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Related Experiment Videos

Orexinergic neurons and barbiturate anesthesia.

T Kushikata1, K Hirota, H Yoshida

  • 1Department of Anesthesiology, University of Hirosaki School of Medicine, Zaifu-cho 5, Hirosaki, Japan 036-8562. masuika@cc.hirosaki-u.ac.jp

Neuroscience
|October 29, 2003
PubMed
Summary

Orexins (OXs) shorten barbiturate anesthesia duration by affecting norepinephrine release. This suggests orexinergic neurons are a key target for barbiturates, independent of GABAA, OX1, and OX2 receptors.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Orexins (OXs) regulate sleep and interact with noradrenergic neurons.
  • Noradrenergic activity influences barbiturate anesthesia.
  • Previous research shows OXs evoke norepinephrine release.

Purpose of the Study:

  • To investigate the hypothesis that barbiturate anesthesia results from interaction with central orexinergic systems.
  • To determine the role of orexinergic systems in barbiturate-induced anesthesia.

Main Methods:

  • In vivo studies in rats assessed the effects of OX A, B, and SB-334867-A on barbiturate anesthesia duration.
  • In vitro studies examined barbiturate effects on OX-evoked norepinephrine release.
  • Calcium imaging in cells expressing OX1/OX2 receptors evaluated barbiturate interactions.

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Main Results:

  • Orexins (OX A and B) significantly decreased anesthesia times (15-40%).
  • SB-334867-A (OX1 antagonist) increased anesthesia time and reversed OX A effects.
  • Barbiturates inhibited OX-evoked norepinephrine release in vitro; GABAA receptor antagonists/agonists did not affect this interaction.

Conclusions:

  • Orexinergic neurons are likely an important target for barbiturates.
  • GABAA, OX1, and OX2 receptors do not appear to be involved in the interaction between barbiturates and orexins.