Demonstration and mode of action of an inhibitor for activated Hageman factor (factor XIIa) of the intrinsic blood coagulation pathway from Schistosoma mansoni.

Abstract:

:An anticoagulant activity from adult Schistosoma mansoni whole worm homogenate is described. The inhibitor appears to be specific for the contact activation step of the intrinsic pathway. Experiments with both human and mouse plasmas have defined the specificity of the inhibitor as follows: (1) It lengthens the partial thromboplastin time of normal plasma. (2) It has no effect on the prothombin time and Russell's viper venom time of normal plasma. (3) Preactivation of normal plasma by a contact activator such as Celite eliminates essentially all inhibitory activity. (4) The inhibitor appears to be heat stable and can be precipitated by centrifugation above 27,000 g. (5) The inhibitor has no effect on the activation of factor XII by Celite. (6) The activation of factor XI by factor XIIa, however, is inhibited by the schistosomal inhibitor. The above data are consistent with the view that S. mansoni adults possess an anticoagulant that is capable of specifically inhibiting the conversion of factor XI to factor XIa by factor XIIa.

journal_name

Blood

journal_title

Blood

authors

Tsang VC,Damian RT

subject

Has Abstract

pub_date

1977-04-01 00:00:00

pages

619-33

issue

4

eissn

0006-4971

issn

1528-0020

journal_volume

49

pub_type

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