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Inhalational anesthetics activate two-pore-domain background K+ channels.

Volatile anesthetics produce safe, reversible unconsciousness, amnesia and analgesia via hyperpolarization of mammalian neurons. In molluscan pacemaker neurons, they activate an inhibitory synaptic K+ current (IKAn), proposed to be important in general anesthesia. Here we show that TASK and TREK-1, two recently cloned mammalian two-P-domain K+ channels similar to IKAn in biophysical properties, are activated by volatile general anesthetics. Chloroform, diethyl ether, halothane and isoflurane activated TREK-1, whereas only halothane and isoflurane activated TASK. Carboxy (C)-terminal regions were critical for anesthetic activation in both channels. Thus both TREK-1 and TASK are possibly important target sites for these agents.[1]

References

  1. Inhalational anesthetics activate two-pore-domain background K+ channels. Patel, A.J., Honoré, E., Lesage, F., Fink, M., Romey, G., Lazdunski, M. Nat. Neurosci. (1999) [Pubmed]
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