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Immediate Stimulation of Protein Metabolism in Burned Rats by Total Parenteral Nutrition Enriched in Branched-Chain Amino Acids

Trauma and Critical Care Center, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan

Masaharu Hasebe, M.D.

Trauma and Critical Care Center, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan

Kunio Kobayashi, M.D.

Trauma and Critical Care Center, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan

Hiromasa Suzuki, M.D.

Trauma and Critical Care Center, Teikyo University School of Medicine, Itabashi-ku, Tokyo, Japan

The effects of two kinds of total parenteral nutrition (TPN) on energy and protein metabolism were examined in rats subjected to 15% full-thickness scald burns in the absence of septic complications. One type of TPN was enriched in branched-chain amino acids (BCAAs), especially leucine (45% BCAA content), and the other was conventional TPN (21% BCAA content). Burned rats received isocaloric and isonitrogeneous TPN solutions for 48 hr after resuscitation by saline infusion for 24 hr. Liver and rectus abdominis muscle were removed from the rats at 7, 24, 48, and 72 hr. The concentrations of adenine nucleotides, RNA, protein, glucose-6-phosphate, hepatic glycogen, muscle phosphocreatine, and 3-methylhistidine were determined. Metabolic alterations occurred during the period of saline resuscitation (0-24 hr). At 48 hr the RNA and protein levels were significantly more improved in the BCAA-TPN group than in the conventional TPN group. At 72 hr, however, the results for the two groups were similar in most metabolite levels. Thus, BCAA-TPN enriched in leucine rapidly stimulated protein synthesis in the liver and muscle. This rapid effect may make it useful during the initial nutritional management of severe trauma patients. (Journal of Parenteral and Enteral Nutrition 13:484-489,1989)

Journal of Parenteral and Enteral Nutrition, Vol. 13, No. 5, 484-489 (1989)
DOI: 10.1177/0148607189013005484


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