The rate of respiration and incorporation of P32 into adenosine triphosphate by rat aorta tissue

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  • The Rate of Respiration and Incorporation of P<SUP>32</SUP> into Adenosine Triphosohate of Rat Aorta Tissue

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Tissue respiration and rate of incorporation of P32 into ATP of rat aorta were studied by using Warburg technique in vitro. 1. A decrease of the incorporation rate of P32 into ATP was observed within 45 minutes after sacrifice when the aortas were stored in a cold Krebs-Ringer-phosphate solution (pH 7 .4), 2. The metabolic inhibitors, cyanide and fluoride, depressed both the respiration and the incorporation of P32 into ATP. 3. The incorporation rate of P32 into ATP of aortas from 12 to 15 months old rats was lower than that of 1 to 2 months old rats, while no significant difference in Qo2 of aortas from young and old rats was observed. 4. The enhancement of both the respiration and the incorporation of P32 into ATP of rat aorta by acetylcholine was significant in young but not in old rats. 5. The incorporation of P32 into ATP was depressed in aortas from rats fed a magnesium deficient diet for 2 to 4 weeks, while the oxygen uptake was not decreased in a significant amount.

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