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| Oliveira,S.C.; Rosinha,G.M.S.; de-Brito,C.F.A.; Fonseca,C.T.; Afonso,R.R.; Costa,M.C.M.S.; Goes,A.M.; Rech,E.L.; Azevedo,V.. |
| Gene vaccines represent a new and promising approach to control infectious diseases, inducing a protective immune response in the appropriate host. Several routes and methods of genetic immunization have been shown to induce antibody production as well as T helper (Th) cell and cytotoxic T lymphocyte activation. However, few studies have compared the nature of the immune responses generated by different gene vaccination delivery systems. In the present study we reviewed some aspects of immunity induced by gene immunization and compared the immune responses produced by intramuscular (im) DNA injection to gene gun-mediated DNA transfer into the skin of BALB/c mice. Using a reporter gene coding for ß-galactosidase, we have demonstrated that im injection... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gene vaccination; Naked DNA; Gene gun; Cytokines; Immune response. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000200009 |
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| Azevedo,V.; Levitus,G.; Miyoshi,A.; Cândido,A.L.; Goes,A.M.; Oliveira,S.C.. |
| DNA-based immunization has initiated a new era of vaccine research. One of the main goals of gene vaccine development is the control of the levels of expression in vivo for efficient immunization. Modifying the vector to modulate expression or immunogenicity is of critical importance for the improvement of DNA vaccines. The most frequently used vectors for genetic immunization are plasmids. In this article, we review some of the main elements relevant to their design such as strong promoter/enhancer region, introns, genes encoding antigens of interest from the pathogen (how to choose and modify them), polyadenylation termination sequence, origin of replication for plasmid production in Escherichia coli, antibiotic resistance gene as selectable marker,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic immunization; DNA plasmid; Enhancer/promoter region; Immunostimulatory sequences (ISS); Antigens; Immune response. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000200002 |
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| Freitas,D.A.; Leclerc,S.; Miyoshi,A.; Oliveira,S.C.; Sommer,P.S.M.; Rodrigues,L.; Correa Junior,A.; Gautier,M.; Langella,P.; Azevedo,V.A.; Le Loir,Y.. |
| Lactococcus lactis, the model lactic acid bacterium, is a good candidate for heterologous protein production in both foodstuffs and the digestive tract. We attempted to produce Streptomyces tendae antifungal protein 1 (Afp1) in L. lactis with the objective of constructing a strain able to limit fungal growth. Since Afp1 activity requires disulfide bond (DSB) formation and since intracellular redox conditions are reportedly unfavorable for DSB formation in prokaryotes, Afp1 was produced as a secreted form. An inducible expression-secretion system was used to drive Afp1 secretion by L. lactis; Afp1 was fused or not with LEISSTCDA, a synthetic propeptide (LEISS) that has been described to be a secretion enhancer. Production of Afp1 alone was not achieved, but... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactococcus lactis; Antifungal protein; Secretion; Streptomyces tendae antifungal protein 1. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001100004 |
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| 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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| Oliveira,S.C.; Harms,J.S.; Rech,E.L.; Rodarte,R.S.; Bocca,A.L.; Goes,A.M.; Splitter,G.A.. |
| Cellular immune responses are a critical part of the host's defense against intracellular bacterial infections. Immunity to Brucella abortus crucially depends on antigen-specific T cell-mediated activation of macrophages, which are the major effectors of cell-mediated killing of this organism. T lymphocytes that proliferate in response to B. abortus were characterized for phenotype and cytokine activity. Human, murine, and bovine T lymphocytes exhibited a type 1 cytokine profile, suggesting an analogous immune response in these different hosts. In vivo protection afforded by a particular cell type is dependent on the antigen presented and the mechanism of antigen presentation. Studies using MHC class I and class II knockout mice infected with B. abortus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: T cell subsets; Brucella abortus; Knockout mice; Cytokines; Intracellular pathogens; Genetic immunization. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000100010 |
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