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Association between mannan-binding lectin and impaired lung function in cystic fibrosis may be age-dependent

M S Muhlebach1, S L MacDonald, B Button

  • 1Department of Pediatrics, University of North Carolina, Chapel Hill, NC, USA.

Clinical and Experimental Immunology
|August 2, 2006
PubMed

Insights

Mannan-binding lectin (MBL) deficiency in cystic fibrosis (CF) patients over 15 accelerates lung function decline. MBL levels impact CF lung health differently based on age, suggesting potential MBL replacement therapy for some patients.

Area of Science:

  • Immunology
  • Pulmonology
  • Genetics

Background:

  • Mannan-binding lectin (MBL) is crucial for innate immunity.
  • Conflicting studies exist on MBL's role in cystic fibrosis (CF) lung function.
  • L-ficolin is another lectin involved in the immune system.

Purpose of the Study:

  • Investigate the association between MBL and L-ficolin levels and lung function in CF patients.
  • Explore age-dependent effects of MBL on CF lung function.
  • Clarify discrepancies in previous research regarding MBL and CF severity.

Main Methods:

  • Measured MBL and L-ficolin concentrations in CF patients.
  • Correlated lectin levels with lung function parameters, specifically forced expiratory volume in 1 second (FEV(1)).
  • Analyzed results stratified by patient age (under and over 15 years).

Main Results:

  • In CF patients under 15, MBL deficiency (< 200 ng/ml) was associated with better lung function (FEV(1) 99% vs. 83%).
  • In CF patients over 15, MBL deficiency was linked to poorer lung function (FEV(1) 44% vs. 55%) and a higher proportion of patients with below-median FEV(1).
  • No significant association was found between L-ficolin levels and lung function in CF patients.

Conclusions:

  • Relative MBL deficiency appears to accelerate age-related lung function decline in cystic fibrosis patients over 15.
  • MBL status influences CF lung health differently across age groups.
  • Findings support the potential therapeutic value of MBL replacement in a subset of CF patients.

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