title: In vitro production of interleukin 1 by normal and malignant human B lymphocytes.
abstract: In this study, the capacity of normal and neoplastic B lymphocytes to release interleukin 1 (IL 1) has been investigated. Peripheral blood B cells from normal donors were isolated by depletion of E rosetting cells and by positive selection of cells expressing surface immunoglobulin (sIg) or the B1 marker. Peripheral blood B cells from patients with B cell chronic lymphocytic leukemia (B-CLL) were purified by removal of E rosetting cells followed by complement-mediated cytotoxicity with selected monoclonal antibodies. All of the normal B cell suspensions and the large majority of the B-CLL cells produced in culture high amounts of IL 1 in the absence of any apparent stimulus. Control experiments ruled out that small numbers of monocytes in the B cell suspensions could represent the source of IL 1. These data support the contention that B cells participate to the immune response as accessory cells for T cell activation not only by physically presenting antigen, but also by releasing IL 1.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism*; D002448:Cell Adhesion; D002469:Cell Separation / Q000379:methods; D003165:Complement System Proteins; D006801:Humans; D007375:Interleukin-1 / Q000096:biosynthesis* / Q000302:isolation & purification; D007945:Leukemia, Lymphoid / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D008809:Mice, Inbred C3H; D012397:Rosette Formation
chemical_list: D000911:Antibodies, Monoclonal; D007375:Interleukin-1; D003165:Complement System Proteins