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      Glutamate transporter type 3 knockout mice have a decreased isoflurane requirement to induce loss of righting reflex.

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      Neuroscience

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          Abstract

          Excitatory amino acid transporters (EAAT) uptake extracellular glutamate, the major excitatory neurotransmitter in the brain. EAAT type 3 (EAAT3), the main neuronal EAAT, is expressed widely in the CNS. We have shown that the volatile anesthetic isoflurane increases EAAT3 activity and trafficking to the plasma membrane. Thus, we hypothesize that EAAT3 mediates isoflurane-induced anesthesia. To test this hypothesis, the potency of isoflurane to induce immobility and hypnosis, two major components of general anesthesia, was compared in the CD-1 wild-type mice and EAAT knockout mice that had a CD-1 strain gene background. Hypnosis was assessed by loss of righting reflex in this study. The expression of EAAT1 and EAAT2, two widely expressed EAATs in the CNS, in the cerebral cortex and spinal cord was not different between the EAAT3 knockout mice and wild-type mice. The concentration required for isoflurane to cause immobility to painful stimuli, a response involving primarily reflex loops in the spinal cord, was not changed by EAAT3 knockout. However, the EAAT3 knockout mice were more sensitive to isoflurane-induced hypnotic effects, which may be mediated by hypothalamic sleep neural circuits. Interestingly, the EAAT3 knockout mice did not have an altered sensitivity to the hypnotic effects caused by ketamine, an i.v. anesthetic that is a glutamate receptor antagonist and does not affect EAAT3 activity. These results suggest that EAAT3 modulates the sensitivity of neural circuits to isoflurane. These results, along with our previous findings which suggests that isoflurane increases EAAT3 activity, indicate that EAAT3 may regulate isoflurane-induced behavioral changes, including anesthesia.

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          Author and article information

          Journal
          Neuroscience
          Neuroscience
          1873-7544
          0306-4522
          Dec 15 2010
          : 171
          : 3
          Affiliations
          [1 ] Department of Anesthesiology, University of Virginia, 1 Hospital Drive, Charlottesville, VA 22908-0710, USA.
          Article
          S0306-4522(10)01292-3 NIHMS389580
          10.1016/j.neuroscience.2010.09.044
          3401886
          20875840
          e8888c6d-9ac4-4138-a89d-04844cfec403
          Copyright © 2010. Published by Elsevier Ltd.
          History

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