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Oncotarget. 2017 Dec 27;9(4):5111-5124. doi: 10.18632/oncotarget.23700. eCollection 2018 Jan 12.

Acquired resistance to tyrosine kinase inhibitors may be linked with the decreased sensitivity to X-ray irradiation.

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D. Rogachev Federal Research Center of Pediatric Hematology, Oncology and Immunology, Moscow 117198, Russia.
National Research Centre "Kurchatov Institute", Centre for Convergence of Nano-, Bio-, Information and Cognitive Sciences and Technologies, Moscow 123182, Russia.
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow 117997, Russia.
State Research Center-Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, Moscow 123098, Russia.
Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia.
Orekhovich Institute of Biomedical Chemistry, Moscow 119121, Russia.
OmicsWay Corp., Walnut, CA 91789, USA.
Clinical Center Vitamed, Moscow 121309, Russia.
Department of Biological Sciences, University of Lethbridge, Lethbridge, AB T1K3M4, Canada.
Department of Reproductive Medicine and Surgery, Moscow State University of Medicine and Dentistry, Moscow 127206, Russia.
Pathology Department, Morozov Children's City Hospital, Moscow 119049, Russia.
LLC "Solixant", Moscow 119991, Russia.
Republic Oncological Hospital, Petrozavodsk 185000, Russia.


Acquired resistance to chemotherapy and radiation therapy is one of the major obstacles decreasing efficiency of treatment of the oncologic diseases. In this study, on the two cell lines (ovarian carcinoma SKOV-3 and neuroblastoma NGP-127), we modeled acquired resistance to five target anticancer drugs. The cells were grown on gradually increasing concentrations of the clinically relevant tyrosine kinase inhibitors (TKIs) Sorafenib, Pazopanib and Sunitinib, and rapalogs Everolimus and Temsirolimus, for 20 weeks. After 20 weeks of culturing, the half-inhibitory concentrations (IC50) increased by 25 - 186% for the particular combinations of the drugs and cell types. We next subjected cells to 10 Gy irradiation, a dose frequently used in clinical radiation therapy. For the SKOV-3, but not NGP-127 cells, for the TKIs Sorafenib, Pazopanib and Sunitinib, we noticed statistically significant increase in capacity to repair radiation-induced DNA double strand breaks compared to naïve control cells not previously treated with TKIs. These peculiarities were linked with the increased activation of ATM DNA repair pathway in the TKI-treated SKOV-3, but not NGP-127 cells. Our results provide a new cell culture model for studying anti-cancer therapy efficiency and evidence that there may be a tissue-specific radioresistance emerging as a side effect of treatment with TKIs.


DNA repair; X-ray irradiation; drug resistance; serine and threonine kinase; tyrosine kinase

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