Chronotoxicity of methotrexate in mice and its relation to circadian rhythm of DNA synthesis and pharmacokinetics

Japanese Journal of Pharmacology
S OhdoN Ogawa

Abstract

The mechanisms underlying the circadian rhythm of methotrexate (MTX)-induced toxicity (body weight loss and leukopenia) were investigated from the viewpoints of the sensitivity of living organisms to the drug and the pharmacokinetics of the drug. ICR male mice were housed in a standardized light-dark cycle (lights on at 0700, off at 1900) with food and water ad libitum. The body weight loss after an intraperitoneal injection of MTX (400 mg/kg) was more serious in the late dark period and the early light period and milder in the late light period and the early dark period. The MTX-induced leukopenia was more serious in the late dark period and the light period and milder in the early dark period. Lower toxicity was observed when DNA synthesis, dihydrofolate reductase (DHFR) activity in bone marrow cells and folate level in plasma decreased, and higher toxicity was observed when they increased. There was a significant circadian rhythm in plasma MTX concentration, with a higher level in the light period and a lower level in the dark period. The circadian rhythm of plasma MTX concentration was associated with that of MTX-induced toxicity. The present study suggests that the circadian rhythm of MTX-induced toxicity is caused by that...Continue Reading

Citations

Jan 9, 2010·Annual Review of Pharmacology and Toxicology·Francis LéviJean Clairambault
Jan 4, 2003·Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan·Shigehiro Ohdo
Jun 7, 2006·Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan·Hideto To
Sep 24, 2019·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·Mengjing ZhaoBaojian Wu
Apr 2, 2011·Chronobiology International·Hideto ToKatsumi Eguchi
Aug 10, 2021·Chronobiology International·Nidhi NagariyaVihas T Vasu

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