Cited by 196Estrogen and related hormone effectsBreast Cancer Treatment StudiesEffects and risks of endocrine disrupting chemicals

Effects of estrogen on breast cancer development: Role of estrogen receptor independent mechanisms

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Yue, Wei, Wang, Ji‐Ping, Li, Yuebai, Fan, Ping, Liu, Guijian, Zhang, Nan, Conaway, Mark, Wang, Hongkun +3 more·2010·International Journal of Cancer

Abstract

Development of breast cancer involves genetic factors as well as lifetime exposure to estrogen. The precise molecular mechanisms whereby estrogens influence breast tumor formation are poorly understood. While estrogen receptor α (ERα) is certainly involved, nonreceptor mediated effects of estradiol (E2) may also play an important role in facilitating breast tumor development. A “reductionist” strategy allowed us to examine the role of ERα independent effects of E2 on mammary tumor development in ERα knockout (ERKO) mice bearing the Wnt‐1 oncogene. Exogenous E2 “clamped” at early follicular and midluteal phase levels (i.e., 80 and 240 pg/ml) accelerated tumor formation in a dose‐related fashion in ERKO/Wnt‐1 animals (p = 0.0002). Reduction of endogenous E2 by oophorectomy (p < 0.001) or an aromatase inhibitor (AI) (p = 0.055) in intact ERKO/Wnt‐1 animals delayed tumorigenesis as further evidence for an ER‐independent effect. The effects of residual ERα or β were not involved since enhancement of tumor formation could not be blocked by the antiestrogen fulvestrant. 17α‐OH‐E2, a metabolizable but ER‐impeded analogue of E2 stimulated tumor development without measurable uterine stimulatory effects. Taken together, our results suggest that ER‐independent actions of E2 can influence breast tumor development in concert with ER dependent effects. These observations suggest 1 mechanism whereby AIs, which block E2 synthesis, would be more effective for breast cancer prevention than use of antiestrogens, which only block ER‐mediated effects.

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Crossref · 10.1002/ijc.25207

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  • E2 in breast tissue is not associated with protective metabolic effects, but rather has been linked to proliferative tumor growth.

    “E2 in breast tissue is not associated with protective metabolic effects, but rather has been linked to proliferative tumor growth (195).”

    From Metabolic impact of endogenously produced estrogens by adipose tissue in females and males across the lifespan (2025) · cites this paper as [195]

    The ERα-independent effects section (p. 3) reports that E2 increased tumor incidence in ERKO/Wnt-1 mice, supporting a link to tumor development. The paper does not assess whether E2 has protective metabolic effects in breast tissue, and its mammary-proliferation section (p. 3) reports that E2 did not stimulate lobule proliferation in this model. The claim therefore goes beyond the measured outcomes. (LLM, conf=0.86)

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  • Elevated aromatase expression in breast white adipose tissue increases local E2 production, which may contribute to estrogen receptor-positive breast cancer pathogenesis.

    “Elevated aromatase expression in breast WAT increases local E2 production, which may contribute to estrogen receptor-positive (ER+) breast cancer pathogenesis (135, 195, 196).”

    From Metabolic impact of endogenously produced estrogens by adipose tissue in females and males across the lifespan (2025) · cites this paper as [195]

    The paper states that aromatase inhibitors block E2 synthesis (p. 1) and that estrogen can contribute to breast cancer development through ER-mediated pathways (Discussion, p. 6). It does not establish the claimed increase in aromatase expression in breast white adipose tissue or show that this increases local E2 production; its own experiments focus on ER-independent tumor development in mice. (LLM, conf=0.83)

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Research works printed but not linked: 5

  1. [8]8. and the risk of invasive breast cancer. Arch Intern Med 2006;166:1027-32.
  2. [24]24. estrogen-deprived human breast cancer cells. Endocrinology 1998;139:4164-74.
  3. [42]42. Shim W-S, Conaway M, Shigeru M, Yue W, Wang J-P, Kumar R, Santen RJ. Estradiol hypersensitivity and mitogenactivated protein kinase expression in longterm estrogen deprived human breast cancer cells in vivo. Endocrinology 2000; 141:396-405.
  4. [45]45. Key T, Appleby P, Barnes I, Reeves G, Group. EHaBCC. Endogenous sex hormones and breast cancer in postmenopausal women: reanalysis of nine prospective studies. J Natl Cancer Inst 2002;94:606-16.
  5. [56]56. Yager JD. Endogenous estrogens as carcinogens through metabolic activation. J Natl Cancer Inst Monogr 2000;27:67-73.

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Authors
Yue, W., Wang, J., Li, Y., Fan, P., Liu, G., Zhang, N., Conaway, M., Wang, H., Korach, K. S., Bocchinfuso, W., & Santen, R.
Affiliations
  • University of Virginia Health System (US)
  • National Institutes of Health (US)
Corresponding author
Yue, Wei
Venue
International Journal of Cancer
Publisher
Wiley
Published
2010-08-20
Volume
127
Issue
8
Pages
1748-1757
ISSN
  • 0020-7136 (ISSN-L)
  • 1097-0215
OpenAlex
W2035185970
Cited by
196
References
73
Citations by year
2026: 2 · 2025: 26 · 2024: 16 · 2023: 30 · 2022: 19 · 2021: 23 · 2020: 21 · 2019: 10 · 2018: 10 · 2017: 7 · 2016: 3 · 2015: 5 · 2014: 6 · 2013: 7 · 2012: 9
FWCI
3.24
Type
journal article
Language
en
Open access
Locations
  • International Journal of Cancer (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Environmental Health Sciences (Z01ES070065)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Breast Cancer Treatment Studies
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Effects and risks of endocrine disrupting chemicals
Keywords
breast cancer, estrogen receptor alpha, estrogen receptor beta, estradiol, ER knockout mice, aromatase inhibitors, oophorectomy, fulvestrant, breast cancer prevention, antiestrogens
MeSH terms
Fulvestrant, Letrozole, Animals, Antineoplastic Agents, Dose-Response Relationship, Drug, Estradiol, Estrogen Antagonists, Female, Humans, Mammary Neoplasms, Experimental, Mice, Transgenic, Nitriles, Ovariectomy, Triazoles, Mice, Knockout, Estrogen Receptor alpha, Cell Proliferation, Wnt1 Protein, Mice

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