title: Cytotoxicity and genotoxicity evaluation of organochalcogens in human leucocytes: a comparative study between ebselen, diphenyl diselenide, and diphenyl ditelluride.
abstract: Organochalcogens, particularly ebselen, have been used in experimental and clinical trials with borderline efficacy. (PhSe)2 and (PhTe)2 are the simplest of the diaryl dichalcogenides and share with ebselen pharmacological properties. In view of the concerns with the use of mammals in studies and the great number of new organochalcogens with potential pharmacological properties that have been synthesized, it becomes important to develop screening protocols to select compounds that are worth to be tested in vivo. This study investigated the possible use of isolated human white cells as a preliminary model to test organochalcogen toxicity. Human leucocytes were exposed to 5-50  μM of ebselen, (PhSe)2, or (PhTe)2. All compounds were cytotoxic (Trypan's Blue exclusion) at the highest concentration tested, and Ebselen was the most toxic. Ebselen and (PhSe)2 were genotoxic (Comet Assay) only at 50  μM, and (PhTe)2 at 5-50  μM. Here, the acute cytotoxicity did not correspond with in vivo toxicity of the compounds. But the genotoxicity was in the same order of the in vivo toxicity to mice. These results indicate that in vitro genotoxicity in white blood cells should be considered as an early step in the investigation of potential toxicity of organochalcogens.
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Diones
authors.initials: D
authors.lastname: Caeran Bueno
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Daiane Francine
authors.initials: DF
authors.lastname: Meinerz
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Josiane
authors.initials: J
authors.lastname: Allebrandt
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Emily Pansera
authors.initials: EP
authors.lastname: Waczuk
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Danúbia Bonfanti
authors.initials: DB
authors.lastname: dos Santos
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: Douglas Oscar Ceolin
authors.initials: DO
authors.lastname: Mariano
authors.affiliation: Laboratório de Bioquímica Toxicológica, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria 97105-900, RS, Brazil.
authors.forename: João Batista Teixeira
authors.initials: JB
authors.lastname: Rocha
mesh_terms: D001393:Azoles / Q000494:pharmacology*; D001555:Benzene Derivatives / Q000494:pharmacology*; D006801:Humans; D054833:Isoindoles; D007962:Leukocytes / Q000187:drug effects*; D009152:Mutagenicity Tests / Q000379:methods; D009153:Mutagens / Q000494:pharmacology*; D009942:Organometallic Compounds / Q000494:pharmacology*; D016566:Organoselenium Compounds / Q000494:pharmacology*
chemical_list: D001393:Azoles; D001555:Benzene Derivatives; D054833:Isoindoles; D009153:Mutagens; D009942:Organometallic Compounds; D016566:Organoselenium Compounds; C434247:diphenylditelluride; C061132:diphenyldiselenide; C042986:ebselen