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Related Experiment Videos

Differential microorganism-induced mannose-binding lectin activation.

Saskia Kuipers1, Piet C Aerts, Hans van Dijk

  • 1Eijkman-Winkler Center for Microbiology, Inflammation and Infectious Diseases, University Medical Center Utrecht, G04.614, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. skuipers@labmicta.nl

FEMS Immunology and Medical Microbiology
|May 3, 2003
PubMed
Summary

Mannose-binding lectin (MBL), a key immune protein, activates the complement system. This study reveals how various microbes, including Neisseria meningitidis and Pseudomonas aeruginosa, trigger MBL, impacting infection susceptibility.

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Area of Science:

  • Immunology
  • Microbiology
  • Genetics

Background:

  • Mannose-binding lectin (MBL) is a crucial serum complement factor in innate immunity.
  • MBL activation of the lectin complement pathway (LCP) is vital for microbial recognition and elimination.
  • Genetic variations in MBL can lead to reduced activity, increasing susceptibility to recurrent infections.

Purpose of the Study:

  • To quantify the activation of MBL by different microbial species using a functional assay.
  • To investigate the MBL-activating potential of specific pathogens relevant to human health.
  • To explore the relationship between microbial load and MBL-mediated complement activation.

Main Methods:

  • A functional Mannose-binding lectin (MBL) assay was employed.

Related Experiment Videos

  • Various microbial concentrations, including colony-forming units (CFU), were tested for MBL activation.
  • Specific microorganisms such as Neisseria meningitidis, Nocardia farcinica, Legionella pneumophila, and Pseudomonas aeruginosa were utilized.

    • Main Results:

    • Very low concentrations of Neisseria meningitidis (less than 1 CFU) effectively activated MBL, potentially due to filterable blebs.
    • Nocardia farcinica and Legionella pneumophila demonstrated potent MBL activation, prompting further investigation into host susceptibility.
    • Pseudomonas aeruginosa exhibited strong activation of the lectin complement pathway, contrary to some previous findings.

    Conclusions:

    • The study quantifies MBL activation thresholds for several clinically relevant microbes.
    • Findings highlight the potent MBL-activating capacity of Neisseria meningitidis and Pseudomonas aeruginosa.
    • Results underscore the importance of MBL function in combating diverse microbial threats and suggest implications for infection susceptibility.