title: Tumor suppressor VHL functions in the control of mitotic fidelity.
abstract: The von Hippel-Lindau (VHL) tumor suppressor protein pVHL is commonly mutated in clear cell renal cell carcinoma (ccRCC) and has been implicated in the control of multiple cellular processes that might be linked to tumor suppression, including promoting proper spindle orientation and chromosomal stability. However, it is unclear whether pVHL exerts these mitotic regulatory functions in vivo as well. Here, we applied ischemic kidney injury to stimulate cell division in otherwise quiescent mouse adult kidneys. We show that in the short term (5.5 days after surgery), Vhl-deficient kidney cells demonstrate both spindle misorientation and aneuploidy. The spindle misorientation phenotype encompassed changes in directed cell division, which may manifest in the development of cystic lesions, whereas the aneuploidy phenotype involved the occurrence of lagging chromosomes but not chromosome bridges, indicative of mitotic checkpoint impairment. Intriguingly, in the long term (4 months after the ischemic insult), Vhl-deficient kidneys displayed a heterogeneous pattern of ccRCC precursor lesions, including cysts, clear cell-type cells, and dysplasia. Together, these data provide direct evidence for a key role of pVHL in mediating oriented cell division and faithful mitotic checkpoint function in the renal epithelium, emphasizing the importance of pVHL as a controller of mitotic fidelity in vivo.
authors.affiliation: Authors' Affiliations: Institute of Molecular Health Sciences; Rodent Center HCI, Eidgenössische Technische Hochschule (ETH); and Institute of Surgical Pathology, University Hospital Zurich, Zurich, Switzerland.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Hell
authors.forename: Maria
authors.initials: M
authors.lastname: Duda
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Weber
authors.forename: Holger
authors.initials: H
authors.lastname: Moch
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Krek
mesh_terms: D000782:Aneuploidy; D000818:Animals; D017209:Apoptosis; D063646:Carcinogenesis / Q000378:metabolism*; D002292:Carcinoma, Renal Cell / Q000378:metabolism / Q000473:pathology; D049109:Cell Proliferation; D002478:Cells, Cultured; D043171:Chromosomal Instability; D020090:Chromosome Segregation; D004847:Epithelial Cells / Q000502:physiology; D007680:Kidney Neoplasms / Q000378:metabolism / Q000473:pathology; D007684:Kidney Tubules / Q000378:metabolism / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D008938:Mitosis; D008941:Spindle Apparatus / Q000378:metabolism; D051794:Von Hippel-Lindau Tumor Suppressor Protein / Q000502:physiology*
chemical_list: D051794:Von Hippel-Lindau Tumor Suppressor Protein; C494469:VHL protein, mouse