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Krüppel-like factor 4 mediates anti-proliferative effects of progesterone with G₀/G₁ arrest in human endometrial

Y Shimizu1, T Takeuchi, S Mita

  • 1Pharmaceutical Research Center, Mochida Pharmaceutical Co., Ltd., 722 Jimba-aza-Uenohara, Gotemba, Shizuoka 412-8524, Japan. shimizuy@mochida.co.jp

Journal of Endocrinological Investigation
|May 19, 2010
PubMed

Insights

Progesterone receptor (PR) activation inhibits endometrial cell proliferation by increasing Krüppel-like factor 4 (KLF4) expression. This leads to decreased cyclin D1 and cell cycle arrest, revealing KLF4 as a key PR target.

Area of Science:

  • Reproductive biology
  • Molecular endocrinology
  • Cell cycle regulation

Background:

  • Progesterone receptor (PR) activation inhibits cell proliferation in reproductive tissues, but mechanisms are unclear.
  • Krüppel-like factor 4 (KLF4) induces cell cycle arrest in epithelial cells.
  • Understanding PR-mediated proliferation control is crucial for reproductive health.

Purpose of the Study:

  • To investigate if Krüppel-like factor 4 (KLF4) is a target of progesterone receptor (PR) activation in human endometrial epithelial cells.
  • To elucidate the molecular mechanisms by which PR regulates cell proliferation.

Main Methods:

  • Human endometrial epithelial cells were treated with PR agonists (progesterone, dienogest).
  • KLF4 and cyclin D1 mRNA expression levels were measured.
  • KLF4 knockdown was performed using small interfering RNA (siRNA).
  • KLF4's effect on cyclin D1 promoter activity was assessed via transactivation assays.

Main Results:

  • PR agonists increased KLF4 mRNA and decreased cyclin D1 mRNA, inducing G₀/G₁ cell cycle arrest.
  • KLF4 knockdown abolished the antiproliferative effects of PR agonists.
  • Forced KLF4 expression inhibited cyclin D1 promoter activity.

Conclusions:

  • PR agonists stimulate KLF4 expression, which subsequently suppresses cyclin D1, leading to inhibited cell proliferation in endometrial cells.
  • KLF4 is identified as a direct target of PR activation involved in cell cycle regulation within human reproductive tissues.

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