title: Metabolism of pyrimidine L-nucleosides.
abstract: The intraperitoneal application of L-nucleosides (L-Cyd, L-Urd, L-dThd) to mice results in distribution of these compounds into tissues of the organism and their gradual excretion in the unchanged form. The residual level has been observed with L-ribonucleosides only and contains in addition to the L-nucleoside its 5'-phosphate. The phosphorylation in vivo is catalyzed by nucleoside-kinase and utilizes ATP as the phosphate donor while glycerol 1-phosphate and creatine phosphate are inactive. The L-cytidine derivatives are in vivo deaminated to the derivatives of L-uridine. On the other hand, when L-uridine is applied in vivo, derivatives of L-cytidine are obtained on the level of both the nucleoside and 5'-ribonucleotide.
mesh_terms: D000818:Animals; D003562:Cytidine / Q000378:metabolism; D007700:Kinetics; D008099:Liver / Q000378:metabolism; D051379:Mice; D009928:Organ Specificity; D011741:Pyrimidine Nucleosides / Q000378:metabolism*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013936:Thymidine / Q000378:metabolism; D014529:Uridine / Q000378:metabolism
chemical_list: D011741:Pyrimidine Nucleosides; D003562:Cytidine; D013936:Thymidine; D014529:Uridine