Cited by 222Bacterial biofilms and quorum sensingBiochemical and Structural CharacterizationEscherichia coli research studies

Pseudomonas aeruginosa pili and flagella mediate distinct binding and signaling events at the apical and basolateral surface of airway epithelium.

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Bucior, Iwona, Pielage, Julia F., Engel, Joanne N.·2012·PLoS Pathogens

Abstract

Pseudomonas aeruginosa, an important opportunistic pathogen of man, exploits numerous factors for initial attachment to the host, an event required to establish bacterial infection. In this paper, we rigorously explore the role of two major bacterial adhesins, type IV pili (Tfp) and flagella, in bacterial adherence to distinct host receptors at the apical (AP) and basolateral (BL) surfaces of polarized lung epithelial cells and induction of subsequent host signaling and pathogenic events. Using an isogenic mutant of P. aeruginosa that lacks flagella or utilizing beads coated with purified Tfp, we establish that Tfp are necessary and sufficient for maximal binding to host N-glycans at the AP surface of polarized epithelium. In contrast, experiments utilizing a P. aeruginosa isogenic mutant that lacks Tfp or using beads coated with purified flagella demonstrate that flagella are necessary and sufficient for maximal binding to heparan sulfate (HS) chains of heparan sulfate proteoglycans (HSPGs) at the BL surface of polarized epithelium. Using two different cell-free systems, we demonstrate that Tfp-coated beads show highest binding affinity to complex N-glycan chains coated onto plastic plates and preferentially aggregate with beads coated with N-glycans, but not with single sugars or HS. In contrast, flagella-coated beads bind to or aggregate preferentially with HS or HSPGs, but demonstrate little binding to N-glycans. We further show that Tfp-mediated binding to host N-glycans results in activation of phosphatidylinositol 3-kinase (PI3K)/Akt pathway and bacterial entry at the AP surface. At the BL surface, flagella-mediated binding to HS activates the epidermal growth factor receptor (EGFR), adaptor protein Shc, and PI3K/Akt, and induces bacterial entry. Remarkably, flagella-coated beads alone can activate EGFR and Shc. Together, this work provides new insights into the intricate interactions between P. aeruginosa and lung epithelium that may be potentially useful in the development of novel treatments for P. aeruginosa infections.

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  • Exposure of apical receptors like integrins permits adhesion of bacteria such as S. aureus and P. aeruginosa.

    “For example the exposure of apical receptors like integrins permit the adhesion of bacteria such as S. aureus and P. aeruginosa (Sanford et al., 1978; Davison and Sanford, 1981; Bucior et al., 2012; Smith and McCullers, 2014).”

    From Secondary bacterial infections associated with influenza pandemics (2017) · cites this paper as Bucior et al., 2012

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Authors
Bucior, I., Pielage, J. F., & Engel, J. N.
Affiliations
University of California, San Francisco (US)
Corresponding author
  • Bucior, Iwona
  • Pielage, Julia F.
  • Engel, Joanne N.
Venue
PLoS Pathogens
Published
2012-04-05
Volume
8
Issue
4
Pages
e1002616
ISSN
  • 1553-7366 (ISSN-L)
  • 1553-7374
OpenAlex
W2073200952
Cited by
221
References
66
Citations by year
2026: 9 · 2025: 17 · 2024: 13 · 2023: 21 · 2022: 15 · 2021: 13 · 2020: 17 · 2019: 17 · 2018: 15 · 2017: 20 · 2016: 14 · 2015: 10 · 2014: 24 · 2013: 14 · 2012: 2
FWCI
6.42
Type
journal article
Language
en
Open access
Locations
  • PLoS Pathogens (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • National Institutes of Health
  • National Institute of Allergy and Infectious Diseases (P01AI053194, R01AI065902)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bacterial biofilms and quorum sensing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
Keywords
Pseudomonas aeruginosa, type IV pili, bacterial flagellum, bacterial adhesion, lung epithelium, N-glycans, heparan sulfate proteoglycans, phosphatidylinositol 3-kinase/Akt signaling, epidermal growth factor receptor, Shc adaptor protein, bacterial invasion, host-pathogen interaction, airway infection
MeSH terms
Bacterial Adhesion, Cell Line, Enzyme Activation, Flagella, Heparin, Humans, Lung, Mutation, Fimbriae, Bacterial, Pseudomonas aeruginosa, Pseudomonas Infections, Adhesins, Bacterial, Heparan Sulfate Proteoglycans, Phosphatidylinositol 3-Kinases, Respiratory Mucosa, Proto-Oncogene Proteins c-akt, ErbB Receptors

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