Quantitation of 6-thioguanine in peripheral blood leukocyte DNA in Crohn's disease patients on maintenance 6-mercaptopurine therapy

C. Cuffari, E. G. Seidman, S. Latour, Y. Théorêt

Research output: Contribution to journalArticle

Abstract

The effects of 6-mercaptopurine (6MP) in inflammatory bowel disease are believed to be primarily mediated by its metabolite 6-thioguanine (6TG). Our aim was to develop an assay for measuring leukocyte DNA 6TG levels in patients with Crohn's disease, and to correlate them with levels of 6TG in erythrocytes. Heparinized blood was obtained from 15 adolescent Crohn's disease patients receiving 6MP at an average dose of 1.3 mg · kg-1 · day-1 (range 0.8-1.6 mg · kg-1 · day-1) for a mean of 23.7 months (range 3-71 months). Leukocyte DNA and erythrocyte 6TG levels were measured by an HPLC assay. Leukocyte 6TG levels ranged from 100 to 2305 pmol/mg DNA, while erythrocyte 6TG levels ranged from 64 to 1038 pmol/8 x 108 red blood cells, demonstrating significant interpatient variability. Leukocyte DNA 6TG levels correlated directly with erythrocyte 6TG levels, as measured by the Spearman rank correlation coefficient (p < 0.05). The HPLC measurement of erythrocyte and leukocyte DNA 6TG levels can be useful clinically in monitoring compliance, as well as perhaps to tailor drug metabolite levels to achieve the desired clinical effect.

Original languageEnglish (US)
Pages (from-to)580-585
Number of pages6
JournalCanadian Journal of Physiology and Pharmacology
Volume74
Issue number5
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

Keywords

  • 6-Mercaptopurine metabolism
  • HPLC
  • Inflammatory bowel disease

ASJC Scopus subject areas

  • Physiology
  • Pharmacology
  • Physiology (medical)

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