Cited by 341Sleep and Wakefulness ResearchAnesthesia and Sedative AgentsNeuroscience of respiration and sleep

An essential role for orexins in emergence from general anesthesia

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Kelz, Max B., Sun, Yi, Chen, Jingqiu, Cheng Meng, Qing, Moore, Jason T., Veasey, Sigrid C., Dixon, Shelley, Thornton, Marcus +2 more·2008·Proceedings of the National Academy of Sciences

Abstract

The neural mechanisms through which the state of anesthesia arises and dissipates remain unknown. One common belief is that emergence from anesthesia is the inverse process of induction, brought about by elimination of anesthetic drugs from their CNS site(s) of action. Anesthetic-induced unconsciousness may result from specific interactions of anesthetics with the neural circuits regulating sleep and wakefulness. Orexinergic agonists and antagonists have the potential to alter the stability of the anesthetized state. In this report, we refine the role of the endogenous orexin system in impacting emergence from, but not entry into the anesthetized state, and in doing so, we distinguish mechanisms of induction from those of emergence. We demonstrate that isoflurane and sevoflurane, two commonly used general anesthetics, inhibit c-Fos expression in orexinergic but not adjacent melanin-concentrating hormone (MCH) neurons; suggesting that wake-active orexinergic neurons are inhibited by these anesthetics. Genetic ablation of orexinergic neurons, which causes acquired murine narcolepsy, delays emergence from anesthesia, without changing anesthetic induction. Pharmacologic studies with a selective orexin-1 receptor antagonist confirm a specific orexin effect on anesthetic emergence without an associated change in induction. We conclude that there are important differences in the neural substrates mediating induction and emergence. These findings support the concept that emergence depends, in part, on recruitment and stabilization of wake-active regions of brain.

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  • Using c-Fos as a proxy, neurons in many wake-promoting nuclei are inhibited during general anesthesia.

    “using c-Fos as a proxy for antecedent activity, neurons within many of these nuclei have been identified to be inhibited during general anesthesia [98, 100, 101, 114].”

    From The Biology of General Anesthesia from Paramecium to Primate (2019) · cites this paper as [114]

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  1. [11]Sakurai T, et al. Cell. 1998;92:1. (page after 696) [Google Scholar]

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Authors
Kelz, M. B., Sun, Y., Chen, J., Cheng Meng, Q., Moore, J. T., Veasey, S. C., Dixon, S., Thornton, M., Funato, H., & Yanagisawa, M.
Affiliations
  • University of Pennsylvania (US)
  • *Department of Anesthesiology and Critical Care,
  • Howard Hughes Medical Institute (US)
Venue
Proceedings of the National Academy of Sciences
Published
2008-01-29
Volume
105
Issue
4
Pages
1309-1314
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2135826809
Cited by
341
References
36
Citations by year
2026: 12 · 2025: 15 · 2024: 21 · 2023: 17 · 2022: 14 · 2021: 30 · 2020: 25 · 2019: 18 · 2018: 19 · 2017: 12 · 2016: 13 · 2015: 14 · 2014: 22 · 2013: 11 · 2012: 19
FWCI
13.09
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Foundation for Anesthesia Education and Research
  • University of Pennsylvania
  • National Institutes of Health
  • National Institute of General Medical Sciences (K08GM077357)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Health Sciences › Medicine › Anesthesiology and Pain Medicine › Anesthesia and Sedative Agents
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
Keywords
orexin, emergence from anesthesia, general anesthesia, anesthesia induction, isoflurane, sevoflurane, Fos expression, orexinergic neurons, melanin-concentrating hormone neurons, orexin-1 receptor antagonist, sleep-wake regulation, loss of consciousness
MeSH terms
Orexins, Sevoflurane, Anesthesia, General, Animals, Female, Isoflurane, Male, Methyl Ethers, Mice, Inbred C57BL, Mice, Transgenic, Neurons, Neuropeptides, Signal Transduction, Proto-Oncogene Proteins c-fos, Anesthetics, Inhalation, Protein Transport, Intracellular Signaling Peptides and Proteins, Mice

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