Associação entre os níveis de resíduos piretróides e graus de agressividade dos carcinomas mamários espontâneos de cadelas
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Data
2011-05-13
Autores
Colodel, Marcia Moleta [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Dos tumores diagnosticados nas cadelas as neoplasias mamárias apresentam a maior incidência. Essas neoplasias podem ser influenciadas por fatores internos e externos como os contaminantes ambientais. Apesar das evidências da toxicidade dos piretróides, seu potencial cancerígeno ainda não foi suficientemente esclarecido, havendo a necessidade de investigação de sua participação no câncer de mama. Este estudo teve por objetivo investigar possíveis relações entre resíduos de piretróides e carcinoma de mama espontâneo de cadelas correlacionando-os com o grau de agressividade da neoplasia. Foram selecionadas 50 cadelas divididas em cinco grupos com 10 animais cada. O Grupo Controle foi formado por cadelas que apresentavam diagnóstico negativo para neoplasia em mama; os grupos Luminal A, Luminal B, Superexpressão de HER-2 e Basal foram formados por cadelas que apresentaram carcinoma em mama classificado pela imunoistoquimica como Luminal A, Luminal B, Superexpressão de HER-2 e Basal, respectivamente. O grau de agressividade dos carcinomas foi avaliado por imunoistoquímica mediante a expressão de HER-2, p63 e receptor de Estrógeno. A determinação da concentração de resíduos piretróides aletrina, cipermetrina, deltametrina e tetrametrina da mama e do tecido adiposo adjacente à mama foi realizada por Cromatografia Líquida de Alta Eficiência. A intensidade de dano no DNA foi avaliada pelo Teste do Cometa. Das 50 cadelas, seis apresentaram resíduos de um ou mais piretróides nas amostras das mamas avaliadas e 10 apresentaram resíduos desse inseticida nas amostras de tecido adiposo. O piretróide mais frequente foi a deltametrina. A distribuição de cada resíduo investigado entre os grupos avaliados e entre as amostras de mama e de tecido adiposo em um mesmo animal foi heterogênea. Não há evidência estatística de que os piretróides estejam envolvidos na...
From all tumors that are diagnosed in female dog, the mammary neoplasia is the one that has the highest incidence. This sort of neoplasia may be influenced by both internal and external factors. Good examples of external factors are the environment contaminants. In spite of knowing the evidences of pyrethroid toxicity, it is not sufficiently clarified yet its cancer potential, thus leaving room for further investigation regarding its participation in the mammary tumor formation. This study aims at investigating not only the possible relationships between pyrethroid residue and spontaneous mammary carcinoma in female dog, but also correlating the degree of aggressiveness of such neoplasia. 50 female dog were selected and divided into five groups containing 10 animals each. Control group contained female dog that presented negative results for mammary neoplasia; female dog that presented mammary carcinoma and were immunohistochemically diagnosed as Luminal A, Luminal B, HER-2 Super-expression and Basal, were divided into groups bearing their respective tumor name. Carcinoma aggressiveness degree was immunohistochemically assessed concerning its expression of HER-2, p63 and Estrogen receptor. In order to define pyrethroid residue concentration for alethrin, cypermethrin, deltamethrin, and tetramethrin on mammary and mammary adjacent adipose tissue it was performed High-Performance Liquid Chromatography. The intensity of DNA damage was assessed via Comet Assay. From the 50 female dog, six have presented residue of one or more pyrethroids in mammary samples, and 10 presented residue of this insecticide in adipose tissue samples. The most frequently found pyrethroid residue was deltamethrin. Residue distribution among groups, and both mammary and adipose tissue of the same individual presented heterogeneous results. There is no statistical evidence showing that pyrethroids may be involved in ... (Complete abstract click electronic access below)
From all tumors that are diagnosed in female dog, the mammary neoplasia is the one that has the highest incidence. This sort of neoplasia may be influenced by both internal and external factors. Good examples of external factors are the environment contaminants. In spite of knowing the evidences of pyrethroid toxicity, it is not sufficiently clarified yet its cancer potential, thus leaving room for further investigation regarding its participation in the mammary tumor formation. This study aims at investigating not only the possible relationships between pyrethroid residue and spontaneous mammary carcinoma in female dog, but also correlating the degree of aggressiveness of such neoplasia. 50 female dog were selected and divided into five groups containing 10 animals each. Control group contained female dog that presented negative results for mammary neoplasia; female dog that presented mammary carcinoma and were immunohistochemically diagnosed as Luminal A, Luminal B, HER-2 Super-expression and Basal, were divided into groups bearing their respective tumor name. Carcinoma aggressiveness degree was immunohistochemically assessed concerning its expression of HER-2, p63 and Estrogen receptor. In order to define pyrethroid residue concentration for alethrin, cypermethrin, deltamethrin, and tetramethrin on mammary and mammary adjacent adipose tissue it was performed High-Performance Liquid Chromatography. The intensity of DNA damage was assessed via Comet Assay. From the 50 female dog, six have presented residue of one or more pyrethroids in mammary samples, and 10 presented residue of this insecticide in adipose tissue samples. The most frequently found pyrethroid residue was deltamethrin. Residue distribution among groups, and both mammary and adipose tissue of the same individual presented heterogeneous results. There is no statistical evidence showing that pyrethroids may be involved in ... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Mamas - Cancer, Piretroides, Cão - Doenças, Mammary neoplasia, Pyrethroids
Como citar
COLODEL, Marcia Moleta. Associação entre os níveis de resíduos piretróides e graus de agressividade dos carcinomas mamários espontâneos de cadelas. 2011. 87 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, 2011.