Summary
Cutaneous and mucous epithelia of various organs of laboratory rodents were analysed histochemically for reactive oxygen species (ROS)-generating oxidases using cerium methods. High activities of xanthine oxidase and also superoxide dismutase were present in orthokeratotic stratified squamous epithelia of skin, lips, esophagus and forestomach and parakeratotic keratinizing stratified epithelia of vagina, tongue and penis. Moreover, activity was found in simple epithelium of the uterus and intestine of rats, mice and guinea-pigs. Moderate activities of monoamine oxidase and d-amino acid oxidase were only seen in enterocytes of large and small intestine, whereas α-hydroxy acid oxidase could not be detected at all. With the use of specific inhibitors for superoxide anions-producing xanthine oxidase and H2O2-generating superoxide dismutase it was shown that epithelial cells of all studied external and internal surface epithelia contain a highly effective xanthine oxidase-superoxide dismutase system. It is hypothesized that this system might have a general microbicidal function and might play a special role in tumor promotion of the skin.
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Dedicated to Prof. Dr. T. Günther on the occasion of his 60th birthday
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Gossrau, R., Frederiks, W.M. & van Noorden, C.J.F. Histochemistry of reactive oxygen-species (ROS)-generating oxidases in cutaneous and mucous epithelia of laboratory rodents with special reference to xanthine oxidase. Histochemistry 94, 539–544 (1990). https://doi.org/10.1007/BF00272619
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DOI: https://doi.org/10.1007/BF00272619