Laurence Albiges1, Aïcha Goubar2, Véronique Scott2, Cécile Vicier2, Céline Lefèbvre2, Samar Alsafadi2, Frédéric Commo2, Mahasti Saghatchian1, Vladimir Lazar3, Philippe Dessen3, Suzette Delaloge4, Fabrice André5, Virginie Quidville2. 1. Department of Medical Oncology, Villejuif F-94800, France. 2. Institut National de la Santé et de la Recherche Médicale (INSERM) UMR981, Villejuif F-94800, France. 3. Plateforme de Biologie Intégrée, Institut de cancérologie Gustave Roussy, Villejuif F-94800, France. 4. Department of Medical Oncology, Villejuif F-94800, France; Institut National de la Santé et de la Recherche Médicale (INSERM) UMR981, Villejuif F-94800, France. 5. Department of Medical Oncology, Villejuif F-94800, France; Institut National de la Santé et de la Recherche Médicale (INSERM) UMR981, Villejuif F-94800, France. Electronic address: fabrice.andre@gustaveroussy.fr.
Abstract
OBJECTIVES: Bioinformatics analyses of pathways and genes differentially expressed between malignant and benign lesions could allow discovering new therapeutic targets. Here, we identified Checkpoint kinase 1 (Chk1) as a potent therapeutic target in triple-negative breast cancer (TNBC). MATERIALS AND METHODS: Differential gene expression between TNBC, other malignant and benign lesions was performed on two breast cancer datasets. Chk1 was targeted using RNA interference or chemical inhibitor in several TNBC cell lines. RESULTS: DNA repair pathway was identified as one mostly deregulated pathway in TNBC as compared to benign lesions. Chk1 was identified as candidate target among the 35 genes included in this pathway. Gene expression analysis revealed that Chk1 gene was significantly overexpressed in TNBC as compared to non-TNBC and benign lesions. Depletion of Chk1 protein expression induced a marked reduction of cell viability and led to mitotic catastrophe in TNBC cells. Chemical Chk1 inhibitor decreased survival in TNBC cells, and transcriptome analyze revealed a modulation of gene expression profile in response to Chk1 treatment. CONCLUSION: These findings suggest that Chk1 may represent a therapeutic target in TNBC, and provide a rationale to evaluate Chk1 inhibitors in breast cancer patients.
OBJECTIVES: Bioinformatics analyses of pathways and genes differentially expressed between malignant and benign lesions could allow discovering new therapeutic targets. Here, we identified Checkpoint kinase 1 (Chk1) as a potent therapeutic target in triple-negative breast cancer (TNBC). MATERIALS AND METHODS: Differential gene expression between TNBC, other malignant and benign lesions was performed on two breast cancer datasets. Chk1 was targeted using RNA interference or chemical inhibitor in several TNBC cell lines. RESULTS: DNA repair pathway was identified as one mostly deregulated pathway in TNBC as compared to benign lesions. Chk1 was identified as candidate target among the 35 genes included in this pathway. Gene expression analysis revealed that Chk1 gene was significantly overexpressed in TNBC as compared to non-TNBC and benign lesions. Depletion of Chk1 protein expression induced a marked reduction of cell viability and led to mitotic catastrophe in TNBC cells. Chemical Chk1 inhibitor decreased survival in TNBC cells, and transcriptome analyze revealed a modulation of gene expression profile in response to Chk1 treatment. CONCLUSION: These findings suggest that Chk1 may represent a therapeutic target in TNBC, and provide a rationale to evaluate Chk1 inhibitors in breast cancerpatients.
Authors: Patrick H Dinkelborg; Meng Wang; Liliana Gheorghiu; Joseph M Gurski; Theodore S Hong; Cyril H Benes; Dejan Juric; Rachel B Jimenez; Kerstin Borgmann; Henning Willers Journal: Breast Cancer Res Treat Date: 2019-01-03 Impact factor: 4.872
Authors: Eric W Prince; Ilango Balakrishnan; Monil Shah; Jean M Mulcahy Levy; Andrea M Griesinger; Irina Alimova; Peter S Harris; Diane K Birks; Andrew M Donson; Nathan Davidson; Marc Remke; Michael D Taylor; Michael H Handler; Nicholas K Foreman; Sujatha Venkataraman; Rajeev Vibhakar Journal: Oncotarget Date: 2016-08-16