Loss of MYO5B expression deregulates late endosome size which hinders mitotic spindle orientation
Leng, Changsen (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands)
Overeem, Arend W. (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands)
Cartón-Garcia, Fernando (Hospital Universitari Vall d'Hebron)
Li, Qinghong (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen)
Klappe, Karin (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen)
Kuipers, Jeroen (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen)
Cui, Yingying (Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen)
Zuhorn, Inge S. (Department of Biomedical Engineering, University of Groningen, University Medical Center Groningen)
Arango, Diego (Hospital Universitari Vall d'Hebron)
van IJzendoorn, Sven C. D. (Department of Biomedical Sciences of Cells and Systems, section Molecular Cell Biology, University of Groningen, University Medical Center Groningen)
Universitat Autònoma de Barcelona

Data:	2019
Resum:	Recycling endosomes regulate plasma membrane recycling. Recently, recycling endosome-associated proteins have been implicated in the positioning and orientation of the mitotic spindle and cytokinesis. Loss of MYO5B, encoding the recycling endosome-associated myosin Vb, is associated with tumor development and tissue architecture defects in the gastrointestinal tract. Whether loss of MYO5B expression affects mitosis is not known. Here, we demonstrate that loss of MYO5B expression delayed cytokinesis, perturbed mitotic spindle orientation, led to the misorientation of the plane of cell division during the course of mitosis, and resulted in the delamination of epithelial cells. Remarkably, the effects on spindle orientation, but not cytokinesis, were a direct consequence of physical hindrance by giant late endosomes, which were formed in a chloride channel-sensitive manner concomitant with a redistribution of chloride channels from the cell periphery to late endosomes upon loss of MYO5B. Rab7 availability was identified as a limiting factor for the development of giant late endosomes. In accordance, increasing rab7 availability corrected mitotic spindle misorientation and cell delamination in cells lacking MYO5B expression. In conclusion, we identified a novel role for MYO5B in the regulation of late endosome size control and identify the inability to control late endosome size as an unexpected novel mechanism underlying defects in cell division orientation and epithelial architecture. Loss of the recycling endosome-associated motor protein myosin Vb causes the formation of giant late endo-lysosomes; these in turn hinder the orientation of the mitotic spindle and chromosome segregation. Deregulated endosome size thus hampers faithful cell division.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	PLoS biology, Vol. 17 (november 2019) , ISSN 1545-7885

DOI: 10.1371/journal.pbio.3000531
PMID: 31682603

29 p, 6.1 MB

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