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DOI: 10.1055/s-0038-1661523
Monoclonal Antibodies to Human 54,000 Molecular Weight Plasminogen Activator Inhibitor from Fibrosarcoma Cells - Inhibitor Neutralization and One-Step Affinity Purification
Publikationsverlauf
Received 01. November 1985
Accepted 30. Januar 1986
Publikationsdatum:
18. Juli 2018 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/198602/lookinside/thumbnails/10-1055-s-0038-1661523-1.jpg)
Summary
Mouse monoclonal antibodies were derived against a plasminogen activator inhibitor with a mol.wt. of ∼54,000 (54 K) from the human fibrosarcoma cell line HT-1080. Screening for hybrids producing antibodies directed against the inhibitor was performed with enzyme-linked immunosorbent assay and SDS-polyacrylamide gel electrophoresis (SDS-PAGE) followed by immunoblotting. Four clones of hybridomas producing IgG1 antibodies were further characterized. The inhibitor was purified ∼50-fold to homogeneity from conditioned cell culture fluid with a yield of ∼85% by a one-step procedure using Sepharose-conjugated monoclonal antibody. In the 125I-fibrin plate assay one of the antibodies neutralized the effect of the inhibitor on urokinase-type plasminogen activator. Two of the antibodies bound complexes between urokinase-type plasminogen activator and inhibitor while the remaining two antibodies did not. The antibodies could be used for immunocytochemical localization of the inhibitor in HT-1080 cells. All four antibodies cross-reacted with a plasminogen activator inhibitor derived from cultured human umbilical cord endothelial cells.
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