Abstract
Galectin-3 (Gal-3) is a member of the carbohydrate-binding protein family that contributes to neoplastic transformation, tumor survival, angiogenesis, and metastasis. The aim of this study is to investigate the role of Gal-3 in human tongue cancer progression. Human tongue cancer cell lines (SCC-4 and CAL27) were transfected with a small-interfering RNA against Gal-3 (Gal-3-siRNA). The migration and invasion of the cells were examined using a scratch assay and BD BioCoat Matrigel Invasion Chamber, respectively. The mRNA and protein levels of β-catenin, Akt/pAkt, GSK-3β/pGSK-3β, MMP-9 in the cells were measured using RT-PCR and Western blotting, respectively. Transient silencing of Gal-3 gene for 48 h significantly suppressed the migration and invasion of both SCC-4 and CAL27 cells. Silencing of Gal-3 gene significantly decreased the protein level of β-catenin, leaving the mRNA level of β-catenin unaffected. Furthermore, silencing Gal-3 gene significantly decreased the levels of phosphorylated Akt and GSK-3β, and suppressed the mRNA and protein levels of MMP-9 in the cells. Our data suggest that Gal-3 mediates the migration and invasion of tongue cancer cells in vitro via regulating the Wnt/β-catenin signaling pathway and Akt phosphorylation.
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