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Related Experiment Videos

Helicobacter pylori urease significantly reduces opsonization by human complement

E Rokita1, A Makristathis, E Presterl

  • 1Department of Clinical Microbiology, Hygiene-Institute of the University of Vienna, Austria.

The Journal of Infectious Diseases
|October 21, 1998
PubMed
Summary

Helicobacter pylori urease hinders complement opsonization. A urease subunit mutation significantly boosted bacterial complement C3b binding, indicating urease

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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Helicobacter pylori is a bacterium that colonizes the human stomach.
  • Urease is a key enzyme produced by H. pylori.
  • The role of urease in immune evasion is not fully understood.

Purpose of the Study:

  • To investigate the role of Helicobacter pylori urease in opsonization by human complement.
  • To determine how urease affects the binding of complement component C3b to H. pylori.

Main Methods:

  • Incubation of H. pylori wild type and urease mutants (lacking UreB or UreG) with human sera.
  • Measurement of C3b deposition on bacteria using flow cytometry.
  • Assessment of complement pathway activation (classical and alternative).

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Main Results:

  • Opsonization of a UreB-lacking mutant was significantly increased compared to wild type and UreG mutant.
  • Complement activation for the UreB mutant was mainly dependent on the classical pathway.
  • Reduced opsonization of urease-expressing strains may involve C3b degradation.

Conclusions:

  • Helicobacter pylori urease plays a significant role in inhibiting complement-mediated opsonization.
  • The large urease subunit (UreB) is crucial for this inhibitory effect.
  • Targeting urease could enhance complement-mediated clearance of H. pylori.