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  • Title: [Changes in plasma free amino acid concentrations in rats during sepsis].
    Author: Wu Y, Chai J, Li J.
    Journal: Zhonghua Wai Ke Za Zhi; 2001 Aug; 39(8):638-42. PubMed ID: 11758208.
    Abstract:
    OBJECTIVE: To explore the relationship between plasma free amino acid concentrations and skeletal muscle proteolysis in rats during sepsis. METHODS: An animal model of sepsis in rats was established by administering endotoxin into the peritoneal cavity. The plasma concentrations of free amino acid, ALT, AST, cortisol, TNF-alpha and IL-6 were determined. The rats were randomly divided into normal control, 2, 6, 12 and 24 h groups after administration of endotoxin(8 rats for each group). RESULTS: The total plasma free amino acids concentrations fluctuate within normal range within 24 h after administration of endotoxin. A marked decrease in BCAA (branch-chainamino acid) was observed at 2, 6 and 12 h after administration of endotoxin, but aromatic amino acids (AAA) increased in varying degrees. BCAA/AAA was lower at 2 h and 6 h as compared with that of the normal control, while Phe/Tyr increased obviously at every time point. Lys, Sar, Cys and P-Ser showed no significant changes within 24 h after the administration of endotoxin. Thr, Glu, Orn, His, 3-MH and Ala increased during sepsis, and other amino acids more or less decreased. Plasma concentrations of ALT, AST, cortisol, TNF-alpha and IL-6 obviously increased within 24 h after the administration of endotoxin(P < 0.01). Cortisol peaked at 6 h and IL-6 peaked at 12 h, while TNF-alpha at 2 h. CONCLUSION: The results suggested that metabolic disorder of plasma free amino acids during sepsis is due to enhancement of skeletal muscle proteolysis and liver overloading.
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