The uptake of radioactive l-phenylalanine and l-tyrosine into the tissue water of rat brain cerebral cortex slices was shown to have saturation kinetics. The apparent Km for the uptake of l-phenylalanine was 0.86mm and for l-tyrosine was 1.64mm; for phenylalanine the apparent Vmax. value was 0.64μmol/min per ml of tissue water, and for l-tyrosine it was 0.98μmol/min per ml of tissue water. The accumulation of the two amino acids by the tissue was depressed in the absence of O2, at 0°C, or in the presence of metabolic inhibitors. The influxes and effluxes of both l-isomers were more rapid than those of the d-isomers. Competition between these two amino acids and each with l-tryptophan in respect of uptake into tissue water was shown. Their rates of influx were faster, and rates of efflux were slower, in the presence than in the absence of Na+. It was concluded that these amino acids were taken up by active transport via a carrier mechanism.
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Research Article|
September 15 1973
The uptake and efflux of l-phenylalanine and l-tyrosine from rat brain cerebral cortex slices
Pierre Joanny;
Pierre Joanny
Laboratoire de Physiologie, Faculté de Medicine Sud, Bd. Jean Moulin, 13, Marseille 5e, France, and the Unity Laboratory, Department of Biological Sciences, University of Surrey, Guildford, Surrey, U.K.
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Jean-Pierre Natali;
Jean-Pierre Natali
Laboratoire de Physiologie, Faculté de Medicine Sud, Bd. Jean Moulin, 13, Marseille 5e, France, and the Unity Laboratory, Department of Biological Sciences, University of Surrey, Guildford, Surrey, U.K.
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Harold Hillman;
Harold Hillman
Laboratoire de Physiologie, Faculté de Medicine Sud, Bd. Jean Moulin, 13, Marseille 5e, France, and the Unity Laboratory, Department of Biological Sciences, University of Surrey, Guildford, Surrey, U.K.
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Jacques Corriol
Jacques Corriol
Laboratoire de Physiologie, Faculté de Medicine Sud, Bd. Jean Moulin, 13, Marseille 5e, France, and the Unity Laboratory, Department of Biological Sciences, University of Surrey, Guildford, Surrey, U.K.
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Publisher: Portland Press Ltd
© 1973 The Biochemical Society
1973
Biochem J (1973) 136 (1): 77–82.
Citation
Pierre Joanny, Jean-Pierre Natali, Harold Hillman, Jacques Corriol; The uptake and efflux of l-phenylalanine and l-tyrosine from rat brain cerebral cortex slices. Biochem J 15 September 1973; 136 (1): 77–82. doi: https://doi.org/10.1042/bj1360077
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