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Complement binding to Aspergillus conidia correlates with pathogenicity

S Henwick1, S V Hetherington, C C Patrick

  • 1Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, TN 38101-0318.

The Journal of Laboratory and Clinical Medicine
|July 1, 1993
PubMed
Summary
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The study reveals that less pathogenic Aspergillus species bind more complement component C3 to their spores than highly pathogenic ones. This difference in complement C3 binding may influence phagocytosis and fungal infection outcomes.

Area of Science:

  • Immunology
  • Mycology
  • Microbiology

Background:

  • Complement component C3 plays a crucial role in the immune response, particularly in opsonization and phagocytosis of microbial pathogens.
  • Aspergillus species are opportunistic fungal pathogens that cause a range of infections, with varying degrees of pathogenicity.

Purpose of the Study:

  • To quantify and characterize complement component C3 binding to resting conidia of various Aspergillus species.
  • To investigate the relationship between complement C3 deposition and the pathogenicity of different Aspergillus species.

Main Methods:

  • Quantitative flow cytometry was used to measure the amount of C3 bound per conidial surface area.
  • Immunoblot analysis was employed to identify the specific C3 fragments (C3b, iC3b, C3dg) present on the conidia.

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Main Results:

  • Highly pathogenic Aspergillus species (A. fumigatus, A. flavus) bound significantly less C3 per conidial surface area compared to less pathogenic species.
  • For most species, C3b was predominantly converted to iC3b on the conidia; however, A. niger and A. nidulans showed further breakdown to C3dg.
  • Significant intraspecies variation in C3 binding and size was observed among different isolates within the same Aspergillus species.

Conclusions:

  • The level of complement C3 deposition on Aspergillus conidia correlates inversely with pathogenicity.
  • The specific C3 fragments bound to conidia may differ between Aspergillus species, potentially affecting phagocytosis.
  • Intraspecies variability in C3 binding could explain discrepancies in previous studies on Aspergillus phagocytosis and host immune response.