Involvement of GABAergic System in Increased Pentylenetetrazole-Induced Seizure Threshold in Cholestatic Mice

Authors

  • Mir Hadi Khayat Nouri Department of Pharmacology, School of Veterinary Medicine, Islamic Azad University, Tabriz, Iran
  • Morteza Samini Department of Pharmacology, Faculty of Medicine, Tehran University of Medical Sciences/ Tehran University, Tehran, Iran
  • Vahab Babapour Department of Physiology, Faculty of Veterinary Medicine, Tehran University
Abstract:

     Gamma-aminobutyric acid (GABA) is an important inhibitory transmitter in central nervous system and is involved in pathophysiology of epilepsy. Pentylenete-trazole (PTZ), a convulsant agent, partly acts via anion channel of GABAA receptor. Ivermectin, an antiparasitic agent and a GABAA agonist, has anticonvulsant effect in animal seizure models. Cholestasis increases the threshold of PTZ-induced clonic seizure in mice. The object of this study was to clarify the involvement of GABAergic pathways in increasing PTZ-induced seizure threshold (ST) in cholestatic mice. The result of this study showed that cholestasis increases clonic ST three days after surgery while sham-operated control (SOC) and unoperated control (UOC) groups did not show any alteration in clonic ST. Bicuculline, a GABAA antagonist, reversed but ivermectin increased the clonic ST in UOC, SOC and bile duct-ligated mice, respectively. In conclusion, our results showed that: (1) acute cholestasis is associated with an increase in PTZ-induced clonic ST in mice and this phenomenon may be the result of reinforcement of GABAergic system, and (2) GABA plays a physiological role in regulation of ST.  

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Journal title

volume 3  issue 1

pages  25- 30

publication date 2007-01-01

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