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Background  Nasopharyngeal carcinoma (NPC) is known for its high incidence of neck lymph node metastasis, which represents poor prognosis. The present study aimed to examine the anti-metastatic properties of  Selaginella tamariscina  extract (STE) in human nasopharyngeal carcinoma HONE-1 cells  in vitro .    Methods  Cell viability was examined by MTT assay, whereas cell motility was measured by invasive, migration and would healing assays. Real-time PCR, and promoter assays confirmed the inhibitory effects of STE on matrix metalloproteinase-9 (MMP-9) mRNA level in HONE-1 cells.    Results  The STE inhibits 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced HONE-1 cell migration and invasion in a concentration-dependent manner. By zymographic and Western blot analyses, STE was shown to inhibit the activities and expression of MMP-9. Treatment of STE on TPA-induced HONE-1 cells inhibited MMP-9 expression and ERK1/2 phosphorylation without affecting JNK and p38 phosphorylation.    Conclusions  STE inhibits MMP-9 expression and HONE-1 cell metastasis. Its inhibitory effects may involve the Src/FAK/ERK 1/2 pathway. STE may have the potential of being an anti-metastatic agent against NPC.

bmc complementary and alternative medicine

Selaginella tamariscina extract suppresses TPA-induced invasion and metastasis through inhibition of MMP-9 in human nasopharyngeal carcinoma HONE-1 cells