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Abstract
Free radicals are known to cause secondary neuronal damage in cerebral ischemia/reperfusion
(I/R). We investigated here the neuroprotective effect of resveratrol, a potent antioxidant
present in grape seed, against cerebral I/R-induced mitochondrial dysfunctions in
hippocampus. Transient rat middle cerebral artery occlusion (MCAO) model of brain
ischemia was used to induce brain infarction. Resveratrol (10(-7) g/kg) was given
twice intravenously: 15 min pre-occlusion and at the time of reperfusion (2 h post-occlusion).
Resveratrol significantly restored ATP content and the activity of mitochondrial respiratory
complexes in resveratrol treated group which were severely altered in MCAO group.
Western blot analysis showed a marked decrease in cytochrome c release as a result
of resveratrol treatment. Electrophoretic migration of hippocampal genomic DNA showed
a marked decrease in DNA fragmentation after resveratrol treatment. Notably, expression
of Hsp70 and metallothionein (MT) was significantly higher in MCAO group but their
expression was more significant in resveratrol treated group. The status of mitochondrial
glutathione (GSH), glucose 6-phosphate dehydrogenase (G6-PD) and serum lactate dehydrogenase
(LDH) was restored by resveratrol treatment with a significant decrease in mitochondrial
lipid peroxidation (LPO), protein carbonyl and intracellular H(2)O(2) content. Resveratrol
significantly improved neurological deficits assessed by different scoring methods.
Also, the brain infarct volume and brain edema were significantly reduced. Histological
analysis of CA1 hippocampal region revealed that resveratrol treatment diminished
intercellular and pericellular edema and glial cell infiltration. The findings of
this study highlight the ability of resveratrol in anatomical and functional preservation
of ischemic neurovascular units and its relevance in the treatment of ischemic stroke.