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Pathogenesis of Reproductive and Metabolic PCOS Traits in a Mouse Model.

Valentina Rodriguez Paris1, Melissa C Edwards1,2, Ali Aflatounian1

  • 1Fertility and Research Centre, School of Women's & Children's Health, University of New South Wales Sydney, NSW 2052, Australia.

Journal of the Endocrine Society
|May 31, 2021
PubMed
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Polycystic ovary syndrome (PCOS) development involves early reproductive changes like acyclicity and increased body weight. Metabolic issues such as adiposity and dyslipidemia appear later in PCOS progression.

Area of Science:

  • Reproductive endocrinology and metabolism
  • Animal models of human disease

Background:

  • Polycystic ovary syndrome (PCOS) is a common endocrine disorder with unclear etiology and symptom-based management.
  • Understanding PCOS pathogenesis is crucial for early detection and novel therapeutic strategies.
  • Hyperandrogenism is a key feature, suggesting androgen-driven mechanisms in PCOS development.

Purpose of the Study:

  • To investigate the temporal sequence of PCOS trait development.
  • To characterize the emergence of reproductive and metabolic features in a dihydrotestosterone (DHT)-induced PCOS mouse model.

Main Methods:

  • A dihydrotestosterone (DHT)-induced PCOS mouse model was utilized.
  • Mice were exposed to DHT for 2, 4, and 8 weeks.
  • Reproductive parameters (acyclicity, anovulation, follicle health), body weight, adiposity, and metabolic markers (cholesterol, glucose, triglycerides, liver enzymes) were assessed.
Keywords:
PCOSanimal modelhyperandrogenismpolycystic ovary syndrome

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Main Results:

  • Early DHT exposure (2 weeks) induced key reproductive PCOS features: acyclicity, anovulation, multifollicular ovaries, and decreased large antral follicle health.
  • Increased body weight was observed early, while visceral adiposity emerged by 8 weeks.
  • Circulating cholesterol increased after 2 weeks; fasting glucose was affected, but triglycerides, liver enzymes, and hepatic steatosis were not significantly altered by 8 weeks.

Conclusions:

  • In this PCOS mouse model, acyclicity, anovulation, and increased body weight are early indicators of PCOS development.
  • Metabolic complications like adiposity, impaired glucose tolerance, and dyslipidemia manifest as later-developing features.
  • These findings suggest body weight could be an early diagnostic criterion for PCOS.