Decreased expression of cardiac troponin C is associated with cardiac lesions in Amorimia exotropica poisoned cattle

The plants which cause sudden death of cattle in Brazil occupy a leading position for losses in the cattle industry. Amorimia exotropica is one of the plants pertaining to this group. Diagnostic findings in these cases may be inconclusive; further knowledge is necessary. This paper identifies cardia...

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Published inPesquisa Veterinária Brasileira Vol. 32; no. 10; pp. 1005 - 1008
Main Authors Pavarini, Saulo Petinatti, Bandinelli, Marcele Bettim, Juffo, Gregory Duarte, Souza, Suyene Oltramari de, Driemeier, David, Cruz, Cláudio Estêvão Farias da
Format Journal Article
LanguageEnglish
Published Colégio Brasileiro de Patologia Animal (CBPA) 01.10.2012
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Summary:The plants which cause sudden death of cattle in Brazil occupy a leading position for losses in the cattle industry. Amorimia exotropica is one of the plants pertaining to this group. Diagnostic findings in these cases may be inconclusive; further knowledge is necessary. This paper identifies cardiac lesions through anti-cardiac troponin C (cTnC) immunehistochemistry performed in tissues from cattle poisoned after consumption of A.exotropica in southern Brazil. Heart fragments from nine A. exotropica-poisoned cattle were studied immunohistochemically using anti-human cTnC as the primary antibody. In the hearts from all of the poisoned cattle, there was a sharp decrease in the cTnC expression level in the cytoplasm of groups of cardiomyocytes. A significant decrease in anti-cTnC immunoreactivity occurred particularly in degenerated or necrotic cardiomyocytes. Occasional groups of cells showed complete loss of immunolabeling. In the remaining intact cardiomyocytes from poisoned cattle and in cardiomyocytes from six cattle that died from other causes there was intense cytoplasmic staining. No Brasil, plantas cujo consumo determina morte súbita de bovinos estão entre as principais causas de perdas na pecuária. Esse trabalho identifica lesões cardíacas através de imuno-histoquímica antitroponina cardíaca C (TncC), desenvolvida em tecidos de bovinos intoxicados após consumo de Amorimia exotropica, no sul do Brasil. Fragmentos cardíacos de nove bovinos intoxicados, naturalmente, por Amorimia exotropica foram examinados por imuno-histoquímica anti-TncC, como anticorpo primário. Nos corações de todos os bovinos intoxicados pela planta, havia pronunciada diminuição dos níveis de expressão de TncC no citoplasma de grupos de cardiomiócitos. Diminuição significativa na imunorreatividade anti-TncC ocorreu, particularmente, em cardiomiócitos degenerados ou necróticos. Grupos ocasionais de células mostraram completa perda de imunomarcação. Em cardiomiócitos remanescentes e intactos de bovinos intoxicados e em cardiomiócitos de seis bovinos que morreram por outras causas, observou-se intensa coloração citoplasmática.
ISSN:0100-736X
1678-5150
0100-736X
DOI:10.1590/S0100-736X2012001000010