[Effect of silencing Bmi-1 expression in reversing cisplatin resistance in lung cancer cells and its mechanism].
Nan Fang Yi Ke Da Xue Xue Bao
; 34(7): 1000-4, 2014 Jun.
Article
in Zh
| MEDLINE
| ID: mdl-25057072
ABSTRACT
OBJECTIVE:
To investigate the effect of silencing Bmi-1 expression in reversing cisplatin resistance in human lung cancer cells and explore the possible mechanisms.METHODS:
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 ß-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.RESULTS:
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.CONCLUSION:
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.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cisplatin
/
Drug Resistance, Neoplasm
/
Gene Silencing
/
Polycomb Repressive Complex 1
/
Lung Neoplasms
Limits:
Humans
Language:
Zh
Journal:
Nan Fang Yi Ke Da Xue Xue Bao
Year:
2014
Document type:
Article