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Randomized Controlled Trial
. 2012:7:767-77.
doi: 10.2147/COPD.S33714. Epub 2012 Nov 23.

Mannose-binding lectin deficiency and acute exacerbations of chronic obstructive pulmonary disease

Richard K Albert  1 , John Connett, Jeffrey L Curtis, Fernando J Martinez, Meilan K Han, Stephen C Lazarus, Prescott G Woodruff
Affiliations
Randomized Controlled Trial

Mannose-binding lectin deficiency and acute exacerbations of chronic obstructive pulmonary disease

Richard K Albert et al. Int J Chron Obstruct Pulmon Dis. 2012.

Abstract

Background: Mannose-binding lectin is a collectin involved in host defense against infection. Whether mannose-binding lectin deficiency is associated with acute exacerbations of chronic obstructive pulmonary disease is debated.

Methods: Participants in a study designed to determine if azithromycin taken daily for one year decreased acute exacerbations had serum mannose-binding lectin concentrations measured at the time of enrollment.

Results: Samples were obtained from 1037 subjects (91%) in the trial. The prevalence of mannose-binding lectin deficiency ranged from 0.5% to 52.2%, depending on how deficiency was defined. No differences in the prevalence of deficiency were observed with respect to any demographic variable assessed, and no differences were observed in time to first exacerbation, rate of exacerbations, or percentage of subjects requiring hospitalization for exacerbations in those with deficiency versus those without, regardless of how deficiency was defined.

Conclusion: In a large sample of subjects with chronic obstructive pulmonary disease selected for having an increased risk of experiencing an acute exacerbation of chronic obstructive pulmonary disease, only 1.9% had mannose-binding lectin concentrations below the normal range and we found no association between mannose-binding lectin concentrations and time to first acute exacerbation or frequency of acute exacerbations during one year of prospective follow-up.

Trial registration: ClinicalTrials.gov NCT00325897.

Keywords: COPD; acute exacerbations; mannose-binding lectin.

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Figures

Figure 1
Figure 1
Proportions free of exacerbations MBL concentrations < 100 vs 100 or larger in all subjects (A) subjects receiving azithromycin (B) and in subjects receiving the placebo (C). Abbreviations: COPD, chronic obstructive pulmonary disease; MBL, mannose binding lectin.
Figure 2
Figure 2
Proportions free of exacerbations MBL concentrations < 500 vs 500 or larger in all subjects (A) subjects receiving azithromycin (B) and in subjects receiving the placebo (C). Abbreviations: COPD, chronic obstructive pulmonary disease; MBL, mannose binding lectin.
Figure 3
Figure 3
Proportions free of exacerbations MBL concentrations between 50 and 1000 vs 1000 or larger in all subjects (A) subjects receiving azithromycin (B) and in subjects receiving the placebo (C). Abbreviations: COPD, chronic obstructive pulmonary disease; MBL, mannose binding lectin.
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References

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