Neutralization of heparin by prothrombin activation products

Pieters, J. and Franssen, J. and Visch, C. and Lindhout, T.. (1987) Neutralization of heparin by prothrombin activation products. Thrombosis Research, Vol. 45, H. 5. pp. 573-580.

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Official URL: http://edoc.unibas.ch/dok/A5259443

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The neutralization of heparin by active site blocked meizothrombin and thrombin, prothrombin fragment 1.2, fragment 1 and fragment 2 was probed by the heparin-dependent factor Xa inactivation by antithrombin III (AT III). Meizothrombin had no effect on the inactivation of factor Xa, whereas thrombin had an inhibitory effect (IC50 = 700 nM). After factor Xa catalyzed cleavage of meizothrombin, the resulting products, prothrombin fragment 1.2 plus thrombin, did not show any heparin neutralizing properties. However, after isolation of the reaction products, both thrombin and prothrombin fragment 1.2 exhibited heparin neutralizing properties in the factor Xa inactivation reaction. The IC50-values were 700 nM and 100 nM, respectively. Prothrombin fragment 1, when present at 125 nM, caused a 50% reduction of the heparin-dependent rate of inactivation of factor Xa and prothrombin fragment 2 had no effect at all. From this we conclude that, in addition to the thrombin part of the prothrombin molecule, the fragment 1 region also exhibits a rather high affinity for heparin.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Infection Biology > Biochemistry (Pieters)
UniBasel Contributors:Pieters, Jean
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Pergamon Press
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:22
Deposited On:22 Mar 2012 13:30

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