Anticonvulsant effects of focal and intracerebroventricular adenosine on penicillin-induced epileptiform activity in rats.
Adenosine has potent anticonvulsant effects on various models of experimental epilepsy. In the present study, we examined the effects of focal and intracerebroventricular (i.c.v.) adenosine on penicillin-induced epileptiform activity in Wistar rats. The effects of theophylline, a non-selective adenosine receptor antagonist, were also researched. The recordings of electrocorticogram (ECoG) were carried out by using a data acquisition system, under urethane anesthesia. Adenosine was given in doses of 1, 10 and 100 microg/rat via focal and i.c.v. 30 min after penicillin administration. Theophylline was injected in doses of 1, 10 and 100 microg/rat by i.c.v. too. Adenosine administration significantly decreased the spike frequency while theophylline increased. Focal adenosine is more effective than i.c.v. adenosine. 100 microg adenosine is an effective dose that causes a decrease in epileptiform activity during experiments. We also demonstrated that 100 microg theophylline significantly increased epileptiform activity. Our findings suggest that focal adenosine is more effective than i.c.v. adenosine on epileptiform activity.
Yildirim
Mehmet
M
Department of Physiology, Faculty of Medicine, University of Ondokuz Mayis, 55139 Samsun, Turkey. mehmetyd@omu.edu.tr
Marangoz
Cafer
C
D000200:Action Potentials / Q000187:drug effects / Q000502:physiology; D000241:Adenosine / Q000378:metabolism / Q000494:pharmacology*; D000818:Animals; D000927:Anticonvulsants / Q000378:metabolism / Q000494:pharmacology*; D001921:Brain / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D003292:Convulsants / Q000009:adverse effects; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004333:Drug Administration Routes; D004569:Electroencephalography / Q000187:drug effects; D004827:Epilepsy / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism; D005260:Female; D007276:Injections, Intraventricular; D010406:Penicillins / Q000009:adverse effects; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D058915:Purinergic P1 Receptor Antagonists; D051381:Rats; D017208:Rats, Wistar; D018047:Receptors, Purinergic P1 / Q000378:metabolism; D013806:Theophylline / Q000494:pharmacology
D000927:Anticonvulsants; D003292:Convulsants; D010406:Penicillins; D010726:Phosphodiesterase Inhibitors; D058915:Purinergic P1 Receptor Antagonists; D018047:Receptors, Purinergic P1; D013806:Theophylline; D000241:Adenosine