Effect of GABA(B) receptor agonist SKF97541 on cortical and hippocampal epileptic afterdischarges.

نویسندگان

  • P Fábera
  • P Mareš
چکیده

Activation of GABA(B) receptors leads to longer inhibitory postsynaptic potentials than activation of GABA(A) receptors. Therefore GABA(B) receptors may be a target for anticonvulsant therapy. The present study examined possible effects of GABA(B) receptor agonist SKF97541 on cortical and hippocampal epileptic afterdischarges (ADs). Epileptic ADs elicited by electrical stimulation of sensorimotor cortex or dorsal hippocampus were studied in adult male Wistar rats. Stimulation series were applied 6 times with 10- or 20-min interval. Either interval was efficient for reliable elicitation of cortical ADs but stimulation at 10-min intervals did not reliably elicit hippocampal ADs, many stimulations were without effect. SKF97541 in dose 1 mg/kg significantly prolonged cortical ADs. Duration of hippocampal ADs was not significantly changed by either dose of SKF97541 in spite of a marked myorelaxant effect of the higher dose. Our present data demonstrated that neither cortical nor hippocampal ADs in adult rats were suppressed by GABA(B) receptor agonist SKF97541. Proconvulsant effect on cortical ADs indicates a different role in these two brain structures. In addition, duration of refractory period for electrically-induced ADs in these two structures in adult rats is different.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effects of a GABA-B receptor agonist baclofen on cortical epileptic afterdischarges in rats.

Inhibition mediated by GABA-B receptors can play a role in epilepsy. We therefore studied its involvement in cortical epileptic afterdischarges in adult rats by means of a GABA-B receptor agonist baclofen. Three different experiments were performed with cortical epileptic afterdischarges and an additional experiment studied possible effect of baclofen on cortical interhemispheric (transcallosal...

متن کامل

Epileptology in Czech Republic Effects of a GABA-B receptor agonist baclofen on cortical epileptic afterdischarges in rats

Inhibition mediated by GABA-B receptors can play a role in epilepsy. We therefore studied its involvement in cortical epileptic afterdischarges in adult rats by means of a GABA-B receptor agonist baclofen. Three different experiments were performed with cortical epileptic afterdischarges and an additional experiment studied possible effect of baclofen on cortical interhemispheric (transcallosal...

متن کامل

Anticonvulsant action of GABA-B receptor agonist SKF97541 differs from that of baclofen.

GABA-B receptor agonist SKF97541 exhibits age-dependent anticonvulsant and proconvulsant actions in developing rats. It suppressed tonic phase of generalized seizures induced by pentetrazol in 7-, 12- and 18-day-old rats and increased their latency in 7- and 12-day-old animals. Other results in 18-day-old animals are not so clear. SKF97541 blocked the appearance of minimal clonic seizures, but ...

متن کامل

Action of GABA-B antagonist on cortical epileptic afterdischarges in rats is similar to that of GABA-A antagonist.

Threshold intensities for epileptic phenomena induced by cortical stimulation were used for comparison of the action of GABA-B and GABA-A antagonists in rats with implanted electrodes. Both CGP 35348 (200 mg/kg i.p.) and bicuculline (4 mg/kg i.p.) significantly decreased thresholds for spike-and-wave afterdischarges and their motor counterpart (clonic seizures) whilst transition into the second...

متن کامل

The Effect of 5HT3 Agonist Receptor of the Lateral Hippocampal on Amnesia Induce by Morphine in Mice

Background and Objective: It has been shown that the opioidergic system exerts widespread effects on cognitive functions. Interactions between opioid and serotonin receptors have been reported in some brain structures such as the dorsal hippocampus, thus a functional interaction between opioids and serotonin seems possible concerning memory control. The purpose of this study was to assess the e...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Physiological research

دوره 63 4  شماره 

صفحات  -

تاریخ انتشار 2014