[No authors listed]
MicroRNA (miR)-19b is expressed in various types of tumors and may serve as a potential therapeutic target. The miRâ17â92 cluster is upregulated in nasopharyngeal carcinoma (NPC) tissues and cells. miRâ19b is a member of the miRâ17â92 cluster; however, its expression and function in NPC are largely unknown. The present study aimed to investigate the expression and function of miRâ19b in NPC cells. The miRCURY LNATM miRNA Inhibitor (miRâ19b inhibitor and negative control) were transfected into C666â1 cells. The proliferation, apoptosis and migration of the cells were subsequently detected by the Cell Counting Kitâ8 assay, flow cytometry and Transwell assay, respectively. Additionally, the expression of signaling pathwayâassociated proteins and suppressor of cytokine signaling 1 (SOCS1)] and the transcriptional targets of pduanyu18133 [Bclâ2, myeloid leukemia protein 1 (Mclâ1) and cyclin D1] were detected by western blotting. The miRâ19b inhibitor inhibited proliferation and migration and induced apoptosis of C666â1 cells. Furthermore, the miRâ19b inhibitor upregulated the expression of SOCS1, a predicted target gene of miRâ19b, and decreased the phosphorylation of duanyu18133 at Tyr705 and Ser727. These data indicated that upregulation of SOCS1, an endogenous inhibitor of duanyu18133 phosphorylation, attenuated the duanyu18133 signaling pathway in C666â1 cells. Moreover, the expression level of the proproliferative protein cyclin D1 and antiapoptotic proteins Mclâ1 and Bclâ2 was significantly decreased following transfection with the miRâ19b inhibitor. The aforementioned three proteins are downstream transcriptional targets of the activated duanyu18133 signaling pathway. The results of the present study revealed that inhibition of miRâ19b negatively modulated the malignant behavior of NPC cells via the duanyu18133 signaling pathway. Therefore, miRâ19b inhibition may serve as a novel therapeutic target for the treatment of NPC.
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