Abstract

Children suffering from acute lymphoblastic leukemia (ALL) possess an increased concentration of cytidine triphosphate (CTP) in their lymphoblasts compared to resting lymphocytes.1 This might be due to either an enhanced flux through the pyrimidine “de novo” and/or uridine salvage pathway or to an increased flux through the cytidine salvage pathway. By studying ribonucleotide fluxes in a MOLT-3 lymphoblastic cell line it has been shown that the increased CTP concentration is the result of an enhanced activity of CTP synthetase (CTPS).2 We now analyzed the “in vitro” CTPS activity in lymphoblasts of children with ALL. If increased, CTPS might be inhibited by drugs like cyclopentenylcytosine (CPEC).

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