title: Preliminary characterization of a soluble immunosuppressive molecule from DBA/2 spleen cells using monoclonal antibody immunoadsorbence.
abstract: In a previous publication a monoclonal antibody (B16G) which appeared to recognize T suppressor cells and a T-suppressor factor (TsF) in the spleens of DBA/2 mice was described. B16G appears to be directed to a public specificity of DBA/2 TsF and therefore has been shown to inhibit a variety of immunological reactions. The present study involves preliminary characterization of the material with which B16G reacts. It was found that the B16G-reactive protein (putative TsF) could be absorbed and eluted specifically from a B16G immunoadsorbent column. Material eluting from the B16G column reacted with B16G in an ELISA and appeared to run as two or more bands of 40-45 kDa in sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The eluted material was biologically active (i.e., suppressive) in the standard assay (mixed leukocyte reaction of DBA/2 splenocytes with B10.BR targets), and its suppressive activity was abrogated by the addition of B16G to the mixed leukocyte reaction cultures. Sephadex G-150 chromatography of the B16G-reactive material showed that under these conditions, its native molecular mass was between 80-90 kDa, indicating that it might occur as a dimer under natural conditions.
authors.forename: J K
authors.initials: JK
authors.lastname: Steele
authors.forename: A T
authors.initials: AT
authors.lastname: Stammers
authors.forename: A
authors.initials: A
authors.lastname: Chan
authors.forename: T
authors.initials: T
authors.lastname: Maier
authors.forename: J G
authors.initials: JG
authors.lastname: Levy
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000941:Antigens / Q000276:immunology; D002846:Chromatography, Affinity; D004797:Enzyme-Linked Immunosorbent Assay; D007163:Immunosorbent Techniques; D007959:Lymphocyte Culture Test, Mixed; D008222:Lymphokines / Q000276:immunology* / Q000302:isolation & purification; D051379:Mice; D008811:Mice, Inbred DBA / Q000276:immunology; D013154:Spleen / Q000032:analysis; D013491:Suppressor Factors, Immunologic; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000941:Antigens; D008222:Lymphokines; D013491:Suppressor Factors, Immunologic