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Cited by 448

The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.

Fluctuation of extracellular hypocretin‐1 (orexin A) levels in the rat in relation to the light–dark cycle and sleep–wake activities

Yoshida, Y., Fujiki, N., Nakajima, T., Ripley, B., Matsumura, H., Yoneda, H., Mignot, E., Nishino, S.·2001·European Journal of Neuroscience

Abstract

Hypocretins/orexins are neuropeptides implicated in sleep regulation and the sleep disorder narcolepsy. In order to examine how hypocretin activity fluctuates across 24 h with respect to the sleep–wake cycle, we measured changes in extracellular hypocretin‐1 levels in the lateral hypothalamus and medial thalamus of freely moving rats with simultaneous sleep recordings. Hypocretin levels exhibited a robust diurnal fluctuation; levels slowly increased during the dark period (active phase), and decreased during the light period (rest phase). Levels were not correlated with the amount of wake or sleep in each period. Although an acute 4‐h light‐shift did not alter hypocretin levels, 6‐h sleep deprivation significantly increased hypocretin release during the forced‐wake period. Hypocretin activity is, thus, likely to build up during wakefulness and decline with the occurrence of sleep. These findings, together with the fact that a difficulty in maintaining wakefulness during the daytime is one of the primary symptoms of hypocretin‐deficient narcolepsy, suggest that hypocretin activity may be critical in opposing sleep propensity during periods of prolonged wakefulness.

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Crossref · 10.1046/j.0953-816x.2001.01725.x

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Metadata

Authors
Yoshida, Y., Fujiki, N., Nakajima, T., Ripley, B., Matsumura, H., Yoneda, H., Mignot, E., & Nishino, S.
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2001-10
Volume
14
Issue
7
Pages
1075-1081
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2049082572
Cited by
448
References
42
FWCI
9.19
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Fluctuation of extracellular hypocretin‐1 (orexin A) levels in the rat in relation to the light–dark cycle and sleep–wake activities. https://app.cochat.ai/papers/10.1046/j.0953-816x.2001.01725.x
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Yoshida, Y., Fujiki, N., Nakajima, T., Ripley, B., Matsumura, H., Yoneda, H., Mignot, E., & Nishino, S. (2001). Fluctuation of extracellular hypocretin‐1 (orexin A) levels in the rat in relation to the light–dark cycle and sleep–wake activities. European Journal of Neuroscience. https://doi.org/10.1046/j.0953-816x.2001.01725.x

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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