Effects of zimeldine, a selective 5-HT reuptake inhibitor, combined with ritanserin, a selective 5-HT2 antagonist, on waking and sleep stages in rats.
Sleep and waking in rats were studied 8 h following administration of a selective 5-hydroxytryptamine (5-HT) reuptake inhibitor (zimeldine), a selective 5-HT2 antagonist (ritanserin) and a combination of ritanserin and zimeldine. Consistent with earlier findings, zimeldine gave a biphasic effect on sleep and waking. Waking was increased the first 3 h, followed by an increase in deep slow wave sleep (SWS-2), maximal in hours 4 and 5. Ritanserin gave an increase in SWS-2 that was spread out over the recording period. Ritanserin + zimeldine also gave a biphasic effect as zimeldine did, and the initial increase in waking and the following increase in SWS-2 tended to be stronger. Thus, ritanserin did not block the initial waking effect seen after zimeldine administration, indicating that this waking effect was not due to 5-HT2 stimulation. The increase in SWS-2 seemed to reflect an addition of the increases following the zimeldine and ritanserin alone conditions. This suggests that the increase in SWS-2 seen after 5-HT reuptake inhibition and 5-HT2 blockade are independent phenomena. Zimeldine alone, ritanserin alone and the combination all gave a clear reduction of rapid eye movement sleep.
Bjorvatn
B
B
Department of Physiology, University of Bergen, Norway.
Ursin
R
R
D000818:Animals; D001143:Arousal / Q000187:drug effects*; D001921:Brain / Q000187:drug effects*; D004569:Electroencephalography / Q000187:drug effects; D008297:Male; D010880:Piperidines / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011930:Reaction Time / Q000187:drug effects; D011985:Receptors, Serotonin / Q000187:drug effects*; D016713:Ritanserin; D012701:Serotonin / Q000378:metabolism*; D012702:Serotonin Antagonists; D012894:Sleep Stages / Q000187:drug effects*; D012895:Sleep, REM / Q000187:drug effects; D014851:Wakefulness / Q000187:drug effects*; D015031:Zimeldine / Q000494:pharmacology*
D010880:Piperidines; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D016713:Ritanserin; D012701:Serotonin; D015031:Zimeldine