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Frendo-Cumbo S, Li T, Ammendolia DA, Coyaud E, Laurent EM, Liu Y, Bilan PJ, Polevoy G, Raught B, Brill JA, Klip A, Brumell JH. DCAF7 regulates cell proliferation through IRS1-FOXO1 signaling. iScience 2022; 25:105188. [PMID: 36248734 PMCID: PMC9556925 DOI: 10.1016/j.isci.2022.105188] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 07/13/2022] [Accepted: 09/20/2022] [Indexed: 12/13/2022] Open
Abstract
Cell proliferation is dependent on growth factors insulin and IGF1. We sought to identify interactors of IRS1, the most proximal mediator of insulin/IGF1 signaling, that regulate cell proliferation. Using proximity-dependent biotin identification (BioID), we detected 40 proteins displaying proximal interactions with IRS1, including DCAF7 and its interacting partners DYRK1A and DYRK1B. In HepG2 cells, DCAF7 knockdown attenuated cell proliferation by inducing cell cycle arrest at G2. DCAF7 expression was required for insulin-stimulated AKT phosphorylation, and its absence promoted nuclear localization of the transcription factor FOXO1. DCAF7 knockdown induced expression of FOXO1-target genes implicated in G2 cell cycle inhibition, correlating with G2 cell cycle arrest. In Drosophila melanogaster, wing-specific knockdown of DCAF7/wap caused smaller wing size and lower wing cell number; the latter recovered upon double knockdown of wap and dfoxo. We propose that DCAF7 regulates cell proliferation and cell cycle via IRS1-FOXO1 signaling, of relevance to whole organism growth.
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Affiliation(s)
- Scott Frendo-Cumbo
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Physiology, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Taoyingnan Li
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Dustin A. Ammendolia
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Etienne Coyaud
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
| | - Estelle M.N. Laurent
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada
| | - Yuan Liu
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Philip J. Bilan
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Gordon Polevoy
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada
| | - Brian Raught
- Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2C1, Canada,Department of Medical Biophysics, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - Julie A. Brill
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada,Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Amira Klip
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Physiology, University of Toronto, Toronto, ON M5G 1L7, Canada,Department of Biochemistry, University of Toronto, Toronto, ON M5G 1L7, Canada
| | - John H. Brumell
- Cell Biology Program, Hospital for Sick Children, Toronto, ON M5G 0A4, Canada,Department of Molecular Genetics, University of Toronto, Toronto, ON M5G 1L7, Canada,Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada,SickKids IBD Centre, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada,Corresponding author
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