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Electrical Polarity and Cellular Differentiation in Meroistic Ovaries |
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| Authors: | TELFER, WILLIAM H. WOODRUFF, RICHARD I. HUEBNER, ERWIN |
| Affiliation: | Department of Biology, University of Pennsylvania Philadelphia, Pennsylvania 19104 Department of Biology, West Chester State College West Chester, Pennsylvania 19380 Department of Zoology, University of Manitoba Winnepeg, Manitoba R3T 2NT, Canada |
| Abstract: | SYNOPSIS. In the oocyte-nurse cell syncytium of meroistic insectovaries a gradient in electrical potential is shown to drivea micro-injected basic protein (fluorescein-labeled lysozyme)and its methylcarboxylated, acidic derivative in opposite directions.In the polytrophic Cecropia ovary the electrophoretic effectis greatest in the intercellular bridges, while in the telotrophicRhodnius ovary it is greatest within the nurse chamber. We speculatethat in both systems the potential gradient prevents the freediffusion of cell cycle and differentiative control proteins,while at the same time reinforcing the transport of acidic precursorstoward the ooplasm. Because of its apparent ability to affectthe distribution of polyions that govern nuclear function, electricalpolarity can also be envisioned to have a more general rolein the control of differentiation. The possibility is consideredthat it serves as a relay mechanism for the non-diffusing determinantthat is already known to govern the differentiation of oocytesfrom nurse cells. |
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