title: [Severe aplastic anemia accompanied with abnormality of T cell subset and appearance of anti-BI antibody].
abstract: A 66-year-old female was diagnosed to have severe aplastic anemia. Remission was not achieved by the ALG-oxymethorone therapy, and she was in need of RBC multitransfusion. After receiving a total of 42 units (16,800 ml) of red blood cells, it was found that her serum agglutinated strongly her own group BI cells at 4 degrees C. This agglutination disappeared in DTT solution. An eluate from her red cells also agglutinated BI panel cells, whereas Bi, O I, O i cells failed to react. It was apparent that the cold agglutinin in her serum had special affinity for I cells, which also contain B. Analysis of lymphocyte subset in peripheral blood showed T 3 (CD 3) 70.18%, T 4 (CD 4) 70.92%, T 8 (CD 8) 7.08%, T 4/T 8 = 10.1, T4 (+)2H4(+)/T4(+)2H4(-) = 1.05. Although relationship between appearance of anti-BI antibody and relative increment of CD 4 positive cells was not clear, we considered that these findings were caused by an abnormal autoimmune reaction in the patient with aplastic anemia.
authors.forename: T
authors.initials: T
authors.lastname: Inada
authors.forename: K
authors.initials: K
authors.lastname: Abe
authors.forename: N
authors.initials: N
authors.lastname: Imamura
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.forename: A
authors.initials: A
authors.lastname: Kuramoto
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D000368:Aged; D000741:Anemia, Aplastic / Q000276:immunology*; D001323:Autoantibodies / Q000032:analysis*; D001789:Blood Group Antigens / Q000276:immunology*; D005260:Female; D006801:Humans; D007048:I Blood-Group System / Q000276:immunology*; D007958:Leukocyte Count; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000017:ABO Blood-Group System; D001323:Autoantibodies; D001789:Blood Group Antigens; D007048:I Blood-Group System