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The human mannose-binding protein functions as an opsonin.
M Kuhlman1, K Joiner, R A Ezekowitz
1Harvard Department of Pediatrics, Children's Hospital, Boston, Massachusetts 02115.
The Journal of Experimental Medicine
|May 1, 1989
Summary
Human mannose-binding protein (MBP) acts as an opsonin, enhancing the immune system's ability to clear mannose-rich pathogens. This protein facilitates phagocyte uptake and killing of bacteria like Salmonella montevideo.
Area of Science:
- Immunology
- Biochemistry
- Microbiology
Background:
- Human mannose-binding protein (MBP) is a serum protein with unknown function, though its mannan-binding ability suggests a role in host defense.
- MBP possesses a tripartite structure including N-terminal cysteine-rich, collagen-like, and C-terminal carbohydrate-binding domains.
Purpose of the Study:
- To investigate the functional role of human mannose-binding protein (MBP) in host defense.
- To determine if MBP can act as an opsonin to enhance pathogen clearance by phagocytes.
Main Methods:
- Utilized native and recombinant human MBP.
- Tested MBP's interaction with wild-type virulent Salmonella montevideo expressing mannose-rich O-polysaccharide.
- Assessed the enhancement of bacterial attachment, uptake, and killing by phagocytes.
Main Results:
- Human MBP demonstrated an opsonic role, enhancing the clearance of mannose-rich pathogens.
- MBP effectively bound to Salmonella montevideo.
- MBP-mediated opsonization led to increased attachment, uptake, and killing of bacteria by phagocytes.
Conclusions:
- Human mannose-binding protein (MBP) plays a significant role in first-line host defense against specific pathogenic organisms.
- MBP functions as an opsonin, promoting the elimination of mannose-rich bacteria by phagocytic cells.