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• W2131429687 abstract "The present study was conducted to identify the role of nitric oxide (NO) in the anticonvulsant effects of pyridoxine hydrochloride on penicillin-induced epileptiform activity in rats. A single microinjection of penicillin (500 units) into the left sensorimotor cortex induced epileptiform activity within 2–4 min, progressing to full seizure activity lasting about 3–5 h. Thirty minutes after penicillin injection, 20, 40, 80, and 160 mg/kg of pyridoxine hydrochloride was administered intraperitoneally (i.p.). Pyridoxine significantly reduced the frequency of penicillin-induced epileptiform activity. A low dose of pyridoxine (40 mg/kg) was the most effective in reducing both the frequency and amplitude of epileptiform activity. The effect of systemic administration of nitric oxide synthase (NOS) inhibitors, non-selective NG-nitro-l-arginine methyl ester (l-NAME), selective neuronal NOS inhibitor, 7-nitroindazole (7-NI) and NO substrate, l-arginine on anticonvulsive effects of pyridoxine was investigated. The administration of l-arginine (500 mg/kg, i.p.) and 7-NI (25 and 50 mg/kg, i.p.) significantly decreased the frequency of epileptiform electrocorticographical (ECoG) activity while administration of l-NAME (60 mg/kg, i.p.) and the inactive form of arginine (d-arginine) did not influence it. The administration of l-NAME (60 mg/kg, i.p.) 15 min before pyridoxine (40 mg/kg i.p.) application reversed the anticonvulsant effects of pyridoxine whereas 7-NI (25 and 50 mg/kg, i.p.) did not influence it. The same dose of its inactive enantiomer NG-nitro-d-arginine methyl ester (d-NAME) failed to reverse the anticonvulsant effects of pyridoxine. The administration of l-arginine (500 mg/kg, i.p.) did not affect the frequency of epileptiform ECoG activity in the pyridoxine administered group. l-Arginine did not reverse the anticonvulsant effect of 7-NI in the penicillin and pyridoxine administered groups. The results of present study indicate that the inhibitory effect on the anticonvulsant activity of pyridoxine against penicillin-induced epileptiform activity was produced by l-NAME, not by 7-NI, and is probably not related to the decrease of NOS activity in the brain." @default.
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• W2131429687 date "2007-08-01" @default.
• W2131429687 modified "2023-10-18" @default.
• W2131429687 title "The role of nitric oxide in the anticonvulsant effects of pyridoxine on penicillin-induced epileptiform activity in rats" @default.
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• W2131429687 doi "https://doi.org/10.1016/j.eplepsyres.2007.06.011" @default.
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