Mitotic Golgi disassembly is required for bipolar spindle formation and mitotic progression

Gianni Guizzunti, Joachim Seemann

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

During mitosis, the mammalian Golgi vesiculates and, upon partitioning, reassembles in each daughter cell; however, it is not clear whether the disassembly process per se is important for partitioning or is merely an outcome of mitotic entry. Here, we show that Golgi vesiculation is required for progression to metaphase. To prevent Golgi disassembly, we expressed HRP linked to a Golgi-resident protein and acutely triggered the polymerization of 3,3'-diaminobenzidine (DAB) in the Golgi lumen. The DAB polymer does not affect interphase cell viability, but inhibits Golgi fragmentation by nocodazole and brefeldin A and also halts cells in early mitosis. The arrest is Golgi specific and does not occur when DAB is polymerized in the endosomes. Cells with a DAB polymer in the Golgi enter mitosis normally but arrest with an intact Golgi clustered at a monopolar spindle and an active spindle assembly checkpoint (SAC). Mitotic progression is restored upon centrosome depletion by the Polo-like kinase 4 inhibitor, centrinone, indicating that the link between the Golgi and the centrosomes must be dissolved to reach metaphase. These results demonstrate that Golgi disassembly is required for mitotic progression because failure to vesiculate the Golgi activates the canonical SAC. This requirement suggests that cells actively monitor Golgi integrity in mitosis.

Original languageEnglish (US)
Pages (from-to)E6590-E6599
JournalProceedings of the National Academy of Sciences of the United States of America
Volume113
Issue number43
DOIs
StatePublished - Oct 25 2016

Keywords

  • Golgi disassembly
  • Mitosis
  • Spindle formation

ASJC Scopus subject areas

  • General

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