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Visualization of Pseudomonas aeruginosa within the Sputum of Cystic Fibrosis Patients
07:25

Visualization of Pseudomonas aeruginosa within the Sputum of Cystic Fibrosis Patients

Published on: July 16, 2020

Pseudomonas aeruginosa vesicles associate with and are internalized by human lung epithelial cells

Susanne J Bauman1, Meta J Kuehn

  • 1Department of Biochemistry, Duke University Medical Center, Duke University Medical Center, Durham, NC 27710, USA.

BMC Microbiology
|February 5, 2009
PubMed
Abstract

Insights

Pseudomonas aeruginosa vesicles, particularly from cystic fibrosis (CF) isolates, readily associate with and enter lung cells. An aminopeptidase (PaAP) on the vesicle surface significantly enhances this interaction, suggesting a role in CF lung disease.

Area of Science:

  • Microbiology
  • Cell Biology
  • Pathogenesis

Background:

  • * Pseudomonas aeruginosa is a primary cause of chronic lung infections in cystic fibrosis (CF) patients.
  • * Understanding the role of bacterial vesicles in CF lung disease is crucial.

Purpose of the Study:

  • * To investigate the association of P. aeruginosa vesicles with human lung cells.
  • * To identify factors influencing vesicle-lung cell interactions.

Main Methods:

  • * Purified P. aeruginosa vesicles were incubated with human lung cells.
  • * Association and internalization were quantified using various inhibitors and markers.
  • * The role of aminopeptidase (PaAP) was assessed using knockout and overexpressing strains.

Main Results:

  • * P. aeruginosa vesicles were internalized by lung cells in a time- and dose-dependent manner.
  • * Vesicles from CF isolates showed greater association than laboratory strains.
  • * Aminopeptidase (PaAP) significantly promoted vesicle-lung cell association.
  • * Internalized vesicles were found in the endoplasmic reticulum.

Conclusions:

  • * P. aeruginosa vesicles interact with and are internalized by lung epithelial cells.
  • * PaAP is a key factor mediating vesicle association with lung cells.
  • * These interactions may contribute to the inflammatory response in CF lung infections.

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