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Master's Dissertation
DOI
10.11606/D.10.2011.tde-16032012-092228
Document
Author
Full name
Marina de Oliveira Cesar
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Matushima, Eliana Reiko (President)
Soares, Rodrigo Martins
Souza, Silvio Luís Pereira de
Title in Portuguese
Sarcocystis sp eliminados por Didelphis aurita e Didelphis albiventris (Gambás) de vida livre no Estado de São Paulo: infecção experimental em periquitos australianos (Melopsittacus undulatus) e camundongos Balb/c nude
Keywords in Portuguese
Didelphis sp
S. falcatula
S. neurona
Sarcocystis sp
Patologia
Abstract in Portuguese
Didelphis virginiana (gambá) é hospedeiro definitivo do Sarcocystis falcatula, Sarcocystis neurona e Sarcocystis speeri. Os esporocistos de S. neurona, S. falcatula e S. speeri são similares morfologicamente, mas podem ser distinguidos por sua patogenicidade e infectividade em aves e camundongos imunodeficientes e métodos moleculares. Porém, há uma considerável controvérsia a respeito da identificação das espécies de Sarcocystis de gambás. A heterogeneidade genética das espécies de Sarcocystis dificulta a identificação definitiva destes parasitos. Utilizou-se D. aurita e D. albiventris (gambás) mortos provenientes de Zoológicos e Centros de Triagens do Estado de São Paulo. Após usar o método de centrífugo-flutuação em solução de sacarose, purificou-se 19 (31,25%) das 25 amostras positivas em duplicatas para realização de PCR e ensaios biológicos utilizando periquitos australianos (Melopsittacus undulatus) como modelo biológico do S. falcatula e camundongos Balb/c nude como modelo experimental para S. neurona. As amostras de esporocistos foram identificadas por PCR e sequenciamento de nucleotídeos de fragmentos codificadores de gene de proteína de superfície 2 (SAG-2) como S. falcatula. Os resultados das inoculações experimentais em periquitos australianos também demonstraram que as amostras continham esporocistos de Sarcocystis falcatula de alta patogenicidade e infectividade. Quinze animais inoculados vieram a óbito 10 dias pós-inoculação. As análises histopatológicas revelaram lesões severas principalmente em pulmão e fígado. Entretanto, não foram encontradas lesões em camundongos Balb/c nude inoculados com duas dessas amostras de esporocistos. Este trabalho demonstrou a importância desta enfermidade no Estado de São Paulo.
Title in English
Sarcocystis sp eliminated by free-ranging Didelphis aurita and Didelphis albiventris (opossum) in São Paulo: experimental infection in budgerigars (Melopsittacus undulatus) and Balb/c nude mice
Keywords in English
Didelphis sp
S. falcatula
S.neurona
Sarcocystis sp
Pathology
Abstract in English
Didelphis virginiana (opossum of North America) is a definitive host of Sarcocystis falcatula, Sarcocystis neurona and Sarcocystis speeri. Sporocysts of S. neurona, S. falcatula and S. speeri are morphologically similar but can be distinguished by its pathogenicity and infectivity in immunodeficient mice and birds and molecular methods. However, there is considerable controversy regarding the identification of Sarcocystis species from opossums. The genetic heterogeneity of species of Sarcocystis hinders definitive identification of these parasites. We used dead D. aurita and D. albiventris (opossum) from Zoos and Trials Centers of São Paulo. After using the centrifugal flotation in sucrose solution, nineteen (31.25%) of 25 positive samples were purified in duplicate for PCR and biological assays using budgerigars (Melopsittacus undulatus) as a biological model of S. falcatula and Balb/c nude as a model for S. neurona. Samples of sporocysts were identified by PCR and sequencing of gene fragments encoding surface protein 2 (SAG-2) as S. falcatula. The results of experimental inoculations in budgerigars also showed that the samples contained high pathogenic and infective Sarcocystis falcatula sporocists. Fifteen infected animals died 10 days post-inoculation. The histopathological analysis showed severe lesions mainly in lung and liver. However, no lesions were found in Balb/c nude inoculated with two samples of sporocysts. This study demonstrated the importance of this disease in the state of São Paulo.
 
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Publishing Date
2012-09-27
 
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