Ionic coupling and mitotic synchrony of siblings in a Drosophila cell line

Experimental Cell Research
D C SprayG M Carrow

Abstract

Following mitosis in many cell lines, siblings remain adjoined in dyads until further cell division. We report here a series of experiments designed to ascertain the nature of this apposition in the embryonic Kc cell line of Drosophila melanogaster. We have found that (1) cell division in siblings is highly synchronized when compared to that in nonsiblings: (2) siblings in dyads are dye coupled with respect to Lucifer Yellow, but intercellular diffusion of larger molecules (FITC-dextran at 6 and 24 kDa) is retarded: (3) siblings are electrically coupled by an ungated low-resistance intercellular connection which is resistant to treatment with octanol and CO2, both known to close gap junction channels: and (4) members of a dyad are joined by a cytoplasmic bridge. Structures resembling septate junctions are also found between siblings and between cells in aggregates. The evidence accumulated here suggests that cytokinesis in Kc dyads is incomplete, resulting in an intercellular pathway that may provide for the passage of a molecular or electrical signal that regulates subsequent mitosis.

References

Apr 1, 1989·Proceedings of the National Academy of Sciences of the United States of America·J C SáezM V Bennett
Dec 1, 1974·Differentiation; Research in Biological Diversity·J M Arnold

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Citations

Nov 1, 1996·Visual Neuroscience·C Lu, D G McMahon
Aug 7, 2007·Tissue & Cell·J E Curran, R I Woodruff
Jul 1, 1994·Cell and Tissue Research·J L Juang, S D Carlson
Feb 1, 1990·The American Journal of Physiology·D C Spray, J M Burt

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