Abstract

Administration of peptides kyotorphin (KT), neokyotorphin (NKT), and d-ser-2-NKT into the lateral brain ventricle (10 nmol increased the latency and attenuated the severity of picrotoxin-induced convulsions in rats. Anticonvulsive effects of the peptides were also observed after their administration into the CA1 hippocampi (2.5, 5, 10 nmol, with the order of potency d-ser-2-NKT → NKT → KT. When injected into the substantia nigra reticulata, the 10 nmol dose of NKT and d-ser-2-NKT displayed equal seizure-protecting effect, which was higher than that for KT. It is concluded that kyotorphin and its analogs provide structure-dependent, dose-dependent, and target site-dependent antiepileptic effect.

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