title: Intraperitoneal cholecystokinin-8 induces atypical somnolence and EEG changes.
abstract: EEG sleep recordings were performed in rats after administration of CCK-8. Mildly food-deprived rats were given IP CCK-8 (8 and 16 micrograms/kg body weight) and behavioural as well as EEG changes were examined. With 16 micrograms/kg of CCK-8, there was a significant increase of slow wave sleep in the 30 min of recording. Paradoxical sleep was unchanged or slightly decreased. The low dose of CCK-8 did not promote sleep. In addition both doses of CCK-8 induced EEG alterations including the presence of unusual acute spikes and slowing of EEG rhythm concomitant with awake immobility in rats. The computerized spectral analysis showed that CCK-8 slowed the EEG-wave frequency without modifying the total power energy in comparison with control wakefulness. In contrast, there was no effect in alcuronium-immobilized rats after 8 to 32 micrograms/kg IP of CCK-8. These observations do not support the idea that CCK-8, as a satiating factor like food, would promote sleep.
authors.affiliation: Synthelabo Recherche (L.E.R.S.), Bagneux, France.
authors.forename: H
authors.initials: H
authors.lastname: Depoortere
authors.forename: Z
authors.initials: Z
authors.lastname: De Saint-Hilaire
authors.forename: S
authors.initials: S
authors.lastname: Nicolaïdis
mesh_terms: D000818:Animals; D001143:Arousal / Q000187:drug effects*; D002540:Cerebral Cortex / Q000187:drug effects*; D002940:Circadian Rhythm / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects*; D004569:Electroencephalography / Q000187:drug effects*; D006815:Hunger / Q000187:drug effects*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012815:Signal Processing, Computer-Assisted; D012844:Sincalide / Q000494:pharmacology*; D012894:Sleep Stages / Q000187:drug effects*
chemical_list: D012844:Sincalide