Single- and multi-channel currents recorded with patch electrodes in mouse eggs.

A Peres; G Mostacciuolo

doi:10.1016/0309-1651(87)90082-8

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Single- and multi-channel currents recorded with patch electrodes in mouse eggs.

A Peres·G Mostacciuolo

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Abstract

Zona-free mouse eggs are amenable to patch recording as well as to whole-cell recording (Bland et al., 1984; Peres, 1986a). Although many patches are silent, others show spontaneous channel opening; the single channel current is 1.5 pA and inwardly directed at resting potential (RP). Current amplitudes distribute normally as a single population at RP, however at RP-50 mV the amplitude histogram indicates two channel populations. Open time distribution is exponential with a mean open time between 4 and 7 msec at RP. In three cases out of thirty-eight, in which depolarizations were given from a holding potential of RP-50 mV, microscopic currents very similar in kinetics and voltage-dependence to the whole-cell Ca2+ current were observed. No single-channel currents could be resolved in these traces. The results reported here indicate that the voltage-dependent Ca2+ current of the mouse egg goes through low-conductance channels located in high density spots on the egg surface.

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Animals Calcium Cell Membrane Electric Conductivity Female Ion Channels Kinetics Membrane Potentials Mice Ovum Journal Article

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A Peres, G Mostacciuolo. 1987. Single- and multi-channel currents recorded with patch electrodes in mouse eggs.. https://doi.org/10.1016/0309-1651(87)90082-8

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