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Transforming growth factor β inhibits bone morphogenetic protein-induced transcription through novel phosphorylated

Eva Grönroos1, Isabel J Kingston, Anassuya Ramachandran

  • 1Laboratory of Developmental Signalling, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, London, United Kingdom.

Molecular and Cellular Biology
|May 23, 2012
PubMed

Insights

Transforming growth factor beta (TGF-β) inhibits bone morphogenetic protein (BMP) signaling by forming complexes with Smad3. This interaction is crucial for regulating gene transcription in response to TGF-β.

Area of Science:

  • Cellular biology
  • Molecular signaling pathways
  • Gene transcription regulation

Background:

  • Cells integrate multiple extracellular signals for appropriate responses.
  • Transforming growth factor beta (TGF-β) superfamily members, including bone morphogenetic protein (BMP) and TGF-β, play critical roles in cellular communication.
  • Understanding the interplay between these signaling pathways is essential for deciphering cellular behavior.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the interplay between TGF-β and BMP signaling pathways.
  • To elucidate how TGF-β influences BMP-induced transcription.
  • To identify the key molecular players involved in this cross-talk.

Main Methods:

  • Utilized BMP-responsive reporter genes and endogenous BMP target genes in multiple cell lines.
  • Investigated the role of TGF-β type I receptor ALK5 and Smad proteins (Smad2, Smad3).
  • Performed in vitro and in vivo analyses of protein complex formation and DNA binding to BMP-responsive elements.

Main Results:

  • TGF-β potently inhibits BMP-induced transcription, affecting both reporter and endogenous genes.
  • This inhibition requires ALK5 and Smad3, but not Smad2, and is independent of new protein synthesis.
  • TGF-β induces complexes of phosphorylated Smad1/5 and Smad3, which bind BMP elements and mediate transcriptional repression.
  • Loss of Smad3 enables TGF-β to induce transcription via BMP-responsive elements.

Conclusions:

  • Smad3 is critical for mediating TGF-β's inhibitory effects on BMP signaling.
  • Smad3 plays a key role in restricting transcriptional output in response to TGF-β.
  • The findings reveal a novel mechanism of cross-regulation between TGF-β and BMP signaling pathways mediated by Smad3.

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