Effect of c?Met inhibitor AMG?102 on radiosensitivity in laryngeal squamous carcinoma cells
10.3760／cma.j.issn.0253?3766.2019.12.006
- VernacularTitle:c-Met抑制剂AMG-102增强喉鳞癌细胞放射敏感性的机制
- Author:
Feng CAO
1
;
Xin LYU
;
Kaifeng DONG
;
Cai FAN
;
Jianjun ZHANG
;
Kun CHEN
;
Bojing MA
;
Chunli HOU
;
Cuihong ZHANG
Author Information
1. 河北医科大学第四医院放疗科
- Keywords:
Laryngeal squamous cell carcinoma;
c?Met;
AMG?102;
Cell proliferation;
Apoptosis;
Radiosensitivity
- From:
Chinese Journal of Oncology
2019;41(12):909-917
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of c?Met inhibitor AMG?102 on proliferation and radiosensitivity in laryngeal squamous carcinoma cells. Methods The effects of AMG?102 on proliferation and radiosensitivity of laryngeal squamous carcinoma cell lines Hep?2 and KBV200 were detected by 3?(4,5?dimethy?2?thiazolyl)?2, 5?diphenyl?2H tetrazolium bromide ( MTT ) assay and colony formation assay, respectively. The apoptosis of Hep?2 and KBV200 cells was detected by flow cytometry.The expression levels of c?Met, phospho?Met (p?Met), cleaved caspase?3 and Akt／p?Akt, Erk／p?Erk were detected by Western blot. Specific small interfering RNA targeting c?Met or plasmid of c?Met were transfected into Hep?2 and KBV200 cells to investigate the cell sensitivity to AMG?102. Results Compared with KBV200 cells, Hep?2 cells were more sensitive to AMG?102 with IC50 of 14 and 9 μmol／L, respectively. The relative expression levels of c?Met and p?Met proteins in Hep?2 cells were 194.48±0.57 and 177.76±1.53, respectively, which were significantly higher than those in KBV200 cells ( 171.24 ± 1.00 and 115.37 ± 0.56, respectively, P＜0.001 for both). Exogenous hepatocyte growth factor (HGF) was added to increase the expression level of p?Met protein in KBV200 cells.The results showed that AMG?102 significantly reduced the expression of p?Met in KBV200 cells treated with HGF ( P＜0.001). Compared with the dimethyl sulfoxide ( DMSO) group, AMG?102 treatment combined with radiotherapy significantly increased the radiosensitivity of Hep?2 cells ( SER＝1.28, P＜0.001). However, AMG?102 had little effect on the radiosensitivity of KBV200 cells (SER＝1.18, P＝0.002). Compared with the 4 Gy radiotherapy alone group and the 5 μmol／L of AMG?102 alone treatment group, the apoptosis rate of Hep?2 cells in the combined treatment group was significantly increased. Meanwhile, the expression level of cleaved caspase?3 protein was also markedly increased. However, there were no significant changes in the apoptotic rate and cleaved caspase?3 expression in each treatment group of KBV200 cells. Compared with DMSO treatment group, the expression levels of p?Met, p?Akt and p?Erk were significantly decreased in the 4 Gy radiotherapy group, 5 μmol／L of AMG?102 treatment group and combined treatment group of Hep?2 cells. And the levels of p?Met, p?Akt and p?Erk in the combined treatment group were significantly lower than those in the 4 Gy radiotherapy alone group and 5 μmol／L of AMG?102 treatment alone group. By contrast, in KBV200 cells, the expression of p?Met, p?Akt and p?Erk in each group was not changed. The relative expression of p?Met in Hep?2 cells before and after radiotherapy at 30 min, 1 h, 4 h, 8 h, 24 h were 99.89±0.61, 138.62±1.00, 163.07±5.00, 87.80±1.85, 90.67±0.65 and 94.09±1.41, respectively. The level of p?Met was slightly increased after radiotherapy at 30 min and 1 h (P＜0.001 for all), whereas it was significantly decreased from 4 h to 24 h after radiotherapy (P＜0.05 for all). By contrast, the expression of p?Met in KBV200 cells did not change with time after radiotherapy (P＞0.05). The sensitivity of Hep?2 cells to AMG?102 was decreased after silencing of c?Met, while the sensitivity of KBV200 cells to AMG?102 was not significantly changed ( P＞0.05). Moreover, the radiosensitivity of Hep?2 cells in c?Met knockdown group had a slightly increasing trend ( SER＝1.07, P＝0.068). After the treatment with 10 μmol／L of AMG?102, the proliferation rate of c?Met ectopically expressed KBV200 cells was 60.05%± 3.23%, It was significantly lower than that of the blank control 90.08%±1.04% and siRNA negative control (90.12%±1.01%, P＜0.001). The results suggested that the overexpression of c?Met in KBV200 cells increased the radiosensitivity to AMG?102, whereas depletion of c?Met resulted in resistance to AMG?102 in Hep?2 cells. Furthermore, the radiosensitivity of KBV200 cells that overexpressed c?Met showed a decreased trend (SER＝0.7, P＝0.005). Conclusions c?Met inhibitor AMG?102 has a significant inhibitory effect on the proliferation of c?Met overexpressing laryngeal squamous carcinoma cells, leading to increased radiosensitivity. It suggests that molecular targeted therapy against c?Met receptor is more effective in c?Met overexpressed subtype of laryngeal squamous cell carcinoma.
