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Related Experiment Videos

A delayed rectifier potassium current in Xenopus oocytes.

L Lu1, C Montrose-Rafizadeh, T C Hwang

  • 1Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

Biophysical Journal
|June 1, 1990
PubMed
Summary
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Xenopus oocytes possess an endogenous, voltage-dependent potassium (K+) current. This current exhibits characteristics of the delayed rectifier, crucial for nerve and muscle cell function.

Area of Science:

  • Electrophysiology
  • Ion Channels
  • Xenopus Oocyte Physiology

Background:

  • Xenopus oocytes are a valuable model for studying ion channel function.
  • Understanding endogenous currents is essential for interpreting heterologous expression studies.

Purpose of the Study:

  • To characterize the biophysical properties of a delayed voltage-dependent potassium (K+) current in Xenopus oocytes.
  • To determine if this endogenous current resembles the delayed rectifier found in other cell types.

Main Methods:

  • Voltage-clamp technique was employed to record K+ currents.
  • Activation and inactivation kinetics were analyzed across various membrane potentials.
  • Effects of Ca2+ removal and K+ concentration changes on current properties were investigated.

Related Experiment Videos

  • Blockade by quinine was assessed to identify channel properties.

    • Main Results:

    • The K+ current activated upon depolarization from -90 to -50 mV, peaking at +30 mV.
    • Voltage-dependent inactivation was observed, with a slow time constant (16.5 s at -10 mV).
    • The current was insensitive to Ca2+ and showed K(+)-selective properties, blocked by quinine (Ki = 35 µM).

    Conclusions:

    • Xenopus oocytes possess an endogenous delayed rectifier-like K+ current.
    • This current's properties are consistent with those found in nerve and muscle cells.
    • Variability in current amplitude exists between oocytes from different animals.