Cited by 1,603Ovarian function and disordersReproductive Biology and FertilityAdrenal Hormones and Disorders

The pathogenesis of polycystic ovary syndrome (PCOS): the hypothesis of PCOS as functional ovarian hyperandrogenism revisited

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Rosenfield, Robert L., Ehrmann, David A.·2016·Endocrine Reviews

Abstract

Polycystic ovary syndrome (PCOS) was hypothesized to result from functional ovarian hyperandrogenism (FOH) due to dysregulation of androgen secretion in 1989 -1995.Subsequent studies have supported and amplified this hypothesis.When defined as otherwise unexplained hyperandrogenic oligoanovulation, two-thirds of PCOS cases have functionally typical FOH, characterized by 17-hydroxyprogesterone hyperresponsiveness to gonadotropin stimulation.Two-thirds of the remaining PCOS have FOH detectable by testosterone elevation after suppression of adrenal androgen production.About 3% of PCOS have a related isolated functional adrenal hyperandrogenism.The remaining PCOS cases are mild and lack evidence of steroid secretory abnormalities; most of these are obese, which we postulate to account for their atypical PCOS.Approximately half of normal women with polycystic ovarian morphology (PCOM) have subclinical FOH-related steroidogenic defects.Theca cells from polycystic ovaries of classic PCOS patients in long-term culture have an intrinsic steroidogenic dysregulation that can account for the steroidogenic abnormalities typical of FOH.These cells overexpress most steroidogenic enzymes, particularly cytochrome P450c17.Overexpression of a protein identified by genome-wide association screening, differentially expressed in normal and neoplastic development 1A.V2, in normal theca cells has reproduced this PCOS phenotype in vitro.A metabolic syndrome of obesity-related and/or intrinsic insulin resistance occurs in about half of PCOS patients, and the compensatory hyperinsulinism has tissue-selective effects, which include aggravation of hyperandrogenism.PCOS seems to arise as a complex trait that results from the interaction of diverse genetic and environmental factors.Heritable factors include PCOM, hyperandrogenemia, insulin resistance, and insulin secretory defects.Environmental factors include prenatal androgen exposure and poor fetal growth, whereas acquired obesity is a major postnatal factor.The variety of pathways involved and lack of a common thread attests to the multifactorial nature and heterogeneity of the syndrome.Further research into the fundamental basis of the disorder will be necessary to optimally correct androgen levels, ovulation, and metabolic homeostasis.(Endocrine Reviews 37: 467-520, 2016) I. Historical Perspective II.Definition of Polycystic Ovary Syndrome (PCOS) III.Normal Androgen Physiology A. Biochemical and molecular overview of steroidogenesis B. Regulation of ovarian function 1. Regulation of gonadotropin secretion 2. Regulation of ovarian steroidogenesis a. Homologous desensitization to LH b.Modulation of LH action 3. Folliculogenesis and its regulation C. Regulation of adrenal androgen production D. Regulation of peripheral androgen production E. Summary of normal androgen physiology IV.Source of Androgen Excess in PCOS A. Testing to determine the source of androgen in PCOS B. Functional Ovarian Hyperandrogenism (FOH) in PCOS 1. Spectrum of ovarian androgenic function in PCOS: Typical and atypical FOH 2. Spectrum of ovarian androgenic function in asymptomatic women with polycystic ovarian morphology (PCOM)

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  • Elevated ovarian androgen production is a core feature of PCOS and results in PCOS symptoms including hair loss, acne, oily skin, and accumulation of abdominal fat.

    “Elevated ovarian androgen production is a core feature of PCOS and results in PCOS symptoms including hair loss, acne, oily skin, and accumulation of abdominal fat (Rosenfield & Ehrmann, 2016).”

    From Endometriosis and polycystic ovary syndrome are diametric disorders (2021) · cites this paper as Rosenfield & Ehrmann, 2016

    The paper’s A B section calls functional ovarian hyperandrogenism a common denominator of PCOS and says it can account for characteristic features including hirsutism. The Abstract also lists acne among features variably accompanying PCOS. The cited passages do not establish hair loss or oily skin as effects of elevated ovarian androgen production, and the obesity and insulin-resistance section treats abdominal fat accumulation as more complex than a direct consequence of ovarian androgens. Page numbers were not provided in our copy. (LLM, conf=0.87)

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  • Dietary and environmental factors have an impact on developmental programming of susceptible gene variants in women with PCOS.

    “Dietary and environmental factors are hypothesized to have an impact on developmental programming of susceptible gene variants in women with PCOS [41,42,43].”

    From Polycystic Ovary Syndrome: An Evolutionary Adaptation to Lifestyle and the Environment (2022) · cites this paper as [43]

    The Intrauterine environment section says developmental environmental insults can alter the epigenome and gene expression, and identifies intrauterine nutrition as a PCOS risk factor. The Summary describes PCOS as an interaction of genetic and environmental factors. The paper does not say that dietary or environmental factors program gene variants themselves; it describes programming of susceptibility and changes in gene expression. (LLM, conf=0.83)

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  • Insulin resistance is not the leading cause of obesity, although obesity worsens the insulin resistance of PCOS and hyperandrogenemia.

    “Insulin resistance (IR) is not the leading cause of obesity, although obesity really does worsen the insulin resistance of polycystic ovarian syndrome (PCOS) and hyperandrogenemia.”

    From Nutritional and herbal interventions for polycystic ovary syndrome (PCOS): a comprehensive review of dietary approaches, macronutrient impact, and herbal medicine in management (2025) · cites this paper as [63]

    The “Obesity and insulin resistance” section (page unavailable) says obesity seems to worsen PCOS hyperandrogenism by exaggerating insulin resistance. It does not establish that insulin resistance is not a leading cause of obesity; instead, it describes insulin-resistant hyperinsulinism as a likely major factor in excessive fat formation in PCOS. The citing sentence also states the obesity effect more firmly than the source does. (LLM, conf=0.85)

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  • This research has resulted in a proposed two hit hypothesis for the development of PCOS phenotypes.

    “This research has resulted in a proposed “two hit” hypothesis for the development of PCOS phenotypes [43,45].”
  • Hyperinsulinism can appear due to insulin resistance and be caused by production of metabolically active chemicals by visceral adipose tissue.

    “Hyperinsulinism can appear due to insulin resistance and be caused by the production of chemical substances that are metabolically active by the visceral adipose tissue [63].”

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Cites

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Research works printed but not linked: 7

  1. Chang RJ, Nakamura RM, Judd HL, Kaplan SA. Insulin resistance in nonobese patients with polycystic ovary dis- ease. J Clin Endocrinol Metab. 1983;57:356 -359.
  2. Dunaif A, Givens J, Haseltine F, Merriam G, eds. Polycys- tic Ovary Syndrome. Cambridge, MA: Blackwell Scientific Publications; 1992:83-110.
  3. Zawadzki J, Dunaif A. Diagnostic criteria for polycystic ovary syndrome: towards a rational approach. In: Dunaif A, Givens J, Haseltine F, Merriam G, eds. Polycystic Ovary Syndrome. Cambridge, MA: Blackwell Scientific Publica- tions; 1992:377-384.
  4. Johnson T, Kaplan L, Ouyang P, Rizza R. National Insti- tutes of Health evidence-based methodology workshop on polycystic ovary syndrome (PCOS). NIH EbMW Report. 2013. Available from https://prevention.nih.gov/pro- grams-events/pathways-to-prevention/previous-work- shops/pcos/workshop-resources. Bethesda, MD: National Institutes of Health; 1-14.
  5. Rosenfield RL. Clinical practice. Hirsutism [comment ap- pears in N Engl J Med. 2006;354(14):1533-1535; author reply 1533-1535].
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  7. Chang RJ, Cook-Andersen H. Disordered follicle develop- ment. Mol Cell Endocrinol. 2013;373:51-60.

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Authors
Rosenfield, R. L., & Ehrmann, D. A.
Affiliations
University of Chicago (US)
Venue
Endocrine Reviews
Published
2016-07-26
Volume
37
Issue
5
Pages
467-520
ISSN
  • 0163-769X (ISSN-L)
  • 1945-7189
OpenAlex
W2528009933
Cited by
1,603
References
552
Citations by year
2026: 201 · 2025: 234 · 2024: 207 · 2023: 229 · 2022: 224 · 2021: 191 · 2020: 137 · 2019: 87 · 2018: 56 · 2017: 33 · 2016: 2 · 2015: 1
FWCI
8.52
Type
journal article
Language
en
Open access
Locations
  • Endocrine Reviews (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Chicago (UL1 RR024999)
  • National Institutes of Health (P60 DK20595)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P60DK020595, P30DK020595)
  • National Institute of Child Health and Human Development
  • National Center for Research Resources (RR-00055, UL1RR024999, M01RR000055)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (P50HD057796)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Ovarian function and disorders
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Biology and Fertility
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
Keywords
polycystic ovary syndrome, androgen secretion, theca cells, P450c17, insulin resistance, hyperinsulinemia, metabolic syndrome, obesity, prenatal androgen exposure, fetal growth restriction, hyperandrogenemia
MeSH terms
Androgens, Animals, Female, Humans, Hyperinsulinism, Insulin Resistance, Ovary, Polycystic Ovary Syndrome, Hyperandrogenism, Genome-Wide Association Study

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