Associação dos polimorfismos nos genes da IL-4, IL-5, IL-13 e IL-10 e a asma infantil: uma revisão sistemática
Association of polymorphisms in IL-4, IL-5, IL-13 or IL-10 genes and childhood asthma: a systematic review
Iana R. F. Sales; Erica S. Fernandes; Décio M. Peixoto; Maria T. C. Muniz; Emanuel S. C. Sarinho; Valdênia M. O. Souza
Resumo
Objetivo: A reação inflamatória observada na asma é decorrente da ativação de linfócitos Th2, ação das citocinas IL-4, IL-5, IL-9 e IL-13 e produção de IgE. Estima-se que diferentes genes e seus polimorfismos influenciam o desenvolvimento da doença. O presente estudo apresenta os resultados de artigos, selecionados sistematicamente, sobre a associação de polimorfismos nos genes da IL-4, IL-5, IL-13 e IL-10 e o fenótipo de asma, gravidade da doença e atopia em crianças.
Fontes dos dados: Foi realizada uma pesquisa por artigos nos principais bancos científicos e foram selecionados 15 trabalhos, publicados entre 1999 e 2008.
Síntese dos dados: Em relação à associação entre os polimorfismos, em diferentes regiões do gene e o diagnóstico clínico de asma, foi verificado que para IL-4, 50% (4/8) dos artigos observaram associação significativa e para IL-13, 80% (4/5). Contudo, os estudos para os genes da IL-5 e IL-10 não encontraram associação positiva. Para a variável níveis de gravidade e/ou presença de atopia, 67% (4/6) e 100% (5/5) dos estudos encontraram associação nos genes da IL-4 e da IL-13, respectivamente. Para os genes da IL-5 e IL-10 foi observada associação significativa, porém, não é possível inferir conclusões, devido o pequeno número de artigos disponíveis.
Conclusões: Os resultados desta revisão sistemática ressaltam a participação de polimorfismos nos genes da IL-4 e IL-13 na indução de níveis de asma, gravidade dos sintomas e/ou atopia, além de enfatizar a necessidade de mais estudos sobre a participação do polimorfismo da IL-5 e IL-10 com os diferentes níveis de asma.
Palavras-chave
Abstract
Objective: The inflammatory reaction observed in asthma is due to the activation of Th2 lymphocytes, the action of cytokines IL-4, IL-5, IL-9 and IL-13 and the production of IgE. It is estimated that different genes and their polymorphisms influence the development of the disease. This study presents the results of systematically selected articles about the association of polymorphisms in genes of cytokines IL-4, IL-5, IL-13, IL-10 and asthma phenotype, the disease severity and atopy in children.
Data source: 15 scientific articles published between 1999 and 2008 were selected from major databases.
Data synthesis: Regarding the association between polymorphisms in different gene regions and the clinical diagnosis of asthma, 50% (4/8) of the articles about IL-4 stated the existence of a significant association and 80% (4/ 5) of those that studied IL-13 presented the same conclusion. However, in studies about genes of IL-5 and IL-10 no positive associations were found. For the variable levels of severity and/or the existence of atopy, 67% (4/6) and 100% (5/5) of the studies showed an association with genes of IL-4 and IL-13, respectively. Regarding genes of IL-5 and IL-10, a significant association was observed, but it was not possible to point out conclusions, due to the poor number of articles available.
Conclusions: The results of this systematic review highlight the role of polymorphisms in genes of IL-4 and IL-13 in the induction of asthma phenotypes, severity of symptoms and/or atopy. Also, this review emphasizes the need for further studies about the participation of polymorphisms of IL-5 and IL-10 in the different asthma phenotypes.
Keywords
References
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Submitted date:
12/20/2011
Accepted date:
06/04/2012
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