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Large electrical currents traverse developing Ceropia follicles.

L F Jaffe1, R I Woodruff

  • 1Department of Biological Sciences, Purdue University, Lafayette, Indiana 47907.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 1979
PubMed
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Electrical currents play a vital role in Cecropia moth oocyte development. Ion pumps in the nurse cell membrane likely drive these currents, influencing follicle growth and oogenesis.

Area of Science:

  • Developmental biology
  • Cell biology
  • Electrophysiology

Background:

  • During oocyte development in Cecropia moths, electrical currents are known to flow through the follicle.
  • Previous studies using intracellular microelectrodes suggested large currents across the cytoplasmic bridge between oocytes and nurse cells.

Purpose of the Study:

  • To investigate the electrical current dynamics during Cecropia moth oocyte development.
  • To elucidate the role of ion pumps in generating these currents.

Main Methods:

  • Measurement of transfollicular electrical currents in Cecropia moth follicles.
  • Analysis of current distribution during different stages of oocyte growth.
  • Modeling of ion pump activity to explain observed currents.

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Main Results:

  • An intense electrical current enters the anterior nurse cell end of the growing follicle, with a total transfollicular current of approximately 100 nA in late stages.
  • A separate 1 nA current leaves the furrow between the oocyte and nurse cells.
  • Post-nurse cell collapse, current redistributes, with inward currents appearing at both follicle poles.

Conclusions:

  • The study presents a model attributing measured transfollicular and furrow currents, as well as apparent bridge currents, to an ion pump on the nurse cell face of the furrow membrane.
  • This ion pump activity is crucial for regulating electrical currents during oogenesis in Cecropia moths.