Figure 1

Human CRC cells HCT116 were injected into the PVS of 2dpf zebrafish embryos. At 1dpi xenografts were submitted to 5FU chemotherapy (B), metformin (C), single radiation dose of 25Gy (D) or combinations of 25Gy+5FU (E) or 25Gy+MET (F). HCT116 xenografts were treated for 3 consecutive days and compared to non-irradiated and non-treated controls (A). Maximum Z projections of activated Caspase3 are shown in green (A’–F’). At 4dpi, cell proliferation (% mitotic figures), apoptosis (% activated Caspase3, green), and tumor size (number of tumor cells, DAPI, blue) were analyzed and quantified (G–I respectively). Results are the average of 2 independent experiments and are expressed as mean ± SEM. Each dot represents a xenograft and the total number of xenografts analyzed is indicated in the images (A–F). Dashed white line is delimitating the tumor of each xenograft. Scale bars represent 50µm. Statistical results: (ns) > 0.05, *P≦0.05, ****P≦0.0001. Results were compared with control with exception of those that have a bar to indicate the compared groups.