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Immunoglobulins in the bronchial washings of patients with chronic obstructive pulmonary disease.

Concentrations of immunoglobulins G, A, and M (IgG, IgA, and IgM) were measured by radial immunodiffusion in the serum and bronchial washings of 6 patients with chronic obstructive pulmonary disease, 6 control subjects, and 22 patients with various bronchopulmonary disorders. Most bronchial washings contained detectable amounts of IgG and IgA but not IgM. One patient with chronic obstructive pulmonary disease lacked IgA in bronchial washings, serum, and parotid saliva and had unusually high concentrations of IgG and IgM in bronchial washings. Bronchial washings from a second patient lacked detectable IgG and contained IgA. Average concentrations of IgG and IgA were similar in bronchial washings from patients with chronic obstructive pulmonary disease and control subjects. Examination of 34 paired samples of bronchial washings and serum revealed that the average ratio of the concentration of IgA or IgG to the concentration of albumin was significantly greater in bronchial washings than in serum. It was con...