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TGFbeta regulated gene expression by Smads and Sp1/KLF-like transcription factors in cancer

Volker Ellenrieder1

  • 1Signal Transduction Laboratory, Internal Medicine, Department of Gastroenterology and Endocrinology, University of Marburg, Marburg, Germany. ellenrie@med.unimarburg.de

Anticancer Research
|July 18, 2008
PubMed

Insights

Transforming growth factor beta (TGFbeta) regulates cell functions via gene expression. New Sp1/KLF-like transcription factors (KLF10, KLF11) are key to TGFbeta

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Transforming growth factor beta (TGFbeta) is a crucial regulator of cellular functions, including gene expression, cell cycle control, and differentiation.
  • TGFbeta signaling pathways, both Smad-dependent and Smad-independent, are initiated by receptor binding and influence cellular responses.
  • Dysregulation of TGFbeta signaling is implicated in carcinogenesis, where tumor cells often exhibit resistance to its inhibitory effects and promote proliferation and invasion.

Purpose of the Study:

  • To summarize current knowledge on the roles of Sp1/KLF-like transcription factors in TGFbeta-mediated gene regulation.
  • To elucidate the involvement of Sp1/KLF-like proteins in both Smad-dependent and Smad-independent pathways initiated by TGFbeta.
  • To highlight the significance of these transcription factors in TGFbeta-controlled cell growth and differentiation.

Main Methods:

  • Review and summarization of existing literature on TGFbeta signaling pathways.
  • Analysis of studies characterizing Smad-mediated and Smad-independent transcriptional processes regulated by TGFbeta.
  • Identification and focus on novel TGFbeta-inducible Sp1/KLF-like transcription factors (KLF10 and KLF11).

Main Results:

  • TGFbeta controls normal epithelial cell cytostasis by repressing c-Myc and inducing cell cycle inhibitors p15(INK4b) and p21(Cip1).
  • Tumor cells often lose TGFbeta responsiveness, leading to activation of pro-proliferative and invasive genes.
  • KLF10 and KLF11 have been identified as novel TGFbeta-inducible Sp1/KLF-like transcription factors with significant roles in TGFbeta-mediated cell growth control and differentiation.

Conclusions:

  • Sp1/KLF-like proteins, including KLF10 and KLF11, play critical roles in TGFbeta signaling.
  • These transcription factors are involved in both Smad-dependent and Smad-independent gene regulation by TGFbeta.
  • Understanding the function of Sp1/KLF-like proteins is essential for comprehending TGFbeta's control over cell growth, differentiation, and its implications in cancer.

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