Yue LEI, Jie WAN, Dandan LI, et al. Down-regulation of FoxM1 enhances sensitivity of human nasopharyngeal carcinoma cells to paclitaxel via activation of JNK/mitochondrial pathway[J]. Journal of Third Military Medical University, 2018, 40(9): 780-787.
DOI:
Yue LEI, Jie WAN, Dandan LI, et al. Down-regulation of FoxM1 enhances sensitivity of human nasopharyngeal carcinoma cells to paclitaxel via activation of JNK/mitochondrial pathway[J]. Journal of Third Military Medical University, 2018, 40(9): 780-787. DOI: 10.16016/j.1000-5404.201711248.
Down-regulation of FoxM1 enhances sensitivity of human nasopharyngeal carcinoma cells to paclitaxel via activation of JNK/mitochondrial pathway
To determine the effects of down-regulating Forkhead box M1 gene (FoxM1) on the proliferation
apoptosis and sensitivity to paclitaxel in human nasopharyngeal carcinoma cell line HONE-1
and investigate the possible molecular mechanism.
Methods
2
A sequence-specific small interfering RNA (siRNA) targeting FoxM1 was used to transfect HONE-1 cells
then the expression of FoxM1 was detected by quantitative reverse transcription-PCR (qRT-PCR)
RT-PCR and Western blotting.The proliferation and chemosensitivity to paclitaxel cells were detected by MTT assay.Flow cytometry was adopted to measure the cell cycle distribution of transfected HONE-1 cells.The apoptotic rates were examined by Annexin V-FITC/PI staining assay.And the expression levels of Ki67
Cyclin E1
multidrug resistance 1 (MDR1)
c-Jun N-terminal kinase (JNK)
p-JNK
c-Jun
p-c-Jun
and apoptosis-related proteins Bax and Bcl-2 were detected by Western blotting.
Results
2
FoxM1-siRNA transfection decreased the expression level of FoxM1 gene in HONE-1 cells obviously (
P
<
0.01).Compared with the control cells
the transfected HONE-1 cells had markedly decreased proliferation rate (
P
<
0.05)
much lower Ki67 expression (
P
<
0.05)
increased percentage of the cells in G
1
phase (
P
<
0.01) while less cells in S phase (
P
<
0.05)
and down-regulated expression of Cyclin E1 (
P
<
0.01).Meanwhile the apoptotic rate was significantly higher in the siRNA/paclitaxel cells than negative and blank control/paclitaxel cells (
P
<
0.01).What's more
the transfection obviously decreased the MDR1 level (
P
<
0.05)
and significantly enhanced the sensitivity of HONE-1 cells to paclitaxel (
P
<
0.01)
when compared with the control groups.In siRNA/paclitaxel group
the expression levels of p-JNK1
p-c-Jun and Bax were much higher than the negative control/paclitaxel group (all
P
<
0.01)
whereas that of Bcl-2 was down-regulated (
P
<
0.01).
Conclusion
2
The siRNA targeting FoxM1 in HONE-1 cells could effectively regulate the activity of JNK/mitochondrial pathway
inhibit the proliferation
promote the apoptosis
and ultimately enhance the sensitivity to paclitaxel.
关键词
Keywords
references
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