Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma ‑bearing mouse model.

Synergistic effects of tetrandrine combined with ionizing radiation on a murine colorectal carcinoma‑bearing mouse model. Oncol Rep. 2018 Jul 12;: Authors: Lin WC, Wang WH, Lin YH, Leu JD, Cheng SY, Chen YJ, Hwang JJ Abstract Tetrandrine (TET), a traditional Chinese clinical agent, has been used for the treatment of many diseases, including cancers. The purpose of the present study was to investigate the combined effects of TET and ionizing radiation (IR) on murine CT26 colorectal adenocarcinoma cells in vitro and in vivo. A CT26 cell line transfected with dual HSV‑1 thymidine kinase and firefly luciferase (luc) reporter genes was used. The half‑maximal inhibitory concentration (IC50) of TET in CT26/tk‑luc cells was ~10 µM. An additive effect was observed after combination of both agents based on a colony formation assay. Apoptosis and cleaved caspase‑3 levels were increased significantly in cells after combination treatment, as shown by flow cytometric analysis, DNA fragmentation and western blotting. However, tumor growth inhibition and therapeutic efficacy of TET combined with IR in vivo were identified to be synergistic, as monitored by tumor growth delay time, measured with a digital caliper. A significant inhibition of tumor growth was identified in the combination group compared with the radiation only group. Furthermore, non‑invasive bioluminescent imaging (BLI) and gamma scintigraphy were also used to evalua...
Source: Oncology Reports - Category: Cancer & Oncology Tags: Oncol Rep Source Type: research