title: The effect on sister-chromatid exchanges of drugs and dyes by intercalation and photoactivation.
abstract: Intercalating dyes (acridine orange, proflavin and methylene blue) and drugs (chlorpromazine, promazine and chlorprothixene) were tested for their ability to induce sister-chromatid exchanges (SCEs) with and without photoactivation by visible light. Whereas in the dark all substances tested increased the frequency of SCEs, a superimposed effect of visible light on SCE formation was observed for the acridines proflavin and acridine orange, but not for the pheneothiazine derivatives methylene blue and chlorpromazine. These results are discussed in connection with the known mutagenic effects of these substances and with the factors that may be involved in SCE formation induced by intercalating molecules in the absence and presence of visible light.
mesh_terms: D000166:Acridines / Q000494:pharmacology; D000818:Animals; D014150:Antipsychotic Agents / Q000494:pharmacology*; D002460:Cell Line; D002746:Chlorpromazine / Q000494:pharmacology; D002749:Chlorprothixene / Q000494:pharmacology; D002869:Chromosome Aberrations; D002875:Chromosomes / Q000187:drug effects / Q000528:radiation effects; D004396:Coloring Agents / Q000494:pharmacology*; D006224:Cricetinae; D003434:Crossing Over, Genetic; D004305:Dose-Response Relationship, Drug; D008027:Light; D008751:Methylene Blue / Q000494:pharmacology; D011370:Proflavine / Q000494:pharmacology; D011395:Promazine / Q000494:pharmacology
chemical_list: D000166:Acridines; D014150:Antipsychotic Agents; D004396:Coloring Agents; D002749:Chlorprothixene; D011370:Proflavine; D011395:Promazine; D008751:Methylene Blue; D002746:Chlorpromazine