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Safety and Metabolic Effects of L-Glutamine Administration in Humans
Thomas R. Ziegler, M.D.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Kathleen Benfell, R.PH.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Robert J. Smith, M.D.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Lorraine S. Young, R.D., M.S.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Elaine Brown, M.S.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Elisabetta Ferrari-Baliviera, M.D.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Daniel K. Lowe, M.D.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
Douglas W. Wilmore, M.D.
Laboratory of Surgical Metabolism and Nutrition, Departments of Surgery and Medicine, Brigham and Women's Hospital, and the Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts
A series of dose-response studies was conducted to evaluate the clinical safety, pharmacokinetics, and metabolic effects of L-glutamine administered to humans. Initial studies in normal individuals evaluated the short-term response to oral loads of glutamine at doses of 0, 0.1, and 0.3 g/kg. A dose-related increase in blood glutamine occurred after oral loading and elevation of amino acids known to be end products of glutamine metabolism occurred (including alanine, citrulline, and arginine). No evidence of clinical toxicity or generation of toxic metabolites (ammonia and glutamate) was observed. Glutamine was infused intravenously in normal subjects over 4 hr at doses of 0.0125 and 0.025 g/kg/hr. In addition, glutamine was evaluated as a component of parenteral nutrition solutions (0.285 and 0.570 g/kg/day) administered for 5 days to normal subjects. Intravenous administration of glutamine was well tolerated without untoward clinical or biochemical effects. Subsequent studies in patients receiving glutamine-enriched parenteral nutrition for several weeks confirmed the clinical safety of this approach in a catabolic patient population. In addition, nitrogen retention appeared to be enhanced when glutamine was administered at a dose of 0.570 g/kg/day in a balanced nutritional solution providing adequate calories (145% of basal) and protein (1.5 g/kg/day). Nitrogen balance in patients receiving lower doses of glutamine (0.285 g/kg/day) was similar to that in patients receiving standard formulations. Further controlled clinical trials of the metabolic efficacy, tolerance, and dose response of glutamine in other patient groups are necessary to determine the appropriate use of glutamine enrichment of nutrient solutions. (Journal of Parenteral and Enteral Nutrition 14:137S-146S, 1990)
Journal of Parenteral and Enteral Nutrition, Vol. 14, No. 4 Suppl,
137S-146S (1990)
DOI: 10.1177/0148607190014004201
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