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Related Experiment Videos

Electrical currents through full-grown and maturing Xenopus oocytes.

K R Robinson

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1979
    PubMed
    Summary

    Current flows into Xenopus laevis oocytes and out, primarily via chloride ions. Progesterone and other agents block this electrical current, indicating a role in oocyte maturation.

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    Area of Science:

    • Developmental Biology
    • Cellular Electrophysiology
    • Oocyte Maturation

    Background:

    • Xenopus laevis oocytes exhibit intrinsic electrical currents crucial for development.
    • Understanding ion transport mechanisms is key to deciphering oocyte maturation processes.

    Purpose of the Study:

    • To map the extracellular current pattern around Xenopus laevis oocytes.
    • To investigate the ionic basis of the current and its modulation by maturation-inducing agents.

    Main Methods:

    • Extracellular vibrating electrode technique to measure current density.
    • Ionic manipulation (ion removal/addition) and drug treatments.
    • Analysis of current changes in response to progesterone and other agents.

    Main Results:

    • Current enters the animal hemisphere and exits the vegetal hemisphere of oocytes.
    • Maximal current density was approximately 1 µA/cm² in mature oocytes.
    • Progesterone and maturation agents significantly reduced current, with a half-time of ~20 min for progesterone.

    Conclusions:

    • Chloride ions are the primary charge carriers responsible for the measured extracellular current.
    • Calcium-dependent regulation of chloride permeability controls the oocyte's electrical current.
    • Modulation of this current is an early event during progesterone-induced oocyte maturation.

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