Expression of miR-126-3p in thyroid cancer and function research / 中国免疫学杂志

ABSTRACT

Objective:To investigate the expression of miR-126-3p in thyroid cancer and the biological function.Methods:The expression of miR-126-3p in thyroid carcinoma,adjacent tissues and three types of thyroid cancer cells(TPC-1,FTC-133,8505C) were detected by RT-PCR;thyroid cancer cells were divided into analogue group(mimic) and control group(NC),which were respectively with the transfection of miR-126-3p mimic and negative control plasmid.The proliferation and apoptosis in two groups were respectively detected by Brdu-ELISA and flow cytometry.The migration and invasion were detected by Transwell Chambers method.Results:The expression of miR-126-3p in thyroid carcinoma was significantly lower than adjacent tissues(0.384±0.028 vs 0.981±0.039,t=10.291,P<0.05);the expression of miR-126-3p in TPC-1 was the lowest among three types of thyroid cancer cells.Compared with NC group,the proliferation of TPC-1 in mimic group was significantly inhibited,the same with migration(26.68±4.48 vs 82.21±3.65,t=17.789,P<0.05)and invasion(12.28±1.03 vs 34.43±2.10,t=8.103,P<0.05),which the apoptosis was significantly increased[(15.32±3.20)% vs (8.12±1.17)%,t=4.623,P<0.05].Conclusion:The miR-126-3p expression is reduced in thyroid cancer tissue,overexpression of miR-126-3p significantly suppresses the proliferation,migration and invasion of thyroid cancer cells,and promotes the apoptosis,miR-126-3p can play an important biological function as a cancer suppressor gene in thyroid cancer.