Characterization of anti-factor VIII antibody in a patient with acquired hemophilia A
Blood Research
;
: 58-62, 2013.
Article
in English
| WPRIM
| ID: wpr-132571
ABSTRACT
Acquired hemophilia A (AHA) is a bleeding disorder caused by the development of an auto-antibody against endogenous factor VIII (FVIII). In this study, the epitope of the autoantibody was identified in a 67-year-old female patient with AHA. A prolonged activated partial thromboplastin time (77.4 s) that failed to correct in an incubation mixing test (68.2 s), a decreased FVIII activity, and a high FVIII inhibitor (14.6 Bethesda units/mL) were observed. Enzyme-linked immunosorbent assay demonstrated that the antibody belonged to the immunoglobulin G4 subclass. An immunoblotting assay revealed the light chain (A3/C1/C2 domain) of FVIII as the binding region of the antibody. The bleeding experienced by our patient resulted from the interference of FVIII binding to both FIX by anti-A3 antibodies and phospholipids and von Willebrand factor by anti-C2 antibodies. To the best of our knowledge, this is the first study in Korea characterizing an autoantibody in the context of AHA.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Partial Thromboplastin Time
/
Phospholipids
/
Factor VIII
/
Immunoglobulins
/
Von Willebrand Factor
/
Enzyme-Linked Immunosorbent Assay
/
Immunoblotting
/
Hemophilia A
/
Hemorrhage
/
Korea
Type of study:
Prognostic study
Limits:
Female
/
Humans
Country/Region as subject:
Asia
Language:
English
Journal:
Blood Research
Year:
2013
Type:
Article
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