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Mannose-binding lectin: targeting the microbial world for complement attack and opsonophagocytosis.
D L Jack1, N J Klein, M W Turner
1Immunobiology Unit, Institute of Child Health, University College London, UK.
Immunological Reviews
|June 21, 2001
Summary
Mannose-binding lectin (MBL) binds microbes to activate the immune system. MBL deficiency increases infection risk, while MBL protein influences disease severity through cytokine modulation.
Area of Science:
- Immunology
- Microbiology
Background:
- Mannose-binding lectin (MBL) is a key component of the innate immune system.
- MBL recognizes microbial sugar structures and activates complement via MBL-associated protease-2.
Purpose of the Study:
- To investigate MBL binding to microorganisms and complement activation using flow cytometry.
- To determine the role of lipopolysaccharide (LPS) structure and capsule in MBL binding to Gram-negative bacteria.
Main Methods:
- Flow cytometry was employed to assess MBL binding to various microorganisms.
- Complement activation was measured by detecting C4 deposition following MBL binding.
Main Results:
- MBL binding to Gram-negative bacteria like Salmonella and Neisseria is primarily determined by LPS structure.
- Flow cytometry demonstrated that MBL binding initiates complement activation, leading to C4 deposition.
- This suggests MBL binding can trigger opsonophagocytosis and bacterial lysis.
Conclusions:
- MBL plays a crucial role in innate immunity by binding microbes and initiating complement cascade.
- MBL deficiency is linked to increased susceptibility to infections and autoimmune diseases.
- MBL influences disease severity, partly through its impact on cytokine production, though underlying mechanisms require further research.