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Transient potassium current in native Xenopus oocytes.

I Parker¹, R Miledi

¹Department of Psychobiology, University of California, Irvine 92715.

Proceedings of the Royal Society of London. Series B, Biological Sciences

|June 22, 1988

Summary

Xenopus laevis oocytes exhibit a fast outward potassium current upon depolarization. This ion flux is slow to recover from inactivation and is modulated by specific ions, offering insights into oocyte membrane excitability.

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Area of Science:

Cellular Electrophysiology
Oocyte Biology
Ion Channel Function

Background:

Follicle-enclosed Xenopus laevis oocytes display complex electrical responses to depolarization.
A specific fast transient outward current has been observed in some oocyte donors.

Purpose of the Study:

To characterize the biophysical properties of the fast transient outward current in Xenopus laevis oocytes.
To elucidate the ionic basis and regulatory mechanisms of this oocyte current.

Main Methods:

Electrophysiological recordings (voltage clamp) of Xenopus laevis oocytes.
Pharmacological manipulation using ion channel blockers (Ba2+, Zn2+, TEA+) and inhibitors (TTX).
Assessment of current sensitivity to extracellular ion concentrations and membrane potential changes.

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Main Results:

The outward current activates at depolarizing potentials around -30 mV and increases with further depolarization.
A slow recovery from inactivation (several seconds) was observed after depolarizing pulses.
The current is largely mediated by potassium ions, insensitive to TTX and extracellular chloride removal, and abolished by collagenase treatment.
Barium and zinc ions blocked the current, while tetraethylammonium was ineffective; manganese did not affect the current.

Conclusions:

The fast transient outward current in Xenopus oocytes is primarily a potassium current with unique inactivation properties.
Specific ion sensitivities suggest a distinct potassium channel subtype involved in oocyte excitability.
The findings contribute to understanding ion transport mechanisms in amphibian oocytes.