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  • Title: Contribution by host tissues to circulating glutamine in mice inoculated with Ehrlich ascites tumor cells.
    Author: Quesada AR, Medina MA, Márquez J, Sánchez-Jiménez FM, Núñez de Castro I.
    Journal: Cancer Res; 1988 Mar 15; 48(6):1551-3. PubMed ID: 2894241.
    Abstract:
    Twenty-four h after tumor transplantation increases of free glutamine in plasma, liver, and kidney occurred simultaneously with the exponential phase of tumor growth. Kidney and muscle glutamine synthetase also increased in the first 2 days following tumor transplantation, while kidney and liver glutaminases decreased. The levels of free glutamine in plasma and tissues, and the activities of glutamine synthetase and glutaminase, tended to approach normal values in the last days of life of the tumor-transplanted animals. Eleven days after transplantation, liver glutamine synthetase activity diminished. The results are discussed in terms of a glutamate/glutamine intercellular cycle which could augment the circulating glutamine, the main source of nitrogen for tumor cells.
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