title: Action spectra for killing and mutation of Chinese hamster cells exposed to mid- and near-ultraviolet monochromatic light.
abstract: We have examined the response of Chinese hamster V79 cells to monochromatic light of selected wavelengths in the mid- to near-UV region, using cell survival and induction of mutants resistant to 6-thioguanine (6-TG) or ouabain (OUA) as end points. As the wavelength increased from 313 to 405 nm, the induction of mutants resistant to 6-TG and to OUA decreased to a greater degree than did cell survival. Cells resistant to OUA were induced with considerably lesser efficiency at wavelengths of 313 and 334 nm than cells resistant to 6-TG. No mutants resistant to either 6-TG or OUA were induced by 405-nm light, and no mutants resistant to OUA were induced by 365-nm light. Thus, cell killing and mutation induction have different action spectra, and furthermore, action spectra for mutation induction at the HGPRT and Na+/K+-ATPase loci are different from each other. These observations imply important differences in the cellular mechanisms, and/or lesions, for cell inactivation, induction of 6-TG and OUA resistance for V79 cells exposed to near-UV monochromatic light.
mesh_terms: D000818:Animals; D002470:Cell Survival / Q000528:radiation effects*; D002478:Cells, Cultured; D006224:Cricetinae; D003412:Cricetulus; D004351:Drug Resistance / Q000528:radiation effects; D005260:Female; D007041:Hypoxanthine Phosphoribosyltransferase / Q000235:genetics; D009154:Mutation / Q000528:radiation effects*; D010042:Ouabain / Q000494:pharmacology; D010053:Ovary; D000254:Sodium-Potassium-Exchanging ATPase / Q000235:genetics; D013057:Spectrum Analysis; D013866:Thioguanine; D014466:Ultraviolet Rays
chemical_list: D010042:Ouabain; D007041:Hypoxanthine Phosphoribosyltransferase; D000254:Sodium-Potassium-Exchanging ATPase; D013866:Thioguanine