Fig. 5.
Competitive inhibition of the binding to FVIII between natural anti-FVIII IgG from IVIg and FVIII inhibitors from patients.
Radiolabeled anti-FVIII IgG alloantibody of a high-responder hemophiliac (A) and anti-FVIII IgG autoantibody of an autoimmune patient (B) (3 μg/mL) were incubated with increasing concentrations of anti-FVIII IgG from IVIg (closed squares), unfractionated IVIg (open squares), and IVIg depleted of anti-FVIII antibodies (open triangles) for 4 hours at 37°C. The percentage of inhibition was calculated as described in “Patients and methods.”