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| Content Provider | PubMed Central |
|---|---|
| Author | Weinstein, M. Chute, L. Deykin, D. |
| Abstract | The relationship between Factor VIII coagulant antigen (VIII:CAg) and Factor VIII-associated von Willebrand factor (VIII:vWF), and the effect of thrombin on VIII:CAg have been determined in plasma by using complexes of VIII:CAg and 125I-labeled human anti-VIII:CAg-Fab. Antibody-treated plasma samples were electrophoresed on NaDodSO4/polyacrylamide agarose gels and analyzed by autoradiography. The major VIII:CAg-125I-labeled Fab complex that persisted in NaDodSO4 had Mr 3.2 x 10(5). This Mr value was confirmed by column chromatography and sucrose density centrifugation and is presumed to reflect a free VIII:CAg of Mr 2.7 x 10(5). Minor bands were also present on autoradiograms of normal plasma corresponding to Mr values of 2.5, 1.85, and 1.7 x 10(5) (free VIII:CAg related proteins with Mr values of 2.0, 1.35, and 1.2 x 10(5), respectively). None of the VIII:CAg bands was present in plasma samples from five patients with severe hemophilia A. No radioactivity was associated with VIII:vWF multimers on NaDodSO4 gels. Thrombin treatment of normal plasma eliminated the radioactive band at 3.2 x 10(5) and increased the intensity of a band of Mr 1.7 x 10(5). Generation of this presumed VIII:CAg fragment of Mr is approximately equal to 1.2 x 10(5) coincided with a thrombin-induced increase in Factor VIII coagulant activity. These data demonstrate that the form of VIII:CAg detected in normal plasma is not covalently linked to VIII:vWF multimers and is absent in plasma from five hemophilia A patients. Thrombin-induced proteolysis of VIII:CAg can be detected in microliter quantities of normal plasma. |
| Starting Page | 5137 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 78 |
| Language | English |
| Publisher Date | 1981-08-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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