Adherence of streptococcus pyogenes, Escherichia coli, and Pseudomonas aeruginosa to fibronectin-coated and uncoated epithelial cells.

Infection and Immunity
S N AbrahamW A Simpson

Abstract

The relationship between the variability in the fibronectin (Fn) content on human buccal epithelial cells and the capacity of the cells to bind gram-positive (Streptococcus pyogenes) or gram-negative (Escherichia coli or Pseudomonas aeruginosa) bacteria was investigated. Adhesion experiments performed with mixtures of epithelial cells and mixed suspensions of either S. pyogenes and E. coli or S. pyogenes and P. aeruginosa exhibited three major populations of buccal cells: one of these was able to bind S. pyogenes (gram positive) but neither of the gram-negative bacteria; a second population was able to bind the gram-negative but not the gram-positive bacteria; and a third was able to bind various numbers of both types of organisms. Further adhesion experiments performed with a mixture of epithelial cells and a mixed suspension of S. pyrogens, E. coli, and fluoresceinconjugated methacrylate beads coated with immune immunoglobulin G directed against Fn revealed that the epithelial cells recognizing the gram-positive bacteria were rich in Fn, whereas those recognizing the gram-negative organisms were poor in Fn. Immunoelectron microscopy confirmed that cells of S. pyogenes bound to epithelial cells coated with Fn, whereas cells of...Continue Reading

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