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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

Produção e avaliação de uma vacina de subunidade recombinante contra a pneumonia enzoótica suína / Production and Evaluation of Recombinant Subunit Vaccine Against Swine Enzootic Pneumonia

Conceição, Fabrício Rochedo 23 May 2005 (has links)
Made available in DSpace on 2014-08-20T13:32:50Z (GMT). No. of bitstreams: 1 tese_fabricio_rochedo_conceicao.pdf: 327058 bytes, checksum: 658bb226c85f41df4bb5329fd71ab1d7 (MD5) Previous issue date: 2005-05-23 / SUMMARY CONCEIÇÃO, FABRICIO ROCHEDO, Universidade Federal de Pelotas, may 2005. Production and Evaluation of Recombinant Subunit Vaccine Against Swine Enzootic Pneumonia. Advisor: Odir Antônio Dellagostin. Co-Advisor: Swine Enzootic Pneumonia (SEP), caused by bacterium Mycoplasma hyopneumoniae, is the most important respiratory disease in swine breeding. The commonly used vaccines to control this disease consist of bacterins, whose production cost is high and the efficiency is limited. The objective of this study was to develop and to evaluate a new alternative for controlling SEP, based on a recombinant subunit vaccine (rLTBR1) containing the R1 region of P97 adhesin of Mycoplasma hyopneumoniae (R1) fused to the B subunit of the heat-labile enterotoxin of Escherichia coli (LTB). rLTBR1 formed functional oligomers that presented high affinity to GM1 ganglioside. Mice inoculated with rLTBR1 (IN or IM) produced high levels of anti-R1 systemic and mucosal (sIgA) antibodies, which recognized the native P97. On the other hand, mice inoculated with the commercial bacterin did not produce anti-R1 antibodies. The administration route influenced the modulation of the immune response by LTB, showing that IM rLTBR1 induced Th2-biased immune responses and IN rLTBR1 induced Th1-biased immune responses. IN rLTBR1 also induced IFN-γ secretion by lymphocytes. The rLTB showed to be a powerful mucosal adjuvant, stimulating the production of anti-R1 IgA in trachea and bronchi from mice inoculated with rLTBR1 by parenteral route (IM). rLTBR1 may constitute a new strategy for preventing infection by Mycoplasma hyopneumoniae and may have potential for developing vaccines against other infectious diseases as well. Now a day, the efficacy of this vaccine is being evaluated in specific pathogen free swine. / A Pneumonia Enzoótica Suína (PES), causada pela bactéria Mycoplasma hyopneumoniae, é a doença respiratória mais importante na suinocultura. As vacinas convencionais utilizadas para controlar esta doença consistem de bacterinas, que apresentam custo de produção elevado e eficiência limitada. O objetivo deste estudo foi desenvolver e avaliar uma nova alternativa para controlar a PES, baseada em uma vacina de subunidade recombinante (rLTBR1) composta pela região R1 da adesina P97 de Mycoplasma hyopneumoniae (R1) fusionada a subunidade B da enterotoxina termolábil de Escherichia coli (LTB). rLTBR1 formou oligômeros funcionais que apresentaram alta afinidade pelo gangliosídeo GM1. Camundongos inoculados com rLTBR1 (I.M. ou I.N.) produziram altos níveis de anticorpos sistêmicos e de mucosa anti-R1, os quais reconheceram a P97 nativa. Por outro lado, os camundongos inoculados com a bacterina comercial não produziram anticorpos anti-R1. A rota de administração influenciou a modulação da resposta imune pela LTB, demonstrando que a rLTBR1 I.M. induziu uma resposta do tipo Th2 e a rLTBR1 I.N. do tipo Th1. rLTBR1 I.N. também induziu a secreção de IFN-γ por linfócitos. A rLTB demonstrou ser um potente adjuvante da imunidade de mucosa, estimulando a produção de IgA anti-R1 na traquéia e brônquios de camundongos inoculados com rLTBR1 através de rota parenteral (I.M.). A rLTBR1 pode constituir uma nova ferramenta para prevenir a infecção por M. hyopneumoniae, sendo que a estratégia utilizada pode ser aplicada no desenvolvimento de vacinas contra outras doenças infecciosas. Atualmente, a eficácia da rLTBR1 está sendo avaliada em suínos livres de patógenos específicos. rLTBR1; P97; LTB.

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