Overexpression of FOXO4 promotes apoptosis of laryngeal carcinoma cells by regulates Wnt/β-catenin signaling pathway / 中国耳鼻咽喉头颈外科

ABSTRACT

OBJECTIVE To investigate the effect of FOXO4 on proliferation and apoptosis of laryngeal carcinoma cells.METHODS The expression of FOXO4 in laryngeal carcinoma tissues and adjacent tissues was detected by Western blot.Laryngeal carcinoma cells were transfected with FOXO4 overexpression vector (p-EGFP-C1/FOXO4 group) and empty vector (p-EGFP-C1 group),while the non transfection group was established,and transfection reagent was only added in the non transfection group.The level of FOXO4 protein in transfected cells was detected by Western blot.Cell proliferation was detected by MTT,apoptosis was detected by flow cytometry.The levels of Cleaved Caspase-3,Caspase-3,Cleaved Caspase-9,β-catenin,Wntl were detected by Western blot.The transfected laryngeal carcinoma cells with p-EGFP-C1/FOXO4 was activated by Wnt/β-catenin signal pathway activator (activator group),and the proliferation and apoptosis of the cells were detected.RESULTS The expression level of FOXO4 in laryngeal carcinoma tissues was significantly lower than that in adjacent tissues (P=0.000).The expression level of FOXO4 in p-EGFP-C1/FOXO4 group was significantly higher than that in non transfection group (P=0.000).The survival rate and the expression levels of β-catenin and Wnt1 in p-EGFP-C1/FOXO4 group were significantly lower than those in the non transfection group (P=0.002,P=0.004,P=0.006).Cell apoptosis rate and expression levels of Cleaved Caspase-3,Caspase-3,Cleaved Caspase-9,Caspase-9 in p-EGFP-C1/FOXO4 group were significantly higher than those in non transfection group (P=0.002,P=0.001,hP＜0.05,P=0.004,jP＜0.05).Wnt/β-catenin signaling pathway activator can partly reverse the proliferation inhibition and apoptosis promoting effect of FOXO4.CONCLUSION FOXO4 could promote the apoptosis of human laryngeal carcinoma cells and inhibit the proliferation of laryngeal cancer cells.The mechanism may be related to the signal pathway of Wnt/β-catenin.