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The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic...
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Analysis of complement deposition and processing on Chlamydia trachomatis.

Mads Lausen1, Mikkel Eggert Thomsen2, Gunna Christiansen2,3

  • 1Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 3b, 9220, Aalborg Ø, Denmark. mln@hst.aau.dk.

Medical Microbiology and Immunology
|November 18, 2020
PubMed
Summary

Chlamydia trachomatis triggers complement activation via multiple pathways, leading to opsonization that aids bacterial binding to B-cells. This study details complement deposition on Chlamydia trachomatis, revealing insights into host immune responses.

Keywords:
B-cellsC3Chlamydia trachomatisComplementMass spectrometryOpsonization

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Area of Science:

  • Immunology
  • Microbiology
  • Proteomics

Background:

  • Chlamydia trachomatis is a major cause of bacterial sexually transmitted infections, leading to severe reproductive complications.
  • Infections often persist, cause immunopathology, and fail to induce protective immunity, resulting in recurrent infections.
  • The role of the complement system in Chlamydia trachomatis immunity is significant but not fully understood.

Purpose of the Study:

  • To investigate the mechanisms of complement-mediated immunity against Chlamydia trachomatis.
  • To analyze global complement deposition on Chlamydia trachomatis using mass spectrometry-based proteomics.

Main Methods:

  • Comprehensive in-depth mass spectrometry-based proteomics to analyze complement deposition.
  • Immunoelectron microscopy to visualize complement complex formation.
  • Cleavage analysis of C3 to identify opsonins.

Main Results:

  • Factor B, properdin, and C4b bind to Chlamydia trachomatis, indicating activation through at least two complement pathways.
  • Complement activation leads to C3 and C5 cleavage products and terminal pathway initiation (C5b-9 deposition).
  • C5b-9 deposition is sporadic, with limited formation of complete lytic complexes, potentially due to negative regulators. Deposited C3b is degraded to iC3b and C3dg, facilitating bacterial binding to B-cells.

Conclusions:

  • Chlamydia trachomatis activates the complement system through multiple pathways.
  • Complement opsonization, particularly via iC3b and C3dg, enhances Chlamydia trachomatis binding to human B-cells.
  • Understanding these interactions is crucial for developing strategies against Chlamydia trachomatis infections.