title: T lymphocyte subpopulations and Ia-positive T cells in patients with immunodeficiency.
abstract: T lymphocyte subpopulations (T gamma and Tmu) were studied in a group of 36 adult patients with immunodeficiency. Proportions and numbers of Ia(+) T cells were also studied in comparison to 46 normal adult controls. Values for per cent and total numbers of T gamma and Tmu cells indicated no uniform abnormality. Mean normal percentage of Ia(+) T cells was 2.4% whereas 16 to 29 immunodeficient patients showed elevated proportions and absolute numbers of Ia(+) T cells. Striking fluctuation in proportions of Ia(+) T cells was noted in serial studies of five immunodeficient subjects in contrast to similar analyses of normal controls. A correlation (P less than 0.01) was recorded between absolute numbers of Ia(+) T cells in immune deficiency patients and numbers of T mu cells. Depletion of T gamma cells by EA rosetting in patients with late-onset primary acquired hypogammaglobulinaemia did not result in significant change in IgG or IgM synthesis with T gamma-depleted T cells were co-cultured with normal B cells. Depletion of Ia(+) T cells likewise did not significantly influence Ig synthesis in co-culture with normal or immune-deficient B cells. These studies emphasize the complexity of defects present among any large group of patients with immune deficiency.
mesh_terms: D000328:Adult; D001402:B-Lymphocytes / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D007075:Immunoglobulin M / Q000276:immunology; D007136:Immunoglobulins / Q000096:biosynthesis; D007153:Immunologic Deficiency Syndromes / Q000276:immunology*; D007223:Infant; D011961:Receptors, Fc / Q000032:analysis; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000145:classification* / Q000276:immunology
chemical_list: D000949:Histocompatibility Antigens Class II; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins; D011961:Receptors, Fc