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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Effect of 5-fluoro-2'-deoxyuridine and hydroxyurea on the phytohemagglutinin-induced increase of thymidine kinase, replicative DNA polymerase, deoxycytidylate deaminase and CDP reductase activities in human lymphocytes.

The inhibitors of DNA synthesis, 5-fluoro-2'-deoxyuridine and hydroxyurea, caused an inhibition of thymidine kinase, replicative DNA polymerase and CDP reductase activities in stimulated lymphocytes when they were exposed to the inhibitors during the early transformation period (0-17 hr). However, the enzyme activities were unaffected when the inhibitors were added to cells stimulated for more than 17 hr. As opposed to these enzymes the deoxycytidylate deaminase activity was unaffected by the inhibitors during the entire transformation period (0-28 hr). This indicates a close regulatory mechanism in lymphocytes between DNA synthesis and induction of enzymes involved in DNA replication. The inhibitory mechanism exerted by the inhibitors is for the moment unknown. It might be independent of the well-known inhibition of the target enzymes, thymidylate synthetase and ribonucleoside diphosphate reductase, since there was no immediate apparent correlation in time between depletion of the pool sizes and the inhibition of the enzyme activities.[1]

References

  1. Effect of 5-fluoro-2'-deoxyuridine and hydroxyurea on the phytohemagglutinin-induced increase of thymidine kinase, replicative DNA polymerase, deoxycytidylate deaminase and CDP reductase activities in human lymphocytes. Tyrsted, G. Mol. Cell. Biochem. (1984) [Pubmed]
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