Hypoprolactinemic rats under conditions of constant darkness or constant light. Effects on the sleep-wake cycle, cerebral temperature and sulfatoxymelatonin levels

Hypoprolactinemic rats under conditions of constant darkness or constant light. Effects on the sleep-wake cycle, cerebral temperature and sulfatoxymelatonin levels

Autor Lobo, L. L. Google Scholar
Claustrat, B. Google Scholar
Debilly, G. Google Scholar
Paut-Pagano, L. Google Scholar
Jouvet, M. Google Scholar
Valatx, J. L. Google Scholar
Instituição Univ Lyon 1
Ctr Med Nucl
Universidade Federal de São Paulo (UNIFESP)
Resumo In genetic hypoprolactinemic rats under light-dark (LD) conditions, the circadian rhythms of slow-wave (SWS) and paradoxical (PS) sleep display an alteration of their phase relationship. the aim of our study was to investigate the effects of constant darkness (DD) or constant light (LL) on the daily distribution and amounts of sleep-wake stages, cerebral temperature and concentrations of the urinary melatonin metabolite, 6-sulfatoxymelatonin, in prolactin-deficient rats. After 3 weeks of DD, the SWS period was 24 h 8 +/- 6 min and the acrophase occurred at 15:44 +/- 1.35, while for PS, the period was more stable than during LD (24 h 10 +/- 8 min vs. 24 h 55 +/- 43 min) and the acrophase occurred at 16:44 +/- 1:54. Under LL conditions, circadian sleep rhythms persisted during the first 3 days, then completely disappeared during the third week, to be replaced by ultradian rhythms (period of 4-6 h). Time-series analysis showed that the two sleep states became synchronous as early as the second day under constant conditions; the total amount of PS was increased under both conditions (LL and DD) at the expense of duration of waking. Under LD and constant conditions, the pattern of changes in cerebral temperature was similar to that for wakefulness (W). Sulfatoxymelatonin was rhythmically secreted under both LD and DD conditions, whereas, under LL conditions, its rhythm was abolished. the results show that, in IPL rats in the absence of a zeitgeber, the PS and SWS rhythms recover a synchronous phase relationship and PS amounts are increased. (C) 1999 Elsevier Science B.V. All rights reserved.
Palavra-chave paradoxical sleep
slow-wave sleep
cerebral temperature
constant darkness
constant light
prolactin
melatonin
Idioma Inglês
Data de publicação 1999-07-24
Publicado em Brain Research. Amsterdam: Elsevier B.V., v. 835, n. 2, p. 282-289, 1999.
ISSN 0006-8993 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 282-289
Fonte http://dx.doi.org/10.1016/S0006-8993(99)01608-X
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000081730400021
Endereço permanente http://repositorio.unifesp.br/handle/11600/26115

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