The Ste20-like Kinase SLK Is Required for Cell Cycle Progression through G2
| Autor: | Douglas J. Franks, Katia Cailliau, Luc A. Sabourin, Simona Wagner, Colette Dissous, Edith Browaeys, Paul O'Reilly |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
G2 Phase
Cyclin-dependent kinase 1 Base Sequence biology Cell growth Xenopus Cyclin D Cyclin A Fluorescent Antibody Technique Spindle Apparatus Cell Biology Protein Serine-Threonine Kinases Cell cycle Flow Cytometry Biochemistry Cell biology Spindle apparatus Mice CDC2 Protein Kinase biology.protein Animals Molecular Biology Mitosis DNA Primers |
| Zdroj: | Journal of Biological Chemistry. 280:42383-42390 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m510763200 |
| Popis: | We have previously shown that the Ste20-like kinase SLK is a microtubule-associated protein that can regulate actin reorganization during cell adhesion and spreading (Wagner, S., Flood, T. A., O'Reilly, P., Hume, K., and Sabourin, L. A. (2002) J. Biol. Chem. 277, 37685-37692). Because of its association with the microtubule network, we investigated whether SLK plays a role in cell cycle progression, a process that requires microtubule dynamics during mitosis. Consistent with microtubule association in exponentially growing cells, our results showed that SLK co-localizes with the mitotic spindle in cells undergoing mitosis. Expression of a kinase-inactive mutant or SLK small interfering RNAs inhibited cell proliferation and resulted in an accumulation of quiescent cells stimulated to re-enter the cell cycle in the G2 phase. Cultures expressing the mutant SLK displayed a normal pattern of cyclin D, E, and B expression but failed to down-regulate cyclin A levels, suggesting that they cannot proceed through M phase. In addition, these cultures displayed low levels of both phospho-H3 and active p34/cdc2 kinase. Overexpression of active SLK resulted in ectopic spindle assembly and the induction of cell cycle re-entry of Xenopus oocytes, suggesting that SLK is required for progression through G2 upstream of H1 kinase activation. |
| Databáze: | OpenAIRE |
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