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Thromb Haemost 1995; 73(01): 112-117
DOI: 10.1055/s-0038-1653734
Original Article
Fibrinolysis
Schattauer GmbH Stuttgart

The Role of Fibrinolysis in the Pathogenesis of the Haemorrhagic Syndrome Produced by Virulent Isolates of African Swine Fever Virus

C J Villeda
1   The Centro de Biología Molecular (CSIC-UAM), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
,
J C Gómez-Villamandos
2   Departamento de Anatomía y Anatomía Patológica Comparada, Facultad de Veterinaria, Universidad de Córdoba, Córdoba, Spain
,
S M Williams
3   The Institute for Animal Health, Pirbright Laboratory, Pirbright, Surrey, UK
,
J Hervás
2   Departamento de Anatomía y Anatomía Patológica Comparada, Facultad de Veterinaria, Universidad de Córdoba, Córdoba, Spain
,
P J Wilkinson
3   The Institute for Animal Health, Pirbright Laboratory, Pirbright, Surrey, UK
,
E Viñuela
1   The Centro de Biología Molecular (CSIC-UAM), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
› Author Affiliations
Further Information

Publication History

Received 10 May 1994

Accepted after revision 27 September 1994

Publication Date:
09 July 2018 (online)

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Summary

The activity of several proteins involved in fibrinolysis and the morphological changes in the blood vessel walls of pigs infected with highly virulent (Malawi’83) and moderately virulent (Dominican Republic ‘78-DR’78) ASF virus isolates were determined. Pigs infected with the Malawi’83 virus developed an increased fibrinolytic activity due to high plasma levels of tissue-plasminogen activator (t-PA) of 71.3 ± 22.8 IU/ml (mean ± SD), which correlated well with an increased activation of interstitial capillary endothelial cells and high levels of 1150 ± 73.6 nM of fibrin monomer in the circulation. Animals infected with DR’78 virus, in contrast, showed an inhibition of fibrinolysis in the late stages of disease with almost a 5-fold increase of plasminogen activator inhibitor (PAI) activity of 196.0 AU/ml. These results suggest that activation of the fibrinolytic system in pigs infected with the Malawi’83 virus is probably due to increased formation and deposition of fibrin in the circulation, contributing to an increased bleeding tendency and higher mortality. On the contrary, animals infected with DR’78 virus developed an inhibition of fibrinolysis and thus a reduction in bleeding.

 

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