Quiet wakefulness: the influence of intraperitoneal and intranasal oxytocin on sleep-wake behavior and neurophysiology in rats

Study Objectives Exogenous administration of the neuropeptide oxytocin exerts diverse effects on various neurobehavioral processes, including sleep and wakefulness. Since oxytocin can enhance attention to social and fear-related environmental cues, it should promote arousal and wakefulness. However, as oxytocin can attenuate stress, reduce activity, and elicit anxiolysis, oxytocin might also prime the brain for rest, and promote sleep. At present, little research has comprehensively characterized the neuropsychopharmacology of oxytocin-induced effects on sleep-wake behavior and no reconciliation of these two competing hypotheses has been proposed. Methods This study explored the effects of oxytocin on sleep-wake outcomes using radiotelemetry-based polysomnography in adult male and female Wistar rats. Oxytocin was administered via intraperitoneal (i.p.; 0.1, 0.3 and 1 mg center dot kg(-1)) and intranasal (i.n.; 0.06, 1, 3 mg center dot kg(-1)) routes. Caffeine (i.p. and i.n.; 10 mg center dot kg(-1)) was administered as a wake-promoting positive control. To ascertain mechanism of action, pretreatment experiments with the oxytocin receptor (OXTR) antagonist L-368,899 (i.p.; 5 mg center dot kg(-1)) followed by oxytocin (i.p.; 1 mg center dot kg(-1)) were also conducted. Results In both male and female rats, i.p. oxytocin promoted quiet wakefulness at the cost of suppressing active wakefulness, non-rapid eye movement (NREM) and rapid eye movement (REM) sleep. Several i.p. oxytocin-induced sleep-wake effects were mediated by OXTR binding. In contrast, i.n. oxytocin did not alter most sleep-wake outcomes at any dose tested. Both i.p. and i.n. caffeine demonstrated wake-promoting effects. Conclusions These findings help reconcile competing hypotheses of oxytocin-induced effects on sleep-wake behavior: i.p. oxytocin promotes quiet wakefulness-a state of restful environmental awareness compatible with both oxytocin's anxiolytic effects and its enhancement of processing complex stimuli.

Automated summary

The study examined the effects of oxytocin on sleep-wake behavior and found that intraperitoneal administration of oxytocin promoted quiet wakefulness and suppressed active wakefulness, non-rapid eye movement (NREM) sleep, and rapid eye movement (REM) sleep. The sleep-wake effects of oxytocin were mediated by oxytocin receptor binding. In contrast, intranasal administration of oxytocin did not affect sleep-wake outcomes.