Involvement of 5-HT(1A) receptor mechanisms in the inhibitory effects of methamphetamine on photic responses in the rodent suprachiasmatic nucleus

Takahiro Moriya, Shiro Yamanouchi, Tatsuto Fukushima, Takao Shimazoe, Shigenobu Shibata, Shigenori Watanabe

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We examined the role of serotonin 1A (5-HT(1A)) receptors in the inhibitory effects of methamphetamine (MA) on photic entrainment to the circadian pacemaker in the suprachiasmatic nucleus (SCN) of rodents. MA inhibited optic nerve stimulation-evoked field potential in the SCN, light-induced Fos expression in the SCN and light-induced phase shift of hamster wheel-running rhythm. NAN-190, a 5-HT(1A) receptor antagonist, eliminated the inhibitory effects of MA. NAN-190 has also been reported to antagonize α1 adrenergic receptors. However, prazosin, which selectively antagonizes α1 adrenergic receptors, did not affect the inhibitory action of MA on light-induced Fos expression. In addition, parachloroamphetamine, which is known to be a 5-HT releaser, dose-dependently inhibited light-induced phase shift of wheel-running rhythm. These findings suggest that elevation of endogenous 5-HT levels by MA inhibits the photic entraining responses of the circadian pacemaker in the SCN via 5-HT(1A) receptor stimulation of the 5-HT released by MA.

Original languageEnglish
Pages (from-to)261-267
Number of pages7
JournalBrain Research
Volume740
Issue number1-2
DOIs
Publication statusPublished - 1996 Nov 18

Keywords

  • 5-HT(1A) receptor
  • NAN-190
  • circadian rhythm
  • methamphetamine
  • serotonin
  • suprachiasmatic nucleus

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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