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Journal of Parenteral and Enteral Nutrition
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Supplemental Arginine and Ornithine Do Not Affect Splenocyte Proliferation in Surgically Treated Rats

Patrick M. Torre, PHD

Amino Acid Metabolism Laboratory, United States Department of Agriculture-Agricultural Research Service, Human Nutrition Research Center on Aging at Tufts University, Boston

Alayne G. Ronnenberg, MS, RD

Amino Acid Metabolism Laboratory, United States Department of Agriculture-Agricultural Research Service, Human Nutrition Research Center on Aging at Tufts University, Boston

Wilburta J. Hartman, PHD

Amino Acid Metabolism Laboratory, United States Department of Agriculture-Agricultural Research Service, Human Nutrition Research Center on Aging at Tufts University, Boston

Ronald L. Prior, PHD

Amino Acid Metabolism Laboratory, United States Department of Agriculture-Agricultural Research Service, Human Nutrition Research Center on Aging at Tufts University, Boston

The present study was designed to determine whether arginine or ornithine supplementation enhanced immune responsiveness in surgically stressed rats. Young rats (130 to 150 g; n = 72) were fed one of three nonpurified diets: control, arginine-supplemented (30 g/kg of diet), or supplemented with ornithine on an equimolar basis to supplemental arginine. Control and ornithine-supplemented diets were made isonitrogenous to the arginine-supplemented diet with alanine. Food intake and body weight were monitored throughout the experimental period. Eight days after initiation of dietary treatments, 36 rats were given dorsal skin wounds. Rats were killed 7 days later. Blood was collected, spleen and thymus were weighed, and splenocytes were isolated to measure proliferation in response to mitogens and interleukin-2 production. Food intake, body weight gain, and thymus weight were lower in rats subjected to surgery than in control rats (p < .01). Neither supplemental dietary arginine nor ornithine affected food intake, body weight gain, thymus weight, splenocyte proliferation, or splenocyte interleukin-2 production in any treatment group (p < .1). These data suggest that low-level dietary supplementation of arginine and ornithine did not ameliorate detrimental effects of minor surgery in rats. (Journal of Parenteral and Enteral Nutrition 17:532-536, 1993)

Journal of Parenteral and Enteral Nutrition, Vol. 17, No. 6, 532-536 (1993)
DOI: 10.1177/0148607193017006532
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