口腔鳞状细胞癌细胞TLR3表达及其配体poly(I:C)的诱导凋亡作用

目的研究口腔鳞状细胞癌细胞中Toll样受体3(TLR3)的表达及其配体poly(I:C)的生物学作用。方法 RT-PCR和流式细胞术检测口腔鳞状细胞癌细胞系CAL-27和HB中TLR3mRNA和蛋白表达。以100μg/mLpoly(I:C)处理CAL-27,分别于刺激后24、48和72h时点采用MTT比色法测定细胞活力,24h时点采用流式细胞术检测细胞凋亡;并设立空白对照。结果 CAL-27和HB中TLR3mRNA和蛋白均呈高表达。CAL-27经poly(I:C)处理后,各检测时点的细胞活力均显著低于空白对照细胞(P<0.05);细胞凋亡率明显高于空白对照细胞[(16.67±1.202)%vs(7.00±1.155)%](P<0.05)。结论口腔鳞状细胞癌细胞内高表达TLR3,其配体poly(I:C)能诱导口腔鳞状细胞癌细胞凋亡。

Expression of TLR3 in oral squamous carcinoma cells and induction of apoptosis by its ligand poly (I:C)

Objective To investigate the expression of Toll-like receptor 3 (TLR3) and the biological characteristics of its ligand poly (I:C) in oral squamous carcinoma cells. Methods The expression of TLR3 mRNA and protein in oral squamous carcinoma CAL-27 cells and HB cells was detected by RT-PCR and flow cytometry. CAL-27 cells were treated with 100 μg/mL poly (I:C), cell viability was determined by MTT assay at 24, 48 and 72 h after stimulation, and cell apoptosis was detected by flow cytometry. Besides, blank controls were established. Results TLR3 mRNA and protein were highly expressed in CAL-27 and HB cells. After treatment by poly (I:C), the viability of CAL-27 cells was significantly lower than that of blank controls at each time point (P<0.05), and the apoptosis rate of CAL-27 cells was significantly higher than that of blank controls [(16.67±1.202）% vs (7.00±1.155)%]（P<0.05）. Conclusion TLR3 is highly expressed in oral squamous carcinoma cells, and its ligand poly(I:C) can induce the apoptosis of oral squamous carcinoma cells.