IL-2 negatively regulates IL-7 receptor alpha chain expression in activated T lymphocytes |
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| Authors: | Xue Hai-Hui Kovanen Panu E Pise-Masison Cynthia A Berg Maria Radovich Michael F Brady John N Leonard Warren J |
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| Affiliation: | Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, National Institutes of Health, Building 10, Room 7N252, Bethesda, MD 20892-1674, USA. |
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| Abstract: | Interleukin (IL)-2 is a type I four-alpha-helical bundle cytokine that plays vital roles in antigen-mediated proliferation of peripheral blood T cells and also is critical for activation-induced cell death. We now demonstrate that IL-2 potently decreases expression of IL-7 receptor alpha chain (IL-7Ralpha) mRNA and protein. The fact that IL-7Ralpha is a component of the receptors for both IL-7 and thymic stromal lymphopoietin (TSLP) suggests that IL-2 can negatively regulate signals by each of these cytokines. Previously it was known that the IL-2 and IL-7 receptors shared the common cytokine receptor gamma chain, gamma(c), which suggested a possible competition between these cytokines for a receptor component. Our findings now suggest a previously unknown type of cross-talk between IL-2 and IL-7 signaling by showing that IL-2 signaling can diminish IL-7Ralpha expression via a phosphatidylinositol 3-kinase/Akt-dependent mechanism. |
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