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Crosstalk mechanisms between the mitogen-activated protein kinase pathways and Smad signaling downstream of TGF-beta:

Delphine Javelaud1, Alain Mauviel

  • 1INSERM U697, Pavillon Bazin, Hôpital Saint-Louis, 1 Avenue Claude Vellefaux, Paris 75010, France.

Oncogene
|August 27, 2005
PubMed

Insights

Transforming growth factor-beta (TGF-beta) signaling involves Smad proteins, but its outcomes are modulated by other pathways like mitogen-activated protein kinases (MAPKs). This review explores how MAPK interactions with Smad signaling impact cell fate, particularly in carcinogenesis.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Cancer research

Background:

  • Transforming growth factor-beta (TGF-beta) superfamily signals through receptor complexes, activating Smad proteins.
  • Activated Smads translocate to the nucleus to regulate gene expression, forming the TGF-beta/Smad pathway.
  • TGF-beta responses are cell-type specific, influenced by crosstalk with other intracellular signaling mechanisms.

Purpose of the Study:

  • To review how mitogen-activated protein kinases (MAPKs) modulate Smad activation by TGF-beta.
  • To examine the cross-signaling mechanisms between Smad and MAPK pathways.
  • To understand the impact of this crosstalk on cell fate in carcinogenesis.

Main Methods:

  • Literature review focusing on Smad and MAPK signaling pathways.
  • Analysis of molecular mechanisms governing Smad and MAPK interactions.
  • Integration of findings related to cell fate determination in cancer.

Main Results:

  • MAPKs regulate Smad activity, influencing the TGF-beta/Smad pathway's outcome.
  • Activated Smads interact with transcriptional cofactors, which are themselves regulated by diverse signaling.
  • Negative feedback loops involving inhibitory Smads also modulate pathway activity.

Conclusions:

  • Cross-talk between TGF-beta/Smad and MAPK pathways significantly impacts cellular responses.
  • Understanding these complex interactions is crucial for elucidating mechanisms of carcinogenesis.
  • Targeting these signaling crosstalks may offer therapeutic strategies for cancer treatment.

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