Cited by 256Endometriosis Research and TreatmentEstrogen and related hormone effectsEctopic Pregnancy Diagnosis and Management

Aromatase: a key molecule in the pathophysiology of endometriosis and a therapeutic target

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Zeitoun, Khaled M, Bulun, Serdar E·1999·Fertility and Sterility

Abstract

Objective To provide a clinically useful model illustrating the molecular aberrations affecting estrogen biosynthesis and metabolism in endometriosis and to discuss the therapeutic role of aromatase inhibitors.Design Literature review.Result(s) Several molecular aberrations were found in endometriotic lesions (in contrast to eutopic endometrium) that favor increased local concentrations of E2. Endometriotic stromal cells aberrantly express aromatase, which converts C19, steroids to estrogens. Aromatase activity in these cells is stimulated by prostaglandin (PG)E2. Estrogen stimulates cyclooxygenase-2, giving rise to increased PGE2 formation. Thus, this positive feedback loop produces increasing quantities of E2 and PGE2 in endometriosis. The lack of aromatase expression in eutopic endometrium is maintained by binding of an inhibitory transcription factor, COUP-TF, to the aromatase promoter. In endometriosis, however, an aberrantly expressed factor, SF-1, displaces COUP-TF to bind to this same promoter and activates aromatase expression and thus local estrogen biosynthesis. Additionally, endometriotic glandular cells are deficient in 17beta-hydroxysteroid dehydrogenase type 2, which converts E2 to estrone in the eutopic endometrium in response to P. Deficiency of this enzyme in endometriosis impairs the inactivation of E2 and may be a consequence of insensitivity to P.Conclusion(s) Molecular aberrations that increase local E2 concentrations may be important in the etiology of endometriosis. These molecules may be targeted to develop novel therapeutic strategies. The clinical relevance of aromatase expression in endometriosis was shown recently by the successful treatment of an unusually aggressive case of postmenopausal endometriosis with use of an aromatase inhibitor.

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Crossref · 10.1016/s0015-0282(99)00393-3

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Authors
Zeitoun, K. M., & Bulun, S. E.
Affiliations
The University of Texas Southwestern Medical Center (US)
Corresponding author
Bulun, Serdar E
Venue
Fertility and Sterility
Publisher
Elsevier BV
Published
1999-12
Volume
72
Issue
6
Pages
961-969
ISSN
0015-0282 (ISSN-L)
OpenAlex
W2170554336
Cited by
256
References
96
Citations by year
2026: 6 · 2025: 3 · 2024: 6 · 2023: 9 · 2022: 8 · 2021: 11 · 2020: 9 · 2019: 8 · 2018: 5 · 2017: 10 · 2016: 1 · 2015: 10 · 2014: 11 · 2013: 7 · 2012: 9
FWCI
1.96
Type
journal article
Language
en
Open access
Locations
  • Fertility and Sterility (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (CA-67167)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Endometriosis Research and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Ectopic Pregnancy Diagnosis and Management
Keywords
endometriosis, aromatase, estrogen synthesis, aromatase inhibitors, prostaglandin E2, cyclooxygenase-2, COUP-TF, SF-1, 17β-hydroxysteroid dehydrogenase type 2, estrone, endometriotic stromal cells, postmenopausal endometriosis, endometriosis pathophysiology
MeSH terms
Aromatase, Endometriosis, Endometrium, Enzyme Inhibitors, Epithelial Cells, Estrogens, Female, Humans, Gene Expression Regulation, Enzymologic, Stromal Cells, Aromatase Inhibitors

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