[IgG subclasses of warm red cell autoantibodies in autoimmune hemolytic anemia].
IgG subclasses (G-sub) of warm red cell autoantibodies (anti-Rs) were examined by means of antiglobulin test (DAT) using anti-IgG1, 2, 3, and IgG4 sera (Holland Red Cross) on 12 AIHA, and on 5 cases being DAT positive caused by alpha-methyldopa (alpha MD). In 4 of 5 AIHA cases complicating SLE, the anti-Rs comprised not only IgG, but also IgA, IgM and C3; their G-sub were IgG1 + 2 in 2 and IgG1 + 2 + 3 + 4 in the other 2. In all of the 3 cases with idiopathic AIHA, anti-Rs comprised IgG alone (IgG1 alone, IgG1 + 3 or IgG1 + 2 + 3 in each one). All of the 5 alpha MD induced anti-Rs comprised IgG1 alone. Observation of the course of AIHA revealed that, although IgG3 tended to correlate with their anemia, this trend was not universal. Besides, the G-sub were not related to the anti-Rs titers. Furthermore, the immunological aberrations in patients with AIHA + SLE were found to be more complicated.
Okubo
S
S
Blood Transfusion Unit of Kansai Medical University, Osaka.
Ishida
T
T
Yasunaga
K
K
D000744:Anemia, Hemolytic, Autoimmune / Q000276:immunology*; D001323:Autoantibodies / Q000378:metabolism*; D004912:Erythrocytes / Q000276:immunology*; D006358:Hot Temperature; D006801:Humans; D007074:Immunoglobulin G / Q000145:classification / Q000378:metabolism*
D001323:Autoantibodies; D007074:Immunoglobulin G