Inhibition of interleukin 2 receptor expression in normal human T cells by cyclosporine. Demonstration at the mRNA, protein, and functional levels.
In view of the importance of the IL-2 receptors in the expression of antiallograft immunity and the currently existing controversy regarding the effect of CsA on the induction of IL-2 receptors, we explored the effect of cyclosporine on the induction of interleukin-2 receptor alpha and beta in normal human T cells. The effect of CsA on the induction of IL-2 receptors was examined at the levels of mRNA expression (with the aid of the polymerase chain reaction), protein (by SDS-PAGE analysis of chemically crosslinked 125I-IL-2 membrane protein complexes and by FACS), and function (by Scatchard analysis of 125I-IL-2 binding to T cells). The T cells were signaled with sn-1,2-dioctanoylglycerol and ionomycin or with crosslinked anti-CD3 and anti-CD2 mAbs. Our experimental design revealed that (A) CsA inhibits the induction of IL-2 receptor alpha and beta in normal human T cells, (B) the inhibitory activity is realized by a direct effect on T cells, and (C) the inhibitory activity is detectable at the pretranslational level--CsA significantly reduced the induction of mRNA encoding IL-2 receptor alpha and IL-2 receptor beta. These observations together persuasively demonstrate the ability of CsA to interrupt the emergence of IL-2 receptors on the surface of normal human T cells.
Iris and B. Gerald Canter Laboratory for Immunological Research in Diabetes, Rogosin Institute, New York, New York 10021.
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Li
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Sehajpal
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Subramaniam
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Joseph
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Stenzel
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Suthanthiran
D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D018801:CD2 Antigens; D017252:CD3 Complex; D002478:Cells, Cultured; D016572:Cyclosporine / Q000494:pharmacology*; D004075:Diglycerides / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D007376:Interleukin-2 / Q000378:metabolism; D015759:Ionomycin / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis*; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D011971:Receptors, Immunologic / Q000276:immunology; D015375:Receptors, Interleukin-2 / Q000096:biosynthesis / Q000187:drug effects* / Q000235:genetics; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology*
D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D018801:CD2 Antigens; D017252:CD3 Complex; D004075:Diglycerides; D007376:Interleukin-2; D012333:RNA, Messenger; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D015759:Ionomycin; D016572:Cyclosporine