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Progestagenic effects of tibolone are target gene-specific in human endometrial cells

Wei Zhang1, James Mazella, Helenius J Kloosterboer

  • 1Department of Obstetrics/Gynecology and Reproductive Medicine, SUNY-Stony Brook, Stony Brook, New York 11794, USA.

Journal of the Society for Gynecologic Investigation
|August 2, 2006
PubMed
Abstract

Insights

Tibolone and its metabolite Delta4-tibolone show progestagenic effects in endometrial glandular cells, inducing specific genes. Effects were weaker in stromal cells, suggesting potential benefits for endometrial quiescence.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Gynecology

Background:

  • Tibolone (Tib) has known tissue-specific estrogenic activities.
  • Tibolone also exhibits progestagenic activities, which are not fully characterized.
  • Understanding these progestagenic actions is crucial for evaluating Tibolone's therapeutic potential.

Purpose of the Study:

  • To investigate the progestagenic effects of Tibolone and its metabolites.
  • To examine the regulation of key progestin-responsive genes in human endometrial cells.
  • To compare the activity of Tibolone in glandular versus stromal endometrial cells.

Main Methods:

  • Isolation of human endometrial glandular and stromal cells.
  • Incubation of cells with Tibolone and its metabolites.
  • Quantification of target gene mRNA using real-time PCR, including 17betaHSD, SULT1E1, PRL, and IGFBP1.

Main Results:

  • Tibolone and Delta4-tibolone significantly increased 17betaHSD and SULT1E1 mRNA in glandular cells.
  • Tibolone and Delta4-tibolone weakly increased PRL mRNA in stromal cells, with minimal effect on IGFBP1 mRNA.
  • The anti-progestin RU486 reversed the induction of SULT1E1 and PRL, confirming progestagenic activity. The metabolite 3betaOHTib also showed progestagenic effects.

Conclusions:

  • Tibolone and Delta4-tibolone demonstrate clear progestagenic effects in endometrial glandular cells.
  • Progestagenic response in endometrial stromal cells is weaker compared to glandular cells.
  • The distinct cellular responses suggest Tibolone may help maintain endometrial quiescence.

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