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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Protein C inhibitor and other components of the protein C pathway in patients with acute deep vein thrombosis during heparin treatment.

The protein C inhibitor (PCI) concentration and other parameters of the protein C pathway were studied in 19 patients with symptomatic acute deep vein thrombosis before and during the first 5 days of heparin treatment. The mean levels of PCI antigen and activity decreased rapidly and significantly during the first day of heparin therapy from 83 and 84% to 60 and 59% of the pooled normal human plasma (p less than 0.01), respectively, and to 56 and 54% after 5 days of treatment (p less than 0.01). In contrast, antithrombin III decreased progressively 25% during 5 days of heparin treatment. Protein C antigen and activity and total protein S remained unchanged during heparin treatment. Free protein S was decreased before heparin treatment (83%, p less than 0.05) and increased to normal values after 5 days of treatment. C4b-binding protein was significantly increased before and during heparin treatment (p less than 0.01). Activated protein C (APC) complexed to its two major plasma inhibitors, PCI and alpha 1-antitrypsin (alpha 1AT) were measured by specific ELISA's. Before treatment, 18 of the 19 patients studied had increased levels of APC:alpha 1AT complexes with a mean value of 27 +/- 22 ng/ml (range, 6-86 ng/ml) compared to normal values (8 +/- 2 ng/ml) and 12 of the patients also had detectable APC:PCI complex levels with a mean value of 11 +/- 17 ng/ml (range, 5-68 ng/ml). Both APC:inhibitor complexes decreased significantly during heparin treatment.[1]

References

  1. Protein C inhibitor and other components of the protein C pathway in patients with acute deep vein thrombosis during heparin treatment. Tabernero, D., España, F., Vicente, V., Estellés, A., Gilabert, J., Aznar, J. Thromb. Haemost. (1990) [Pubmed]
 
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