title: Haematoporphyrin derivative photosensitization and gamma-radiation damage interaction in Chinese hamster ovary fibroblasts.
abstract: The interaction of haematoporphyrin derivative (HPD) photosensitization and gamma-irradiation was studied with regard to clonogenicity of Chinese hamster ovary (CHO) fibroblasts. Exposure to either treatment alone resulted in shouldered response curves. Exposure to 4.2 Gy gamma-radiation immediately before graded doses of visible light had no effect on the shape of the visible-light survival curve; similarly, exposure to 8.75 kJ/m2 light immediately before graded doses of gamma-radiation had no effect on the shape of the gamma-radiation response curve. These data indicate that damage due to gamma-radiation and HPD photosensitization did not interact, suggesting that the mechanisms of cell killing are different.
mesh_terms: D000818:Animals; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000528:radiation effects*; D006224:Cricetinae; D005720:Gamma Rays; D006414:Hematoporphyrin Photoradiation; D010778:Photochemotherapy