Cited by 337Ovarian function and disordersDiabetes, Cardiovascular Risks, and LipoproteinsMetabolism, Diabetes, and Cancer

Defects in insulin receptor signaling in vivo in the polycystic ovary syndrome (PCOS)

Dunaif, Andrea, Wu, Xinqi, Lee, Anna, Diamanti-Kandarakis, Evanthia·2001·American Journal of Physiology-Endocrinology and Metabolism

Abstract

Women with polycystic ovary syndrome (PCOS) are insulin resistant secondary to a postbinding defect in insulin signaling. Sequential euglycemic glucose clamp studies at 40 and 400 mU · m −2 · min −1 insulin doses with serial skeletal muscle biopsies were performed in PCOS and age-, weight-, and ethnicity-matched control women. Steady-state insulin levels did not differ, but insulin-mediated glucose disposal was significantly decreased in PCOS women ( P < 0.05). Insulin receptor substrate (IRS)-1-associated phosphatidylinositol 3-kinase (PI 3K) activity was significantly decreased in PCOS ( n = 12) compared with control skeletal muscle ( n = 8; P < 0.05). There was no significant difference in the abundance of IR, IRS-1, or the p85 regulatory subunit of PI 3K in PCOS ( n = 14) compared with control ( n = 12) muscle. The abundance of IRS-2 was significantly increased ( P < 0.05) in PCOS skeletal muscle, suggesting a compensatory change. We conclude that there is a physiologically relevant defect in insulin receptor signaling in PCOS that is independent of obesity and type 2 diabetes mellitus.

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Crossref · 10.1152/ajpendo.2001.281.2.e392

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Authors
Dunaif, A., Wu, X., Lee, A., & Diamanti-Kandarakis, E.
Affiliations
  • Brigham and Women's Hospital (US)
  • Section of Diabetes and Metabolism, Department of Medicine, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
Venue
American Journal of Physiology-Endocrinology and Metabolism
Published
2001-08-01
Volume
281
Issue
2
Pages
E392-E399
ISSN
  • 0193-1849 (ISSN-L)
  • 1522-1555
OpenAlex
W1888335775
Cited by
337
References
41
Citations by year
2026: 7 · 2025: 4 · 2024: 8 · 2023: 12 · 2022: 12 · 2021: 16 · 2020: 10 · 2019: 12 · 2018: 12 · 2017: 9 · 2016: 8 · 2015: 20 · 2014: 19 · 2013: 13 · 2012: 15
FWCI
11.14
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Endocrinology and Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
polycystic ovary syndrome, insulin resistance, insulin receptor signaling, IRS-1, insulin receptor substrate 2, phosphatidylinositol 3-kinase, hyperinsulinemic-euglycemic clamp
MeSH terms
Adult, Biopsy, Blood Glucose, Chromatography, Thin Layer, Female, Glucose, Humans, Insulin, Insulin Resistance, Phosphoproteins, Polycystic Ovary Syndrome, Receptor, Insulin, RNA, Messenger, Glucose Clamp Technique, Signal Transduction, Body Mass Index, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Reverse Transcriptase Polymerase Chain Reaction, Intracellular Signaling Peptides and Proteins, Insulin Receptor Substrate Proteins

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