title: Production of interleukin 1 activity by normal human peripheral blood B lymphocytes.
abstract: Interleukin 1 (IL 1) production by normal human B lymphocytes was investigated. Normal human peripheral blood B lymphocytes were purified by sequential separation with the use of Ficoll-Hypaque gradient centrifugation, sheep red blood cell rosette formation, Percoll gradients, and treatment with monoclonal antibodies (anti-Leu-M1, B73.1, and T101) and complement. Both purified large B lymphocytes (BL) and small B lymphocytes (BS) produced IL 1-like (thymocyte co-mitogenic and fibroblast mitogenic) activities in response to lipopolysaccharide. Maximal production of IL 1 activity by both BL and BS occurred at 48 hr. The m.w. of IL 1 activities from both BL and BS were about 20,000 with high pressure liquid chromatography, and the major isoelectric point of BL- and BS-derived IL 1 activity was 7.0. A rabbit anti-human monocyte IL 1 antiserum inhibited the activity of B cell-derived IL 1, suggesting antigenic similarities of monocyte- and B lymphocyte-derived IL 1 moieties. These data suggest that normal B lymphocyte-derived IL 1 activity is biochemically and immunologically similar to monocyte-derived IL 1.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000145:classification / Q000276:immunology / Q000378:metabolism*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003429:Cross Reactions; D005260:Female; D006801:Humans; D007375:Interleukin-1 / Q000032:analysis / Q000096:biosynthesis*; D007700:Kinetics; D008070:Lipopolysaccharides / Q000494:pharmacology; D008213:Lymphocyte Activation; D051379:Mice; D008809:Mice, Inbred C3H; D009000:Monocytes / Q000378:metabolism
chemical_list: D007375:Interleukin-1; D008070:Lipopolysaccharides