Ribosomal protein 16 overexpresses in prostate cancer and promotes tumor progression / 上海交通大学学报（医学版）

ABSTRACT

Objective·To investigate the effects of ribosomal protein 16 (RPS16) on tumorigenesis and development of prostate cancer.Methods·Westem blotting (WB) was used to detect the differences of RPS16 levels in 25 cases of prostate cancer tissues and 33 prostate hyperplasia,and immunohistochemistry (IHC) was performed to detect RPS16 levels in 48 prostate cancer tissues and 42 benign tissues.The relationship between RPS16 level and clinical pathological parameters of the patients was analyzed.The RPS16 small interfering RNA (siRNA) was transiently transfected into DU145 and LNCaP cells by liposome method,including RPS16-siRNA1,RPS16-siRNA2 and RPS16-siRNA3.Random disturbance RPS16-siRNANC was used as negative control,cells without transfection were blank control.The efficiency of RNA interference was detected by WB 48-72 h after transfection.RPS16-siRNA with highest efficiency was chosen for subsequent cell proliferation assay,flow cytometry (FCM) and transwell assay in order to detect the effects of RPS 16 on cell proliferation,cell cycle and invasion ability of DU 145 and LNCaP cells.Results·WB results showed that the level of RPS 16 protein in the tissues of prostate cancer was higher than that of the benign group (P=0.008).IHC results showed RPS 16 protein level was significantly higher in tumor tissues than benign tissues (P=0.009).RPS16 expression was not correlated with age and metastasis,but significantly correlated with clinical stage (P=0.044) and pathological grade of the tumor (P=0.004).RPS 16 siRNA can not only significantly reduce the expression of RPS16 protein in DU145 and LNCaP cells,but also inhibit the proliferation and invasion of the cancer cells,so that the cell cycle arrested in G2/M phase.Conclusion·The high expression of RPS 16 protein could enhance the proliferation and invasive ability of prostate cancer cells.