Abstract: Objective To investigate the mechanism of matrine inhibiting the proliferation and migration of thyroid cancer cell line TPC-1 through down-regulated miRNA-182-5p TPC-1. Methods TPC-1 cells were transfected after 24 hours with 0.5 mg/mL matrine or without 0.5 mg/mL matrine, the experiments were divided into: inhibitor-NC, inhibitor against miR-182-5p (inhibitor), mimic-NC, miRNA-182-5p-mimics, mimic-NC+matrine and miR-182-5p- mimics+matrine. miR-182-5p, E-cadherin, N-cadherin and vinmentin gene were detected by PCR. TPC-1 cells proliferation and migration were detected using CCK-8 and Transwell assay. The expression of E-cadherin、N-cadherin and vinmentin protein was determined by Western blot. Results Compared with Nthy-ori3-1 (NT), miR-182-5p was highly expressed in TPC-1 cells (P＜0.01); down-regulation to the expression of miRNA-182-5p inhibited the proliferation and migration of TPC-1 cells (P＜0.01); Compared to the 0 mg/mL matrine group, 0.5 mg/mL matrine significantly reduced the miR-182-5p level (P＜0.05) and inhibited proliferation, migration of TPC-1 cells and also reduced N-cadherin and vinmentin expression but increased E-cadherin expression in TPC-1 cells (P＜0.01); Over-expression of miR-182-5p partly abolished the matrine-inhibited proliferation and migration of TPC-1 cells and the increased E-cadherin expression, decreased miR-182-5p,N-cadherin and vinmentin expression (P＜0.01). Conclusions Matrine is a potential therapeutic drug for papillary thyroid carcinoma (PTC) and miR-182 may be an effective target for the treatment of PTC.

Key words: matrine, miR-182-5p, proliferation, migration, papillary thyroid cancer