Abstract
Background and Objectives
Whole-body radiation exposure has been shown to alter the pharmacokinetics of certain drugs in both animal models and humans, but little is known about the effect of radiation on psychoactive medications. These drugs may have altered pharmacokinetics when administered during or after space travel or therapeutic or accidental radiation exposure, resulting in reduced efficacy or increased toxicity.
Methods
Methamphetamine was used to determine the effects of acutely administered 1, 3, and 6 Gy radiation on drug pharmacokinetics and pharmacodynamics. Male Wistar rats were exposed to 0, 1, 3, or 6 Gy X-ray radiation on day 0. The serum pharmacokinetics of subcutaneously administered 1 mg/kg methamphetamine was determined on day 3. Methamphetamine-induced (1 mg/kg) locomotor activity was measured on day 5. Brain methamphetamine concentrations were determined 2 h after methamphetamine administration (1 mg/kg) on day 6. Renal and hepatic serum biomarkers were assessed on days 3 and 6, with liver histology performed on day 6.
Results
While serum half-life and unchanged methamphetamine urine clearance were unaffected by any radiation dose, maximum methamphetamine concentrations and methamphetamine and amphetamine metabolite area under the serum concentration–time curve values from 0 to 300 min were significantly reduced after 6 Gy radiation exposure. Additionally, methamphetamine-induced locomotor activity and the brain to serum methamphetamine concentration ratio were significantly elevated after 6 Gy radiation.
Conclusions
While 1–6 Gy radiation exposure did not affect methamphetamine elimination, 6 Gy exposure had effects on both subcutaneous absorption and brain distribution. These effects should be considered when administering drugs during or after radiation exposure.
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This work was supported by the NASA WV EPSCoR Research Seed Grant.
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The authors have no conflicts of interest to disclose.
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Rat use for these experiments was approved by the Marshall University Institutional Animal Care and Use Committee (Protocol #717), and was conducted in accordance with the Guide for the Care and Use of Laboratory Animals as adopted by the National Institutes of Health.
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The data in the current study are available from the corresponding author on reasonable request.
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Data collection (MRM, DLF, AM, AP, LC, GG, MDH), data analysis (MRM, EUY, FDA, ERB, GG, MDH), funding (ERB, MDH), experimental design (MRM, ERB, GG, MDH).
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McGill, M.R., Findley, D.L., Mazur, A. et al. Radiation Effects on Methamphetamine Pharmacokinetics and Pharmacodynamics in Rats. Eur J Drug Metab Pharmacokinet 47, 319–330 (2022). https://doi.org/10.1007/s13318-022-00755-y
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DOI: https://doi.org/10.1007/s13318-022-00755-y