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Journal of Nutrition Vol. 98 No. 3 July 1969, pp. 351-355
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Influence of Zinc and Vitamin D on Plasma Amino Acids and Liver Xanthine Oxidase in Rats1,2,

Doris Romine Riley, Inez Harrill and Elizabeth Dyar Gifford

Department of Food Science and Nutrition, Agricultural Experiment Station, Colorado State University, Fort Collins, Colorado

Plasma amino acids and liver xanthine oxidase activity were determined in rats fed a control diet with and without calciferol or fed diets providing 9% casein with and without added zinc and calciferol. Reduction of dietary protein resulted in a significant decrease in xanthine oxidase activity, concentrations of plasma threonine, methionine, isoleucine, leucine and phenylalanine, and in elevated histidine levels. Addition of calciferol to diets containing added zinc decreased the levels of plasma isoleucine, leucine, threonine and lysine. Lysine in plasma was also decreased by calciferol supplementation of the low protein diet and by the addition of zinc to this diet. Xanthine oxidase activity was lowest in animals fed the low protein diet without calciferol and zinc. The apparent interaction between zinc and vitamin D closely approached significance at the 5% level. The results indicated that xanthine oxidase activity in animals fed low protein decreased with increased plasma lysine, which was observed in animals maintained without dietary sources of zinc and calciferol.

1 Scientific series paper no. 1382 published with the approval of the Director of the Colorado Agricultural Experiment Station.

2 Supported in part by National Institutes of Health Training Grant no. GMS 1274 and by funds from Regional Project W-57 of the Western Agricultural Experiment Stations.

Manuscript received 27 December 1968.




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