The Sonic hedgehog pathway independently controls the patterning, proliferation and survival of neuroepithelial cells by regulating Gli activity

Jordi Cayuso, Fausto Ulloa, Barny Cox, James Briscoe, Elisa Martí

Research output: Contribution to journalArticlepeer-review

Abstract

During CNS development, the proliferation of progenitors must be coordinated with the pattern of neuronal subtype generation. In the ventral neural tube, Sonic hedgehog acts as a long range morphogen to organise the pattern of cell differentiation by controlling the activity of Gli transcription factors. Here, we provide evidence that the same pathway also acts directly at long range to promote the proliferation and survival of progenitor cells. Blockade of Shh signaling or inhibition of Gli activity results in cell autonomous decreases in progenitor proliferation and survival. Conversely, positive Gli activity promotes proliferation and rescues the effects of inhibiting Shh signaling. Analysis of neural cells indicates that Shh/Gli signaling regulates the G1 phase of cell cycle and the expression of the anti-apoptotic factor Bcl2. Furthermore, Shh signaling independently regulates patterning, proliferation and survival of neural cells, thus Shh/Gli activity couples these separate cellular responses of progenitors to coordinate neural development.
Original languageEnglish
Pages (from-to)517-528
Number of pages12
JournalDevelopment
Volume133
Issue number3
DOIs
Publication statusPublished - 1 Feb 2006

Keywords

  • spinal cord
  • neural development
  • pattern formation
  • cell proliferation
  • cell survival
  • hedgehog signalling
  • Gli proteins
  • chick

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