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Indirect effects of oral tolerance to ovalbumin interfere with the immune responses triggered by Schistosoma mansoni eggs BJMBR
Carvalho,C.R.; Lenzi,H.L.; Correa-Oliveira,R.; Vaz,N.M..
The objective of the present study was to investigate whether the injection of a tolerated protein (indirect effects) affects the formation of granulomas around Schistosoma mansoni eggs trapped in the lungs after intravenous (iv) injection into normal (noninfected) C57BL/6 mice (6 animals per group). To induce oral tolerance to chicken egg ovalbumin a 1/5 dilution of egg white in water was offered ad libitum in a drinking bottle for 3 days. Control mice received water. After 7 days, control and experimental animals were injected iv with 2,000 S. mansoni eggs through a tail vein. In some mice of both groups the iv injection of eggs was immediately followed by intraperitoneal (ip) immunization with 10 µg of dinitrophenylated conjugates of ovalbumin (DNP-Ova)...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Oral tolerance; Ovalbumin; Granuloma; Schistosoma mansoni.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000012
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Sm14 gene expression in different stages of the Schistosoma mansoni life cycle and immunolocalization of the Sm14 protein within the adult worm BJMBR
Brito,C.F.A.; Oliveira,G.C.; Oliveira,S.C.; Street,M.; Riengrojpitak,S.; Wilson,R.A.; Simpson,A.J.G.; Correa-Oliveira,R..
Sm14 is a 14-kDa vaccine candidate antigen from Schistosoma mansoni that seems to be involved in cytoplasmic trafficking of fatty acids. Although schistosomes have a high requirement for lipids, they are not able to synthesize fatty acids and sterols de novo. Thus, they must acquire host lipids. In order to determine whether Sm14 is present in different stages of the life cycle of the parasite, we performed RT-PCR. Sm14 mRNA was identified in all stages of the life cycle studied, mainly schistosomulum, adult worm and egg. Additionally, we used a rabbit anti-Sm14 polyclonal antibody in an indirect immunofluorescence assay to localize Sm14 in adult worm sections. The basal lamella of the tegument and the gut epithelium were strongly labeled. These tissues...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Sm14; Fatty acid-binding protein; FABP; Immunolocalization; RT-PCR.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000300014
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The role of IFN-gamma and IL-4 in gastric mucosa inflammation associated with Helicobacter heilmannii type 1 infection BJMBR
Cinque,S.M.S.; Rocha,G.A.; Correa-Oliveira,R.; Soares,T.F.; Moura,S.B.; Rocha,A.M.C.; Nogueira,A.M.M.F.; Cabral,M.M.D.A.; Vieira,L.Q.; Martins-Filho,O.A.; Queiroz,D.M.M..
Although Helicobacter heilmannii infection is less common than H. pylori infection in humans, it is considered to be of medical importance because of its association with gastritis, gastric ulcer, carcinoma, and mucosa-associated lymphoid tissue lymphoma of the stomach. However, there have been no studies evaluating the role of the Th cell response in H. heilmannii gastric infection. We evaluated the participation of pro-inflammatory and anti-inflammatory cytokines, IFN-gamma and IL-4, in H. heilmannii gastric infection in genetically IFN-gamma- or IL-4-deficient mice. The serum IFN-gamma and IL-4 concentrations were determined by ELISA. The gastric polymorphonuclear infiltrate was higher (P = 0.007) in H. heilmannii-positive than in H. heilmannii-negative...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helicobacter heilmannii; Gastric mucosa inflammation; IFN-gamma-/- mice; IL-4-/- mice.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000200012
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