Protective role of mouse MBL-C on intestinal mucosa during Shigella flexneri invasion.
Int Immunol
; 21(10): 1125-34, 2009 Oct.
Article
em En
| MEDLINE
| ID: mdl-19684159
ABSTRACT
Mannan-binding lectin (MBL) is a C-type serum lectin, which is believed to play an important role in the innate immunity against a variety of pathogens. MBL can bind to sugar determinants of a wide variety of microorganisms, neutralize them and inhibit infection by complement activation through the lectin pathway and opsonization by collectin receptors. Given that small intestine is a predominant site of extrahepatic expression of MBL, here we addressed the question whether MBL is involved in mucosal innate immunity. The carbohydrate recognition domain (CRD) genes of mouse MBL-C (mMBL-C) were cloned and expressed in Escherichia coli. Recombinant mMBL-C-CRD binds to Shigella flexneri 2a in a calcium-dependent manner and that interaction could be blocked by the anti-mMBL-C-CRD antibody. mMBL-C-CRD protein could inhibit the adhesion of S. flexneri 2a to intestinal mucosa, while administration of anti-mMBL-C-CRD antibody caused an increased level of bacteria adhesion in vitro. Administration of recombinant mMBL-C-CRD protein reduced the secretion of IL-6 and monocyte chemoattractant protein 1 from primary intestinal epithelial cells stimulated with S. flexneri 2a. Furthermore, neutralization of MBL activity by anti-MBL-C-CRD resulted in a significant increase in the number of S. flexneri 2a that colonized the intestines of BALB/c mice and attenuated the severity of inflammation seen in the areas of bacterial invasion. These findings suggest that mMBL-C may protect host intestinal mucosa by directly binding to the bacteria.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Shigella flexneri
/
Lectina de Ligação a Manose
/
Disenteria Bacilar
/
Mucosa Intestinal
/
Intestino Delgado
Limite:
Animals
Idioma:
En
Revista:
Int Immunol
Assunto da revista:
ALERGIA E IMUNOLOGIA
Ano de publicação:
2009
Tipo de documento:
Article