Differences in the estrogen content of breast adipose tissue in women by menopausal status and hormone use.

Journal Article

OBJECTIVE: To determine the levels of free estrone (E1) and estradiol (E2) in breast adipocytes of premenopausal women, premenopausal women using oral contraceptives (OCs), postmenopausal women, and postmenopausal women using estrogen replacement therapy (ERT). METHODS: Breast adipose tissue was obtained from 36 premenopausal and 29 postmenopausal women, and adipocytes were separated from stromal and epithelial cells through collagenase digestion and centrifugation. Oil was rendered from adipocytes, and E1 and E2 levels were measured by specific radioimmunoassays after extraction with methanol-water. RESULTS: Estrone and E2 levels were approximately 2.4- and 7.8-fold higher, respectively, in premenopausal women than in postmenopausal women. In premenopausal women, E1 and E2 correlated with the time since last menses (R2 = .55 and .62, respectively), whereas in postmenopausal women, E1 and E2 correlated with body mass index (BMI) (r = .48 and .52, respectively). Estrone levels were always greater than E2 levels in adipocytes, with the E1/E2 ratio being 2.7-fold higher in postmenopausal women than in premenopausal women. The use of OCs decreased E1 and E2 levels in premenopausal women, and ERT increased levels in postmenopausal women. CONCLUSION: Free estrogen in breast adipocytes is characterized by E1 dominance, with levels in premenopausal women correlating with the menstrual cycle and levels in postmenopausal women correlating with BMI.

Full Text

Duke Authors

Cited Authors

  • O'Brien, SN; Anandjiwala, J; Price, TM

Published Date

  • August 1997

Published In

Volume / Issue

  • 90 / 2

Start / End Page

  • 244 - 248

PubMed ID

  • 9241302

International Standard Serial Number (ISSN)

  • 0029-7844

Digital Object Identifier (DOI)

  • 10.1016/S0029-7844(97)00212-3

Language

  • eng

Conference Location

  • United States