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Acute hyperinsulinemia decreases plasma osteoprotegerin with diminished effect in type 2 diabetes and obesity

Gitte Maria Jørgensen1, Birgitte Vind, Mads Nybo

  • 1Department of Biochemistry, Pharmacology and Genetics, Odense University Hospital, Sdr. Boulevard 29, DK-5000 Odense, Denmark.

European Journal of Endocrinology
|April 22, 2009
PubMed
Abstract

Insights

Insulin lowers plasma osteoprotegerin (OPG) levels, but this effect is reduced in individuals with type 2 diabetes and obesity. This finding may explain elevated OPG in vascular disease.

Area of Science:

  • Endocrinology
  • Metabolic Syndrome
  • Cardiovascular Research

Background:

  • Osteoprotegerin (OPG) is a key regulator of bone metabolism and vascular calcification.
  • OPG accumulates in the arterial wall in diabetes, and its synthesis is reduced by insulin.
  • Understanding insulin's effect on plasma OPG is crucial for managing cardiovascular risk in diabetes and obesity.

Purpose of the Study:

  • To investigate the acute effects of insulin on plasma OPG concentrations.
  • To compare these effects in individuals with type 2 diabetes, obesity, and lean controls.

Main Methods:

  • A 4-hour euglycemic-hyperinsulinemic clamp was performed on 30 subjects (10 type 2 diabetic, 10 obese, 10 lean).
  • Plasma OPG, insulin, glucose, HbA1c, lipids, and free fatty acids were measured before and after the clamp.

Main Results:

  • Insulin infusion significantly decreased plasma OPG in all groups.
  • The reduction in OPG was approximately 50% less pronounced in obese and type 2 diabetic individuals compared to lean controls.
  • Baseline OPG correlated with fasting insulin, lactate, LDL cholesterol, and FFA, depending on the group.

Conclusions:

  • Acute hyperinsulinemia reduces plasma OPG, but this effect is blunted in type 2 diabetes and obesity.
  • Diminished insulin-mediated OPG reduction may contribute to increased arterial and plasma OPG levels in these conditions.
  • These findings link insulin resistance, OPG dysregulation, and cardiovascular risk in diabetes and obesity.

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