Clearance of Pneumococcal Colonization in Infants Is Delayed through Altered Macrophage Trafficking.
PLoS Pathog
; 11(6): e1005004, 2015 Jun.
Article
em En
| MEDLINE
| ID: mdl-26107875
ABSTRACT
Infections are a common cause of infant mortality worldwide, especially due to Streptococcus pneumoniae. Colonization is the prerequisite to invasive pneumococcal disease, and is particularly frequent and prolonged in children, though the mechanisms underlying this susceptibility are unknown. We find that infant mice exhibit prolonged pneumococcal carriage, and are delayed in recruiting macrophages, the effector cells of clearance, into the nasopharyngeal lumen. This lack of macrophage recruitment is paralleled by a failure to upregulate chemokine (C-C) motif ligand 2 (Ccl2 or Mcp-1), a macrophage chemoattractant that is required in adult mice to promote clearance. Baseline expression of Ccl2 and the related chemokine Ccl7 is higher in the infant compared to the adult upper respiratory tract, and this effect requires the infant microbiota. These results demonstrate that signals governing macrophage recruitment are altered at baseline in infant mice, which prevents the development of appropriate innate cell infiltration in response to pneumococcal colonization, delaying clearance of pneumococcal carriage.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Infecções Pneumocócicas
/
Streptococcus pneumoniae
/
Movimento Celular
/
Vacinas Pneumocócicas
/
Macrófagos
Limite:
Animals
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article