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Updated: May 4, 2026

Opsono-Adherence Assay to Evaluate Functional Antibodies in Vaccine Development Against Bacillus anthracis and Other Encapsulated Pathogens
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Masquerading microbial pathogens: capsular polysaccharides mimic host-tissue molecules.

Brady F Cress1, Jacob A Englaender, Wenqin He

  • 1Department of Chemical and Biological Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, USA.

FEMS Microbiology Reviews
|December 31, 2013
PubMed
Summary
This summary is machine-generated.

The rise of antibiotic-resistant bacteria necessitates new treatments. Bacterial capsules, particularly those mimicking host molecules, offer novel therapeutic targets to combat infections and evade immune responses.

Keywords:
bacterial pathogenscapsular polysaccharidescombating antibiotic resistanceglycosaminoglycansimmune system evasionpolysialic acid

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Area of Science:

  • Microbiology
  • Immunology
  • Biochemistry

Background:

  • Antibiotic resistance is rising, leading to a postantibiotic era.
  • Bacterial capsules are key virulence factors, protecting pathogens from immune responses.
  • Some capsules mimic host molecules, evading immune detection.

Purpose of the Study:

  • To review bacterial capsular polysaccharides that resemble host molecules.
  • To explore their role in immune evasion and virulence.
  • To identify potential therapeutic targets against multidrug-resistant organisms.

Main Methods:

  • Literature review of bacterial capsules and host polysaccharide mimicry.
  • Analysis of biosynthetic pathways for capsular polysaccharides.
  • Examination of capsular polysaccharides' role in immune evasion.

Main Results:

  • Capsular polysaccharides like polysialic acid, hyaluronan, heparosan, and chondroitin are structurally similar to mammalian polysaccharides.
  • These nonimmunogenic capsules hide bacterial surface components, preventing immune recognition.
  • Mimicking host molecules enhances pathogen persistence and virulence.

Conclusions:

  • Bacterial capsules that mimic host polysaccharides are crucial for immune evasion.
  • Targeting these capsules presents a promising strategy for novel therapeutics.
  • Understanding capsule biosynthesis and function can guide the development of alternative treatments to antibiotics.