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Neither resting nor stimulated isolated human polymorphonuclear leukocytes did bind or ingest preformed complexes of alpha 1-proteinase inhibitor and unlabeled/125I-labeled human leukocyte elastase. In contrast, granulocytes bound unlabeled/125I-labeled elastase and the extent of binding was reduced in the presence of respiratory burst stimulators, such as 4 beta-phorbol 12 beta-myristate 13 alpha-acetate, E. coli endotoxin, and N-formyl-L-methionyl-L-leucyl-L-phenylalanine. In association/dissociation and competition inhibition experiments it was demonstrated that granulocyte-elastase binding was specific and saturable. From Scatchard and non-linear regression analysis there was evidence of a two-class receptor model with independent binding sites. Calculated by the non-linear regression method assuming a two-class receptor model the characteristics of the high affinity/low capacity binding site were K1 = 216 +/- 129 X 10(6) l X mol-1 (means +/- s; n = 3) and R1 = 1.38 +/- 0.95 nmol X l-1 corresponding to 0.083 X 10(6) receptors per cell, whereas the low affinity/high capacity binding site had the characteristics K2 = 0.50 +/- 0.09 X 10(6) l X mol-1 and R2 = 237 +/- 103 nmol X l-1 corresponding to 14.3 +/- 6.2 X 10(6) receptors per cell.

Evaluation of Elastase and α 1 -Proteinase Inhibitor-Elastase Uptake by Polymorphonuclear Leukocytes and Evidence of an Elastase-Specific Receptor