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RSK in tumorigenesis: connections to steroid signaling

T S Karin Eisinger-Mathason1, Josefa Andrade, Deborah A Lannigan

  • 1Department of Microbiology, University of Virginia, Charlottesville, VA 22908, USA.

Steroids
|January 5, 2010
PubMed

Insights

Ribosomal S6 Kinases (RSK) are crucial in cancer, mediating steroid hormone effects on cell growth and survival. Targeting RSK offers a promising therapeutic strategy for various cancers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Endocrinology

Background:

  • The Ser/Thr kinase family, RSK, is implicated in hormone-dependent and -independent cancers.
  • RSKs' role as mediators of steroid hormone non-genomic effects and facilitators of steroid receptor-mediated gene expression is under-explored.
  • Steroid hormone signaling can activate the MEK/ERK/RSK pathway, regulating proliferation and survival in transformed cells.

Purpose of the Study:

  • To explore the mechanisms of RSK in tumorigenesis.
  • To investigate the relationship between RSK and steroid hormone signaling.
  • To highlight RSKs as potential anti-cancer therapeutic targets.

Main Methods:

  • Literature review of existing studies on RSK, steroid hormones, and cancer.
  • Analysis of mechanisms linking RSK to cell proliferation and survival.
  • Examination of RSK's role in regulating key proteins like cyclin D1 and mitochondrial integrity.

Main Results:

  • RSK enhances proliferation in breast and prostate cancer cells by controlling cyclin D1 levels.
  • RSK influences apoptosis in lung and other tumors via estrogen-mediated regulation of mitochondrial integrity.
  • RSK activation is a key mechanism in steroid hormone-mediated proliferation and survival.

Conclusions:

  • RSKs are significant mediators of steroid hormone signaling in cancer.
  • RSKs represent important anti-cancer therapeutic targets across diverse transformed tissues.
  • RSK-specific inhibitors are expected to advance research and clinical applications.

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