Effects of benzodiazepine and GABA antagonists on anticonflict effects of antianxiety drugs injected into the rat amygdala in a water-lick suppression test

Shigenobu Shibata, Kimihiro Yamashita, Etsuko Yamamoto, Tohru Ozaki, Showa Ueki

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

In order to elucidate the role of the amygdala in rat conflict behavior in a water lick suppression test, we examined the effect of lesions of various nuclei of the amygdaloid complex on this behavior. An anticonflict effect was produced by a lesion of the anterior part of central and basolateral amygdala, and lesion to the posterior part of the central amygdala, but not by posterior of the basolateral amygdala or medial amygdala lesions. These results suggest that the amygdala, especially the anterior part of the central and basolateral nuclei, plays an important role in conflict behavior of rats in the water lick test. In a second experiment, the effects of benzodiazepine- and GABA-antagonists on the anticonflict action of diazepam, zopiclone, and phenobarbital injected into the anterior part of central and basolateral amygdala were examined, also using a water lick suppression test. A dose-dependent anticonflict action was produced by systemic administration as well as by intra-amygdala injection of diazepam, zopiclone, lormetazepam, flurazepam and phenobarbital. The order of potency was lormetazepam>zopiclone≧diazepam>flurazepam ≧phenobarbital for both routes of injection. The antiamygdala effects of diazepam and zopiclone injected into the amygdala were completely reversed by Ro15-1788 and β-CCM but not by bicuculline, while the anticonflict effect of phenobarbital was reversed by β-CCM but not by Ro15-1788 or bicuculline. The present results strongly suggest that the anterior nuclei of central and basolateral amygdala are important sites of action of antianxiety drugs, and that an anticonflict action produced by intra-amygdala injection of benzodiazepines or barbiturate is mediated through the different receptor mechansims.

Original languageEnglish
Pages (from-to)38-44
Number of pages7
JournalPsychopharmacology
Volume98
Issue number1
DOIs
Publication statusPublished - 1989 May
Externally publishedYes

Fingerprint

GABA Antagonists
Amygdala
Benzodiazepines
zopiclone
Water
Phenobarbital
Pharmaceutical Preparations
Diazepam
Flurazepam
Bicuculline
Injections
Basolateral Nuclear Complex
Central Amygdaloid Nucleus

Keywords

  • Amygdala
  • Barbiturates
  • Benzodiazepine
  • Conflict
  • GABA
  • Rat

ASJC Scopus subject areas

  • Pharmacology

Cite this

Effects of benzodiazepine and GABA antagonists on anticonflict effects of antianxiety drugs injected into the rat amygdala in a water-lick suppression test. / Shibata, Shigenobu; Yamashita, Kimihiro; Yamamoto, Etsuko; Ozaki, Tohru; Ueki, Showa.

In: Psychopharmacology, Vol. 98, No. 1, 05.1989, p. 38-44.

Research output: Contribution to journalArticle

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