https://repositorio.ufba.br/handle/ri/11948
Tipo: | Artigo de Periódico |
Título: | Environmental conditions, immunologic phenotypes, atopy, and asthma: New evidence of how the hygiene hypothesis operates in Latin America |
Título(s) alternativo(s): | Journal of Allergy and Clinical Immunology |
Autor(es): | Figueiredo, Camila Alexandrina Amorim, Leila Denise Alves Ferreira Alcântara-Neves, Neuza Maria Matos, Sheila Maria Alvim de Cooper, Philip J. Rodrigues, Laura C. Barreto, Mauricio Lima |
Autor(es): | Figueiredo, Camila Alexandrina Amorim, Leila Denise Alves Ferreira Alcântara-Neves, Neuza Maria Matos, Sheila Maria Alvim de Cooper, Philip J. Rodrigues, Laura C. Barreto, Mauricio Lima |
Abstract: | Background It has been proposed that improved hygiene and reduced experience of infections in childhood influences the development of allergic diseases. The mechanisms by which the hygiene operates are not well established but are underpinned by two apparently incompatible immunologic paradigms, the balance of TH1 versus TH2 cytokines and IL-10–mediated regulation of TH2 cytokines. Objective This study defined immunologic phenotypes with the use of latent class analysis and investigated their associations with environmental factors, markers of allergy and asthma, in a Latin American population. Methods We studied 1127 children living in urban Brazil. Data on wheeze and environmental exposures were collected with standardized questionnaires. Atopy was measured by specific IgE in serum and skin prick test reactivity to aeroallergens. Cytokines were measured in culture after the stimulation of peripheral blood leukocytes with mitogen. Infections with pathogens were assessed by serology and stool examinations. Children were classified as having high or low burden of infection. Latent class analysis was used to identify immune phenotypes on the basis of cytokine production. Logistic regression was used to evaluate the adjusted effects of environment and burden of infection on the immunologic phenotypes and the effect of the phenotypes on atopy and asthma. Results Three phenotypes were identified, labeled underresponsive, intermediate, and responsive. Children of more educated mothers, living in improved environmental conditions, and with a low burden of infection were significantly more likely to have the responsive phenotype. The responsive phenotype was significantly associated with an increased prevalence of atopy but not asthma. Conclusion Our findings contribute to a better understanding of the immune mechanisms by which the hygiene hypothesis operates in urban Latin America. |
Palavras-chave: | LCA environment infections immune phenotypes children hygiene hypothesis SCAALA |
Editora / Evento / Instituição: | Journal of Allergy and Clinical Immunology |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/11948 |
Data do documento: | 2013 |
Aparece nas coleções: | Artigo Publicado em Periódico Estrangeiro (ISC) |
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