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자료유형
학술저널
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대한한방내과학회 대한한방내과학회지 대한한방내과학회지 제26권 제1호
발행연도
2005.1
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1 - 19 (19page)

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Objectives : Peroxynitrite (ONOO-), formed from the reaction of ․O2- and NO, is a cytotoxic species that can oxidize several cellular components such as proteins, lipids and DNA. It has been implicated in the aging process and age-related disease such as Alzheimer's disease, rheumatoid arthritis, cancer and atherosclerosis. Due to the lack of endogenous enzymes to thwart ONOO- activation, developing a specific ONOO- scavenger is remarkably important. The aim of this study was to investigate scavenging activities of ONOO- and its precursors, NO and ․O2- and its scavenging mechanism of Ojawhan. Methods : To investigate scavenging activities of ONOO-, NO, ․O2- and its scavenging mechanism using fluorescent probes, DCFDA, DAF-2 and DHR 123. The ONOO- scavenging activity on Ojawhan was assayed by measuring oxidized dihydrorhodamine 123 (DHR 123) by fluorometry. Oxidative stress was induced by strong oxidants t-butyl hydroperoxide (t-BHP). Endothelial cell (YPEN-1) was used for detection of intracellular oxidative stress. Results : Ojawhan markedly scavenged authentic ONOO-, ․O2- and NO. It also inhibited ONOO- induced by ․O2- and NO which are derived from SIN-1. Furthermore, Ojawhan blocked lipopolysaccharide (LPS)-induced ONOO-,․O2- and NO generation utilizing kidney homogenates of LPS-injected mouse and inhibited t-BHP-induced ROS and ONOO- in endothelial cell culture system. Conclusions : These results suggest that Ojawhan be developed as an effective ONOO- scavenger for the prevention of ONOO- involved diseases and age-related diseases.

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