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Journal of Cell Science, Vol 81, Issue 1 207-221, Copyright © 1986 by Company of Biologists

JOURNAL ARTICLES

Intracellular electrical potential measurements in Drosophila follicles

J Bohrmann, E Huebner, K Sander and H Gutzeit

We measured the intracellular electrical potential in oocyte and nurse cells of Drosophila follicles at different developmental stages (6-14) and determined the intrafollicular potential difference. During stages 8-10B, when intrafollicular transport is known to occur, no significant potential difference was found. During late vitellogenic stages the nurse cells assume a more positive potential than the oocyte. This result contrasts with the published data on Hyalophora follicles, in which intercellular electrophoresis of negatively charged proteins occurs from nurse cells to oocyte as a result of an intrafollicular potential difference (nurse cells more negative than the oocyte). Such a potential difference was not observed in Drosophila follicles at any stage, not even after application of juvenile hormone. The extrafollicular electrical field is described with a dipole model. The hypothetical dipole is located in the long axis of the follicle and changes its calculated length stage-specifically.


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J Bohrmann and K Biber
Cytoskeleton-dependent transport of cytoplasmic particles in previtellogenic to mid-vitellogenic ovarian follicles of Drosophila: time-lapse analysis using video-enhanced contrast microscopy
J. Cell Sci., January 4, 1994; 107(4): 849 - 858.
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© The Company of Biologists Ltd 1986