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Soluble interleukin 2 receptors released from mitogen stimulated human peripheral blood lymphocytes bind interleukin 2 and inhibit IL2 dependent cell proliferation. 1989

R K Chopra, and D C Powers, and N E Kendig, and W H Adler, and J E Nagel
Clinical Immunology Section, National Institute on Aging, Baltimore, MD 21224.

In this communication the binding characteristics and possible regulatory role of sIL2R were investigated. Soluble IL2R are released or secreted in high concentrations by phytohemagglutinin (PHA) stimulated human lymphoid cells. The addition of sIL2R, purified by gel filtration chromatography, to cultures of PHA stimulated lymphoblasts resulted in a dose-dependent inhibition of [3H]TdR incorporation that could be overcome by the addition of exogenous IL2. Scatchard analysis of IL2 binding demonstrated that the presence of sIL2R did not inhibit ligand interaction with the high affinity IL2R. Immunoprecipitation studies utilizing [125I]IL2 and the non-inhibitory anti-Tac protein antibody 7G7/B6 revealed that most of the 125I-labeled IL2 migrated with a protein of approximately 45-50 kDa on SDS/PAGE. Together, these results provide evidence that the sIL2R limits the availability of free IL2 to proliferating cells and down-regulates their response without directly affecting the number or function of the cell bound high affinity IL2R.

UI MeSH Term Description Entries
D007376 Interleukin-2 A soluble substance elaborated by antigen- or mitogen-stimulated T-LYMPHOCYTES which induces DNA synthesis in naive lymphocytes. IL-2,Lymphocyte Mitogenic Factor,T-Cell Growth Factor,TCGF,IL2,Interleukin II,Interleukine 2,RU 49637,RU-49637,Ro-23-6019,Ro-236019,T-Cell Stimulating Factor,Thymocyte Stimulating Factor,Interleukin 2,Mitogenic Factor, Lymphocyte,RU49637,Ro 23 6019,Ro 236019,Ro236019,T Cell Growth Factor,T Cell Stimulating Factor
D007700 Kinetics The rate dynamics in chemical or physical systems.
D008213 Lymphocyte Activation Morphologic alteration of small B LYMPHOCYTES or T LYMPHOCYTES in culture into large blast-like cells able to synthesize DNA and RNA and to divide mitotically. It is induced by INTERLEUKINS; MITOGENS such as PHYTOHEMAGGLUTININS, and by specific ANTIGENS. It may also occur in vivo as in GRAFT REJECTION. Blast Transformation,Blastogenesis,Lymphoblast Transformation,Lymphocyte Stimulation,Lymphocyte Transformation,Transformation, Blast,Transformation, Lymphoblast,Transformation, Lymphocyte,Activation, Lymphocyte,Stimulation, Lymphocyte
D011485 Protein Binding The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments. Plasma Protein Binding Capacity,Binding, Protein
D002455 Cell Division The fission of a CELL. It includes CYTOKINESIS, when the CYTOPLASM of a cell is divided, and CELL NUCLEUS DIVISION. M Phase,Cell Division Phase,Cell Divisions,Division Phase, Cell,Division, Cell,Divisions, Cell,M Phases,Phase, Cell Division,Phase, M,Phases, M
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D015375 Receptors, Interleukin-2 Receptors present on activated T-LYMPHOCYTES and B-LYMPHOCYTES that are specific for INTERLEUKIN-2 and play an important role in LYMPHOCYTE ACTIVATION. They are heterotrimeric proteins consisting of the INTERLEUKIN-2 RECEPTOR ALPHA SUBUNIT, the INTERLEUKIN-2 RECEPTOR BETA SUBUNIT, and the INTERLEUKIN RECEPTOR COMMON GAMMA-CHAIN. IL-2 Receptors,Interleukin-2 Receptor,Interleukin-2 Receptors,Receptors, IL-2,Receptors, T-Cell Growth Factor,T-Cell Growth Factor Receptors,IL-2 Receptor,IL2 Receptor,IL2 Receptors,Interleukin 2 Receptor,Receptor, TCGF,T-Cell Growth Factor Receptor,TCGF Receptor,TCGF Receptors,IL 2 Receptor,IL 2 Receptors,Interleukin 2 Receptors,Receptor, IL-2,Receptor, IL2,Receptor, Interleukin 2,Receptor, Interleukin-2,Receptors, IL 2,Receptors, IL2,Receptors, Interleukin 2,Receptors, T Cell Growth Factor,Receptors, TCGF,T Cell Growth Factor Receptor,T Cell Growth Factor Receptors

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