A highly sensitive method for determining both Mn- and Cu-Zn superoxide dismutase activities in tissues and blood cells |
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| Authors: | M Nakano H Kimura M Hara M Kuroiwa M Kato K Totsune T Yoshikawa |
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| Institution: | College of Medical Care and Technology, Gunma University, Japan. |
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| Abstract: | A highly sensitive method for determining the superoxide dismutase (EC 1.15.1.1) in various tissues and blood cells is described. This method involves inhibition of a cypridina luciferin analog that is chemiluminescence dependent upon O2- generated by hypoxanthine-xanthine oxidase. Manganeous superoxide dismutase, which is sensitive to sodium dodecyl sulfate, was determined and calculated by subtraction of superoxide dismutase activity in tissue extract treated with this detergent (Cu-Zn superoxide dismutase) from that in untreated tissue extract (total superoxide dismutase). Both Mn- and Cu-Zn superoxide dismutase activities were expressed as equivalent nanograms of bovine erythrocyte superoxide dismutase per milliliter. Sensitivity limits of the chemiluminescence methods with 2-methyl-6-(p-methoxyphenyl)-3,7-dihydroimidazo1,2-alpha]pyraz in-3-one and 2-methyl-6-phenyl-3,7-dihydroimidazo1,2-alpha]pyrazin-3-one as cypridina luciferin analogs were 1 ng and 2-3 ng of superoxide dismutase/ml, respectively. |
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