Abstract
ent-Sauchinone, a lignan isolated from Saururus chinensis (Lour.) Baill., was reported that it could modulate the expression of signal transducer and activator of transcription 3 (STAT3). Since STAT3 plays a key role in invasion, migration, and metastasis of cancer, we investigated whether ent-sauchinone could exert promising inhibitory effects on the invasion and migration of the metastatic human liver cancer cell line SMMC-7721 in the present study. ent-Sauchinone was extracted from dried herbs of Saururus chinensis (Lour.) Baill. Human liver cancer cell lines SMMC-7721 and HCCLM3 were used to test the effect of ent-sauchinone on cell viability. The IC50 values and time-dependent effect of ent-sauchinone were determined by MTT assay. Cell migration and invasion of SMMC-7721 were evaluated by the wound healing test and transwell assay respectively, the known anti-metastasis agent curcumin was used as a positive control. Western blotting assay was used to investigate relevant molecular mechanisms of cell invasion and migration. Though ent-sauchinone didn't show high cytotoxicity, the wound healing assay and transwell migration assay revealed a profound impairment in the metastatic potential of SMMC-7721 cells due to down-regulation of N-cadherin, MMP-2, and MMP-9 proteins induced by inhibiting the phosphorylation of STAT3. These findings suggest that ent-sauchinone could be used as a promising agent to treat cancer metastasis.
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