Systemic and mucosal antibody response to Moraxella catarrhalis after exacerbations of chronic obstructive pulmonary disease.

To characterize the immune response to Moraxella catarrhalis after exacerbations of chronic obstructive pulmonary disease (COPD), pre- and postexacerbation serum and sputum supernatant samples obtained during 21 exacerbations in 18 patients were studied, using the homologous infecting isolates. New serum immunoglobulin G (IgG) detected by whole-cell enzyme-linked immunosorbent assay developed after 12 (57.1%) of 21 exacerbations. Analysis of serum samples with flow cytometry, which detects antibodies that are exclusive to epitopes on the bacterial surface, revealed that 5 (23.8%) of the 21 exacerbations were associated with the development of new serum IgG to surface epitopes. Three of these serum samples and 2 other serum samples contained new IgG directed at lipooligosaccharide. Flow cytometry revealed that new mucosal IgA to surface-exposed epitopes of the infecting isolate developed in sputum supernatants after 42% of exacerbations. Therefore, adults with COPD develop variable humoral immune responses to M. catarrhalis after exacerbations, including new serum IgG and new mucosal IgA to epitopes on the bacterial surface.

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