Deoxyribocytidine is salvaged not only into DNA but also into phospholipid precursors. IV. Exogenous deoxyribocytidine can be used with the same efficacy as (ribo)cytidine for lipid activation.
Utilisation of exogenous (ribo)cytidine (3H-CR) and deoxyribocytidine (3H-CdR) for DNA/RNA synthesis and for activation of phospholipid intermediates was compared in human tonsillar lymphocytes. Incorporation of 3H-CdR into dCDP-choline and into dCDP-DAG was similar or even higher than labelling of CDP-choline and CDP-DAG from 3H-CR. No interconversion was found between CDP-DAG and dCDP-DAG, as shown by TLC separation of the ribo- and deoxyribocytidine derivatives. Moreover, a strict separation was found between the salvage pathways of deoxyribocytidine and (ribo)cytidine, as 4000-fold excess of non labelled (ribo)cytidine did not show any specific effect on 3H-dCDP-DAG labelling from exogenous 3H-CdR.
Sasvári-Székely
M
M
1st Institute of Biochemistry, Semmelweis Medical University, Budapest, Hungary.
Spasokukotskaja
T
T
Staub
M
M
D002478:Cells, Cultured; D003562:Cytidine / Q000378:metabolism*; D004247:DNA / Q000096:biosynthesis*; D003841:Deoxycytidine / Q000378:metabolism*; D006801:Humans; D007700:Kinetics; D008214:Lymphocytes / Q000378:metabolism*; D008954:Models, Biological; D014066:Palatine Tonsil; D010743:Phospholipids / Q000096:biosynthesis* / Q000302:isolation & purification; D013936:Thymidine / Q000378:metabolism*; D014316:Tritium
D010743:Phospholipids; D003841:Deoxycytidine; D014316:Tritium; D003562:Cytidine; D004247:DNA; D013936:Thymidine