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Previous issue date: 2013-12-13 / INTRODUCTION: Studies have shown that LAIV is more effective than TIV for prevention of influenza infection in young children, but the underlying mechanisms associated with protection are still not well defined. OBJECTIVES: To assess differences in cellular immunity and gene expression profiles in children after immunization with LAIV or TIV. METHODS: Peripheral blood of previously healthy children was collected pre and postvaccination and analyzed for B cells measurement and antibodies production. Microarray analyses were applied to assess the gene expression profiles. RESULTS: LAIV vaccinees showed number of na?ve, memory and transitional B cells increased on day 1 compared to baseline (p<0.05). TIV vaccinees showed the number of plasmablasts increased on day 7 post-vaccination (p≤0.01). In addition, the titers for the three strains of the vaccine (H1N1, H3N2 and B) were significantly elevated on the TIV group when compared with the LAIV group. Regarding the transcriptional profiles presented, both vaccines induced interferon signaling, but in different time points, TIV 1 day postvaccination and LAIV 7 days post-vaccination, the last only in children younger than 5 years old. CONCLUSIONS: These results indicate that LAIV and TIV induced different immune responses in peripheral blood of vaccinated children and that both vaccines induce interferon signaling post-vaccination. / INTRODU??O: Estudos t?m demonstrado que a vacina contra os v?rus influenza LAIV ? mais eficiente que a formula??o TIV para a preven??o de infec??o em crian?as, por?m os mecanismos envolvidos ainda n?o est?o bem definidos. OBJETIVOS: Acessar as diferen?as na imunidade celular humoral e de express?o de perfis g?nicos em crian?as imunizadas com LAIV ou TIV. M?TODOS: Sangue perif?rico de crian?as previamente h?gidas foi coletado pr? e p?svacina??o e analisado para mensura??o de c?lulas B e para titula??o de anticorpos. An?lise pela t?cnica de microarranjos foi empregada para avalia??o dos perfis de express?o g?nica. RESULTADOS: Vacina??o com LAIV induziu aumento do n?mero absoluto de c?lulas B na?ve, de mem?ria e transicionais no ap?s 30 dias comparado aos valores medidos antes da vacina??o (p<0.05). Vacina??o com TIV, no entanto, induziu aumento de plasmoblastos no dia 7 p?s-vacina??o (p<0.01). Os t?tulos de anticorpos para os tr?s ant?genos da vacina (H1N1, H3N2 e B) encontraram-se significativamente elevados no grupo vacinado com TIV quando comparado ao grupo que recebeu LAIV. Ambos os grupos vacinados induziram sinaliza??o de genes relacionados ao interferon, por?m em diferentes momentos: TIV induziu-os 1 dia p?s-vacina??o, enquanto LAIV 7 dias p?s-vacina??o, especialmente em crian?as com menos de cinco anos de idade. CONCLUS?ES: Esses resultados sugerem que as vacinas LAIV e TIV induzem resposta celular imune diferente em crian?as e que ambas induzem sinaliza??o de interferon p?s-vacina??o.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1756 |
| Date | 13 December 2013 |
| Creators | Cao, Raquel Giacomelli |
| Contributors | Stein, Renato Tetelbom |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Medicina e Ci?ncias da Sa?de, PUCRS, BR, Faculdade de Medicina |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 7620745074616285884, 500, 600, -8624664729441623247 |
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