Leptomycin B reduces primary and acquired resistance of gefitinib in lung cancer cells.
Toxicol Appl Pharmacol
; 335: 16-27, 2017 11 15.
Article
em En
| MEDLINE
| ID: mdl-28942004
ABSTRACT
Epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI) gefitinib has demonstrated dramatic clinical efficacy in non-small cell lung cancer (NSCLC) patients. However, its therapeutic efficacy is ultimately limited by the development of acquired drug resistance. The aim of this study was to explore the potential utility of chromosome region maintenance 1 (CRM1) inhibitor leptomycin B (LMB) in combination with gefitinib to overcome primary and acquired gefitinib resistance in NSCLC cells. The combinative effects of gefitinib and LMB were evaluated by MTT and its underlining mechanism was assessed by flow cytometry and Western blot. LMB displayed a synergistic effect on gefitinib-induced cytotoxicity in A549 (IC50 25.0±2.1µM of gefitinib+LMB vs. 32.0±2.5µM of gefitinib alone, p<0.05). Gefitinib+LMB caused a significantly different cell cycle distribution and signaling pathways involved in EGFR/survivin/p21 compared with gefitinib. A549 cells then were treated with progressively increased concentrations of gefitinib (A549GR) or in combination with LMB (A549GLR) over 10months to generate gefitinib resistance. IC50 of gefitinib in A549GLR (37.0±2.8µM) was significantly lower than that in A549GR (53.0±3.0µM, p<0.05), which indicates that LMB could reverse gefitinib-induced resistance in A549. Further mechanism investigation revealed that the expression patterns of EGFR pathway and epithelial-mesenchymal transition (EMT) markers in A549, A549GR, and A549GLR were significantly different. In conclusion, LMB at a very low concentration (0.5nM) combined with gefitinib showed synergistic therapeutic effects and ameliorated the development of gefitinib-induced resistance in lung cancer cells.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Quinazolinas
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Protocolos de Quimioterapia Combinada Antineoplásica
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Sobrevivência Celular
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Resistencia a Medicamentos Antineoplásicos
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Inibidores de Proteínas Quinases
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Neoplasias Pulmonares
Limite:
Humans
Idioma:
En
Revista:
Toxicol Appl Pharmacol
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Estados Unidos