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The expression and activity of D-type cyclins in F9 embryonal carcinoma cells: modulation of growth by RXR-selective

Y Li1, M A Glozak, S M Smith

  • 1Department of Biology, University of South Florida, Tampa, 4202 E. Fowler Avenue, 33620, USA.

Experimental Cell Research
|December 10, 1999
PubMed

Insights

Retinoids, including all-trans-retinoic acid and RXR agonists, inhibit F9 embryonal carcinoma cell proliferation by regulating cell cycle genes like cyclins and Cdk4 activity. This occurs with or without inducing terminal differentiation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Malignant F9 embryonal carcinoma cells differentiate into benign parietal endoderm upon all-trans-retinoic acid (ATRA) treatment, accompanied by reduced growth.
  • Understanding the cell cycle regulation mechanisms during this differentiation is crucial for cancer therapy development.

Purpose of the Study:

  • To investigate the role of cyclins D1, D2, D3, and their associated kinase activity in ATRA-induced F9 cell differentiation.
  • To determine if retinoid X receptor (RXR) agonists can inhibit F9 cell proliferation and modulate cell cycle regulators independently of terminal differentiation.

Main Methods:

  • Analysis of cyclin D1, D2, D3, and p27 mRNA expression during ATRA-induced differentiation.
  • Assay of Cdk4-associated kinase activity in undifferentiated and differentiated F9 cells.
  • Treatment of F9 cells with RXR-selective agonists (LG100153, LG100268) and assessment of cell growth, differentiation markers, cell cycle phase distribution, and Cdk4 activity.

Main Results:

  • ATRA treatment decreased cyclin D1 and D3 mRNA, increased cyclin D2 and p27 mRNA, and reduced Cdk4-associated kinase activity by 50%.
  • RXR agonists inhibited F9 cell growth and increased G1 phase cell population without inducing overt terminal differentiation.
  • RXR activation increased cyclin D2 and D3 levels but decreased Cdk4-dependent kinase activity.

Conclusions:

  • Retinoids can directly inhibit cell proliferation and regulate Cdk4-dependent kinase activity.
  • RXR agonists offer a potential therapeutic strategy by inhibiting cancer cell growth without necessarily inducing terminal differentiation, suggesting distinct mechanisms of action compared to ATRA.

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