[Additive activity of IgE and IgGa anaphylactic antibodies in rats (author's transl)].

Anaphylactic antibodies of two different classes are produced in rats: IgE and IgGa. When injected into the skin of normal animals, IgE remains at the site of injection for two weeks or more, while IgGa diffuses out within hours. In order to determine whether the anaphylactic reaction produced by one class of antibody is modified by the simultaneous presence of the other class of antibody, sites were prepared in normal rats with IgE antibody and 24 hours later IgGa antibody was injected into the same sites. The passive cutaneous anaphylactic reactions was elicited 2 hours later by intravenous challenge with an excess of antigen. The results indicated that both antibodies acted in an additive way. No inhibition or potentiation was observed.