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Morphogens and cell survival during development.

Patrick Mehlen1, Fréderic Mille, Chantal Thibert

  • 1Laboratoire Apoptose, Cancer et Développement, Equipe labelisée La Ligue, CNRS FRE2870, Centre Léon Bérard, 69008 Lyon, France. mehlen@lyon.fnclcc.fr

Journal of Neurobiology
|July 26, 2005
PubMed
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Morphogens like Sonic Hedgehog regulate cell survival, not just differentiation. This challenges the "death by default" idea, showing active cell death is key in development.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Cell Biology

Background:

  • Morphogens guide cell fate via concentration gradients.
  • Transforming Growth Factor-beta (TGF-beta), Hedgehog (Hh), and Wnt families are key morphogen candidates.
  • Morphogens are traditionally viewed as differentiation inducers.

Purpose of the Study:

  • To review the role of morphogens in cell survival.
  • To emphasize Sonic Hedgehog (Shh) as a cell survival regulator.
  • To challenge the "death by default" hypothesis.

Main Methods:

  • Literature review of morphogen research.
  • Analysis of studies on morphogen function in cell death and survival.
  • Focus on Sonic Hedgehog (Shh) signaling pathways.

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Main Results:

  • Morphogens actively regulate cell survival.
  • Experimental removal of morphogens can lead to active cell death, not just abnormal differentiation.
  • Sonic Hedgehog (Shh) plays a critical role in maintaining cell survival.

Conclusions:

  • Morphogens are key regulators of cell survival.
  • Cell death is an active process in tissue and organ development.
  • Re-evaluation of morphogen function beyond differentiation induction is necessary.