title: Mild hypothermia diminishes oxidative DNA damage and pro-death signaling events after cerebral ischemia: a mechanism for neuroprotection.
abstract: Mild hypothermia, applied either during or soon after cerebral ischemia, has been shown to confer robust neuroprotection against brain injury in experimental stroke and in patients recovering from cardiac arrest. However, the mechanism underlying hypothermic neuroprotection is not completely understood. In this study, the effect of mild hypothermia on the induction of oxidative DNA damage, an early harmful event during post-ischemic reperfusion that triggers both necrotic and apoptotic cell death in the brain, was studied using the rat model of middle cerebral artery occlusion (MCAO) and reperfusion. Rats were subjected to 2-hr MCAO and reperfusion of various durations up to 3 days. Selective brain hypothermia (33 degrees C) was induced at the onset of ischemia and terminated at the beginning of reperfusion, and this significantly decreased infarct volume 72 hr later. Correlated with this protective effect, intraischemic mild hypothermia markedly attenuated the nuclear accumulations of several oxidative DNA lesions, including 8-oxodG, AP sites, and DNA single-strand breaks, after 2-hr MCAO. Consequently, harmful DNA damage-dependent signaling events, including NAD depletion, p53 activation, and mitochondrial translocation of PUMA and NOXA, were reduced during post-ischemic reperfusion in hypothermia-treated brains. These results suggest that the attenuation of oxidative DNA damage and DNA damage-triggered pro-death signaling events may be an important mechanism underlying the neuroprotective effect of mild hypothermia against ischemic brain injury.
authors.affiliation: Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, USA.
authors.forename: Xunming
authors.initials: X
authors.lastname: Ji
authors.forename: Yumin
authors.initials: Y
authors.lastname: Luo
authors.forename: Feng
authors.initials: F
authors.lastname: Ling
authors.forename: R Anne
authors.initials: RA
authors.lastname: Stetler
authors.forename: Jing
authors.initials: J
authors.lastname: Lan
authors.forename: Guodong
authors.initials: G
authors.lastname: Cao
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
mesh_terms: D000818:Animals; D017209:Apoptosis; D020520:Brain Infarction / Q000473:pathology / Q000628:therapy; D002545:Brain Ischemia / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D053904:DNA Breaks, Single-Stranded; D004249:DNA Damage; D007036:Hypothermia, Induced; D008297:Male; D009243:NAD / Q000378:metabolism; D018384:Oxidative Stress; D051381:Rats; D017207:Rats, Sprague-Dawley; D015398:Signal Transduction; D016159:Tumor Suppressor Protein p53 / Q000037:antagonists & inhibitors
chemical_list: D016159:Tumor Suppressor Protein p53; D009243:NAD