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Mannose-binding lectin deficiency--revisited.

Peter Garred1, Flemming Larsen, Hans O Madsen

  • 1Department of Clinical Immunology, Tissue Typing Laboratory-7631, Rigshospitalet, Blegdamsvej 9, DK-2100 Copenhagen, Denmark. garred@post5.tele.dk

Molecular Immunology
|August 14, 2003
PubMed
Summary
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Mannose-binding lectin (MBL) gene variants affect MBL levels and function. While variant MBL is abundant, it is low molecular weight and dysfunctional, impacting innate immunity. The relevance of this variant MBL requires further study.

Area of Science:

  • Immunology
  • Genetics

Background:

  • Mannose-binding lectin (MBL) plays a crucial role in innate immunity.
  • MBL levels and function are influenced by genetic polymorphisms in the mbl2 gene.
  • Previous studies suggested structural variants decrease functional MBL concentration.

Purpose of the Study:

  • To investigate the impact of MBL gene polymorphisms on MBL levels and function.
  • To re-evaluate the relationship between MBL structural variants and serum concentrations.
  • To characterize the molecular weight and functional activity of MBL variants.

Main Methods:

  • Analysis of 1183 serum samples using double sandwich antibody ELISA.
  • Utilized a novel anti-MBL monoclonal antibody for MBL quantification.
  • Molecular characterization of MBL oligomers (high vs. low molecular weight).

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Main Results:

  • MBL promoter variants significantly affect MBL serum concentration.
  • Structural variant alleles have a lesser impact on MBL circulation levels than previously thought.
  • Sera with variant alleles contained predominantly low molecular weight MBL, which is dysfunctional.
  • High molecular weight MBL efficiently binds mannan and activates complement.

Conclusions:

  • Variant MBL alleles lead to relatively high circulating levels but result in dysfunctional, low molecular weight MBL.
  • The functional consequence of variant MBL in innate immunity warrants further investigation.
  • MBL genetic variations significantly impact immune response pathways.