title: Single-strand breaks in DNA of various organs of mice induced by methyl methanesulfonate and dimethylsulfoxide determined by the alkaline unwinding technique.
abstract: The method for determination of single-strand breaks (SSB) in DNA by the technique of alkaline unwinding and hydroxylapatite chromatography has been applied for cell nuclei from organs of mice. Male mice were given methyl methane-sulfonate (MMS) and dimethylsulfoxide (DMSO) by i.p. administration. Cell nuclei were prepared from various organs and then lysed in alkali. The amount of DNA was determined by fluorometry using 4',6-diamidino-2-phenylindole.2HCl. The relative level of SSB in DNA was determined in various organs (liver, kidney, lung, spleen, testis and brain) 1-24 h after administration of the agent. After MMS-treatment the number of SSB in DNA increased to about the same extent in all organs 1 h post-treatment but then decreased by time. The SSB persisted for the longest time in brain- and lung-DNA. DMSO induced SSB only in DNA of kidney.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism* / Q000528:radiation effects; D004277:DNA, Single-Stranded / Q000032:analysis*; D004121:Dimethyl Sulfoxide / Q000633:toxicity*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008297:Male; D008741:Methyl Methanesulfonate / Q000633:toxicity*; D051379:Mice; D008815:Mice, Inbred Strains; D009691:Nucleic Acid Denaturation; D009928:Organ Specificity
chemical_list: D004277:DNA, Single-Stranded; D008741:Methyl Methanesulfonate; D004121:Dimethyl Sulfoxide