title: Erythropoietic defect associated with reduced cell proliferation in mice lacking the 26S proteasome shuttling factor Rad23b.
abstract: Rad23a and Rad23b proteins are linked to nucleotide excision DNA repair (NER) via association with the DNA damage recognition protein xeroderma pigmentosum group C (XPC) are and known to be implicated in protein turnover by the 26S proteasome. Rad23b-null mice are NER proficient, likely due to the redundant function of the Rad23b paralogue, Rad23a. However, Rad23b-null midgestation embryos are anemic, and most embryos die before birth. Using an unbiased proteomics approach, we found that the majority of Rad23b-interacting partners are associated with the ubiquitin-proteasome system (UPS). We tested the requirement for Rad23b-dependent UPS activity in cellular proliferation and more specifically in the process of erythropoiesis. In cultured fibroblasts derived from embryos lacking Rad23b, proliferation rates were reduced. In fetal livers of Rad23b-null embryos, we observed reduced proliferation, accumulation of early erythroid progenitors, and a block during erythroid maturation. In primary wild-type (WT) erythroid cells, knockdown of Rad23b or chemical inhibition of the proteasome reduced survival and differentiation capability. Finally, the defects linked to Rad23b loss specifically affected fetal definitive erythropoiesis and stress erythropoiesis in adult mice. Together, these data indicate a previously unappreciated requirement for Rad23b and the UPS in regulation of proliferation in different cell types.
authors.affiliation: Department of Genetics, Erasmus MC, Rotterdam, The Netherlands.
authors.forename: Steven
authors.initials: S
authors.lastname: Bergink
authors.forename: Arjan F
authors.initials: AF
authors.lastname: Theil
authors.forename: Wendy
authors.initials: W
authors.lastname: Toussaint
authors.forename: Iris M
authors.initials: IM
authors.lastname: De Cuyper
authors.forename: Divine I
authors.initials: DI
authors.lastname: Kulu
authors.forename: Thomas
authors.initials: T
authors.lastname: Clapes
authors.forename: Reinier
authors.initials: R
authors.lastname: van der Linden
authors.forename: Jeroen A
authors.initials: JA
authors.lastname: Demmers
authors.forename: Eric P
authors.initials: EP
authors.lastname: Mul
authors.forename: Floris P
authors.initials: FP
authors.lastname: van Alphen
authors.forename: Jurgen A
authors.initials: JA
authors.lastname: Marteijn
authors.forename: Teus
authors.initials: T
authors.lastname: van Gent
authors.forename: Alex
authors.initials: A
authors.lastname: Maas
authors.forename: Catherine
authors.initials: C
authors.lastname: Robin
authors.forename: Sjaak
authors.initials: S
authors.lastname: Philipsen
authors.forename: Wim
authors.initials: W
authors.lastname: Vermeulen
authors.forename: James R
authors.initials: JR
authors.lastname: Mitchell
authors.forename: Laura
authors.initials: L
authors.lastname: Gutiérrez
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002454:Cell Differentiation / Q000235:genetics; D049109:Cell Proliferation; D002478:Cells, Cultured; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004622:Embryo, Mammalian / Q000166:cytology / Q000378:metabolism; D004912:Erythrocytes / Q000166:cytology / Q000378:metabolism; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000378:metabolism; D004920:Erythropoiesis / Q000235:genetics*; D005260:Female; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism; D005434:Flow Cytometry; D008099:Liver / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D046988:Proteasome Endopeptidase Complex / Q000235:genetics* / Q000378:metabolism; D011485:Protein Binding; D034622:RNA Interference
chemical_list: D004268:DNA-Binding Proteins; C499250:Rad23b protein, mouse; D046988:Proteasome Endopeptidase Complex; C061553:ATP dependent 26S protease
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