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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Avaliação do imunoblot no diagnóstico da cisticercose bovina / Evaluation of the imunoblotting for the bovine cysticercosis diagnosis

Girotto, Aline 17 July 2007 (has links)
Made available in DSpace on 2015-03-26T13:46:33Z (GMT). No. of bitstreams: 1 texto completo.pdf: 928214 bytes, checksum: f836c005563b3eda57ceef56008490fb (MD5) Previous issue date: 2007-07-17 / The bovine cisticercosis is an illness caused by the larva of Taenia saginata called Cysticercus bovis. Recently the implementation of immunologic tests has been suggested as alternative for the diagnosis of the illness, amongst these tests the Immunoblotting, that basically detect antibodies in the serum. The present work objectives the evaluation of the Immunoblotting performance in the immunodiagnosis of bovine cisticercosis as well as of Taenia saginata and Taenia crassiceps antigens. The Taenia saginata antigens (Tsag) was gotten from the calves through the experimental infection and the Taenia crassiceps (LVcra and Tcra) antigen was gotten through experimental infection in mice balb/c. The antigens had been tested in four groups of Immunoblot control-serum: 28 samples of animals experimentally infected, 32 from naturally infected animals, 28 samples without illnesses and 19 samples with other pathologies. The peptides that had only reacted with the positive serum had been selected and identified as important, observing the localization criteria (molecular weight) as well as its physical appearance, particularly the color intensity. Related to these characteristics, valid for three tested antigens, the bands of 4-6, 14 and 18KDa had been distinguished between the others, showing the highest taxes of performance and a differentiated profile, with bigger area and height, similar to a spot. The 4-6KDa peptides presented the taxes of 66.7, 66.7 and 50% of sensitivity and 97.5, 84.6 and 96.2% of specificity when used the LVcra, Tcra and Tsag antigens, respectively. The 14KDa peptide presented 87.5, 87.5 and 77.8% of sensitivity and 97.5 94.9 and 100% of specificity with the LVcra, Tcra and Tsag antigens, respectively. The 18KDa peptide presented for LVcra, Tcra and Tsag, respectively, 75, 41.7 and 88.9% sensitivity values and 97.5, 89.7 and 92.3% of specificity. Crossed reactions with other illnesses between the three antigenic preparations and the 4-6, 14 and 18KDa peptides had not been observed. The values reached in this experiment indicate that the peptides with molecular weight of 4-6, 14 and 18KDa, can be considered important in the diagnosis of bovine cisticercosis. Low sensitivity values of Immunoblot had been observed when serum of animals with natural infection, generally discrete, had been considered. On the other hand, serum samples of antibodies from the studied bovines demonstrated high taxes of performance in the recognition of the 4-6, 14 and 18 Kda peptides, what characterize the test qualitatively, becoming it useful for the diagnosis of cisticercosis, as well as teste antigens. / A cisticercose bovina é uma doença causada pela larva de Taenia saginata, denominada Cysticercus bovis. Recentemente, tem sido sugerida, como alternativa para o diagnóstico da doença, a implementação de testes imunológicos, dentre eles o Imunoblot, que tem por princípio a detecção de anticorpos no soro. O presente trabalho objetiva a avaliação do desempenho do imunoblot no imunodiagnóstico da cisticercose bovina, bem como, dos antígenos de Taenia saginata e Taenia crassiceps. Os antígenos de Taenia saginata (Tsag) foram obtidos através da infecção experimental dos bezerros e os de Taenia crassiceps (LVcra e Tcra), através da infecção experimental em camundongos balb/c. Os antígenos foram testados no Immunoblotting frente a quatro grupos de soros-controle: 28 amostras de soro de animais experimentalmente infectados, 32 de animais naturalmente infectados, 28 sem doenças e 19 com outras patologias. Foram selecionados os peptídeos que reagiram somente com os soros positivos, os quais foram identificados como importantes, observando os critérios de localização (peso molecular), bem como sua aparência física, particularmente a intensidade de cor. As bandas de 4-6, 14 e 18KDa destacaram-se entre as outras, mostrando as mais altas taxas de desempenho e um perfil diferenciado, com área e altura maiores, semelhantes a uma mancha. Os peptídeos de 4-6KDa apresentaram as taxas de 66,7, 66,7 e 50% de sensibilidade e 97,5, 84,6 e 96,2% de especificidade quando utilizados os antígenos LVcra, Tcra e Tsag, respectivamente. O peptídeo de 14KDa apresentou 87,5, 87,5 e 77,8% de sensibilidade e 97,5 94,9 e 100% de especificidade com os antígenos LVcra , Tcra e Tsag , respectivamente. O peptídeo de 18KDa apresentou para LVcra, Tcra e Tsag, respectivamente, valores de 75, 41,7 e 88,9% de sensibilidade e 97,5, 89,7 e 92,3% de especificidade. Não foram observadas reações cruzadas com outras doenças entre as três preparações antigênicas e os peptídeos de 4-6, 14 e 18KDa. Os valores alcançados neste experimento indicam que os peptídeos com peso molecular de 4-6, 14 e 18KDa, podem ser considerados importantes no diagnóstico da cisticercose bovina. Observaram-se baixos valores de sensibilidade do imunoblot quando se consideraram soros de animais com infecção natural, geralmente discreta. Por outro lado, as altas taxas de desempenho demonstradas no reconhecimento dos peptídeos de 4-6, 14 e 18KDa, pelos anticorpos presentes nas amostras de soros dos bovinos estudados, caracterizam qualitativamente o teste, tornando-o útil no diagnóstico da cisticercose.

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