Regulation of Aortic CuZn-superoxide Dismutase with Copper. Effects in Vivo

Overview

Journal Biochem J

Specialty Biochemistry

Date 1987 Dec 15

PMID 3435476

Citations 10

Authors

C T Dameron

E D HARRIS

Affiliations

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Abstract

Cu2Zn2-superoxide dismutase (CuZn-SOD) was purified from chicken liver. The liver enzyme had a subunit Mr of 16900 and contained equimolar amounts of copper and zinc [0.26% (w/w) for each]. Aortic CuZn-SOD had the same Mr as estimated by gel filtration and cross-reacted with antibodies to the liver enzyme. Both enzymes were inhibited by 1.0 mM-NaCN. Within 24-72 h after hatching, total SOD activity in aorta rose 3-fold over the day-1 level and stayed elevated for 10 days. With low dietary copper, the total SOD activity rose as before, but then decayed progressively to non-detectable levels in 10 days. Both the cyanide-sensitive (CuZn-SOD) and insensitive (mangano-SOD) activities fell, but not at the same rate. When the 10-day-old deficient chicks were injected with 0.5 mumol of CuSO4 intraperitoneally, SOD activity in aorta was restored to control levels in about 8 h. Despite non-measurable SOD activity in aorta, extracts from the 15-day-old-deficient-chick tissue contained as much, or slightly more, immunoreactive CuZn-SOD protein as age-matched control tissue. The data show clearly that dietary copper regulates SOD activity in the aortas of young developing animals. They further suggest that a copper deficiency suppresses CuZn-SOD activity without inhibiting synthesis or accumulation of the CuZn protein in this tissue.

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