11-13%) but significantly in
both groups (P < 0.05). In the control group,
adiponectin mRNA levels were negatively correlated with fasting insulin
(P < 0.05) and positively correlated with insulin
sensitivity (P < 0.05). In contrast, these associations were not found in the FDR group. In conclusion, FDR have
reduced adiponectin mRNA in subcutaneous adipose tissue but normal
levels of circulating adiponectin. Adiponectin mRNA levels are
positively correlated with insulin sensitivity in control subjects but
not in FDR. These findings indicate dysregulation of adiponectin gene
expression in FDR.
30-kilodalton adipose complement-related protein; gene expression; genetic predisposition to disease; insulin; first-degree relatives
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