Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Formation of Reactive Oxygen Intermediates Might be Involved in the Trypanocidal Activity of Gallic Acid
Mitsuhiko NOSETatsuo KOIDEKyoko MORIKAWAMakoto INOUEYukio OGIHARAYoshisada YABUNobuo OHTA
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1998 Volume 21 Issue 6 Pages 583-587


We investigated the mechanism of the trypanocidal activity of gallic acid (GA). GA-induced trypanocidal activity was significantly reduced by pretreatment with superoxide dismutase (SOD) and/or catalase. The ESR technique with 5, 5-dimethyl-1-pyrroline N-oxide (DMPO) as a spin trapping agent revealed that a DMPO-OH adduct was detected in culture medium containing GA. The intensity of ESR signals of the DMPO-OH adduct was increased in a time dependent manner. SOD also inhibited the formation of GA-induced DMPO-OH adducts. Furthermore, GA enhanced DNA single-strand breaks induced by Fenton reagent. These results suggest the possibility that GA acts as a pro-oxidant for trypanocidal activity.

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