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Influences of caffeine to nitric oxide production and zonisamide concentration in the brain of seizure‐susceptible EL mice

Abstract To investigate changes of nitric oxide (NO) productions and zonisamide (ZNS) concentrations in the brain of seizure‐susceptible EL mice given caffeine orally, mice were given caffeine (600 μg/mL) solution ad libitum as a drinking fluid for 1–3 weeks. Nitric oxide production in the brain was determined by measuring levels of nitrite plus nitrate (NOx). The brain NOx levels of mice treated with caffeine for 3 weeks were significantly higher than the control. Seizures in mice treated with caffeine for 2 and 3 weeks were not suppressed by ZNS at a dose of 75 mg/kg. Serum ZNS concentrations of mice with caffeine intake for 1–3 weeks were higher than in untreated mice. Conversely, brain ZNS concentrations of mice with caffeine intake for the same periods were significantly lower than in untreated mice. These results suggested that caffeine influenced brain NO production and ZNS concentrations in the seizure susceptibility of EL mice.