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자료유형
학술저널
저자정보
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제39권 제4호
발행연도
2007.1
수록면
556 - 563 (8page)

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Several studies have demonstrated that ischemic pre-conditioning increases superoxide dismutase activ-ity, but it is unclear how ischemic preconditioning duction during subsequent severe ischemia and re-perfusion in the hippocampus. To answer this ques-tion, we investigated whether ischemic precondition-ing in the hippocampal CA1 region increases the activities of antioxidant enzymes glutathione perox-idase and catalase, resulting in a decrease in the level of hydroxyl radicals during subsequent severe ischemia-reperfusion. Transient forebrain ischemia was induced by four-vessel occlusion in rats. ation was performed and a 15-min severe ischemia was induced three days later. Ischemic precondition-ing preserved the CA1 hipocampal neurons follow-ing severe ischemia. The concentration of 2,3-dihy-droxybenzoic acid, an indicator of hydroxyl radical, was measured using in vivo microdialysis technique combined with HPLC. The ischemia-induced increase in the ratio of 2,3-dihydroxybenzoic acid concen-between preconditioned and control groups. On the other hand, activities of the antioxidant enzymes glu-tathione peroxidase-1 and catalase were significantly increased at 3 days after ischemic preconditioning in the hippocampus. Our results suggest that, in pre-conditioned rats, while hydrogen peroxide is gen-erated from severe ischemia, the activity of catalase and glutathione peroxidase-1 is correspondingly in-xide. However, our results show that the enhanced activity of these antioxidant enzymes in precondi-tioned rats is not suficient to decrease hydroxyl radi-cal levels during subsequent severe ischemia-re-perfusion.

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