Thromb Haemost 1989; 62(03): 880-884
DOI: 10.1055/s-0038-1651021
Original Article
Schattauer GmbH Stuttgart

Procoagulant Activity of T Lymphoblastoid Cells in Extrinsic and Intrinsic Coagulation Systems

T W Barrowcliffe
The National Institute for Biological Standards and Control, Potters Bar, UK
,
Dianne E Marshall
The National Institute for Biological Standards and Control, Potters Bar, UK
,
Lynne P Trickett
The National Institute for Biological Standards and Control, Potters Bar, UK
,
A R Hubbard
The National Institute for Biological Standards and Control, Potters Bar, UK
,
Elaine Gray
The National Institute for Biological Standards and Control, Potters Bar, UK
,
R Thorpe
The National Institute for Biological Standards and Control, Potters Bar, UK
› Institutsangaben
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Publikationsverlauf

Received 15. Dezember 1988

Accepted after revision 11. Juli 1989

Publikationsdatum:
30. Juni 2018 (online)

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Summary

We have measured the procoagulant activity (PCA) of four T lymphoblastoid cell lines (Jurkat, CEM, HSB-2 and Molt 4) as well as normal peripheral blood T lymphocytes, before and after stimulation with phytohaemagglutinin (PHA), using clotting and amidolytic methods.

Of the four cell lines only one, Jurkat, gave enhanced PCA after stimulation with PH A. This activity was shown to be tissue factor-like by its dependence on factor VII in plasma and in an amidolytic assay with purified factors VII and X. Jurkat was also the only one of the four cell lines to secrete interleukin-2. All four cell lines promoted the generation of large amounts of thrombin in platelet-free plasma in glass tubes. This activity was dependent on the presence of plasma factor VIII, and was probably due to phospholipids in the cell membranes. Normal T lymphocytes gave intrinsic PCA in the thrombin generation test which was only 15% of that of the lymphoma cells.

These results show that some T lymphocytes can develop PCA in both intrinsic and extrinsic systems and this should be taken into account in studies of the PCA of mixed leukocyte populations.