Dexamethasone abolishes the activation by nerve growth factor of protein kinase N: effects of nerve growth factor and dexamethasone on protein kinase N

Cinzia Volonté

Research output: Contribution to journalArticle

Abstract

Protein kinase N (PKN) is a basic 45-47 kDa serine/threonine protein kinase activated by NGF and several other factors in PC12 cells and other cell types. It is inhibited in vitro by purine analogs. In this work, we further characterize the modulation of PKN activity following exposure of PC12 cells to dexamethasone or NGF, which respectively direct these cells towards the chromaffin- or neuron-like phenotype. We show here that the two factors elicit opposite effects on the activation of the kinase: dexamethasone inhibits while NGF stimulates the basal level of PKN activity. Simultaneous addition to the cells of the factors causes no variation from basal kinase activity. Addition of dexamethasone not to the cells, but to partially purified PKN during the kinase assay, causes no modulation of the enzyme.

Original languageEnglish
Pages (from-to)119-122
Number of pages4
JournalNeuroscience Letters
Volume159
Issue number1-2
DOIs
Publication statusPublished - Sep 3 1993

Keywords

  • Dexamethasone
  • Nerve growth factor
  • PC12 cell
  • Protein kinase N

ASJC Scopus subject areas

  • Neuroscience(all)

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