Effect of NLK on the proliferation and invasion of laryngeal carcinoma cells by regulating CDCP1.

OBJECTIVE:The morbidity and mortality of laryngeal cancer are increasing rapidly, seriously threatening human health. There are several causes of laryngeal cancer, but the exact molecular mechanism is unclear. Finding the molecular targets of laryngeal cancer has become an emerging hot spot. Nemo-like kinase (NLK) is abnormally expressed in tumors, but its role in laryngeal cancer has not been reported. PATIENTS AND METHODS:Real Time PCR and Western blot were used to detect NLK mRNA and protein expression in cancer tissues and adjacent tissues of laryngeal cancer patients. The laryngeal carcinoma cell line Hep-2 cells were cultured in vitro and randomly divided into three groups: control group, NC group, and NLK siRNA group followed by the analysis of cell proliferation by MTT assay, Caspase3 activity, and cell invasion by the transwell chamber. MMP-9 and CDCP1 expression was measured by Western blot. RESULTS:NLK mRNA and protein expression was significantly increased in laryngeal carcinoma tissues compared with those in adjacent tissues (p<0.05). NLK siRNA transfection into Hep-2 cells significantly down-regulated NLK expression, inhibited Hep-2 cell proliferation and invasion, increased Caspase-3 activity with statistical differences compared to control group (p<0.05). Down-regulation of NLK expression in Hep-2 cells inhibited MMP-9 expression and decreased CDCP1 expression. CONCLUSIONS:NLK is expressed in tumor tissues of patients with laryngeal cancer. The down-regulation of NLK expression may play a role in the proliferation, apoptosis, and invasion of laryngeal carcinoma cells and it is possible by regulating MMP-9 and CDCP1 expression.

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