title: Cellular source of soluble interleukin 2 receptors in serum of mice after recombinant interleukin 2 administration.
abstract: Previous studies have shown that peripheral blood mononuclear cells activated in vitro not only express cell-associated interleukin 2 receptors (IL2R) but also release a soluble form of this receptor. In this study, we demonstrate that administration of human recombinant IL 2 (rIL 2) to mice results in increased spleen weights, splenic natural killer (NK) cell cytolytic activity, and serum levels of soluble IL2R. However, compared with rIL 2-treated heterozygote controls, beige mice treated with rIL 2 displayed similar elevations in serum soluble IL2R but significantly less splenic NK activity. Likewise, administration of anti-asialo GM1 antiserum to rIL 2-treated mice resulted in a dramatic reduction in splenic NK cytolytic activity, but no reduction in serum soluble IL2R. Conversely, while rIL 2 treatment of BALB/c mice produced increased splenic NK activity and serum soluble IL2R, similar treatment of BALB/c nude mice resulted in elevation of only splenic NK activity. These studies demonstrate that administration of rIL 2 to normal mice can elevate both serum IL2R levels and splenic NK cytolytic activity. However, the results suggest that T cells are likely to be the source of elevated serum IL2R after rIL 2 administration.
authors.affiliation: Metabolism Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.
authors.forename: D K
authors.initials: DK
authors.lastname: Wagner
authors.forename: H L
authors.initials: HL
authors.lastname: Wong
authors.forename: M K
authors.initials: MK
authors.lastname: Gately
authors.forename: D L
authors.initials: DL
authors.lastname: Nelson
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000187:drug effects*; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000032:analysis; D005677:G(M1) Ganglioside; D006028:Glycosphingolipids / Q000276:immunology; D007376:Interleukin-2 / Q000494:pharmacology*; D007694:Killer Cells, Natural / Q000187:drug effects / Q000276:immunology*; D051379:Mice; D008815:Mice, Inbred Strains; D008819:Mice, Nude; D009929:Organ Size; D015375:Receptors, Interleukin-2 / Q000032:analysis / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000494:pharmacology; D013154:Spleen / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006028:Glycosphingolipids; D007376:Interleukin-2; D015375:Receptors, Interleukin-2; D011994:Recombinant Proteins; D005677:G(M1) Ganglioside; C018835:asialo GM1 ganglioside