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Year 2013 - Volume 33, Number 10
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Induction of immune response in broiler chickens immunized with recombinant FliC and challenged by Salmonella Typhimurium, 33(10):1215-1221
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ABSTRACT.- Baptista A.A.S., Donato T.C., Souza, E.E., Gonçalves G.A.M., Garcia, K.C.O.D., Rodrigues J.C.Z., Sequeira J.L. & Andreatti Filho R.L. 2013. Induction of immune response in broiler chickens immunized with recombinant FliC and challenged by Salmonella Typhimurium. Pesquisa Veterinária Brasileira 33(10):1215-1221. Departamento de Clínica Veterinária, Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista Júlio de Mesquita Filho, Unesp-Botucatu, Distrito de Rubião Júnior s/n, Botucatu, SP 18608-970, Brazil. E-mail: angelita_sampaio@yahoo.com.br
The study examined (1) the immune response in broiler chickens after oral immunization with recombinant flagellin (rFliC) from Salmonella Typhimurium conjugated with sodium alginate microparticles, and the immune response enhancement in association with recombinant cholera toxin B subunit protein (rCTB) and pool of Lactobacillus spp. (PL). The immune responses were evaluated by dosage of IgY serum and IgA from intestinal fluid and immunostaining of CD8+ T lymphocytes in the cecum. The immunized animals were challenged with Salmonella Typhimurium (ST) 21 days after treatment. In all immunized groups, a significant increase (p<0.05) was observed in IgA levels (mg/mL), especially three weeks after immunization. The serum IgY levels (mg/mL) were little affected by the treatments and differed significantly among groups only in the second post-immunization week (p<0.05). After the challenge, the number of CD8+ T cells differed significantly between the treatments and negative control. Retrieval of Salmonella Typhimurium was not detected at 48 hours after the challenge in T2 (rFliC+rCTb), T3 (rFliC+PL) and T4 (rFliC+rCTB PL). The rFliC administered orally with or without rCTB and Lactobacillus spp. produces significant induction of humoral immune response, and the immunized chickens were more effective in eliminating Salmonella after challenge. |
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