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Regulation of interleukin 2 receptor expression: effects of phorbol diester, phospholipase C, and reexposure to lectin or antigen

, : Regulation of interleukin 2 receptor expression: effects of phorbol diester, phospholipase C, and reexposure to lectin or antigen. Journal of Immunology 133(6): 3054-3061

Anti-Tac monoclonal antibody identifies the receptor for interleukin 2 (IL 2, or T cell growth factor) present on activated human T lymphocytes. By using tritiated anti-Tac, a sensitive and specific binding assay to evaluate cell surface IL 2 receptor expression is reported. IL 2 receptors on human peripheral blood lymphocytes can be detected within 6 h after PHA [phytohemagglutination] stimulation. PHA-induced receptor expression is inhibited by actinomycin D and cycloheximide, but not by mitomycin C, suggesting a requirement for de novo RNA and protein synthesis, but not DNA synthesis. Scatchard analysis of [3H]-anti-Tac binding to lymphocytes stimulated with PHA for 3 days revealed from 20,000 to 60,000 molecules of antibody bound per cell, and a Kd of 1-3 .times. 10-10 mol/1. Sequential binding studies of activated human lymphocytes maintained in long-term culture with IL 2 demonstrated a progressive decline in receptor number correlating with diminished growth rate. Restimulation with lectin or antigen increased the number of IL 2 receptors, suggesting that IL 2 dependent immune responses may be regulated, at least in part, by IL 2 receptor expression. Receptor number was also increased by PMA [phorbol myristate acetate]. Similar effects were produced by incubation with phospholipase C but not interleukin 1. Because both PMA and phospholipase C result in activation of protein kinase C, these data suggest the possibility that activation of protein kinase C may induce IL 2 receptor expression.

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Accession: 006288805

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