Comparação da resposta imune induzida pela vacinação de bezerros Curraleiros e Nelores com Mycobacterium bovis-BCG.
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2010-03-05
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Universidade Federal de Goiás
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Curraleiro breed has adapted to the extensive breeding in the Brazilian savanna. These rustic animals seem to be more resistant to regional endemic diseases. Resistance to infection is directly correlated to the host immune response. In order to check if differences might exist among Curraleiro s immune response and the response of other exotic cattle breeds in the savannah region, Curraleiro and Nellore calves were assessed before and after immunization with BCG vaccine. Twelve young calves (around six months of age) were used. After quarantine, the animals were divided into four groups: Control (three calves from each breed) and Vaccinated (three calves from each breed). The mononuclear cells were obtained from peripheral blood at time zero (before vaccination), one, seven and, thirty days after the vaccination. The cells were submitted to phagocytosis test, NO production and analysis by flow cytometry of the following populations: NK, T, CD4 e CD8 as well as for their IFN-production. The intradermic test was realized in all calves forty-five days after vaccination. Macrophages from Curraleiro breed showed superior phagocytosis rates (7.650±3.661) than Nellore macrophages (2.970±1.282). Before BCG vaccination, Curraleiro calves had higher numbers of CD4+ cells (2049±402.3), CD8+ cells (1207±166), TWC1+ cells (1443/mL±384,6) in peripheral blood, than Nellore calves (CD4: 1240/mL ±337; CD8: 772.1/mL ±278.3; TWC1+: 745.5/mL ±67.22). The CD4 and CD8 IFN- positive cells were also higher in Curraleiro animals. Vaccination was able to generate specific immune response on both breeds. Thirty days after vaccination, Curraleiro animals presented greater levels of CD4IFN-positive (202.8±44.96) cells than Nellore ones (143.7±40.43). The findings of this study support the Curraleiro resistance profile in comparison to Nellore breed, due to a better capacity to induce specific immune response to M. bovis-BCG vaccine.
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MAGGIOLI, Mayara Fernanda. Comparison of immune response induced by vaccination of calves Curraleiro and Nellore with Mycobacterium bovis-BCG.. 2010. 86 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2010.