Reduced Expression of HLA-DR on Monocytes During Severe Respiratory Syncytial Virus Infections.
Pediatr Infect Dis J
; 35(3): e89-96, 2016 Mar.
Article
em En
| MEDLINE
| ID: mdl-26658377
ABSTRACT
BACKGROUND:
Respiratory syncytial virus (RSV) is a common cause of bronchiolitis in infants with a wide spectrum of disease severity. Besides environmental and genetic factors, it is thought that the innate immune system plays a pivotal role. The aim of this study was to investigate the expression of immune receptors on monocytes and the in vitro responsiveness from infants with severe RSV infections.METHODS:
Peripheral blood mononuclear cells (PBMCs) from infants with RSV infections were isolated. Classical, intermediate and nonclassical monocytes were immunophenotyped for the expression of CD14, CD16, human leukocyte antigen (HLA)-ABC and HLA-DR. PBMCs were stimulated with lipopolysaccharide to determine the secretion of tumor necrosis factor and interleukin (IL)-10 with enzyme-linked immunosorbent assay.RESULTS:
During RSV infection, intermediate monocytes are increased in the peripheral blood, whereas classical and nonclassical monocytes are reduced. The expression of CD14 and HLA-ABC is increased on monocytes, whereas the expression of HLA-DR is suppressed. Low HLA-DR expression is correlated with increased disease severity. PBMCs from infants with severe RSV infections show an impaired IL-10 response in vitro.CONCLUSIONS:
Phenotyping subpopulations of monocytes combined with in vitro responsiveness reveals significant differences between nonsevere and severe RSV infections. Reduced HLA-DR expression and impaired IL-10 production in vitro during severe RSV infections indicate that an imbalanced innate immune response may play an important role in disease severity.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Monócitos
/
Antígenos HLA-DR
/
Expressão Gênica
/
Vírus Sincicial Respiratório Humano
/
Infecções por Vírus Respiratório Sincicial
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Incidence_studies
/
Observational_studies
/
Risk_factors_studies
Limite:
Female
/
Humans
/
Infant
/
Male
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article