Hyperbaric Oxygen Attenuates Apoptosis and Decreases Inflammation in an Ischemic Wound Model.

Authors: Zhang, Q  Chang, Q  Cox, RA  Gong, X  Gould, LJ 
Citation: Zhang Q, etal., J Invest Dermatol. 2008 Mar 13;.
Pubmed: (View Article at PubMed) PMID:18337831
DOI: Full-text: DOI:10.1038/jid.2008.53

The molecular mechanisms whereby hyperbaric oxygen (HBO) improves ischemic wound healing remain elusive. In this study, a rat model of wound ischemia was used to test the hypothesis that HBO enhances wound healing by modulating hypoxia-inducible factor-1alpha (HIF-1alpha) signaling. Male Sprague-Dawley rats underwent creation of a previously validated ischemic flap. Three groups underwent daily treatment: HBO (90 minutes, 2.4 atm); systemic administration of the free radical scavenger, N-acetylcysteine (NAC 150 mg kg(-1) intraperitoneal); control (neither HBO nor NAC). HBO treatment improved healing of the ischemic wounds. Analysis of ischemic wound tissue extracts demonstrated significantly reduced expression of HIF-1alpha, p53, and BNip3. Additionally, HBO increased expression of Bcl-2 while decreasing cleaved caspase-3. DNA fragmentation was abolished and the number of TUNEL-positive cells was reduced compared to the other groups. Vascular endothelial growth factor, cyclooxygenase-2, and neutrophil infiltration were reduced in ischemic wounds treated with HBO. These results indicate that HBO improves ischemic wound healing by downregulation of HIF-1alpha and subsequent target gene expression with attenuation of cell apoptosis and reduction of inflammation.Journal of Investigative Dermatology advance online publication, 13 March 2008; doi:10.1038/jid.2008.53.

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RGD ID: 2290551
Created: 2008-03-19
Species: All species
Last Modified: 2008-03-19
Status: ACTIVE



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