Matrine suppresses stemness of hepatocellular carcinoma cells by regulating β-catenin signaling pathway

Abstract

To explore the effects of matrine on the proliferation, tumor cell stemness, β-catenin transcriptional activity and AKT/GSK3β/β-catenin signaling pathway in human hepatocellular carcinoma (HCC) HepG2 and Huh7 cells. The proliferation and colony formation ability of HepG2 and Huh7 cells treated with 200, 400, and 800 μg/mL matrine were evaluated with MTT assay and colony formation assay, respectively. Real-time quantitative PCR was performed to detect the mRNA expressions of CD90, epithelial cell adhesion molecule (EpCAM) and CD133, and dual-luciferase assay was used to detect the transcriptional activity of β-catenin in the treated cells. The effects of matrine on the expressions of protein kinase B (AKT), P-AKT, GSK-3β, P-GSK-3β, P-β-catenin and β-catenin proteins in the Wnt/β-catenin signaling pathway were assessed using Western blotting. Matrine inhibited the proliferation of the two HCC cell lines in a time- and concentration-dependent manner. The half-inhibitory concentrations of matrine were 2369, 1565 and 909.1 μg/mL at 24, 48 and 72 h in HepG2 cells, respectively, and were 1355, 781.8, and 612.8 μg/mL in Huh7 cells, respectively. Matrine concentrationdependently suppressed colony formation of the HCC cells, producing significant inhibitory effects at 400 μg/mL P < 0.01) and 800 μg/mL P < 0.001) in HepG2 cells and at 200 μg/mL P < 0.05), 400 μg/mL P < 0.01), and 800 μg/mL P < 0.001) in Huh7 cells. Matrine at 400 and 800 μg/mL significantly inhibited the mRNA expression of CD90, EpCAM and CD133 and the transcriptional level of β-catenin in both HepG2 and Huh7 cells P < 0.05 or 0.01). Matrine at 400 and 800 μg/mL also significantly decreased the protein levels of β-catenin, P-AKT and P-GSK-3β and increased the phosphorylation level of β-catenin in both of the cell lines. Matrine inhibits the proliferation, colony formation, and the expressions of tumor stem cell markers CD90, EpCAM and CD133 in both HepG2 and Huh7 cells probably by inhibiting Wnt/β-catenin signaling pathway and the transcriptional activity ofβ-catenin.