Notch signaling promotes astrogliogenesis via direct CSL-mediated glial gene activation

Weihong Ge, Keri Martinowich, Xiangbing Wu, Fei He, Alison Miyamoto, Guoping Fan, Gerry Weinmaster, Yi Eve Sun

Research output: Contribution to journalArticlepeer-review

Abstract

In the developing central nervous system (CNS), Notch signaling preserves progenitor pools and inhibits neurogenesis and oligodendroglial differentiation. It has recently been postulated that Notch instructively drives astrocyte differentiation. Whether the role of Notch signaling in promoting astroglial differentiation is permissive or instructive has been debated. We report here that the astrogliogenic role of Notch is in part mediated by direct binding of the Notch intracellular domain to the CSL DNA binding protein, forming a transcriptional activation complex onto the astrocyte marker gene, glial fibrillary acidic protein (GFAP). In addition, we found that, in CSL-/neural stem cell cultures, astrocyte differentiation was delayed but continued at a normal rate once initiated, suggesting that CSL is involved in regulating the onset of astrogliogenesis. Importantly, although the classical CSL-dependent Notch signaling pathway is intact and able to activate the Notch canonical target promoter during the neurogenic phase, it is unable to activate the GFAP promoter during neurogenesis. Therefore, the effect of Notch signaling on target genes is influenced by cellular context in regulation of neurogenesis and gliogenesis.

Original languageEnglish (US)
Pages (from-to)848-860
Number of pages13
JournalJournal of neuroscience research
Volume69
Issue number6
DOIs
StatePublished - Sep 15 2002
Externally publishedYes

Keywords

  • Astrocytes
  • CSL proteins
  • Delta
  • Neural stem cells
  • Notch

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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