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PKCepsilon, via its regulatory domain and independently of its catalytic domain, induces neurite-like processes in neuroblastoma cells

Author:
  • Ruth Zeidman
  • Bjarne Löfgren
  • Sven Påhlman
  • Christer Larsson
Publishing year: 1999
Language: English
Pages: 713-726
Publication/Series: Journal of Cell Biology
Volume: 145
Issue: 4
Document type: Journal article
Publisher: Rockefeller University Press

Abstract english

To investigate the role of protein kinase C (PKC) isoforms in regulation of neurite outgrowth, PKCalpha, betaII, delta, and epsilon fused to enhanced green fluorescent protein (EGFP) were transiently overexpressed in neuroblastoma cells. Overexpression of PKCepsilon-EGFP induced cell processes whereas the other isoforms did not. The effect of PKCepsilon-EGFP was not suppressed by the PKC inhibitor GF109203X. Instead, process formation was more pronounced when the regulatory domain was introduced. Overexpression of various fragments from PKCepsilon regulatory domain revealed that a region encompassing the pseudosubstrate, the two C1 domains, and parts of the V3 region were necessary and sufficient for induction of processes. By deleting the second C1 domain from this construct, a dominant-negative protein was generated which suppressed processes induced by full-length PKCepsilon and neurites induced during retinoic acid- and growth factor-induced differentiation. As with neurites in differentiated neuroblastoma cells, processes induced by the PKCepsilon- PSC1V3 protein contained alpha-tubulin, neurofilament-160, and F-actin, but the PKCepsilon-PSC1V3-induced processes lacked the synaptic markers synaptophysin and neuropeptide Y. These data suggest that PKCepsilon, through its regulatory domain, can induce immature neurite-like processes via a mechanism that appears to be of importance for neurite outgrowth during neuronal differentiation.

Keywords

  • Orthopedics
  • Cancer and Oncology
  • neuronal differentiation
  • C1 domains
  • neuroblastoma cells
  • neurite outgrowth
  • protein kinase C

Other

Published
  • Clinical and Molecular Osteoporosis Research
  • ISSN: 0021-9525
Sven Påhlman
E-mail: sven [dot] pahlman [at] med [dot] lu [dot] se

Professor

Division of Translational Cancer Research

+46 46 222 64 21

MV406 312K1

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