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 language | English |
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Pages (from-to) | 261-267 |
Number of pages | 7 |
Journal | Brain Research |
Volume | 740 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 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