 |
 |
Article dans une revue
Mitotic lamin disassembly is triggered by lipid-mediated signaling.
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.
https://hal-mines-paristech.archives-ouvertes.fr/hal-01428007
Contributeur : Thomas Walter <>
Soumis le : vendredi 6 janvier 2017 - 11:35:12
Dernière modification le : mercredi 14 octobre 2020 - 04:01:52
Contributeur : Thomas Walter <>
Soumis le : vendredi 6 janvier 2017 - 11:35:12
Dernière modification le : mercredi 14 octobre 2020 - 04:01:52