Protein kinase D specifically mediates apoptosis signal-regulating kinase 1-JNK signaling induced by H2O2 but not tumor necrosis factor

Wei Zhang, Shusen Zheng, Peter Storz, Wang Min

Research output: Contribution to journalArticle

85 Scopus citations

Abstract

Although both tumor necrosis factor (TNF) and H2O2 induce activation of c-Jun N-terminal kinase (JNK) kinase cascades, it is not known whether they utilize distinct intracellular signaling pathways. In this study, we first examined a variety of pharmacological inhibitors on TNF and H2O2-induced JNK activation. Gö6083 or staurosporine, which inhibits protein kinase C isoforms had no effects on TNF or H 2O2-induced JNK activation. However, Gö6976 and calphostin, which can inhibit protein kinase C as well as protein kinase D (PKD), blocked H2O2- but not TNF-induced JNK activation, suggesting that PKD may be specifically involved in H2O 2-induced JNK activation. Consistently, H2O2, but not TNF, induced phosphorylation of PKD and translocation of PKD from endothelial cell membrane to cytoplasm where it associates with the JNK upstream activator, apoptosis signal-regulating kinase 1 (ASK1). The association is mediated through the pleckstrin homology domain of PKD and the C-terminal domain of ASK1. Inhibition of PKD by Gö6976 or by small interfering RNA of PKD blocked H2O2-induced ASK1-JNK activation and endothelial cell apoptosis. Interestingly, H2O2 induced 14-3-3 binding to PKD via the phospho-Ser-205/208 and phospho-Ser-219/223 and H 2O2-induced 14-3-3 binding of PKD was specifically blocked by Gö6976 but not by Gö6983. More significantly, the 14-3-3-binding defective forms of PKD failed to associate with ASK1 and to activate JNK signaling, highlighting the importance of 14-3-3 binding of PKD in H 2O2-induced activation of ASK1-JNK cascade. Thus, our data have identified PKD as a critical mediator in H2O2- but not TNF-induced ASK1-JNK signaling.

Original languageEnglish (US)
Pages (from-to)19036-19044
Number of pages9
JournalJournal of Biological Chemistry
Volume280
Issue number19
DOIs
StatePublished - May 13 2005

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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