Effect of silencing Bmi-1 expression in reversing cisplatin resistance in lung cancer cells and its mechanism / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1000-1004, 2014.
Artículo
en Chino
| WPRIM
| ID: wpr-312650
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effect of silencing Bmi-1 expression in reversing cisplatin resistance in human lung cancer cells and explore the possible mechanisms.</p><p><b>METHODS</b>Cisplatin-resistant A549/DDP cells with small interference RNA (siRNA)-mediated Bmi-1 expression silencing were examined for cisplatin sensitivity using MTT assay and alterations in cell cycle distribution and apoptosis with flow cytometry, and the changes in cell senescence was assessed using β-galactosidase staining. The protein expressions of Bmi-1, P14(ARF), P16(INK4a), P53, P21, Rb and ubi-H2AK119 in the cells were determined with Western blotting.</p><p><b>RESULTS</b>A549/DDP cells showed significantly higher Bmi-1 expression than A549 cells. After siRNA-mediated Bmi-1 silencing, A549/DDP cells showed significantly enhanced cisplatin sensitivity with an increased IC50 from 40.3±4.1 µmol/L to 18.3±2.8 µmol/L (P<0.01) and increased cell percentage in G0/G1 phase from (48.9±2.3)% to (78.7±7.6)% (P<0.01). Silencing Bmi-1 did not cause significant changes in the cell apoptosis rate but induced obvious senescence phenotype in A549/DDP cells with down-regulated expression of ubi-H2AK119 and up-regulated expressions of P14(ARF), P16(INK4a), P53, P21 and Rb.</p><p><b>CONCLUSION</b>Silencing Bmi-1 by RNA interference can induce cell senescence and resensitize A549/DDP cells to cisplatin possibly by regulating INK4a/ARF/Rb senescence pathway.</p>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Farmacología
/
Ciclo Celular
/
Cisplatino
/
Apoptosis
/
Resistencia a Antineoplásicos
/
Silenciador del Gen
/
ARN Interferente Pequeño
/
Línea Celular Tumoral
/
Complejo Represivo Polycomb 1
/
Genética
Límite:
Humanos
Idioma:
Chino
Revista:
Journal of Southern Medical University
Año:
2014
Tipo del documento:
Artículo
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