Abstract
Abstract Hagan, M., Wang, L., Hanley, J. R., Park, J. S. and Dent, P. Ionizing Radiation-Induced Mitogen-Activated Protein (MAP) Kinase Activation in DU145 Prostate Carcinoma Cells: MAP Kinase Inhibition Enhances Radiation-Induced Cell Killing and G2/M-Phase Arrest. These studies examine the role(s) played by the mitogen-activated protein kinase (MAPK) pathway after exposure of DU145 prostate carcinoma cells to radiation. Radiation (2 Gy) was found to cause both immediate primary (0–30 min) and prolonged secondary activations (90–1440 min) of the MAPK pathway. These activations of the MAPK pathway were abolished by inhibition of epidermal growth factor receptor (EGFR) function. The secondary activation was also abolished by addition of a neutralizing monoclonal antibody against transforming growth factor α (TGFA). Activation of the MAPK pathway could be induced in nonirradiated cells by the transfer of medium from irradiated cultures. Neutralizing antibody to TGFA blocked this effect, indicating that radi...
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