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Effects of Dietary Protein Concentration on Trace Minerals in Rat Tissues at Different Ages¹

Department of Foods and Nutrition, University of Illinois, Urbana, IL 61801 ^* Human Nutrition Laboratory, Department of Human Development and Consumer Sciences, University of Houston, Houston, TX 77004

Copper, iron and zinc concentrations were measured in tissues of young (2 mo), mature (14 mo) and aged (26 mo) male Fischer rats fed either a normal protein (16% casein) or high protein (32% casein) diet for 30 d. Spleen copper concentrations decreased with maturity but were not affected by dietary protein level. Age, dietary protein and age x protein interaction affected spleen iron concentrations. Splenic iron was increased significantly only in mature and aged rats fed the normal protein diet. High protein-fed aged rats had decreased splenic zinc. High protein feeding increased renal zinc in the young and aged rats compared to normal protein feeding. At both protein levels, liver iron increased in the mature rats. Upon aging, zinc levels in the heart increased in the normal protein group and decreased in the high protein group. A significant interaction between age and protein was observed on heart zinc. Thus, the concentrations of tissue trace minerals are affected by age, dietary protein and protein x age interaction in young, mature and aged male rats.

KEY WORDS: • aging • iron • copper • zinc • high dietary protein

¹ This research was supported by National Institutes of Health Grants AGO-2396 to I. W. and HD 15515 to A. R. S. and a University of Illinois College of Agriculture Hunter Fellowship to L. H.

Manuscript received 11 September 1984.

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