Inhibiting polo-like kinase 1 enhances radiosensitization via modulating DNA repair proteins in non-small-cell lung cancer.
Biochem Cell Biol
; 96(3): 317-325, 2018 06.
Article
em En
| MEDLINE
| ID: mdl-29040814
ABSTRACT
To assure faithful chromosome segregation, cells make use of the spindle assembly checkpoint, which can be activated in aneuploid cancer cells. In this study, the efficacies of inhibiting polo-like kinase 1 (PLK1) on the radiosensitization of non-small-cell lung cancer (NSCLC) cells were studied. Clonogenic survival assay was performed to identify the effects of the PLK1 inhibitor on radiosensitivity within NSCLC cells. Mitotic catastrophe assessment was used to measure the cell death and histone H2AX protein (γH2AX) foci were utilized to assess the DNA double-strand breaks (DSB). The transcriptome was analyzed via unbiased profiling of microarray expression. The results showed that the postradiation mitotic catastrophe induction and the DSB repair were induced by PLK1 inhibitor BI-6727, leading to an increase in the radiosensitivity of NSCLC cells. BI-6727 in combination with radiation significantly induced the delayed tumor growth. PLK1-silenced NSCLC cells showed an altered mRNA and protein expression related to DNA damaging, replication, and repairing, including the DNA-dependent protein kinase (DNAPK) and topoisomerase II alpha (TOPO2A). Furthermore, inhibition of PLK1 blocked 2 important DNA repair pathways. To summarize, our study showed PLK1 kinase as an option in the therapy of NSCLC.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Proteínas Proto-Oncogênicas
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Proteínas Serina-Treonina Quinases
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Carcinoma Pulmonar de Células não Pequenas
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Proteínas de Ciclo Celular
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Reparo do DNA
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Quebras de DNA de Cadeia Dupla
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Neoplasias Pulmonares
Limite:
Humans
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article