منابع مشابه
Factor XI messenger RNA in human platelets.
The bleeding diathesis associated with congenital deficiency of factor XI (FXI) is variable and correlates poorly with standard coagulation assays. Platelets are reported to contain FXI activity that may substitute for the plasma protein. The presence of this platelet activity in some patients deficient in plasma FXI could partly explain the variable bleeding associated with the deficiency stat...
متن کاملHuman platelets synthesize and express functional tissue factor.
The source and significance of bloodborne tissue factor (TF) are controversial. TF mRNA, protein, and TF-dependent procoagulant activity (PCA) have been detected in human platelets, but direct evidence of TF synthesis is missing. Nonstimulated monocyte-free platelets from most patients expressed TF mRNA, which was enhanced or induced in all of them after platelet activation. Immunoprecipitation...
متن کاملFactor XI antigen and activity in human platelets.
Washed platelets, contaminated with less than 0.20% plasma factor XI, were examined for the presence of factor XI antigen and activity. These platelets contained a factor-XI-like coagulant activity (0.67 +/- 0.11 U/10(11) platelets) that remained constant after successive washes. By means of indirect immunofluorescence, a monospecific antibody to factor XI showed specific staining of both norma...
متن کاملDefective binding of factor XI-N248 to activated human platelets.
Variants of factor XI containing Gln226 to Arg (Q226 to R) and Ser248 to Asn (S248 to N) substitutions were first identified in an African American family with a history of excessive bleeding. The substitutions have recently been identified in unrelated individuals, suggesting they are relatively common. Both amino acids are located in the third apple domain of factor XI, an area implicated in ...
متن کاملHuman platelets and factor XI. Localization in platelet membranes of factor XI-like activity and its functional distinction from plasma factor XI.
Because human platelets participate in the contact phase of intrinsic coagulation and contain a Factor XI-like coagulant activity, the nature of the Factor XI-like activity was examined and compared with purified plasma Factor XI. The platelet factor XI-like activity was sedimented with the particulate fraction of a platelet lysate, was inactivated by heat (t(1/2) 3.5 min, 56 degrees C), was no...
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ژورنال
عنوان ژورنال: Journal of Thrombosis and Haemostasis
سال: 2004
ISSN: 1538-7933,1538-7836
DOI: 10.1111/j.1538-7836.2004.00935.x