Title : Biochemical modulation of 5-fluorouracil with leucovorin or delayed uridine rescue. Correlation of antitumor activity with dosage and FUra incorporation into RNA.

Pub. Date : 1992 Jun 23

PMID : 1378737






4 Functional Relationships(s)
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1 Inhibition of TSase by FUra was modulated by leucovorin (LV), and the incorporation of FUra into RNA was increased by the administration of otherwise lethal doses of FUra followed by uridine "rescue". Fluorouracil thymidylate synthase Mus musculus
2 Thymidylate synthase activity was inhibited substantially (49%) by low-dose FUra at 25 mg/kg, but was not further enhanced (48%) by repeated daily treatments at the same dose (FUra25 x 4). Fluorouracil thymidylate synthase Mus musculus
3 FUra as a single agent at the maximum tolerated weekly dose of 100 mg/kg inhibited TSase activity 66-73%. Fluorouracil thymidylate synthase Mus musculus
4 At a very-high-dose of FUra (200-225 mg/kg) followed by uridine "rescue", TSase inhibition was not further enhanced, but both (FU)RNA (4.8 nmol/mg DNA) and the therapeutic efficacy were increased. Fluorouracil thymidylate synthase Mus musculus