alexa Reduced up-regulation of cytoprotective genes in rat cutaneous tissue during the second cycle of ischemia-reperfusion.
Infectious Diseases

Infectious Diseases

Journal of AIDS & Clinical Research

Author(s): Sisco M, Liu WR, Kryger ZB, Mustoe TA, Sisco M, Liu WR, Kryger ZB, Mustoe TA

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Abstract Chronic wounds are major health problems that affect millions of people in the United States every year. Management of these wounds costs billions of dollars annually in the United States. Despite their clinical importance, the molecular mechanisms underlying these clinical conditions remain elusive. Repetitive ischemia-reperfusion (I-R) may play a pivotal role in chronic wound formation. The development of therapies for these wounds is hindered by the lack of animal models that allow identification of the molecular mechanisms underlying chronic wound formation. In the first study of its kind, we adapted our rat pressure sore model by imposing two cycles of ischemia (2 hours) and two cycles of reperfusion (24 hours), and we examined gene expression to better understand the molecular events that occur at the very early stages of cutaneous I-R injury with a goal of devising preventing strategies. We successfully tested our hypothesis and demonstrated that while cytoprotective genes, such as heat shock protein 70, heat shock protein 90, hypoxia-inducible factor-1alpha, vascular endothelial growth factor, and heme oxygenase-1, were initially up-regulated during the first cycle of I-R, their up-regulation was subsequently reduced or completely abolished during the second cycle of I-R. These findings raise the possibility that reduced up-regulation of these cytoprotective genes may be causally linked to cutaneous I-R injury. This article was published in Wound Repair Regen and referenced in Journal of AIDS & Clinical Research

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