Abstract
The present study investigates the effect of matrine on colon cancer cell viability and apoptosis and tumor growth in mice xenograft model. The results from MTT assay revealed a concentration and time dependent reduction in viability of HCT8 and HT29 colon cancer cells by matrine. The viability of HCT8 and HT29 cells was reduced to 24.67 and 29.32% on treatment with 4 µM/ml concentration of matrine after 48 h (P < 0.05). The results from flow cytometry revealed increase in population of HCT8 and HT29 cells to 77.6 ± 0.3 and 54.0 ± 5.4%, respectively compared to 1.4 ± 0.3 and 2.4 ± 0.7% in control on exposure to 1 µM/ml concentration of matrine. Histone H2AX phosphorylation and expression of Myt1, cyclin A2, cyclin B1 and p53 were increased in HCT8 and HT29 cells on treatment with matrine for 48 h. Matrine treatment also increased the phosphorylation of cdc2 significantly compared to control cells at 48 h (P < 0.05). Results from Annexin-V/FITC-staining showed increase in proportion of apoptotic cells in HCT8 and HT29 cells 67.52 and 68.56 on treatment with 1 µM/ml of matrine. Matrine treatment caused a marked reduction in the growth of HCT8 cell xenograft after 21 days. Thus matrine inhibits cell viability, induces apoptosis and inhibits tumor growth in colon cancer.
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