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1 results

  • Impairment of cysteine synthesis from methionine in rats exposed to surgical stress

  • José Viña, Angel Gimenez, Inmaculada R. Puertes, Esperanza Gasco, Juan R. Viña
  • Journal:
    British Journal of Nutrition / Volume 68 / Issue 2 / September 1992
    Published online by Cambridge University Press:
    09 March 2007, pp. 421-429
    Print publication:
    September 1992
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  • The activity of liver cystathionase (EC 4.4.1.1) was decreased after 3 d of stress induced by surgery. The rate of l-cysteine synthesis from l-methionine was significantly higher in isolated hepatocytes from controls than in hepatocytes from rats suffering from surgical stress. The half-life of l-[2(n)-3H]methionine was significantly higher in rats submitted to surgical stress than in controls. Plasma l-methionine: l-cystine ratio was higher in stressed rats than in controls. l-cystine uptake was significantly increased in the surgically-stressed rats when compared with the controls. All these facts are consistent with the hypothesis that the observed inhibition of cystathionase is physiologically important and thatl-cysteine might be considered as an essential amino acid in cases of surgical stress.