Cited by 76Neuroscience and Neuropharmacology ResearchAnesthesia and Neurotoxicity ResearchMitochondrial Function and Pathology

Isoflurane disrupts excitatory neurotransmitter dynamics via inhibition of mitochondrial complex I

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Zimin, P.I., Woods, C.B., Kayser, E.B., Ramirez, J.M., Morgan, P.G., Sedensky, M.M.·2018·British Journal of Anaesthesia

Abstract

Background The mechanisms of action of volatile anaesthetics are unclear. Volatile anaesthetics selectively inhibit complex I in the mitochondrial respiratory chain. Mice in which the mitochondrial complex I subunit NDUFS4 is knocked out [Ndufs4(KO)] either globally or in glutamatergic neurons are hypersensitive to volatile anaesthetics. The volatile anaesthetic isoflurane selectively decreases the frequency of spontaneous excitatory events in hippocampal slices from Ndufs4(KO) mice.Methods Complex I inhibition by isoflurane was assessed with a Clark electrode. Synaptic function was measured by stimulating Schaffer collateral fibres and recording field potentials in the hippocampus CA1 region.Results Isoflurane specifically inhibits complex I dependent respiration at lower concentrations in mitochondria from Ndufs4(KO) than from wild-type mice. In hippocampal slices, after high frequency stimulation to increase energetic demand, short-term synaptic potentiation is less in KO compared with wild-type mice. After high frequency stimulation, both Ndufs4(KO) and wild-type hippocampal slices exhibit striking synaptic depression in isoflurane at twice the 50% effective concentrations (EC 50). The pattern of synaptic depression by isoflurane indicates a failure in synaptic vesicle recycling. Application of a selective A 1 adenosine receptor antagonist partially eliminates isoflurane-induced short-term depression in both wild-type and Ndufs4(KO) slices, implicating an additional mitochondria-dependent effect on exocytosis. When mitochondria are the sole energy source, isoflurane completely eliminates synaptic output in both mutant and wild-type mice at twice the (EC 50) for anaesthesia.Conclusions Volatile anaesthetics directly inhibit mitochondrial complex I as a primary target, limiting synaptic ATP production, and excitatory vesicle endocytosis and exocytosis.

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Crossref · 10.1016/j.bja.2018.01.036

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Authors
Zimin, P. I., Woods, C. B., Kayser, E. B., Ramirez, J. M., Morgan, P. G., & Sedensky, M. M.
Affiliations
  • University of Washington (US)
  • Seattle Children's Research Institute (US)
Corresponding author
Zimin, P.I.
Venue
British Journal of Anaesthesia
Publisher
Elsevier BV
Published
2018-05
Volume
120
Issue
5
Pages
1019-1032
ISSN
0007-0912 (ISSN-L)
OpenAlex
W2789922860
Cited by
76
References
55
Citations by year
2026: 8 · 2025: 7 · 2024: 11 · 2023: 9 · 2022: 11 · 2021: 13 · 2020: 10 · 2019: 6 · 2018: 1
FWCI
3.42
Type
journal article
Language
en
Open access
Locations
  • British Journal of Anaesthesia (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (R01GM105696, T32GM086270)
  • NW Mitochondrial Research Guild
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Anesthesia and Neurotoxicity Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
isoflurane, volatile anesthetics, mitochondrial complex I, excitatory neurotransmission, synaptic depression, synaptic vesicle recycling, adenosine A1 receptor, hippocampal CA1, mitochondrial respiration, glutamatergic neurons
MeSH terms
Animals, Female, Isoflurane, Male, Mice, Knockout, Neurotransmitter Agents, Anesthetics, Inhalation, Models, Animal, Electron Transport Complex I, Mice

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