ABSTRACT
AIM:To investigate the effect of interleukin-6 (IL-6) on epithelial-mesenchymal transition (EMT) , migration and invasion of papillary thyroid carcinoma TPC-1 cells by inducing the expression of long noncoding RNA lnc TCF7.METHODS:The effects of IL-6 on the expression of lnc TCF7 in the TPC-1 cells were detected by RT-q PCR after the TPC-1 cells were treated with IL-6 at 0, 5, 10, 20 and 50μg/L for 24 h or with IL-6 at 50μg/L for 0, 6, 12 and 24 h.After the TPC-1 cells were treated with IL-6 at 50μg/L for 24 h, the effect of IL-6 on the protein expression of E-cadherin and vimentin in the TPC-1 cells was detected by Western blot.The TPC-1 cell line with lnc TCF7 over-expression was established, and the effects of lnc TCF7 over-expression on EMT, migration and invasion of the TPC-1 cells were measured by Western blot and Transwell assay.After knockdown of lnc TCF7 expression and exposure to IL-6 at 50μg/L, the effects of lnc TCF7 on EMT, migration and invasion of TPC-1 cells treated with IL-6 were observed.RESULTS:The expression of lnc TCF7 in the TPC-1 cells was induced by IL-6 in a dose-and time-dependent manner.The expression of E-cadherin was down-regulated, the expression of vimentin was up-regulated, and the migration and invasion abilities of the TPC-1 cells were enhanced by lnc TCF7 over-expression (P<0.05).The expression of E-cadherin was decreased, the expression of vimentin, Snail and Slug was increased, and the migration and invasion abilities of the TPC-1 cells and intercellular space were enhanced by IL-6.The above changes induced by IL-6 were significantly inhibited by knockdown of lnc TCF7expression.CONCLUSION:IL-6 promotes the EMT, migration and invasion of papillary thyroid carcinoma TPC-1 cells by inducing the expression of lnc TCF7.