Abstract
Multiple electrophoretic molecular variants of superoxide dismutase were demonstrated in normal rat mammary tissues and DMBA-induced rat mammary tumors. The specific activities of CuZu superoxide dismutase in mammary tumors of estrogen-treated rats were not significantly different from those activities seen in normal rat mammary tissues. However, the enzyme activities of mammary tumors from untreated rats (no estrogen) were significantly lower than the activities of normal rat mammary tissues. Exogenous estrogen appeared to raise superoxide dismutase levels in DMBA-induced rat mammary tumors to those levels seen in normal rat mammary tissues.
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