Pseudomonas aeruginosa adhesion to normal and injured respiratory mucosa
Mem. Inst. Oswaldo Cruz
; 87(supl.5): 61-8, 1992.
Article
em En
| LILACS
| ID: lil-128421
Biblioteca responsável:
BR15.1
RESUMO
Human nasal polyps outgrowth culture were used to study the adhesion of Pseudomonas aeruginosa to respiratory cells. By transmission electron microscopy, bacteria associated with ciliated cells were identified trapped at the extremities of cilia, usually as aggregates of several bacterial cells. They were never seen at the interciliary spaces or attached along cilia. Bacteria were also seen to adhere to migrating cells of the periphery of the outgrowth culture. Using a model of repair of wounded respiratory epithelial cells in culture, we observed that the adhesion of P. aeruginosa to migrating cells of the edges of the repairing wounds was significantly higher than the adhesion to non-migrating cells and that adherent bacteria were surrounded by a fibrocnectin-containing fibrillar material The secretion of extracellular matrix components is involved in the process of epithelium repair following injury. To investigate the molecular basis of P. aeruginosa adhesion to migrating cells, bacteria were treated with a fibronectin solution before their incubation with the respiratory cells. P. aeruginosa treatment by fibronectin significantly increased their adhesion to migrating cells. Accordingly, we hypothesize that during cell migration, fibronectin secreted by epithelial cells may favour P. aeruginosa adhesion by establishing a bridge between the bacteria and the epithelial cell receptors. Such a mechanism may represent a critical step for P. aeruginosa infection of healing injured epithelium
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Pseudomonas aeruginosa
/
Sistema Respiratório
/
Aderência Bacteriana
/
Fibronectinas
/
Cílios
Idioma:
En
Revista:
Mem. Inst. Oswaldo Cruz
Assunto da revista:
MEDICINA TROPICAL
/
PARASITOLOGIA
Ano de publicação:
1992
Tipo de documento:
Article
País de publicação:
Brasil