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Interleukin 15-mediated survival of natural killer cells is determined by interactions among Bim, Noxa and Mcl-1.

ABSTRACT: Interleukin 15 (IL-15) promotes the survival of natural killer (NK) cells by preventing apoptosis through mechanisms unknown at present. Here we identify Bim, Noxa and Mcl-1 as key regulators of IL-15-dependent survival of NK cells. IL-15 suppressed apoptosis by limiting Bim expression through the kinases Erk1 and Erk2 and mechanisms dependent on the transcription factor Foxo3a, while promoting expression of Mcl-1, which was necessary and sufficient for the survival of NK cells. Withdrawal of IL-15 led to upregulation of Bim and, accordingly, both Bim-deficient and Foxo3a-/- NK cells were resistant to cytokine deprivation. Finally, IL-15-mediated inactivation of Foxo3a and cell survival were dependent on phosphotidylinositol-3-OH kinase. Thus, IL-15 regulates the survival of NK cells at multiple steps, with Bim and Noxa being key antagonists of Mcl-1, the critical survivor factor in this process.

SUBMITTER: Huntington ND

PROVIDER: S-EPMC2951739 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature

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Interleukin 15-mediated survival of natural killer cells is determined by interactions among Bim, Noxa and Mcl-1.

Huntington Nicholas D ND Puthalakath Hamsa H Gunn Priscilla P Naik Edwina E Michalak Ewa M EM Smyth Mark J MJ Tabarias Hyacinth H Degli-Esposti Mariapia A MA Dewson Grant G Willis Simon N SN Motoyama Noboru N Huang David C S DC Nutt Stephen L SL Tarlinton David M DM Strasser Andreas A

Nature immunology 20070708 8

Interleukin 15 (IL-15) promotes the survival of natural killer (NK) cells by preventing apoptosis through mechanisms unknown at present. Here we identify Bim, Noxa and Mcl-1 as key regulators of IL-15-dependent survival of NK cells. IL-15 suppressed apoptosis by limiting Bim expression through the kinases Erk1 and Erk2 and mechanisms dependent on the transcription factor Foxo3a, while promoting expression of Mcl-1, which was necessary and sufficient for the survival of NK cells. Withdrawal of IL ...[more]

PMID: 17618288

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Project description:Natural killer (NK) cells belong to the first line of host defense against infection and cancer. Cytokines, including interleukin-15 (IL-15), critically regulate NK cell activity, resulting in recognition and direct killing of transformed and infected target cells. NK cells have to adapt and respond in inflamed and often hypoxic areas. Cellular stabilization and accumulation of the transcription factor hypoxia-inducible factor-1? (HIF-1?) is a key mechanism of the cellular hypoxia response. At the same time, HIF-1? plays a critical role in both innate and adaptive immunity. While the HIF-1? hydroxylation and degradation pathway has been recently described with the help of mathematical methods, less is known concerning the mechanistic mathematical description of processes regulating the levels of HIF-1? mRNA and protein. In this work we combine mathematical modeling with experimental laboratory analysis and examine the dynamic relationship between HIF-1? mRNA, HIF-1? protein, and IL-15-mediated upstream signaling events in NK cells from human blood. We propose a system of non-linear ordinary differential equations with positive and negative feedback loops for describing the complex interplay of HIF-1? regulators. The experimental design is optimized with the help of mathematical methods, and numerical optimization techniques yield reliable parameter estimates. The mathematical model allows for the investigation and prediction of HIF-1? stabilization under different inflammatory conditions and provides a better understanding of mechanisms mediating cellular enrichment of HIF-1?. Thanks to the combination of in vitro experimental data and in silico predictions we identified the mammalian target of rapamycin (mTOR), the nuclear factor-?B (NF-?B), and the signal transducer and activator of transcription 3 (STAT3) as central regulators of HIF-1? accumulation. We hypothesize that the regulatory pathway proposed here for NK cells can be extended to other types of immune cells. Understanding the molecular mechanisms involved in the dynamic regulation of the HIF-1? pathway in immune cells is of central importance to the immune cell function and could be a promising strategy in the design of treatments for human inflammatory diseases and cancer.

Dataset Information

Interleukin 15-mediated survival of natural killer cells is determined by interactions among Bim, Noxa and Mcl-1.

Publications

Interleukin 15-mediated survival of natural killer cells is determined by interactions among Bim, Noxa and Mcl-1.

Similar Datasets

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