Overcoming Resistance of Cancer Cells to PARP-1 Inhibitors with Three Different Drug Combinations
| Autor: | Liron Tuval-Kochen, Inbal Mazal, David Castel, Ginette Schiby, Joachim Yahalom, Shoshana Paglin, Osher Cohen, Itai Moshe, Ninette Amariglio, Raphael Pfeffer, Yaacov Richard Lawrence, Kineret Rosenblatt, Amos Toren, Sarit Aviel-Ronen, Gideon Rechavi, Camila Avivi, Michal Yalon |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Cancer Treatment lcsh:Medicine Drug resistance Pharmacology Poly (ADP-Ribose) Polymerase Inhibitor Biochemistry Negative Staining 0302 clinical medicine Animal Cells Eukaryotic initiation factor Breast Tumors Medicine and Health Sciences Group-Specific Staining Drug Interactions Post-Translational Modification Phosphorylation lcsh:Science Connective Tissue Cells Staining Multidisciplinary Histone deacetylase inhibitor Cell Staining 3. Good health Nucleic acids Oncology Connective Tissue 030220 oncology & carcinogenesis Prussian Blue Staining Cellular Types Anatomy medicine.drug Research Article DNA repair medicine.drug_class Biology Research and Analysis Methods 03 medical and health sciences Breast Cancer medicine Genetics Vorinostat Biology and life sciences lcsh:R Cancer Proteins Cancers and Neoplasms DNA Cell Biology Fibroblasts medicine.disease 030104 developmental biology Biological Tissue Specimen Preparation and Treatment Cancer cell lcsh:Q |
| Zdroj: | PLoS ONE PLoS ONE, Vol 11, Iss 5, p e0155711 (2016) |
| ISSN: | 1932-6203 |
| Popis: | Inhibitors of poly[ADP-ribose] polymerase 1 (PARPis) show promise for treatment of cancers which lack capacity for homologous recombination repair (HRR). However, new therapeutic strategies are required in order to overcome innate and acquired resistance to these drugs and thus expand the array of cancers that could benefit from them. We show that human cancer cell lines which respond poorly to ABT-888 (a PARPi), become sensitive to it when co-treated with vorinostat (a histone deacetylase inhibitor (HDACi)). Vorinostat also sensitized PARPis insensitive cancer cell lines to 6-thioguanine (6-TG)–a drug that targets PARPis sensitive cells. The sensitizing effect of vorinostat was associated with increased phosphorylation of eukaryotic initiation factor (eIF) 2α which in and of itself increases the sensitivity of cancer cells to ABT-888. Importantly, these drug combinations did not affect survival of normal fibroblasts and breast cells, and significantly increased the inhibition of xenograft tumor growth relative to each drug alone, without affecting the mice weight or their liver and kidney function. Our results show that combination of vorinostat and ABT-888 could potentially prove useful for treatment of cancer with innate resistance to PARPis due to active HRR machinery, while the combination of vorinostat and 6-TG could potentially overcome innate or acquired resistance to PARPis due to secondary or reversal BRCA mutations, to decreased PARP-1 level or to increased expression of multiple drug resistant proteins. Importantly, drugs which increase phosphorylation of eIF2α may mimic the sensitizing effect of vorinostat on cellular response to PARPis or to 6-TG, without activating all of its downstream effectors. |
| Databáze: | OpenAIRE |
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