Abstract
We have developed a method of rapidly changing the solutions on one side of a planar phospholipid bilayer. Bilayers can be painted on glass pipettes of tip diameter ⩾ 50 μm. By modifying an established method for rapid exchange of solutions bathing excised membrane patches, solution changes can be made at the bilayer within 10 ms. After incorporation of channels into the bilayer, the bilayer is moved into one of two parallel streams of solution flowing from a length of double-barrelled glass theta tubing. Activation of a solenoid system rapidly moves the theta tubing so that the bilayer is in the flow of the adjacent solution. For various reasons, the single-channel gating mechanisms of many channels are studied in planar bilayer systems. The conventional bilayer technique only allows for steady-state single-channel gating to be monitored. This novel method now allows the effects of rapid changes in modulators of channels incorporated into planar phospholipid bilayers to be measured.
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Brett RS, Dilger JP, Adams PR, Lancaster B (1986) A method for the rapid exchange of solutions bathing excised membrane patches. Biophys J 50:987–992
Cheng H, Cannell MB, Lederer WJ (1994) Propagation of excitation-contraction coupling into ventricular myocytes. Pflügers Arch 428:415–417
Colquhoun D, Jonas P, Sakmann B (1992) Action of brief pulses of glutamate on AMP/kainate receptors in patches from different neurones of rat hippocampal slices. J Physiol (Lond) 458:261–287
Dudel J, Franke C, Hatt H, Ramsey RL, Usherwood PNR (1988) Rapid activation and desensitization by glutamate of excitatory, cation-selective channels in locust muscle. Neurosci Lett 88:33–38
Dudel J, Franke C, Hatt H (1990) Rapid activation, desensitization, and resensitization of synaptic channels of crayfish muscle after glutamate pulses. Biophys J 57:533–545
Györke S, Fill M (1993) Ryanodine receptor adaptation: control mechanism of Ca2+-induced Ca2+ release in heart. Science 260:807–809
Hanke W, Methfessel C, Wilmsen U, Boheim G (1984) Ion channel reconstitution into lipid bilayer membranes on glass patch pipettes. Bioelectrochem Bioenerg 12:329–339
Kakei M, Ashcroft FM (1987) A microflow superfusion system for use with excised patches. Pflügers Arch 409:337–341
Lamb GD, Stephenson DG (1995) Activation of ryanodine receptors by flash photolysis of caged Ca2+. Biophys J 68:946–948
Lamb GD, Fryer MW, Stephenson DG (1994) Ca2+-induced Ca2+ release in response to flash photolysis. Science 263:986–987
Latorre R (1986) The large calcium-activated potassium channel. In: Miller C (ed) Ion channel reconstitution. Plenum, New York, pp 431–467
Lester RAJ, Clements JD, Westbrook GL, Jahr CE (1990) Channel kinetics determine the time course of NMDA receptor-mediated synaptic currents. Nature 346:565–567
Maconochie DJ, Knight DE (1989) A method for making solution changes in the sub-millisecond range at the tip of a patch pipette. Pflügers Arch 141:589–596
Moczydlowski E, Latorre R (1983) Gating kinetics of Ca-activated K-channels from rat muscle incorporated into planar lipid bilayers. Evidence for 2 voltage-dependent Ca2+ binding reactions. J Gen Physiol 82:511–542
Sitsapesan R, Williams AJ (1994) Gating of the native and purified cardiac SR Ca2+-release channel with monovalent cations as permeant species. Biophys J 67:1484–1494
Sitsapesan R, Montgomery RAP, MacLeod KT, Williams AJ (1991) Sheep cardiac sarcoplasmic reticulum calcium release channels: modification of conductance and gating by temperature. J Physiol (Lond) 434:469–488
Williams AJ (1994) An introduction to the methods available for ion channel reconstitution. In: Ogden D (ed) Microelectrode techniques: the plymouth workshop handbook 2nd edn. The Company of Biologists, Cambridge pp 79–99
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Sitsapesan, R., Montgomery, R.A.P. & Williams, A.J. A novel method for incorporation of ion channels into a planar phospholipid bilayer which allows solution changes on a millisecond timescale. Pflugers Arch. 430, 584–589 (1995). https://doi.org/10.1007/BF00373896
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DOI: https://doi.org/10.1007/BF00373896