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The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
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An evolving web of signaling networks regulated by Cripto-1

Tadahiro Nagaoka1, Hideaki Karasawa, Nadia Pereira Castro

  • 1Tumor Growth Factor Section, Laboratory of Cancer Prevention, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.

Growth Factors (Chur, Switzerland)
|December 14, 2011
PubMed

Insights

Cripto-1 is crucial for embryonic development but absent in adults, except in stem cells. It is re-expressed in tumors, driving cancer growth by interacting with multiple signaling pathways.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cancer Biology

Background:

  • Cripto-1 (Growth Differentiation Factor 1) is an embryonic gene vital for development.
  • Its expression significantly decreases in adult tissues, with potential roles in adult stem cells.
  • Re-expression of Cripto-1 is observed in various human tumors.

Purpose of the Study:

  • To provide an updated survey of signaling pathways modulated by Cripto-1.
  • To elucidate the mechanistic insights into Cripto-1's biological functions in eukaryotic cells.

Main Methods:

  • Biochemical studies
  • Cell biology investigations
  • Animal studies

Main Results:

  • Cripto-1 promotes tumor cell proliferation, migration, invasion, epithelial-to-mesenchymal transition, and angiogenesis.
  • Cripto-1 interacts with numerous signaling molecules, including TGF-β family members (Nodal, GDF-1/-3, Activin, TGF-β1).
  • Cripto-1 activates the c-src/MAPK/Protein Kinase B (AKT) pathway and cross-talks with Wnt/β-catenin, Notch, and other pathways.

Conclusions:

  • Cripto-1's diverse biological effects stem from its interactions with multiple signaling pathways.
  • Understanding these interactions is key to deciphering Cripto-1's role in both development and cancer.

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