Proceedings of the National Academy of Sciences · 2002 · 184 citations · 38 references
Life SciencesImmunologyMolecular BiologyCell SignalingImmunoregulationSignal TransductionCytokine BiologyCytokine RegulationCytokine SignalingImmune Cell SignalingImmune RegulationImmune SignalingActivation-induced Cell DeathAntigen-induced Lymphocyte ProliferationCell ActivationInterleukin-7 SignalingPhosphatidylinositol 3-Kinase Akt SignalingPhosphatidylinositol 3-Kinase-akt Cross-talkPhosphatidylinositol 3-Kinase-akt PathwayPhosphatidylinositol 3-Kinase-akt Signaling
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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Interleukin-7 mediates the homeostasis of naïve and memory CD8 T cells in vivo
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