Differential induction of superoxide dismutase in core and penumbra regions after transient focal ischemia in the rat neocortex.
Oxygen free radicals are postulated to participate in the pathogenesis of ischemic brain injury. The present study investigated the response of the endogenous antioxidant enzyme, superoxide dismutase (SOD), in a model of transient focal ischemia in the rat neocortex. SOD activity was increased significantly in the penumbra region at 6-24 h postischemia, while no significant changes in SOD activity were observed in either the core region or striatum. These results indicate that endogenous antioxidant activity is differentially affected by the intensity of ischemic challenge and suggest that the regional effects of oxygen free radicals may vary substantially following ischemia-reperfusion.
Toyoda
T
T
Department of Neurological Surgery, Health Sciences Center, University of Virginia, Charlottesville 22908, USA.
Lee
K S
KS
D000818:Animals; D002536:Cerebral Arteries; D002546:Ischemic Attack, Transient / Q000503:physiopathology*; D008297:Male; D019579:Neocortex / Q000201:enzymology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013482:Superoxide Dismutase / Q000378:metabolism*; D013997:Time Factors
D013482:Superoxide Dismutase