Detection of important peptides for bovine cysticercosis diagnosis in immunoblot/Deteccao de peptideos importantes para o diagnostico da cisticercose bovina no immunoblot

The diagnosis of cysticercosis in bovines that presents discreet infection is committed by the conventional methodology of detection employed in slaughterhouses. This deficiency leads to the development of alternative methods, such as immunoblot, in order to improve the detection of this disease. An...

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Veröffentlicht in:Ciência rural 2009-07, Vol.39 (4), p.1147
Hauptverfasser: Girotto, Aline, Pinto, Paulo Sergio de Arruda, Dias, Julio Cesar de Oliveira, Chaves, Leandro Siqueira, Ferreira, Hanna Carolina Campos
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Sprache:spa
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Zusammenfassung:The diagnosis of cysticercosis in bovines that presents discreet infection is committed by the conventional methodology of detection employed in slaughterhouses. This deficiency leads to the development of alternative methods, such as immunoblot, in order to improve the detection of this disease. An immunoblot assay was developed to detect peptides from Taenia crassiceps antigenand it was used to test 56 samples of bovine serum (28 confirmed as negative and 28 from experimentally infected animals with Taenia saginata eggs). The peptides 4-6, 14 and 18 kDa showed better performance in bovine cysticercosis diagnosis due to an enhanced appearance, once they showed higher area and wide, contrasting with medium and high molecular weight peptides, that showed unspecific reactions and discreet appearance. The obtained results indicated that immunoblot can represent a potential alternative in bovine cysticercosis diagnosis, including its use in live animals, improving the detection of this disease even in epidemiological studies. Key words: bovine cysticercosis, Taenia saginata, Taenia crassiceps, immunoblotting, peptides. A dificuldade de se localizar cisticercos em bovinos com infeccao discreta torna o diagnostico tradicional da cisticercose bovina em matadouros um recurso de baixa sensibilidade, o que gera uma demanda de diagnostico por metodos alternativos como o immunoblot. Para tanto, neste trabalho, foram realizados ensaios de immunoblot a fim de analisar os peptideos responsaveis pela reacao do antigeno vesicular de Taenia crassiceps. Foram utilizadas 28 amostras de soro de bovinos comprovadamente negativos e 28 amostras coletadas de bovinos infectados experimentalmente com ovos de Taenia saginata. Os resultados dos ensaios de immunoblot com as amostras de soros-controle mencionadas indicaram que os peptideos de 4-6, 14 e 18kDa destacaram-se entre os demais, mostrando altas taxas de desempenho no diagnostico da cisticercose bovina e uma aparencia diferenciada, com area e largura maiores, ao contrario dos peptideos de media e alta massa molecular, que se apresentaram sob a forma de linha e com reacoes inespecificas. O immunoblot mostrou ter um potencial como uma alternativa de diagnostico da cisticercose bovina, incluindo sua aplicacao em animais vivos, como metodo auxiliar de diagnostico em estudos epidemiologicos da doenca. Palavras-chave: cisticercose bovina, Taenia saginata, Taenia crassiceps, immunoblot, peptideos.
ISSN:0103-8478