Thromb Haemost 2000; 84(03): 453-459
DOI: 10.1055/s-0037-1614044
Commentary
Schattauer GmbH

Fibrin Down-regulates LPS- and PMA-induced Tissue Factor Expression by Blood Mononuclear Cells

Maria Rosaria Rossiello
1   From the Dipartimento di Scienze Biomediche e Oncologia Umana, Sezione di Patologia Generale, Bari, Italy
,
Alessandra Italia
1   From the Dipartimento di Scienze Biomediche e Oncologia Umana, Sezione di Patologia Generale, Bari, Italy
,
Anna M. Stramaglia
1   From the Dipartimento di Scienze Biomediche e Oncologia Umana, Sezione di Patologia Generale, Bari, Italy
,
Loreto Gesualdo
2   Dipartimento dell’Emergenza e dei Trapianti d’Organi, Sezione di Nefrologia, University of Bari, Bari, Italy
,
Giuseppe Grandaliano
2   Dipartimento dell’Emergenza e dei Trapianti d’Organi, Sezione di Nefrologia, University of Bari, Bari, Italy
,
Francesco P. Schena
2   Dipartimento dell’Emergenza e dei Trapianti d’Organi, Sezione di Nefrologia, University of Bari, Bari, Italy
,
Nicola Semeraro
1   From the Dipartimento di Scienze Biomediche e Oncologia Umana, Sezione di Patologia Generale, Bari, Italy
,
Mario Colucci
1   From the Dipartimento di Scienze Biomediche e Oncologia Umana, Sezione di Patologia Generale, Bari, Italy
› Author Affiliations
This work was supported in part by a grant from Italian MURST (Ministero della Università e della Ricerca Scientifica e Tecnologica).
Further Information

Publication History

Received 28 December 1999

Accepted after resubmissiopn 10 April 2000

Publication Date:
14 December 2017 (online)

Summary

Several studies indicate that fibrin may play a functional role in inflammation by modulating a variety of cellular functions. We investigated the effect of fibrin on tissue factor (TF) production by blood mononuclear cells (MNC). Citrated human blood was recalcified and incubated at 37° C for 1-4 h. The resulting clot was lysed by the addition of tissue plasminogen activator (t-PA) and MNC were isolated by density gradient centrifugation. A control blood sample was processed in the same way but omitting calcium addition and clot formation. Clot-and blood-derived MNC did not express detectable TF activity and antigen whatever the incubation time. Clot-derived MNC, however, generated on average 5 fold less TF (activity and antigen) than control cells, when stimulated with lipopolysaccharide (LPS, 1 µg/ml) for 3 h at 37° C. A reduced TF response of clot-derived cells was also observed at mRNA level as indicated by RT-PCR and in situ hybridization. The effect was dependent on the incubation time within the clot, could not be reversed by enhancing LPS concentration or by adding serum, and was maintained if LPS was replaced by the tumor promoter PMA. A reduced TF response was also found when washed MNC were incorporated for 1 h at 37° C within purified fibrin but not when the cells were incubated with fibrinogen, thrombin or fibrin split products alone, indicating that contact with fibrin was responsible for the inhibition of TF production. Fibrin-induced down-regulation of TF response to LPS and PMA by MNC may represent a negative feed-back aimed at limiting excessive blood clotting activation in immuneinflammatory diseases.

 
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