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Journal of Clinical Endocrinology & Metabolism, Vol 67, 341-347, Copyright © 1988 by Endocrine Society

ARTICLES

Role of gestational hormones in the induction of insulin resistance

EA Ryan and L Enns
Department of Medicine, University of Alberta, Edmonton, Canada.

Pregnancy is associated with insulin resistance. We studied insulin binding and postbinding function in isolated adipocytes from pregnant and nonpregnant rats. We also used a primary culture system for female virgin rat adipocytes to assess the effects of gestational hormones in vitro on insulin binding and postbinding function. Insulin binding to adipocytes was normal during pregnancy, but [14C]3-O-methylglucose transport was reduced. When hCG or estradiol was added to the culture medium, no change in maximum [14C]3-O-methylglucose transport was found; however, maximum insulin binding was increased with estradiol. Progesterone and cortisol both decreased maximum insulin binding and [14C]3-O-methylglucose transport. PRL and placental lactogen decreased maximum [14C]3-O-methylglucose transport, but did not change insulin binding. When these hormones were added concurrently no change in insulin binding was found, but maximum [14C]3-O-methylglucose transport was reduced. We conclude that the insulin resistance of pregnancy is associated with a postbinding defect in insulin action. Estradiol increased insulin receptor binding, but during pregnancy this effect may be offset by the reduction in insulin binding induced by progesterone and cortisol. The postbinding defect in insulin action during pregnancy is probably related to increasing amounts of progesterone, cortisol, PRL, and placental lactogen.


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