title: DNA damage measured using the alkaline elution assay depends on time between subculturing of cells and irradiation.
abstract: In experiments utilizing the alkaline filter elution assay for radiation-induced DNA damage we observed an unexpected dependence of hypoxic dose-response curves on the length of time V79 cells were in exponential growth between subculturing and irradiation. Dose-response curves for DNA from cells irradiated in air were identical regardless of whether the exponential-phase cells had been subcultured 24 or 48 h prior to irradiation, but cells irradiated in hypoxia 24 h after subculture displayed a dose-response curve for DNA damage which was two times steeper than that obtained for cells irradiated in hypoxia 48 h after subculture. Possible mechanisms for this effect are discussed.
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D000818:Animals; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D004247:DNA / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D066298:In Vitro Techniques; D008722:Methods; D013997:Time Factors
chemical_list: D004247:DNA