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- W2080552207 abstract "Human lymphocytes lacking adenosine deaminase die and T-cell leukemias are killed by deoxycoformycin (dCf), an inhibitor of adenosine deaminase, due to impaired metabolism of dAdo. The initial metabolism of exogenous adenosine (Ado) and deoxyadenosine (dAdo) has been compared in human erythrocytes and CCRF-CEM leukemia cells and the data obtained have been simulated using kinetic constants obtained in vitro for the enzymes involved. Cells were mixed with 3H-labelled Ado and dAdo, samples were taken at 3 sec intervals and progress curves for the 3H-labelled metabolites formed were determined by quantitative two-dimensional thin layer chromatography. Erythrocytes rapidly take up Ado and the predominant metabolite after 60 sec is hypoxanthine (Hyp), while for dAdo, deoxyinosine (dIno) predominates. By contrast, leukemia cells convert to Ado predominantly to AMP, while dAdo is converted first to Hyp and the to AMP. The presence of dCf had little effect upon Ado metabolism by induced accumulation of dAdo. Erythrocytes rapidly degrade Ado and dAdo to Hyp, although the phosphorolysis of dIno is relatively slow. Human CCRF-CEM leukemia cells convert most of the Ado or dAdo to AMP after 60 sec. For dAdo, the sequence of reactions would be dAdo-->dIno-->Hyp-->IMP-->sAMP-->AMP. dCf does not significantly affect the conversion of Ado-->AMP, but dCf blocks AMP accumulation from dAdo, consistent with the reaction sequence shown above. A computer model has been developed for the metabolism of Ado and dAdo, but some of the kinetic constants determined in vitro for this model do not pertain to intact cells." @default.
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- W2080552207 date "1996-12-01" @default.
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- W2080552207 title "Metabolism of adenosine and deoxyadenosine by human erythrocytes and CCRF-CEM leukemia cells" @default.
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- W2080552207 doi "https://doi.org/10.1016/s1357-2725(96)00080-5" @default.
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