What is the role of insulin resistance in the etiology of polycystic ovarian syndrome (PCOS)?

Updated: Sep 19, 2019
  • Author: Richard Scott Lucidi, MD, FACOG; Chief Editor: Richard Scott Lucidi, MD, FACOG  more...
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Answer

PCOS is also associated with peripheral insulin resistance and hyperinsulinemia, and obesity amplifies the degree of both abnormalities. Insulin resistance in PCOS can be secondary to a postbinding defect in insulin receptor signaling pathways, and elevated insulin levels may have gonadotropin-augmenting effects on ovarian function. Hyperinsulinemia may also result in suppression of hepatic generation of sex hormone–binding globulin (SHBG), which in turn may increase androgenicity. [15]

In addition, insulin resistance in PCOS has been associated with adiponectin, a hormone secreted by adipocytes that regulates lipid metabolism and glucose levels. Lean and obese women with PCOS have lower adiponectin levels than do women without PCOS. [16]


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