Cell Division Mode Change Mediates the Regulation of Cerebellar Granule Neurogenesis Controlled by the Sonic Hedgehog Signaling

Stem Cell Reports. 2015 Nov 10;5(5):816-828. doi: 10.1016/j.stemcr.2015.09.019. Epub 2015 Oct 29.

Abstract

Symmetric and asymmetric divisions are important for self-renewal and differentiation of stem cells during neurogenesis. Although cerebellar granule neurogenesis is controlled by sonic hedgehog (SHH) signaling, whether and how this process is mediated by regulation of cell division modes have not been determined. Here, using time-lapse imaging and cell culture from neuronal progenitor-specific and differentiated neuron-specific reporter mouse lines (Math1-GFP and Dcx-DsRed) and Patched ± mice in which SHH signaling is activated, we find evidence for the existence of symmetric and asymmetric divisions that are closely associated with progenitor proliferation and differentiation. While activation of the SHH pathway enhances symmetric progenitor cell divisions, blockade of the SHH pathway reverses the cell division mode change in Math1-GFP; Dcx-DsRed; Patched ± mice by promoting asymmetric divisions or terminal neuronal symmetric divisions. Thus, cell division mode change mediates the regulation of cerebellar granule neurogenesis controlled by SHH signaling.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Asymmetric Cell Division*
  • Cell Line
  • Cells, Cultured
  • Cerebellum / cytology*
  • Cerebellum / growth & development
  • Hedgehog Proteins / genetics*
  • Hedgehog Proteins / metabolism
  • Mice
  • Mice, Inbred C57BL
  • Neural Stem Cells / cytology*
  • Neural Stem Cells / metabolism
  • Neurogenesis*
  • Patched Receptors
  • Receptors, Cell Surface / genetics
  • Receptors, Cell Surface / metabolism
  • Signal Transduction

Substances

  • Hedgehog Proteins
  • Patched Receptors
  • Receptors, Cell Surface
  • Shh protein, mouse