Pre-exposure to heat shock inhibits peroxynitrite-induced activation of poly(ADP) ribosyltransferase and protects against peroxynitrite cytotoxicity in J774 macrophages

Csaba Szabo, Hector R. Wong, Andrew L. Salzman

Research output: Contribution to journalArticle

20 Scopus citations


The reaction of nitric oxide (NO) with superoxide yields the cytotoxic oxidant peroxynitrite, produced during inflammation and shock. A novel pathway of peroxynitrite cytotoxicity involves activation of the nuclear enzyme poly(ADP) ribosyltransferase, and concomitant ADP-ribosylation, NAD+ consumption and exhaustion of intracellular energy stores. In the present report we provide evidence that pre-exposure of J774 macrophages to heat shock reduces peroxynitrite-induced activation of poly(ADP) ribosyltransferase and protects against the peroxynitrite-induced suppression of mitochondrial respiration. The protection was significant at 8 h after heat shock, but was absent at 24 h after heat shock. Thus, the protection showed a temporal correlation with the expression of heat shock protein 70, the expression of which was maximal at 8 h. Exposure to heat shock did not alter the expression of poly(ADP) ribosyltransferase over 24 h. In summary, the heat shock phenotype or heat shock proteins may protect against peroxynitrite induced cytotoxicity.

Original languageEnglish (US)
Pages (from-to)221-226
Number of pages6
JournalEuropean Journal of Pharmacology
Issue number2
StatePublished - Nov 14 1996
Externally publishedYes



  • Endotoxin
  • Inflammation
  • Mitochondrial respiration
  • Nitric oxide (NO)
  • Shock
  • Superoxide

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Pharmacology

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