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ANTICONVULSANT EFFECT OF A NOVEL TRH ANALOG (DN-1417) ON AMYGDALOID KINDLED SEIZURE II:COMPARISON WITH TRH TYTRATE Kiyoshi Morimoto 1 , Takashi Moriwake 1 , Mitsumoto Sato 1 , Saburo Otsuki 1 1Department of Neuropsychiatry, Okayama University Medical School pp.501-504
Published Date 1983/5/1
DOI https://doi.org/10.11477/mf.1406205125

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  • Abstract
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We reported previously that a novel TRH analog, DN-1417 had anticonvulsant effects in kindling cat preparations which had been estab-lished as an experimental model of epilepsy. For the purpose of comparison with the anticonvulsant effect of DN-1417, the effect of TRH Tytrate (TRH?T) was examined in 6 amygdaloid kindled cats.

After intravenous administration of TRH?T, final electroconvulsive threshold (FET) stimulation was given to the amygdala. Dose of TRH?T (O. 5, 1, 2 or 4 mg/kg) and FET stimulation time (5, 10, 15, or 20 min. after the administration) were flexible in this study. Firstly, changes in autono-mic manifestations and in awake resting EEG induced by TRH?T administration were investiga-ted in kindled cats. Secondly, acute anticonvulsant effects of TRH?T on both behavioral seizure and afterdischarge induced by amygdaloid stimulation were examined. Furthermore, changes in FET were examined 24 hours after the drug administra-tion.

The following results were obtained:

1) Autonomic manifestations including hypersa-livation and hyperpnea were more prominent after TRH?T administration than those when the same dosage of DN-1417 was used. There was no change on awake resting EEG of kindled cats, in which the frequency of interictal discharge was unchanged following either TRH?T or DN-1417.

2) TRH?T suppressed the kindled generalized seizure in 4 out of 6 cats (cf. DN-1417 ; 10 out of 11). Such acute anticonvulsant effect of TRH?T lasted for several minutes without dose-dependent response. These characteristic anticonvulsant effects of TRH?T were identical to those of DN-1417 as reported previously. Since TRH?T and DN-1417 have common pharmacological action on brain noradrenergic system, it is suggested that central noradrenergic system may participate in the acute anticonvulsant effect of DN-1417.

3) FET was elavated after 24 hours of TRH?T administration in 3 out of 6 cats (cf. DN-1417 ; 4 out of 11) in which acute anticonvulsant effect was positive. This effect was duplicated and persisted for 4 to 60 days. Such long-lasting anticonvulsant effect of TRH?T has never been reported using kindling preparations.


Copyright © 1983, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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