Peroxynitrite modulates the activation of p38 and extracellular regulated kinases in PC12 cells

Richard S. Jope, Liang Zhang, Ling Song

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


Although peroxynitrite appears to contribute to neuronal dysfunction in several neurodegenerative disorders, little is known about how peroxynitrite affects cellular signaling processes. This study investigated if peroxynitrite affects the mitogen-activated protein kinases, extracellular- regulated kinases 1 and 2 (ERK1/2) and p38. Exposure of PC12 cells to 500 μM peroxynitrite activated ERK1/2 and 938 within 5 min and this was followed by gradual decreases in activation over the next 25 min. Activation of ERK1/2 by peroxynitrite was mediated by activation of the epidermal growth factor (EGF) receptor in a calcium/calmodulin-dependent kinase II- and src family tyrosine kinase-dependent manner, as it was blocked by the selective EGF receptor inhibitor AG1478, by KN62, an inhibitor of calcium/calmodulin-dependent kinase II, and by PP1, a src family tyrosine kinase inhibitor. Activation of p38 by peroxynitrite was independent of the EGF receptor, required activation of calcium/calmodulin-dependent kinase II and src family tyrosine kinases, and was modulated by nerve growth factor (NGF) in a time-dependent manner. Pretreatment with NGF (2 h) attenuated, whereas cotreatment with NGF potentiated, peroxynitrite-induced activation of p38. Thus, peroxynitrite activates ERK1/2 and p38, activation of EGF receptors, calcium/calmodulin- dependent kinase II, and src family tyrosine kinases participate in these signaling responses to peroxynitrite, and peroxynitrite- and NGF-induced signaling activities converge on p38. (C) 2000 Academic Press.

Original languageEnglish (US)
Pages (from-to)365-370
Number of pages6
JournalArchives of Biochemistry and Biophysics
Issue number2
StatePublished - Apr 15 2000
Externally publishedYes


  • Alzheimer's disease
  • ERK
  • NGF
  • Oxidative stress
  • P38
  • Peroxynitrite

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology


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