title: Evidence of the direct interaction between spontaneously occurring anti-factor VIII autoantibody and intravenous immunoglobulin.
abstract: A previously normal female (39-year-old) who developed anti-factor VIII autoantibodies experienced massive and prolonged bleeding after the emergency operation for intramuscular hemorrhage in her left calf. Administration of high-dose intravenous immunoglobulin, 400 mg/kg for 5 consecutive days, decreased the antibody titer from 115 Bethesda units/ml (B U/ml) to 17 B U on the third day after the treatment. However, it again returned spontaneously to the original level there-after. In vitro studies using plasma from the patient were done to investigate the role of intravenous immunoglobulin. The autoantibody bound to an affinity column (intravenous immunoglobulin coupled CN-Br Sepharose 4B) and was eluted as a single peak. These results suggested that intravenous immunoglobulin directly interacted with auto-factor VIII antibody. This interaction might be involved in the in vivo decrease of antibody titer.
authors.forename: Y
authors.initials: Y
authors.lastname: Nishida
authors.forename: N
authors.initials: N
authors.lastname: Sakiyama
authors.forename: E
authors.initials: E
authors.lastname: Kakishita
authors.forename: K
authors.initials: K
authors.lastname: Nagai
mesh_terms: D000328:Adult; D001323:Autoantibodies / Q000276:immunology*; D005169:Factor VIII / Q000276:immunology*; D005260:Female; D006467:Hemophilia A / Q000628:therapy; D006801:Humans; D007116:Immunization, Passive; D007136:Immunoglobulins / Q000008:administration & dosage* / Q000276:immunology; D007275:Injections, Intravenous
chemical_list: D001323:Autoantibodies; D007136:Immunoglobulins; D005169:Factor VIII