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Mannose-binding lectin binds to a range of clinically relevant microorganisms and promotes complement deposition
1Immunobiology Unit, Institute of Child Health, University College London, NHS Trust, London, United Kingdom.
Infection and Immunity
|January 20, 2000
Summary
Mannose-binding lectin (MBL) is crucial for innate immunity. This study shows MBL binds strongly to key pathogens like Candida and Staphylococcus, aiding immune defense in immunocompromised children.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Mannose-binding lectin (MBL) is a key component of the innate immune system.
- Low MBL levels are associated with increased susceptibility to infections.
Purpose of the Study:
- To investigate the binding of MBL to various pathogens commonly found in immunocompromised children.
- To assess MBL's ability to promote complement activation.
Main Methods:
- Purified MBL was used to analyze binding to clinical isolates via flow cytometry.
- Complement C4 deposition was measured to assess MBL's functional activity.
Main Results:
- Strong MBL binding was observed for Candida species, Aspergillus fumigatus, Staphylococcus aureus, and beta-hemolytic group A streptococci.
- Escherichia coli, Klebsiella species, and Haemophilus influenzae type b showed heterogeneous binding.
- Beta-hemolytic group B streptococci, Streptococcus pneumoniae, and Staphylococcus epidermidis exhibited low MBL binding.
- Bound MBL effectively promoted complement C4 deposition in a dose-dependent manner.
Conclusions:
- MBL plays a significant role in the initial immune defense against a range of important human pathogens.
- These findings highlight MBL's potential as a therapeutic target for infections in immunocompromised individuals.