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Thromb Haemost 1990; 63(03): 417-423
DOI: 10.1055/s-0038-1645058
Original Article
Schattauer GmbH Stuttgart

Characterization of a Panel of Monoclonal Antibodies to Human Coagulation Factor XI and Detection of Factor XI in Hep G2 Cell Conditioned Medium

Y Ohkubo
The Haemostasis Research Group, Clinical Research Centre, Harrow, Middx., U. K.
,
D P O’Brien
The Haemostasis Research Group, Clinical Research Centre, Harrow, Middx., U. K.
,
T Kanehiro
*   The Paediatric Department, Nara Medical College, Nara, Japan
,
H Fukui
*   The Paediatric Department, Nara Medical College, Nara, Japan
,
E G D Tuddenham
The Haemostasis Research Group, Clinical Research Centre, Harrow, Middx., U. K.
› Author Affiliations
Further Information

Publication History

Received 08 September 1989

Accepted after revision 30 January 1990

Publication Date:
30 June 2018 (online)

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Summary

We have produced a panel of ten monoclonal antibodies specific to coagulation factor XI. Western blot analysis demonstrates that 9 of these antibodies react with the heavy chain of factor XI and one with the light chain. Seven of these antibodies inhibit factor XI and factor XIa activity.

We have used immobilised monoclonal antibody for the production of factor XI deficient plasma and to purify factor XI to homogeneity with high yield in a simple two-step procedure. These monoclonal antibodies were used to develop highly sensitive immunoassays capable of detecting less than 0.01 u factor XI antigen ml−1. A strong correlation was found between antigen and activity levels in 11 patients with hereditary deficiency indicating that none was cross-reacting material positive. Cultured Hep G2 cells were found to synthesize small amounts of factor XI antigen and this could also be detected by functional assay and by western blot analysis.

 

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