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The effect of abolition of the endogenous corticosteroid rhythm on the circadian variation in methotrexate toxicity in the rat

  • Original Articles
  • Biological rhythms, Methotrexate, Chromopharmacology, Corticosteroids
  • Published:
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Summary

Monitoring of indices of haematological, renal and hepatic toxicity in rats after a single i.v. bolus of methotrexate has shown that they vary with the time of day at which the drug is administered. Maximum toxicity occurs after administration at 0600 h. Further experimentation has shown that the amount of corticosteroid present in the blood has a profound effect on the toxicity of methotrexate in the rat. If the endogenous production of corticosterone is suppressed by treatment with dexamethasone the toxicity of methotrexate is markedly increased at whatever clock time it is administered. However, if constantly high plasma levels are achieved by giving supplementary corticosterone methotrexate toxicity is diminished regardless of what time it is given.

Since the timing of maximum methotrexate toxicity corresponds to the circadian nadir of endogenous plasma corticosterone concentration in the rat the possibility that it might be related to corticosterone production must be considered. Whether this phenomenon occurs in man and has any clinical relevance has yet to be investigated.

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Authors and Affiliations

  1. Department of Biochemistry, University of Surrey, GU2 5XH, Guilford, Surrey, U. K.

    Judie English, G. Wynne Aherne, Jo Arendt & Vincent Marks

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  1. Judie English
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  2. G. Wynne Aherne
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  3. Jo Arendt
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  4. Vincent Marks
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English, J., Wynne Aherne, G., Arendt, J. et al. The effect of abolition of the endogenous corticosteroid rhythm on the circadian variation in methotrexate toxicity in the rat. Cancer Chemother. Pharmacol. 19, 287–290 (1987). https://doi.org/10.1007/BF00261474

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  • DOI: https://doi.org/10.1007/BF00261474

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