Journal
BIOLOGICAL & PHARMACEUTICAL BULLETIN
Volume 24, Issue 5, Pages 558-563Publisher
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/bpb.24.558
Keywords
traditional Chinese medicine; antioxidant herb medicine; cerebral oxidative damage; ischemia-reperfusion; Qizhu Tang; composite formula
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A traditional Chinese herbal medicine, Qizhu Tang (QZT) was studied for its in vitro antioxidant activity and the effect on cerebral oxidative damage after forebrain ischemia followed by reperfusion in rats. The QZT decoction was shown to have strong hydroxyl radical (. OH) scavenging activity (approx. 0.1 mM as Trolox equivalent) when determined by ESR using DMPO as a spin trap reagent and H2O2/UV as the . OH source. when the QZT decoction was injected into rat duodenum 2h before cerebral ischemia, the oxidative brain damage after 45 min reperfusion was strongly inhibited in terms of two biochemical indications, thiobarbituric acid reactive substance formation and the loss of glutathione peroxidase, Since the QZT formula consists of 4 herbal constituents (Rhizoma atractylodis, Poria, Radix notoginseng and Radix astragali), each of the component herbs and their combinations were also examined for their protective effects on the cerebral ischemia/reperfusion injury and the effects were compared with their in vitro antioxidant potential. Although some of the incomplete formulas showed as strong antioxidant activities as complete QZT in vitrio, only the complete QZT formula was effective in preventing cerebral oxidative injury in rats, and other preparations showed limited activity in vitro.
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