BackgroundIgE causes anaphylaxis in type I hypersensitivity diseases by activating degranulation of effector cells such as mast and basophils. The mechanisms that control IgE activity prevent under normal conditions are still enigmatic.ObjectiveWe aimed to unravel how anti-IgE autoantibodies induced we understand their role regulating serum level allergic anaphylaxis.MethodsWe immunized mice wi...

Data have been collected from 47 centers in Europe and North America on the treatment with porcine factor VIII concentrate of 74 acute bleeding episodes in 65 patients with acquired hemophilia. The median initial anti-human factor VIII auto-antibody inhibitor level was 38 Bethesda unit (BU)/mL (range 1.2 to 1,024) whereas that against porcine was 1 BU/mL (range 0 to 15). The mean initial dose o...

IL-4-dependent and -independent IgG1 Abs differ in their ability to induce mast cell degranulation as measured by passive cutaneous anaphylaxis (PCA). Mice immunized with OVA or PIII (fraction of Ascaris suum) produced high titers of IgG1 as shown by ELISA and PCA. In contrast, another A. suum fraction, PI, elicited IgG1 Abs with no PCA activity. IgG1 with anaphylactic activity required IL-4, a...