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Suppressor and oncogenic roles of transforming growth factor-beta and its signaling pathways in tumorigenesis

E Piek1, A B Roberts

  • 1Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, Bethesda, MD 20892-8395, USA.

Advances in Cancer Research
|October 23, 2001
PubMed

Insights

Transforming growth factor-beta (TGF-beta) plays a dual role in cancer, acting as both a tumor suppressor and promoter. Cancer cells often retain TGF-beta

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Transforming growth factor-beta (TGF-beta) has been recognized for its involvement in oncogenesis for nearly two decades.
  • TGF-beta exhibits complex, dual roles in cancer, functioning as both a tumor suppressor and a tumor promoter, contingent upon the carcinogenic stage and tumor cell responsiveness.
  • Alterations in TGF-beta signaling pathways are frequently observed in tumorigenesis, affecting ligand activation, receptor expression, and downstream signaling intermediates.

Purpose of the Study:

  • To elucidate the intricate mechanisms underlying the transition of TGF-beta's function from tumor suppression to tumor promotion during carcinogenesis.
  • To understand how dysregulation of TGF-beta signaling contributes to cancer progression.
  • To explore the interplay between TGF-beta, Smad, and mitogen-activated protein (MAP) kinase pathways in altered cellular responses.

Main Methods:

  • Review and synthesis of existing research on TGF-beta signaling in cancer.
  • Analysis of molecular mechanisms involving Smad and MAP kinase pathways.
  • Investigation of changes in gene expression and protein interactions modulating TGF-beta signaling.

Main Results:

  • Loss of sensitivity to TGF-beta's growth-inhibitory effects in tumor cells often involves selective inactivation of tumor suppressor functions.
  • Tumor cells may retain TGF-beta's tumor-promoting activities, particularly those mediated by crosstalk with MAP kinase pathways and AP-1.
  • Identification of Smad signaling pathways and their interactions with MAP kinase pathways provides insights into TGF-beta's dual role.

Conclusions:

  • Most tumor cells do not completely lose TGF-beta signaling but rather exploit its pro-tumorigenic functions while evading its suppressive effects.
  • The selective inactivation of TGF-beta's tumor suppressor activities, coupled with the retention of tumor-promoting functions via MAP kinase crosstalk, is a key mechanism in cancer progression.
  • Understanding these complex signaling dynamics is crucial for developing targeted cancer therapies.

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