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Journal of Cell Science, Vol 110, Issue 16 1907-1917, Copyright © 1997 by Company of Biologists
JOURNAL ARTICLES |
JC Canman and WM Bement
Department of Zoology, University of Wisconsin, Madison 53706, USA.
Several cell motility processes including cytokinesis and cell locomotion are dependent on the interplay of the microtubule and actomyosin cytoskeletons. However, because such processes are essentially visual phenomena, interactions between the two cytoskeletal systems have been difficult to study quantitatively. To overcome this difficulty, we have developed the Xenopus oocyte as an inducible, quantitative model system for actomyosin-based cortical flow and then exploited the strengths of this system to assess the relationship between microtubules and cortical flow. As in other systems, oocyte cortical flow entails: (1) redistribution of cortical filamentous actin (f-actin); (2) a requirement for actomyosin; (3) redistribution of cell surface proteins; (4) a requirement for cell surface protein mobility; and (5) directed movement of cortical organelles. Cortical flow rate in the oocyte system is inversely proportional to the level of polymeric tubulin and microinjection of free tubulin has no effect on the rate of cortical flow. Enhancement of microtubule polymerization inhibits cortical f-actin cable formation during cortical flow. The effects of microtubule depolymerization on cortical flow are rapid, independent of transcription or translation, independent of effects on the oocyte intermediate filament system, and independent of the upstream stimulus for cortical flow. The results show that the microtubules themselves, or a factor associated with them, suppress cortical flow, either by mechanically resisting flow, or by modulating the actomyosin cytoskeleton.
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