title: Phenotypically immature IgG-bearing B cells in patients with hypogammaglobulinemia.
abstract: We investigated the prevalence of phenotypically immature IgG B cells (i.e., coexpressing surface IgG and IgM) in the peripheral blood of 12 patients with hypogammaglobulinemia and in normal individuals. Patients had ataxia-telangiectasia (N = 1), hyper-IgM combined immunodeficiency (N = 1), or common variable immunodeficiency (CVI). IgG/IgM-positive B cells were evaluated by two-color immunofluorescence using fluorescein- or rhodamine-conjugated goat antiserum; to minimize artifacts due to in vivo cytophilic binding of autologous IgG, cell-bound cytophilic Ig were eluted at pH 4 and Fc receptors were blocked by heat-aggregated rabbit IgG before fluorescent staining. All patients, except two with late-onset CVI, had markedly increased proportions of double-stained IgG B cells (56 to 100% of IgG-bearing B cells) in comparison with normal individuals (11 to 33%).
mesh_terms: D000328:Adult; D000361:Agammaglobulinemia / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002648:Child; D005260:Female; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis / Q000235:genetics*; D007075:Immunoglobulin M / Q000032:analysis; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M