Knockdown of the M2 Isoform of Pyruvate Kinase (PKM2) with shRNA Enhances the Effect of Docetaxel in Human NSCLC Cell Lines In Vitro.
10.3349/ymj.2016.57.6.1312
- Author:
Sujuan YUAN
1
;
Tiankui QIAO
;
Xibing ZHUANG
;
Wei CHEN
;
Na XING
;
Qi ZHANG
Author Information
1. Department of Oncology, Jinshan Hospital, Medical Center of Fudan University, Shanghai, China. qiaotk@163.com
- Publication Type:Original Article
- Keywords:
The M2 isoform of pyruvate kinase;
shRNA;
non-small cell lung cancer;
chemotherapy;
docetaxel;
cell cycle;
apoptosis
- MeSH:
Apoptosis;
Blotting, Western;
Carcinoma, Non-Small-Cell Lung;
Cell Cycle;
Cell Line*;
Cell Survival;
Drug Therapy;
Flow Cytometry;
Humans*;
In Vitro Techniques*;
Lung Neoplasms;
Methods;
Plasmids;
Pyruvate Kinase*;
Pyruvic Acid*;
Real-Time Polymerase Chain Reaction;
RNA, Messenger;
RNA, Small Interfering*;
Transfection
- From:Yonsei Medical Journal
2016;57(6):1312-1323
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The aim of our study was to explore the relationships between the M2 isoform of pyruvate kinase (PKM2) and the sensitivity of human non-small cell lung cancer (NSCLC) cells to docetaxel in vitro. MATERIALS AND METHODS: With the method of plasmid transfection, we silenced the expression of PKM2 successfully in A549 and H460 cells. Western blotting and real-time PCR were applied to detect PKM2 expression at protein and gene levels. Cell viability was examined by CCK8 assay. Cell cycle distribution and apoptosis were examined by flow cytometry. P21 and Bax were detected. RESULTS: Expression of PKM2 mRNA and protein were significantly decreased by shRNA targeting PKM2. Silencing of PKM2 increased docetaxel sensitivity of human NSCLC A549 and H460 cells in a collaborative manner, resulting in strong suppression of cell viability. The results of flow cytometric assays suggested that knockdown of PKM2 or docetaxel treatment, whether used singly or in combination, blocked the cells in the G2/M phase, which is in consistent with the effect of the two on the expression of p21. Cells with PKM2 silencing were more likely to be induced into apoptosis by docetaxel although knockdown of PKM2 alone can't induce apoptosis significantly, which is in consistent with the effect of the two on Bax expression. CONCLUSION: The results suggest that PKM2 knockdown could serve as a chemosensitizer to docetaxel in non-small lung cancer cells through targeting PKM2, leading to inhibition of cell viability, increase of cell arrest of G2/M phase and apoptosis.
