期刊
NEUROSCIENCE
卷 113, 期 3, 页码 663-670出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0306-4522(02)00158-6
关键词
sleep deprivation; prolonged wakefulness; ventrolateral preoptic area; brain; REM sleep; hypothalamus
资金
- NIDA NIH HHS [DA 03816] Funding Source: Medline
- NIMH NIH HHS [NIMH 01798, NIMH 39683] Funding Source: Medline
- NATIONAL INSTITUTE OF MENTAL HEALTH [R01MH039683, R37MH039683, K01MH001798] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON DRUG ABUSE [R01DA003816] Funding Source: NIH RePORTER
In creased activity of the histaminergic neurons of the posterior hypothalamus has been implicated in the facilitation of behavioral wakefulness. Recent evidence of reciprocal projections between the sleep-active neurons of the preoptic/anterior hypothalamus and the histaminergic neurons of the tuberomammillary nucleus suggests that histaminergic innervation of the preoptic/anterior hypothalamic area may be of particular importance in the wakefulness-promoting properties of histamine. To test this possibility, we used microdialysis sample collection in the preoptic/ anterior hypothalamic area of cats during natural sleep-wakefulness cycles, 6 h of sleep deprivation induced by gentle handling/playing, and recovery sleep. Samples were analyzed by a sensitive radioenzymatic assay. Mean basal levels of histamine in microdialysate during periods of wakefulness (1.155 +/- 0.225 pg/mul) did not vary during the 6 It of sleep deprivation. However, during the different sleep states, dramatic changes were observed in the extracellular histamine levels of preoptic/anterior hypothalamic area: wakefulness > non-rapid eye movement sleep > rapid eye movement sleep. Levels of histamine during rapid eye movement sleep were lowest (0.245 +/- 0.032 pg/mul), being significantly lower than levels during non-rapid eye movement sleep (0.395 +/- 0.081 pg/mul) and being only 21% of wakefulness levels. This pattern of preoptic/anterior hypothalamic area extracellular histamine levels across the sleep-wakefulness cycle closely resembles the reported single unit activity of histaminergic neurons. However, the invariance of histamine levels during sleep deprivation suggests that changes in histamine level do not relay information about sleep drive to the sleep-promoting neurons of the preoptic/anterior hypothalamic area. (C) 2002 IBRO. Published by Elsevier Science Ltd. All rights reserved.
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