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Related Experiment Videos

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
PubMed
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.

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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.

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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.