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Spatial and temporal transcellular current patterns during oogenesis.

W Diehl-Jones¹, E Huebner

¹Department of Zoology, University of Manitoba, Winnipeg, Canada.

Developmental Biology

|October 1, 1992

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Electrical currents in insect ovaries change during egg development. These transcellular currents, measured using a vibrating probe, show dynamic patterns linked to vitellogenesis and may play a role in regulating oogenesis.

Area of Science:

Developmental biology
Insect reproductive physiology
Electrophysiology

Background:

Telotrophic ovarioles in insects are crucial for egg development.
Understanding the role of electrical currents in oogenesis is essential for comprehending reproductive processes.
Previous research has not fully elucidated the spatial and temporal dynamics of transcellular currents during insect oogenesis.

Purpose of the Study:

To investigate the spatial and temporal patterns of transcellular current flow around telotrophic ovarioles in Rhodnius prolixus.
To correlate these current patterns with different stages of vitellogenesis.
To determine the involvement of germ and somatic cells in current generation.

Main Methods:

Utilized a two-dimensional vibrating probe to measure extracellular currents.

Related Experiment Videos

Examined current patterns around intact ovarioles at various developmental stages.

Correlated electrophysiological measurements with observable stages of vitellogenesis.

Main Results:

Demonstrated dynamic patterns of transcellular currents correlating with vitellogenesis stages.
Observed asymmetries in radial current patterns, particularly around the terminal follicle.
Found that extracellular currents are reflected by currents over germ cell membranes, indicating dual cell involvement.
Observed current entry into previtellogenic oocytes and exit from oocytes entering vitellogenesis.

Conclusions:

Transcellular currents exhibit dynamic spatial and temporal patterns during insect oogenesis.
Both germ and somatic cells contribute to the generation of electrical currents.
Current reversal and loss of trophic cord contact may be an electrophysiological feedback mechanism controlling oogenesis.