SNAI1, a zinc-finger
transcription factor, plays an important role in the induction of epithelial-mesenchymal transition (EMT) in various
cancers. However, the possible functions of SNAI1 in the proliferation and apoptosis of
hepatocellular carcinoma have not been clearly identified. In this study, we investigated the effects and mechanisms of SNAI1 in the proliferation and apoptosis of
hepatocellular carcinoma using clinical samples and cell lines. We found that SNAI1 is highly expressed in the tissues of
liver cancer compared with adjacent nontumor tissues. SNAI1 is also highly expressed in the
hepatoma cell lines HepG2, SMMC-7721, and BEL-7402 compared with the human normal liver cell line L02. We also observed that SNAI1 expression was correlated with distal
metastasis, incomplete
tumor capsule formation, and histological differentiation in
hepatocellular carcinoma (HCC). Moreover, we demonstrated that knockdown of SNAI1 via lentiviral vectors of RNAi against SNAI inhibited cell proliferation by inducing G1 arrest, which was accompanied by the downregulation of
cyclin D1 but not that of
cyclin A. In addition, knockdown of SNAI1 promoted apoptosis by decreasing the expression of Bcl-2. In conclusion, our findings revealed that SNAI1 is involved in the development of
hepatocellular carcinoma via regulating the growth and apoptosis of
tumor cells.