Increased hypocretin-1 (orexin-a) levels in cerebrospinal fluid of rats after short-term forced activity

Increased hypocretin-1 (orexin-a) levels in cerebrospinal fluid of rats after short-term forced activity

Autor Martins, PJF Google Scholar
D'Almeida, V Google Scholar
Pedrazzoli, M. Google Scholar
Lin, L. Google Scholar
Mignot, E. Google Scholar
Tufik, S. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Stanford Univ
Resumo The hypocretins (orexins) are recently discovered neuropeptides initially associated with feeding behavior and sleep regulation. However, the normal function of these peptides is unclear and a number of studies have reported a role in energy homeostasis and locomotor activity. Exercise (or physical activity) is the most powerful way of challenging the internal homeostatic process. This study examines the circadian differences in response to forced activity and homeostatic challenges on hypocretin-1 (Hcrt-1) levels in the cerebrospinal fluid (CSF) of rats. Hcrt-1 levels were decreased after long-term immobilization at the end of active phase (zeigeber time-0, ZT-0) and increased after short-term forced swimming in the rest phase (ZT-8). Nevertheless, no effects were observed after short-term immobilization, total sleep deprivation or cold exposure. We concluded that despite the relation between hypocretins, stress and sleep regulation reported in the literature, short-term total sleep deprivation, immobilization and cold exposure did not induce increases in CSF Hcrt-1 levels at ZT-0 and ZT-8. On the other hand, the relationship between hypocretinergic system activation and motor activation is reinforced by decrease in Hcr-1 levels after long-term immobilization at ZT-0 and its increased levels after short-term forced swimming at ZT-8 in CSF of rats. (C) 2003 Elsevier B.V. All rights reserved.
Assunto sleep deprivation
Idioma Inglês
Data 2004-03-15
Publicado em Regulatory Peptides. Amsterdam: Elsevier B.V., v. 117, n. 3, p. 155-158, 2004.
ISSN 0167-0115 (Sherpa/Romeo, fator de impacto)
Editor Elsevier B.V.
Extensão 155-158
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000188956500001

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