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Tomoregulin-1 (TMEFF1) inhibits nodal signaling through direct binding to the nodal coreceptor Cripto

Paul W Harms1, Chenbei Chang

  • 1Department of Cell Biology, The University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.

Genes & Development
|October 18, 2003
PubMed

Insights

Tomoregulin-1 (TMEFF1) selectively inhibits nodal signaling by binding to the Cripto co-receptor in Xenopus embryos. This novel mechanism blocks nodal pathway activation, offering new insights into developmental signaling regulation.

Area of Science:

  • Developmental biology
  • Molecular signaling pathways
  • Protein-protein interactions

Background:

  • Transforming growth factor beta (TGF-beta) signaling is crucial for embryonic development and adult homeostasis.
  • Tomoregulin-1 (TMEFF1), a transmembrane protein, was previously shown to selectively inhibit nodal signaling in early Xenopus embryos.
  • Understanding the precise molecular mechanisms of nodal pathway regulation is essential for deciphering developmental processes.

Purpose of the Study:

  • To elucidate the molecular mechanism by which tomoregulin-1 (TMEFF1) inhibits nodal signaling.
  • To investigate the interaction between TMEFF1 and components of the nodal signaling pathway, specifically Cripto and ALK4.
  • To determine if Cripto acts as a direct mediator for TMEFF1's inhibitory effect on nodal signaling.

Main Methods:

  • Co-immunoprecipitation assays were employed to assess protein-protein interactions between TMEFF1, nodal, Cripto, and ALK4.
  • Xenopus ectodermal explants were utilized to study the functional effects of TMEFF1 on nodal signaling.
  • Rescue experiments using wild-type and mutant forms of Cripto were performed to validate the role of Cripto in TMEFF1-mediated inhibition.

Main Results:

  • TMEFF1 was found to bind to the nodal co-receptor Cripto but not to nodal itself or the ALK4 receptor.
  • Inhibition of nodal signaling by TMEFF1 in Xenopus ectodermal explants could be rescued by wild-type Cripto, but not by mutant forms.
  • The Cripto-FRL1-Cryptic (CFC) domain of Cripto, critical for ALK4 binding, was also essential for TMEFF1 interaction.

Conclusions:

  • Nodal signaling can be regulated through a novel mechanism involving the blockade of the Cripto co-receptor by TMEFF1.
  • TMEFF1's interaction with Cripto, rather than direct interaction with nodal or ALK4, underlies its inhibitory function.
  • These findings provide new insights into the intricate regulation of TGF-beta superfamily signaling during embryonic development.

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