title: [Protective effect of caffeine on chromosomal structures of mammalian cells irradiated with UV-rays].
abstract: The effect of caffeine (2mM) on the frequency of structural mutations induced by UV light (lambda = 265 nm at an incident dose of 40 erg/mm2) in the primary culture of mouse embryonic fibroblasts is studied. A half-hour treatment with caffeine of cells at the time of the first mitosis metaphase decreased approximately by 2 times the frequency of chromosome aberrations induced by UV light at the S stage and observed at the metaphase of this or the next C-mitosis. The frequency of both breaks and exchanges decreased as the result of caffeine treatment. The persistence of the protective effect of caffeine at the time of the second C-mitosis suggests that the observed decrease of the aberration rate is accompanied by the true reparation of pre-mutational lesions in chromosomes; the nature of the reparative process and the time when it takes place is as yet not clear. Caffeine did not decrease the frequency of spontaneous structural mutations.
mesh_terms: D000818:Animals; D002110:Caffeine / Q000627:therapeutic use*; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D002875:Chromosomes / Q000528:radiation effects; D051379:Mice; D011833:Radiation Injuries, Experimental / Q000517:prevention & control*; D011837:Radiation-Protective Agents; D014466:Ultraviolet Rays
chemical_list: D011837:Radiation-Protective Agents; D002110:Caffeine
vernacular_title: Zashchitnoe deĭstvie koveina na khromosomnye struktury kletok mlekopitaiushchikh, obluchennykh UF-luchami