Expression of mir-34c-5p and mir-150-5pin nasopharyngeal carcinoma and up-regulated expression after invasion and apoptosis of nasopharyngeal carcinoma cells

Objective MiRNAs are closely related to tumors,and we hypothesized there is specific miR expression in nasopharyngeal carcinoma(NPC).We intended to investigate the expression of mir-34c-5p and mir-150-5p in NPC and to investigate the effects of mir-34c-5p and mir-150-5p on apoptosis and invasion following up-regulated expression in HNE1 NPC cells.Methods MiR-34c-5p and miR-150-5p expression levels in 30 individual cases of NPC and nasopharyngitis were detected with gene chip and qRT-PCR techniques.miR-34c-5p and miR-150-5p were transfected into the NPC cell line HNE1 via liposomes.Their expression levels were detected with qRT-PCR,apoptosis was evaluated by flow cytometry,and invasion ability was assessed via Transwell migration assay.Results MiR-150-5p expression levels in NPC and nasopharyngitis were 0.165±0.092 and 1.062±0.280 respectively,and miR-34c-5p expression levels in NPC and nasopharyngitis were 0.417±0.220 and 1.385±0.739,respectively,which indicated miR-34c-5p and miR-150-5p were weakly expressed in NPC.Apoptosis rates in HNE1 cells transfected by miR-34c-5p and miR-150-5p were increased,by 12.7%and 7.6%,respectively,which were significantly higher compared to blank control(3.9%).The Transwell assay demonstrated that invasive HNE1 cell counts were 32.00±2.00 and 28.33±2.08,respectively,compared to 60.66±8.50 in the blank control(P<0.001).Conclusion MiR-34c-5p and miR-150-5p are lowly expressed in NPC,and their down-regulation may be associated with NPC.