Inhibition by γ-Aminobutyric Acid System Activation of Epileptic Seizures in Spontaneously Epileptic Rats

The Japanese Journal of Pharmacology

Masashi Sasa¹  Tadao Serikawa²  Yasuhiko Fujita²  Kenjiro Fukao⁴  Hisamitsu Ujihara⁵  Toshihiko Momiyama⁴  Kumatoshi Ishihara¹  Kohtaro Taniyama³ 

[1] Department of Pharmacology, Hiroshima University School of Medicine;Institute of Laboratory Animals, Faculty of Medicine, Kyoto University;Department of Pharmacology, Nagasaki University School of Medicine;Department of Pharmacology, Faculty of Medicine, Kyoto University;Department of Neuropsychiatry, Kochi Medical School

关键词: Spontaneously epileptic rat;    γ-Aminobutyric acid;    Muscimol;    Aminooxy-acetic acid;    Epileptic seizure;   

DOI  :  10.1254/jjp.76.387

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(32)Cited-By(4)The effects of muscimol, a γ-aminobutyric acid (GABA)A-receptor agonist, and aminooxy-acetic acid (AOAA), an inhibitor of GABA-converting enzyme, on tonic and absence-like seizures in spontaneously epileptic rats (SER: zi/zi, tm/tm) were investigated to elucidate whether GABAergic function operates normally in these animals. Muscimol at doses of 1 and 3 mg/kg (i.p.) induced high-voltage slow waves in the cortical and hippocampal EEG of SER, although the behavioral observation suggested inhibition of absence-like seizures. Similar high-voltage slow waves were also observed in the cortical and hippocampal EEG of normal rats with muscimol (1 and 3 mg/kg). Tonic convulsions in SER were dose-dependently inhibited by muscimol. AOAA (3 and 10 mg/kg, i.v.) inhibited both tonic and absence-like seizures in SER, although there were no obvious changes in EEG pattern. The inhibitory effects of AOAA on tonic convulsions appeared more slowly and lasted longer than those on absence-like seizures. Cerebral, hippocampal and cerebellar GABA levels were significantly higher in SER than the normal Kyo:Wistar and zitter rat (zi/zi), which were both the parent strains. These findings suggest that GABA receptors and GABAergic neurons are functional in SER and that the GABA system is involved in the inhibition of both seizures.

【 授权许可】

Unknown