Sep 1, 1994

Antioxidant defences in the microaerophilic protozoan Trichomonas vaginalis: comparison of metronidazole-resistant and sensitive strains

J E EllisD Lloyd


The sensitivity of the microaerophilic protozoan Trichomonas vaginalis to oxygen and products of its reduction, and the antioxidant defences employed by this organism, were investigated. Studies revealed that this amitochondrial flagellate is sensitive to oxygen tensions above those experienced in situ in the vagina (i.e. > 60 microM) and that metronidazole-resistant strains (CDC 85 and IR78) were more sensitive to elevated oxygen levels than a metronidazole-sensitive isolate (1910). In the presence of radical scavengers, inactivation of organisms at 60 microM oxygen was significantly lessened. Investigation of the antioxidant enzymes present in this organism revealed that activities of peroxide-reducing enzymes (e.g. catalase and general peroxidase) were not detectable, but that a cyanide-insensitive, azide-sensitive superoxide dismutase was present in cell extracts. Measurement of thiol-cycling enzymes indicated that NADPH could drive the reduction of oxidized glutathione (thiol reductase); however, the corresponding peroxidase activity was not detected. Analysis of thiols in whole cells of T. vaginalis indicated that glutathione was absent, but high levels of other thiols, propanethiol, methanethiol and H2S, were present. No...Continue Reading

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Mentioned in this Paper

Enzymes, antithrombotic
Glutathione Disulfide
Antioxidant Effect
Peroxidase Activity
Sulfhydryl Compounds

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