T. Beeler et K. Gable, EFFECT OF THE GENERAL ANESTHETIC HALOTHANE ON THE ACTIVITY OF THE TRANSVERSE TUBULE CA2-ACTIVATED K+ CHANNEL(), FEBS letters, 331(3), 1993, pp. 207-210
The effect of the general anesthetic halothane on the activity of the
rat skeletal muscle Ca2+-activated K+ channel in planar lipid bilayers
was investigated. Halothane concentrations in the clinical range (1.0
-0.2 mM) alter the regulation of the channel by both Ca2+ and membrane
potential. At Ca2+ concentrations between 10 and 250 muM and membrane
potentials between 0 and -30 mV, halothane significantly decreases th
e open state probability without changing the channel conductance. The
results demonstrate that halothane can act directly on the Ca2+-activ
ated K+ channel or its lipid environment to alter the channel gating k
inetics.