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Previous issue date: 2013-08-05 / Introduction : almost all infants present infection by respiratory syncytial virus (RSV) up to 2 years of age. However, the severity of acute viral bronchiolitis (AVB) can vary significantly. This variability may be caused by genetic and immunological factors. Previous studies have shown that RSV-infected airway contains high levels of interleukin 8 (IL-8). The knowledge of genetic polymorphisms associated with severe AVB may have clinical relevance, identifying patients with high-risk for severe AVB. Methods : We included infants admitted to the pediatric emergency of Hospital Sao Lucas (HSL) da PUCRS with AVB, aged less than 12 months, in the period between september 2009 to september 2011; and infants of the same age who did not have had AVB, recruited from the primary care center Bom Jesus. Samples were collected from capillary blood. DNA was extracted for genotyping of two polymorphisms (SNPs rs2227543 and rs2227307) in the IL-8 gene. Results : In the final genetic association sample, we included 115 cases and 64 controls. There was no significant deviation from Hardy-Weinberg equilibrium. The SNP rs2227543 showed significant protection for AVB, with lower frequency of homozygous TT patients in the control group (OR 0.25: CI 0.10 to 0.65). However, rs2227307 showed no association with AVB. Conclusion : This finding, together with the analysis of previous studies, suggests that the IL-8 polymorphism rs2227543 is associated with protection of the AVB and directly influences the severity of AVB in these infants / Introdu??o : At? os 2 anos de idade, praticamente, todos os lactentes apresentam infec??o por v?rus sincicial respirat?rio (VSR). Entretanto, a gravidade da bronquiolite viral aguda (BVA) pode variar significativamente. Essa grande varia??o pode ser causada por fatores gen?ticos e imunol?gicos. Estudos pr?vios indicam que vias a?reas infectadas por VSR cont?m n?veis elevados de interleucina-8 (IL-8). O conhecimento de polimorfismos gen?ticos associados ? BVA grave pode ter grande relev?ncia cl?nica, identificando pacientes de alto risco. M?todos : Foram inclu?dos lactentes internados na emerg?ncia pedi?trica do Hospital S?o Lucas (HSL) da PUCRS com BVA, idade menor de 12 meses, no per?odo entre setembro de 2009 a setembro de 2011, e lactentes da mesma faixa et?ria que n?o apresentaram BVA, recrutados junto ao Centro de Sa?de Bom Jesus (CSBJ). Foram coletadas amostras de sangue capilar. Desse material, foi extra?do DNA utilizado para genotipagem de 2 polimorfismos (SNPs rs2227543 e rs2227307) do gene IL-8. Resultados : Fazem parte da an?lise final do estudo de associa??o gen?tica 115 casos e 64 controles. N?o foi observado nenhum desvio significativo pelo m?todo do equil?brio de Hardy-Weinberg. O SNP rs2227543 mostrou uma prote??o significativa para BVA, apresentando frequ?ncia menor de homozigotos TT em pacientes do grupo controle (OR 0,25: IC 0,10 0,65). No entanto, a varia??o gen?tica rs2227307 n?o demonstrou associa??o com a BVA. Conclus?o : Esse achado, em conjunto com a an?lise de estudos pr?vios, sugere que o polimorfismo rs2227543 de IL-8 est? associado ? prote??o da BVA e influencia diretamente a gravidade da BVA nessas crian?as.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1423 |
| Date | 05 August 2013 |
| Creators | Leit?o, Lidiane Alves de Azeredo |
| Contributors | Pinto, Leonardo Ara?jo |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Medicina/Pediatria e Sa?de da Crian?a, 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/masterThesis |
| 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 | 3098206005268432148, 500, 600, -8624664729441623247 |
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