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Inhibition of Neuroepithelial Patched-Induced Apoptosis by Sonic Hedgehog
Chantal Thibert,1Marie-Aimée Teillet,2Françoise Lapointe,2Laetitia Mazelin,1Nicole M. Le Douarin,2Patrick Mehlen1,3*
During early development in vertebrates, Sonic hedgehog (Shh)is produced by the notochord and the floor plate. A ventrodorsalgradient of Shh directs ventrodorsal patterning of the neuraltube. However, Shh is also required for the survival of neuroepithelialcells. We show that Patched (Ptc) induces apoptotic cell deathunless its ligand Shh is present to block the signal. Moreover,the blockade of Ptc-induced cell death partly rescues the chickspinal cord defect provoked by Shh deprivation. Thus, the proapoptoticactivity of unbound Ptc and the positive effect of Shh-boundPtc on cell differentiation probably cooperate to achieve theappropriate spinal cord development.
1 Apoptosis/Differentiation Laboratory, "La Ligue," Molecular and Cellular Genetic Center, CNRS Unite Mixte Recherche (UMR) 5534, University of Lyon, 69622 Villeurbanne, France. 2 Laboratoire d'Embryologie Cellulaire et Moléculaire, CNRS UMR 7128, 49 bis, Avenue de la Belle-Gabrielle, 94736 Nogent-sur-Marne Cedex, France. 3 International Agency for Research in Cancer, 69008 Lyon, France.
* To whom correspondence should be addressed. E-mail: mehlen{at}univ-lyon1.fr
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