Uncoupling between insulin and release of a D-chiro-inositol-containing inositolphosphoglycan mediator of insulin action in obese women With polycystic ovary syndrome.

Abstract

BACKGROUND:

Obese women with polycystic ovary syndrome (PCOS) manifest impaired insulin-stimulated release of a d-chiro-inositol-containing inositolphosphoglycan (DCI-IPG) insulin mediator during oral glucose tolerance testing (OGTT), which appears to be restored by the administration of metformin. This suggests that either obesity or PCOS is associated with a defect in the coupling of the stimulation of the insulin receptor by insulin to the release of the DCI-IPG mediator. The objective of this study was to compare the release of bioactive DCI-IPG between normal nonobese women and obese PCOS women during stimulation with two different concentrations of insulin when glucose levels are clamped.

METHODS:

We performed a cross-sectional case-control study at the clinical research center of an academic medical center. A two-step euglycemic-hyperinsulinemic clamp was carried out in 8 nonobese normal and 8 obese PCOS women, during which DCI-IPG bioactivity was monitored.

RESULTS:

At baseline, PCOS women were significantly more obese, hyperinsulinemic, and insulin resistant than the controls. During the clamp studies, DCI-IPG bioactivity increased significantly over the first 45 min of the low-insulin step of the clamp in normal nonobese women (P = 0.046) and then decreased to baseline levels; DCI-IPG increased again after initiation of the high-insulin step (P = 0.029). Despite higher insulin levels during the clamp in PCOS women, DCI-IPG bioactivity remained flat throughout both insulin steps and was thus significantly lower than in controls during the initial periods of both steps.

CONCLUSIONS:

The coupling between insulin action and the release of the DCI-IPG mediator is selectively impaired in obese PCOS women, which may contribute to the insulin resistance in these women.

• Authors: Jean-Patrice Baillargeon, Maria J Iuorno, Teimuraz Apridonidze, John E Nestler
• Journal: Metabolic syndrome and related disorders (Metab Syndr Relat Disord) Vol. 8 Issue 2 Pg. 127-36 (Apr 2010) ISSN: 1557-8518 [Electronic] United States
• PMID: 20156067 (Publication Type: Controlled Clinical Trial, Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Hypoglycemic Agents
• Inositol Phosphates
• Insulin
• Polysaccharides
• inositol phosphate glycan
• Inositol
• Diazoxide

Topics

• Adolescent
• Adult
• Case-Control Studies
• Cross-Sectional Studies
• Diazoxide (administration & dosage, pharmacology)
• Female
• Glucose Clamp Technique
• Humans
• Hypoglycemic Agents (administration & dosage, pharmacology)
• Inositol (chemistry, metabolism)
• Inositol Phosphates (chemistry, metabolism)
• Insulin (administration & dosage, blood, metabolism, pharmacology)
• Obesity (blood, complications, metabolism)
• Polycystic Ovary Syndrome (blood, complications, metabolism)
• Polysaccharides (chemistry, metabolism)
• Signal Transduction (drug effects)
• Young Adult