Inhibitory effect of caffeic acid phenethyl ester on the growth of SW480 colorectal tumor cells involvesβ-catenin associated signaling pathway down-regulation

摘要

AIM: To study the anti-tumor effect of caffeic acid phenethyl ester (CAPE) and the influence of CAPE onβ-catenin associated signaling pathway in SW480 colorectal cancer (CRC) cells. METHODS: SW480 cells were treated with CAPE at serial concentrations. The proliferative status of cells was measured by methabenzthiazuron (MTT) assay. Cell cycle and cell apoptosis were analyzed using flow cytometry (FCM). Western blotting assay was used to evaluate the protein level ofβ-catenin, c-myc and cyclinDl. p-catenin localization was determined by indirect immunofluorescence. RESULTS: CAPE displayed a strong inhibitory effect in a significant dose- and time-dependent manner on SW480 cell growth. FCM analysis showed that the ratio of G0 /G1 phase cells increased, S phase ratio decreased and apoptosis rate increased after SW480 cells were exposed to CAPE for 24 h. Pretreatment of SW480 cells with CAPE significantly suppressed p-catenin, c-myc and cyclinD1 protein expression. CAPE treatment was associated with decreased accumulation ofβ-catenin protein in nucleus and cytoplasm, and concurrently increased its accumulation on the surface of cell membrane. CONCLUSION: CAPE can inhibit SW480 cell proliferation by inducing cell cycle arrest and apoptosis. Decreased p-catenin and the associated signaling pathway target gene expression may mediate the anti-tumor effects of CAPE.