title: Humoral immunodeficiency in T-cell chronic lymphocytic leukemia. An immunologic assessment.
abstract: The humoral antibody immunodeficiency in two patients with T-cell chronic lymphocytic leukemia (T-CLL) appeared to be the result of immunoregulatory abnormalities in the leukemic T-cell populations. Both patients had CD4+ CD45R+ "virgin" or suppressor-inducer T-CLL, but Patient 1 had hypogammaglobulinemia and Patient 2, immunoglobulin (Ig) M hypergammaglobulinemia. Although, CD25+ interleukin-2 (IL-2) receptors were present on leukemic T-cells of both patient, OKT9+ (CD71) transferrin receptors and OKT10 (CD38) activation antigens were found only on Patient 2's cells. Highly elevated amounts of IL-2 was secreted from phytohemagglutinin-stimulated and concanavalin A-stimulated T-cells in both patients. In Patient 1 with hypogammaglobulinemia, immune defects involve T-cells, first an intense suppressor activity on B-cell-induced IgM and IgG synthesis and, second, deficient production of B-cell growth factor (BCGF) and B-cell differentiation factor (BCDF). In Patient 2, highly elevated BCGF and IgM-specific BCDF was secreted by T-cells, a mechanism leading to IgM hypergammaglobulinemia in this patient. These studies stress the importance of BCGF and BCDF activity of leukemic T-cells in humoral antibody immunodeficiency disorders in T-CLL cases.
authors.affiliation: Department of Clinical Immunology, King Saud University, College of Medicine, Abha, Saudi Arabia.
authors.forename: S
authors.initials: S
authors.lastname: Raziuddin
authors.forename: A
authors.initials: A
authors.lastname: Sheikha
authors.forename: B
authors.initials: B
authors.lastname: Teklu
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000917:Antibody Formation; D000954:Antigens, Surface / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology; D003208:Concanavalin A; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007376:Interleukin-2 / Q000378:metabolism; D015461:Leukemia, Prolymphocytic, T-Cell / Q000276:immunology*; D008297:Male; D010641:Phenotype; D010835:Phytohemagglutinins; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000954:Antigens, Surface; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007376:Interleukin-2; D010835:Phytohemagglutinins; D003208:Concanavalin A