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Regulation of the Notch target gene Hes-1 by TGFalpha induced Ras/MAPK signaling in human neuroblastoma cells.

  • Marie Stockhausen
  • Jonas Sjölund
  • Håkan Axelson
Publishing year: 2005
Language: English
Pages: 218-228
Publication/Series: Experimental Cell Research
Volume: 310
Issue: Aug 22
Document type: Journal article
Publisher: Academic Press

Abstract english

Ras and Notch signaling have recently been shown to cooperate in the maintenance of neoplastic transformation. Here, we show that TGF alpha, a known activator of Ras signaling, can drive cell proliferation and at the same time induce the expression of the Notch target Hes-1 in the neuroblastoma cell line SK-N-BE(2)c. The up-regulation of Hes-1 occurred both at the transcriptional and protein levels and by use of EGFR and MEK inhibitors we could show that the Hes-1 response was dependent on activation of the MAP kinase ERK. Blocking Notch activation by gamma-secretase inhibition did not profoundly affect the Hes-1 levels, neither in untreated nor in TGF alpha treated cells. The upregulation of Hes-1 was associated with down-regulation of its pro-neuronal target gene Hash-1. Taken together, these results show that TGF alpha is a potent mitogen of neuroblastoma cells and suggest a connection between activation of ERK and Hes-1, thus providing a link between the Ras and Notch signaling pathways.


  • Cancer and Oncology
  • neuroblastoma
  • Notch
  • TGF alpha
  • ERK
  • Hes-1
  • Ras/MAPK signaling
  • Hash-1


  • ISSN: 1090-2422
Håkan Axelson
E-mail: hakan [dot] axelson [at] med [dot] lu [dot] se