BACKGROUND AND PURPOSE: Radiotherapy (RT) is vital for the treatment of locally advanced non-small cell lung cancer (NSCLC), yet its delivery is limited by tolerances of adjacent organs. We sought therefore to identify and characterize gene targets whose inhibition may improve RT. MATERIALS AND METHODS: Whole genome pooled shRNA cytotoxicity screens were performed in A549 and NCI-H460 using a retroviral library of 74,705 sequences. Cells were propagated with or without daily radiation Monday-Friday. Radiosensitization by top differential dropout hits was assessed by clonogenic assays. Apoptosis was assessed using a caspase 3/7 cell-based activity assay and by annexin V-FITC and PI staining. MCL1 expression was assessed by qPCR and Western blotting. RESULTS: USP9X, a deubiquitinase, was a top hit among druggable gene products. WP1130, a small molecule USP9X inhibitor, showed synergistic cytotoxicity with IR. MCL1, an anti-apoptotic protein deubiquitinated by USP9X, decreased with USP9X inhibition and IR. This was accompanied by increases in caspase 3/7 activity and apoptosis. In a panel of NSCLC lines, MCL1 and USP9X protein and gene expression levels were highly correlated. Lines showing high levels of MCL1 expression were the most sensitive to USP9X inhibition. CONCLUSIONS: These data support the use of MCL1 expression as a predictive biomarker for USP9X inhibitors in NSCLC therapy.
BACKGROUND AND PURPOSE: Radiotherapy (RT) is vital for the treatment of locally advanced non-small cell lung cancer (NSCLC), yet its delivery is limited by tolerances of adjacent organs. We sought therefore to identify and characterize gene targets whose inhibition may improve RT. MATERIALS AND METHODS: Whole genome pooled shRNA cytotoxicity screens were performed in A549 and NCI-H460 using a retroviral library of 74,705 sequences. Cells were propagated with or without daily radiation Monday-Friday. Radiosensitization by top differential dropout hits was assessed by clonogenic assays. Apoptosis was assessed using a caspase 3/7 cell-based activity assay and by annexin V-FITC and PI staining. MCL1 expression was assessed by qPCR and Western blotting. RESULTS:USP9X, a deubiquitinase, was a top hit among druggable gene products. WP1130, a small molecule USP9X inhibitor, showed synergistic cytotoxicity with IR. MCL1, an anti-apoptotic protein deubiquitinated by USP9X, decreased with USP9X inhibition and IR. This was accompanied by increases in caspase 3/7 activity and apoptosis. In a panel of NSCLC lines, MCL1 and USP9X protein and gene expression levels were highly correlated. Lines showing high levels of MCL1 expression were the most sensitive to USP9X inhibition. CONCLUSIONS: These data support the use of MCL1 expression as a predictive biomarker for USP9X inhibitors in NSCLC therapy.
Authors: Yang Xie; Monika Avello; Markus Schirle; Elizabeth McWhinnie; Yan Feng; Eva Bric-Furlong; Christopher Wilson; Robin Nathans; Jing Zhang; Marc W Kirschner; Shih-Min A Huang; Feng Cong Journal: J Biol Chem Date: 2012-11-26 Impact factor: 5.157
Authors: Pedro A Pérez-Mancera; Alistair G Rust; Louise van der Weyden; Glen Kristiansen; Allen Li; Aaron L Sarver; Kevin A T Silverstein; Robert Grützmann; Daniela Aust; Petra Rümmele; Thomas Knösel; Colin Herd; Derek L Stemple; Ross Kettleborough; Jacqueline A Brosnan; Ang Li; Richard Morgan; Spencer Knight; Jun Yu; Shane Stegeman; Lara S Collier; Jelle J ten Hoeve; Jeroen de Ridder; Alison P Klein; Michael Goggins; Ralph H Hruban; David K Chang; Andrew V Biankin; Sean M Grimmond; Lodewyk F A Wessels; Stephen A Wood; Christine A Iacobuzio-Donahue; Christian Pilarsky; David A Largaespada; David J Adams; David A Tuveson Journal: Nature Date: 2012-04-29 Impact factor: 49.962
Authors: Jordi Barretina; Giordano Caponigro; Nicolas Stransky; Kavitha Venkatesan; Adam A Margolin; Sungjoon Kim; Christopher J Wilson; Joseph Lehár; Gregory V Kryukov; Dmitriy Sonkin; Anupama Reddy; Manway Liu; Lauren Murray; Michael F Berger; John E Monahan; Paula Morais; Jodi Meltzer; Adam Korejwa; Judit Jané-Valbuena; Felipa A Mapa; Joseph Thibault; Eva Bric-Furlong; Pichai Raman; Aaron Shipway; Ingo H Engels; Jill Cheng; Guoying K Yu; Jianjun Yu; Peter Aspesi; Melanie de Silva; Kalpana Jagtap; Michael D Jones; Li Wang; Charles Hatton; Emanuele Palescandolo; Supriya Gupta; Scott Mahan; Carrie Sougnez; Robert C Onofrio; Ted Liefeld; Laura MacConaill; Wendy Winckler; Michael Reich; Nanxin Li; Jill P Mesirov; Stacey B Gabriel; Gad Getz; Kristin Ardlie; Vivien Chan; Vic E Myer; Barbara L Weber; Jeff Porter; Markus Warmuth; Peter Finan; Jennifer L Harris; Matthew Meyerson; Todd R Golub; Michael P Morrissey; William R Sellers; Robert Schlegel; Levi A Garraway Journal: Nature Date: 2012-03-28 Impact factor: 49.962
Authors: Georg Karpel-Massler; Matei A Banu; Chang Shu; Marc-Eric Halatsch; Mike-Andrew Westhoff; Jeffrey N Bruce; Peter Canoll; Markus D Siegelin Journal: Oncotarget Date: 2016-03-15