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Sialic acids acquired by Pseudomonas aeruginosa are involved in reduced complement deposition and siglec mediated

Biswajit Khatua1, Angana Ghoshal, Kaushik Bhattacharya

  • 1Infectious Diseases and Immunology Division, Indian Institute of Chemical Biology, Kolkata, India.

FEBS Letters
|December 1, 2009
PubMed

Insights

Pseudomonas aeruginosa (PA) can acquire sialic acids (Sia), which helps it evade immune responses by reducing complement deposition and enhancing binding to host cells. This suggests Sia contributes to PA pathogenicity in immunocompromised individuals.

Area of Science:

  • Microbiology
  • Immunology
  • Biochemistry

Background:

  • Pseudomonas aeruginosa (PA) is an opportunistic pathogen frequently causing infections in immunocompromised hosts.
  • The mechanisms underlying PA's opportunism, particularly host-cell interactions, require further elucidation.

Purpose of the Study:

  • To investigate the role of sialic acids (Sia) in the pathogenicity of Pseudomonas aeruginosa.
  • To determine how Sia incorporation affects bacterial-host interactions and immune evasion.

Main Methods:

  • Culturing PA with exogenous sialic acids.
  • Assessing complement deposition on Sia-modified PA.
  • Evaluating bacterial binding to host cells and recombinant siglecs via flow cytometry.

Main Results:

  • PA incorporated exogenous Sia in a linkage-specific manner.
  • Sia acquisition by PA led to decreased complement deposition.
  • Sia-coated PA exhibited enhanced binding to siglec-expressing cells (CHO cells, NK cells, monocytes).

Conclusions:

  • Sialic acids can be acquired by Pseudomonas aeruginosa in a host environment.
  • Acquired Sia contributes to PA pathogenicity by reducing complement-mediated immunity and facilitating host-cell recognition through siglec interactions.

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