Effects of intracellular calcium chelation and pifithrin-α on deoxynucleotide metabolism in human lymphocytes

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Abstract

Previously, we have found that activation of deoxycytidine kinase elicited by various DNA-damaging chemical agents could be prevented by BAPTA-AM, a cell-permeable calcium chelator or by pifithrin-α, a pharmacological inhibitor of p53. Here, we show that stimulation of deoxycytidine kinase by UV-light also is calcium-dependent and pifithrin-α-sensitive in tonsillar lymphocytes, while thymidine kinase 1 activity is stabilised in the presence of BAPTA-AM. Importantly, both UV-irradiation and calcium chelation decreased the incorporation of labelled deoxycytidine and thymidine into DNA. Pifithrin-alpha dramatically reduced the labelling of both the nucleotide and DNA fractions, possibly due to inhibition of transmembrane nucleoside transport.

Original languageEnglish
Pages (from-to)1181-1184
Number of pages4
JournalNucleosides, Nucleotides and Nucleic Acids
Volume25
Issue number9-11
DOIs
Publication statusPublished - Jun 1 2006

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Keywords

  • BAPTA-AM
  • Deoxycytidine kinase
  • Enzyme activation
  • Metabolic labelling
  • Pifithrin-α

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Genetics

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