Inhibitory effect of baclofen on lordosis in female and male rats with dorsal raphe nucleus lesion or septal cut

Masaki Kakeyama, Korehito Yamanouchi

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The inhibitory effect of baclofen, a GABAβ receptor agonist, on lordosis was examined in female and male rats with dorsal raphe nucleus lesions (DRL) or cut of the septal fibers (ARD). Both female and male DRL and ARD rats showed higher lordosis quotients (LQ) than corresponding controls without brain surgery. This indicates that the dorsal raphe nucleus and the septum exert lordosis-inhibiting influences in female and male rats. After treatment with 10 mg/kg baclofen, the mean LQs in female control and female ARD groups were significantly lower than those of vehicle-treated control and ARD females. In DRL females, however, LQs did not decrease, even after the injection of baclofen. In males, baclofen also diminished lordosis in ARD rats, but not in DRL rats. These results suggest that the GABAB receptor system plays an inhibitory role in regulating lordosis behavior not only in female but also in male rats. Furthermore, the function of the GABA neurons depends on the inhibitory mechanism of the dorsal raphe nucleus in the regulation of female sexual behavior.

Original languageEnglish
Pages (from-to)290-296
Number of pages7
JournalNeuroendocrinology
Volume63
Issue number3
DOIs
Publication statusPublished - 1996 Jan 1

Keywords

  • Aminobutyric acid
  • Baclofen
  • Raphe nucleus
  • Septum
  • Sex behavior

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Endocrine and Autonomic Systems
  • Cellular and Molecular Neuroscience

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