Previous Article | Next Article ![]()
Infect. Immun., May 1996, 1582-1588, Vol 64, No. 5
S de Bentzmann, P Roger, F Dupuit, O Bajolet-Laudinat, C Fuchey, MC Plotkowski and E Puchelle
We investigated the implication of asialo GM1 as an epithelial receptor in
the increased Pseudomonas aeruginosa affinity for regenerating respiratory
epithelial cells from cystic fibrosis (CF) and non-CF patients. Human
respiratory epithelial cells were obtained from nasal polyps of non-CF
subjects and of CF patients homozygous for the delta F 508 transmembrane
conductance regulator protein (CFTR) mutation and cultured according to the
explant-outgrowth model. At the periphery of the outgrowth, regenerating
respiratory epithelial cells spreading over the collagen I matrix with
lamellipodia were observed, characteristic of respiratory epithelial wound
repair after injury. P aeruginosa adherence to regenerating respiratory
epithelial cells was found to be significantly greater in the delta F 508
homozygous CF group than in the non-CF group (P < 0.001). In vitro
competitive binding inhibition assays performed with rabbit polyclonal
antibody against asialo GM1 demonstrated that blocking asialo GM1 reduces
P. aeruginosa adherence to regenerating respiratory epithelial cells in
delta F 508 homozygous cultures (P < 0.001) as well as in non-CF
cultures (P < 0.001). Blocking of asialo GM1 was significantly more
efficient in CF patients than in non-CF subjects (P < 0.05).
Distribution of asialo GM1 as determined by preembedding labelling and
immunoelectron microscopy clearly demonstrated the specific apical membrane
expression of asialo GM1 by regenerating respiratory epithelial cells,
whereas other cell phenotypes did not apically express asialo GM1. These
results demonstrate that (i) asialo GM1 is an apical membrane receptor for
P. aeruginosa expressed at the surface of CF and non-CF regenerating
respiratory epithelial cells and (ii) asialo GM1 is specifically recovered
in regenerating respiratory epithelium. These results suggest that in CF,
epithelial repair represents the major event which exposes asialo GM1 for
P. aeruginosa adherence.
Copyright © 1996, American Society for Microbiology
Asialo GM1 is a receptor for Pseudomonas aeruginosa adherence to regenerating respiratory epithelial cells
Unite 314, Institut National de la Sante et de la Recherche Medicale, Centre Hospitalier Regional Maison Blanche, Reims, France.
This article has been cited by other articles:
| J. Bacteriol. | J. Virol. | Eukaryot. Cell |
|---|
| Microbiol. Mol. Biol. Rev. | Clin. Vaccine Immunol. | All ASM Journals |
|---|