Non-dimer DNA damage in Chinese hamster V-79 cells exposed to ultraviolet-B light.
To understand and characterize non-dimer DNA damage and cytotoxicity induced by ultraviolet-B light (UV-B, 290-320 nm), an alkaline elution technique for analysis of DNA damage was used on Chinese hamster V-79 cells. Ultraviolet-B exposure produced a dose-dependent induction of DNA single strand breaks and DNA-protein crosslinks; however, there was an absence of DNA-DNA interstrand crosslinks. Neither of these types of DNA damage were repaired within a a 24 h incubation of the cells following a single UV-B exposure; rather the damage increased. Using a colony forming assay, we found that UV-B exposure resulted in an increase of cytotoxicity in a dose-dependent fashion. In addition, UV-B exposure inhibited DNA and RNA synthesis. The role of non-dimer DNA damage in the cytotoxicity induced by UV-B is discussed.
Matsumoto
K
K
Department of Medical Biochemistry, Kurume University School of Medicine, Japan.
Sugiyama
M
M
Ogura
R
R
D000818:Animals; D002449:Cell Aggregation / Q000187:drug effects; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D006224:Cricetinae; D003412:Cricetulus; D004249:DNA Damage; D004307:Dose-Response Relationship, Radiation; D011740:Pyrimidine Dimers; D014466:Ultraviolet Rays
D011740:Pyrimidine Dimers