Impaired Bacillus Calmette-Guérin cellular immune response in HIV-exposed, uninfected infants.
AIDS
; 25(17): 2079-87, 2011 Nov 13.
Article
em En
| MEDLINE
| ID: mdl-21866040
OBJECTIVE: To evaluate cell-mediated immune response to Bacillus Calmette-Guérin (BCG) vaccination in uninfected, HIV-1-exposed infants, comparing it with unexposed children. DESIGN: It is designed as a cross-sectional study. METHODS: BCG-specific lymphoproliferation and T-cell subsets (CD4(+), CD8(+) and TCR γδ(+)) by flow cytometry and interleukin-10, interferon-γ (IFN-γ) and tumor necrosis factor-α (TNF-α) concentration by ELISA were analyzed in HIV-exposed and unexposed infants. Whole blood lymphocyte immunophenotyping and blood counts were performed in exposed children. Nonparametric tests were used (P < 0.05). RESULTS: Given the ontogeny of the immune system, exposed infants were separated into three groups according to age: exposed 1 (E1, aged 6.1-8.8 months), E2 (aged 9.1-17.1 months) and E3 (aged 18.1-26.3 months). Unexposed infants (UE group) and E1 were matched for age. Cell proliferation was not different among the three exposed groups, neither for BCG nor for phytohemagglutinin (PHA)-stimulated cultures. Furthermore, BCG-stimulated lymphoproliferation was reduced in the E1 group in comparison with the UE group. T-lymphocyte subpopulations also showed differences, with the youngest HIV-exposed groups (E1 and E2) showing a predominant proliferation of CD4(+) T cells in cultures with BCG, whereas E3 and UE groups had a robust γδ(+) T-cell expansion. There was lower IFN-γ concentration in the samples from E1 group in comparison with all of the other groups. The unexposed infants showed higher TNF-α concentration in cultures with BCG and PHA in comparison with E1 group. CONCLUSION: BCG-specific T-cell proliferation was reduced in HIV-exposed uninfected infants and IFN-γ concentration was lower in younger exposed infants, showing a delay in immune system maturation of HIV-exposed infants.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vacina BCG
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Linfócitos T CD4-Positivos
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HIV-1
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Soropositividade para HIV
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Interferon gama
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Fator de Necrose Tumoral alfa
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Linfócitos T CD8-Positivos
Tipo de estudo:
Observational_studies
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Prevalence_studies
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Risk_factors_studies
Limite:
Child, preschool
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Female
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Humans
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Infant
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Male
Idioma:
En
Revista:
AIDS
Assunto da revista:
SINDROME DA IMUNODEFICIENCIA ADQUIRIDA (AIDS)
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido