Adrián González-González 1,2 , Esperanza Muñoz-Muela 1,2 , Juan A Marchal 3,4 , Francisca E Cara 1,2 , Maria P Molina 1,2 , Marina Cruz-Lozano 1,2 , Gema Jiménez 3,4 , Akanksha Verma 5 , Alberto Ramírez 6 , Wei Qian 5 , Wen Chen 6 , Anthony J Kozielski 6 , Olivier Elemento 5 , María D Martín-Salvago 7 , Rafael J Luque 7 , Carmen Rosa-Garrido 8 , David Landeira 2,9 , María Quintana-Romero 2,9 , Roberto R Rosato 6 , Maria A García 10 , Cesar L Ramirez-Tortosa 7 , Hanna Kim 11 , Cristian Rodriguez-Aguayo 12 , Gabriel Lopez-Berestein 12 , Anil K Sood 12 , Jose A Lorente 2 , Pedro Sánchez-Rovira 1,2 , Jenny C Chang 6 , Sergio Granados-Principal 13,2,8 Show Affiliations »
Abstract
Purpose: On the basis of the identified stress-independent cellular functions of activating transcription factor 4 (ATF4), we reported enhanced ATF4 levels in MCF10A cells treated with TGFβ1. ATF4 is overexpressed in patients with triple-negative breast cancer (TNBC), but its impact on patient survival and the underlying mechanisms remain unknown. We aimed to determine ATF4 effects on patients with breast cancer survival and TNBC aggressiveness, and the relationships between TGFβ and ATF4. Defining the signaling pathways may help us identify a cell signaling-tailored gene signature.Experimental Design: Patient survival data were determined by Kaplan-Meier analysis. Relationship between TGFβ and ATF4, their effects on aggressiveness (tumor proliferation, metastasis, and stemness), and the underlying pathways were analyzed in three TNBC cell lines and in vivo using patient-derived xenografts (PDX).Results: ATF4 overexpression correlated with TNBC patient survival decrease and a SMAD-dependent crosstalk between ATF4 and TGFβ was identified. ATF4 expression inhibition reduced migration, invasiveness, mammosphere-forming efficiency, proliferation, epithelial-mesenchymal transition, and antiapoptotic and stemness marker levels. In PDX models, ATF4 silencing decreased metastases, tumor growth, and relapse after chemotherapy. ATF4 was shown to be active downstream of SMAD2/3/4 and mTORC2, regulating TGFβ/SMAD and mTOR/RAC1-RHOA pathways independently of stress. We defined an eight-gene signature with prognostic potential, altered in 45% of 2,509 patients with breast cancer.Conclusions: ATF4 may represent a valuable prognostic biomarker and therapeutic target in patients with TNBC, and we identified a cell signaling pathway-based gene signature that may contribute to the development of combinatorial targeted therapies for breast cancer. Clin Cancer Res; 24(22); 5697-709. ©2018 AACR. ©2018 American Association for Cancer Research.
Purpose: On the basis of the identified stress -independent cellular functions of activating transcription factor 4 (ATF4 ), we reported enhanced ATF4 levels in MCF10A cells treated with TGFβ1. ATF4 is overexpressed in patients with triple-negative breast cancer (TNBC), but its impact on patient survival and the underlying mechanisms remain unknown. We aimed to determine ATF4 effects on patients with breast cancer survival and TNBC aggressiveness , and the relationships between TGFβ and ATF4 . Defining the signaling pathways may help us identify a cell signaling-tailored gene signature.Experimental Design: Patient survival data were determined by Kaplan-Meier analysis. Relationship between TGFβ and ATF4 , their effects on aggressiveness (tumor proliferation, metastasis, and stemness), and the underlying pathways were analyzed in three TNBC cell lines and in vivo using patient -derived xenografts (PDX).Results: ATF4 overexpression correlated with TNBC patient survival decrease and a SMAD -dependent crosstalk between ATF4 and TGFβ was identified. ATF4 expression inhibition reduced migration, invasiveness, mammosphere-forming efficiency, proliferation, epithelial-mesenchymal transition, and antiapoptotic and stemness marker levels. In PDX models, ATF4 silencing decreased metastases , tumor growth, and relapse after chemotherapy. ATF4 was shown to be active downstream of SMAD2/3/4 and mTORC2 , regulating TGFβ/SMAD and mTOR /RAC1 -RHOA pathways independently of stress . We defined an eight-gene signature with prognostic potential, altered in 45% of 2,509 patients with breast cancer .Conclusions: ATF4 may represent a valuable prognostic biomarker and therapeutic target in patients with TNBC, and we identified a cell signaling pathway-based gene signature that may contribute to the development of combinatorial targeted therapies for breast cancer . Clin Cancer Res; 24(22); 5697-709. ©2018 AACR. ©2018 American Association for Cancer Research.
Entities: CellLine
Disease
Gene
Species
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Year: 2018
PMID： 30012564 DOI： 10.1158/1078-0432.CCR-17-3125
Source DB: PubMed Journal: Clin Cancer Res ISSN： 1078-0432 Impact factor: 12.531