Mitotic lamin disassembly is triggered by lipid-mediated signaling |
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| Authors: | Moritz Mall Thomas Walter Mátyás Gorjánácz Iain F Davidson Thi Bach Nga Ly-Hartig Jan Ellenberg Iain W Mattaj |
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| Institution: | 1European Molecular Biology Laboratory, 69117 Heidelberg, Germany;2Computational Biology, Mines ParisTech, 75006 Paris, Cedex 5, France;3Research Center, Curie Institute, 75005 Paris, Cedex 5, France;4Unit 900, Institut National de la Santé et de la Recherche Médicale, 75005 Paris, Cedex 5, France |
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| Abstract: | Disassembly of the nuclear lamina is a key step during open mitosis in higher eukaryotes. The activity of several kinases, including CDK1 (cyclin-dependent kinase 1) and protein kinase C (PKC), has been shown to trigger mitotic lamin disassembly, yet their precise contributions are unclear. In this study, we develop a quantitative imaging assay to study mitotic lamin B1 disassembly in living cells. We find that CDK1 and PKC act in concert to mediate phosphorylation-dependent lamin B1 disassembly during mitosis. Using ribonucleic acid interference (RNAi), we showed that diacylglycerol (DAG)-dependent PKCs triggered rate-limiting steps of lamin disassembly. RNAi-mediated depletion or chemical inhibition of lipins, enzymes that produce DAG, delayed lamin disassembly to a similar extent as does PKC inhibition/depletion. Furthermore, the delay of lamin B1 disassembly after lipin depletion could be rescued by the addition of DAG. These findings suggest that lipins activate a PKC-dependent pathway during mitotic lamin disassembly and provide evidence for a lipid-mediated mitotic signaling event. |
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