Insulin Decreases Human Adiponectin Plasma Levels

Abstract

Insulin resistance and hyperinsulinemia are known atherosclerosis risk factors. The association between adiponectin plasma levels and obesity, insulinemia, and atherosclerosis has been shown. Thus, adiponectin may be a link between hyperinsulinemia and vascular disease. In vitro data demonstrated a reduction of adiponectin expression by insulin. However, it is still unclear whether insulin regulates adiponectinemia in vivo in humans. Five healthy male volunteers were studied. Circulating adiponectin levels were determined before and during hyperinsulinemic euglycemic clamp. Adiponectin was measured by radioimmunoassay. Hyperinsulinemia (85.0 ± 33.2 at baseline vs. 482.8 ± 64.4 pmol/l during steady state; p < 0.01) was achieved using a euglycemic hyperinsulinemic clamp, keeping blood glucose levels basically unchanged during the intervention (4.6 ± 0.14 vs. 4.37 ± 0.15 mmol/l, respectively; ns). We found a significant decrease of adiponectin plasma levels during the steady state of hyperinsulinemic euglycemic clamp (26.7 ± 3.5 µg/ml) compared to baseline levels (30.4 ± 5 µg/ml; p < 0.05). Hyperinsulinemia caused a significant decrease of adiponectin plasma levels under euglycemic conditions. Considering existing data about adiponectin dependent effects, hypoadiponectinemia might at least partly be a link between hyperinsulinemia and vascular disease in metabolic syndrome.

Key words

Adiponectin - Insulin Resistance - Atherosclerosis - Diabetes - Insulin - Cytokine - Obesity

References

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