title: Immune deficiency in the X-linked lymphoproliferative syndrome. II. Immunoregulatory T cell defects.
abstract: Surface phenotypic markers and the function of lymphocytes in patients affected with the X-linked lymphoproliferative syndrome (XLP) were studied. This syndrome is characterized by a defective response to infection with Epstein Barr virus (EBV). Normal numbers of B and T cells were detected with anti-Ig and monoclonal OKT3 antisera, respectively. T cell subset values, however, were persistently altered: cells reacting with OKT8 were significantly elevated in five of nine patients, accompanied by a slight decrease in the percentage of OKT4-positive cells, leading to abnormally low OKT4 to OKT8 ratios. One patient had a high OKT4 to OKT8 ratio due to low number of OKT8-positive cells. Lymphocytes from patients showed normal proliferation after stimulation with T and B cell mitogens. In contrast, Ig synthesis by lymphocytes after stimulation with B cell mitogens was markedly deficient: low or undetectable levels of one or all classes of Ig were detected, whereas cell lines established from EBV-infected B lymphocytes from patients produced normal quantities of Ig. These studies imply immune regulatory impairments in the patient with XLP.
mesh_terms: D000911:Antibodies, Monoclonal; D000917:Antibody Formation; D000954:Antigens, Surface / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology; D002478:Cells, Cultured; D005260:Female; D004854:Herpesvirus 4, Human / Q000276:immunology; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000276:immunology*; D008213:Lymphocyte Activation; D008232:Lymphoproliferative Disorders / Q000235:genetics / Q000276:immunology*; D008297:Male; D008934:Mitogens; D013601:T-Lymphocytes / Q000276:immunology*; D014960:X Chromosome
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D008934:Mitogens