Tissue hypoxia activates JNK in the liver during hemorrhagic shock

Carol A. McCloskey*, Marina V. Kameneva, Arkady Uryash, David J. Gallo, Timothy R. Billiar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

The earliest signaling pathways responsible for initiating the systemic response to hemorrhagic shock (HS) remain poorly characterized. We have investigated the involvement of the mitogen-activated protein (MAP) kinase C-JUN N-terminal kinase (JNK) and its activation in the liver as an early response to tissue hypoxia soon after the initiation of hemorrhage. In the present studies, hemorrhage of mice to 25 mmHg for 30 min resulted in a significant (2.1-fold) increase in JNK phosphorylation within the liver. Results were similar in rats hemorrhaged to 40 mmHg for 1 h. Hypoxia alone, replicated by warm isolated hepatic ischemia in vivo or hepatocytes cultured under 1% oxygen, also resulted in JNK phosphorylation. Finally, preservation of tissue perfusion and oxygenation by pretreatment with a blood-soluble drag-reducing polymer (DRP) in the rat HS model prevented phosphorylation of JNK in the liver. These results identify tissue hypoxia as a key factor in activating early signaling events in the liver following hemorrhage, as measured by JNK phosphorylation.

Original languageEnglish
Pages (from-to)380-386
Number of pages7
JournalShock
Volume22
Issue number4
DOIs
StatePublished - Oct 2004
Externally publishedYes

Keywords

  • Drag-reducing polymers
  • Hypoxemia
  • Ischemia
  • MAP kinase
  • Signaling
  • Stress response

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