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Updated: Mar 2, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
06:54

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

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TGF-beta signaling in mammary gland development and tumorigenesis

L M Wakefield1, E Piek, E P Böttinger

  • 1Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, Bethesda, Maryland, USA. wakefiel@dce41.nci.nih.gov

Journal of Mammary Gland Biology and Neoplasia
|July 27, 2001
PubMed

Insights

Transforming growth factor-beta (TGF-beta) signals via serine-threonine kinases and Smad proteins, influencing cell responses. TGF-beta

Area of Science:

  • Cell signaling pathways
  • Molecular biology
  • Cancer research

Background:

  • Transforming growth factor-beta (TGF-beta) superfamily ligands utilize transmembrane receptor serine-threonine kinases for signaling.
  • This pathway involves Smad proteins, which translocate to the nucleus to regulate transcription.
  • TGF-beta can also activate the mitogen-activated protein kinase (MAPK) pathway, leading to diverse biological outcomes.

Purpose of the Study:

  • To explore the dual role of TGF-beta signaling in mammary gland tumor suppression and oncogenesis.
  • To investigate the reasons behind the lack of genetic inactivation of TGF-beta receptors and Smads in human breast cancer despite reduced receptor expression.

Main Methods:

  • Review of existing literature on TGF-beta signaling pathways.
  • Analysis of the interplay between Smad and MAPK pathways.
  • Discussion of genetic and expression data related to TGF-beta receptors and Smads in breast cancer.

Main Results:

  • TGF-beta signaling can activate both Smad and MAPK pathways, with biological responses varying based on pathway activation.
  • The Smad pathway acts as a central hub for cross-talk with other signaling pathways and protein interactions.
  • While TGF-beta exhibits tumor suppressor activity in the mammary gland, its receptors and Smads are not typically inactivated in human breast cancer.

Conclusions:

  • The complex signaling network of TGF-beta, involving Smad and MAPK pathways, contributes to its dual role in cancer.
  • Reduced TGF-beta receptor expression in breast cancer, rather than genetic inactivation, may be a key factor.
  • Further research is needed to fully elucidate the mechanisms underlying TGF-beta's context-dependent functions in breast cancer.

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