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A method is described which enables identification of the molecular size of alpha 1-proteinase inhibitor (alpha 1-PI) in biological fluids. This technique when applied to bronchoalveolar lavage fluids clearly demonstrates alpha 1-PI in three molecular forms; the native molecule (Mr approximately equal to ++54 000), a partially proteolysed form (Mr approximately equal to 49 000) and in a form suggestive of a complex with enzyme (Mr approximately equal to 82 000). Samples showing the presence of native alpha 1-PI inhibited more porcine pancreatic elastase than samples where no native alpha 1-PI was seen or where the predominant form was partially proteolysed alpha 1-PI (p less than 0.01). Although the predominant band of alpha 1-PI was more frequently the partially proteolysed form in current smokers (p less than 0.01), there was no clear difference in the inhibitory function of alpha 1-PI between current smokers and non-smokers and those with and without airflow obstruction.

Qualitative Studies of Lung Lavage α 1 -Proteinase Inhibitor