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1

Effect of levetiracetam on penicillin induced epileptic activity in rats

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Arik A. E., Bagirici F., Sefil F., Marangoz C.
Acta Neurobiologiae Experimentalis
|
2014
|
tom 74
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nr 3
The aim of this study was to investigate the effects of levetiracetam (LEV) on penicillin- induced epileptiform activity in rats. Penicillin was applied intracerebroventricularly (icv) at a dose of 500 IU to induce epileptiform activity. LEV was given intraperitoneally (ip) at doses of 20, 40, 80 mg/kg before penicillin injection. This agent reduced epileptiform activity by decreasing spike frequencies. The mean spike frequencies decreased significantly in all the LEV treated groups. There was no significant change in the spike amplitudes of the LEV groups compared with the control group. 40 mg/kg of LEV was determined as the most effective dose on reducing epileptiform activity. The results of this study suggest that LEV is an effective antiepileptic agent in penicillin-induced epilepsy.
2

Influence of carbenoxolone on the anticonvulsant efficacy of phenytoin in pentylenetetrazole kindled rats

100%
Sefil F., Bagirici F., Acar M. D., Marangoz C.
Acta Neurobiologiae Experimentalis
|
2012
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tom 72
|
nr 2
Abnormal synchronized neuronal discharges mediated by gap junctions have an important role in epileptic seizures. The analysis of anticonvulsant drugs acting on gap junctions is still a priority in epilepsy research. Therefore, the present study was designed to investigate the effect of carbenoxolone, a gap junction blocker, on the anticonvulsant efficacy of phenytoin in pentylenetetrazol kindled rats. Male Wistar albino rats, 14 weeks of age, were used. In the first step of the study, animals were given PTZ 35 mg/kg intraperitoneally (i.p.) three times a week until kindling was produced. Then, indwelling screw electrodes - allowing EEG monitoring of conscious rats - were implanted into the crania of the kindled rats. In this way, we were able to record EEG activity and evaluate seizure stage at the same time. In the second step of the study, the interaction between carbenoxolone (40 mg/kg i.p.) and phenytoin (60 mg/kg, i.p.) was investigated. The data analysis was performed using a one-way ANOVA with LSD post-hoc test. Total spike number and the generalized seizure duration were reduced in the carbenoxolone treated group compared to the PTZ group. Phenytoin decreased generalized seizure duration, total spike number and seizure severity score. Carbenoxolone and phenytoin have anti-seizure effects in PTZ kindled rats. There was no significant difference between the carbenoxolone + phenytoin combination and phenytoin in terms of generalized seizure duration, total spike number and seizure stage. The results indicate that carbenoxolone combined with phenytoin is not more effective than the use of these drugs alone.
3

The interactions of nitric oxide and adenosine on penicillin-induced epileptiform activity in rats

88%
Yildirim M., Marangoz A. H., Ayyildiz M., Ankarali S., Marangoz C.
Acta Neurobiologiae Experimentalis
|
2011
|
tom 71
|
nr 2
In this study, the influence of nitric oxide (NO) and adenosine systems on penicillin-induced epileptiform activity was examined in rats. NO donor, sodium nitroprusside (SNP, 50 ^g/rat, i.c.v.) reduced the frequency but not the amplitude of epileptiform discharges. Non-selective NOS inhibitor, N-omega-nitro-L-arginine methyl ester (L-NAME, 100 ^g/rat, i.c.v.) practically did not exert any effect on the spike frequency and amplitude. Adenosine (100 ^g/rat, i.c.) reduced spike frequency but not the amplitude, whereas theophylline (100 ^g/rat, i.c.v.) increased the mean spike frequency and amplitude of penicillin-induced epileptiform discharges. Co-injection of theophylline and L-NAME did not cause a further increase in the epileptiform activity compared with theophylline. When NO production was blocked with L-NAME, the inhibitory effects of adenosine were lost. The obtained results suggest that NO and adenosine may decrease penicillin-induced epileptiform activity in rats and that NO, at least in part, may mediate the anticonvulsant effect of adenosine.
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