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- W2023708059 abstract "The regulation of mast cell activities and survival is a central issue in inflammatory immune responses. Here, we have investigated the role of mouse interleukin-15, a pro-inflammatory and pleiotropic cytokine, in the control of mast cell survival and homeostasis. We report that aged IL-15−/− mice show a reduced number of peritoneal mast cells compared to WT mice. Furthermore, IL-15 deficiency in bone marrow derived mouse mast cells (BMMCs) results in increased susceptibility to apoptosis mediated by growth factor deprivation and A-SMase-treatment. IL-15−/− BMMCs show a constitutive stronger mRNA and protein expression as well as enzymatic activity of the members of the mitochondrial apoptotic pathways including acidic lysosomal aspartate protease cathepsin D (CTSD), endogenous acid sphingomyelinase (A-SMase), caspase-3 and -7 compared to wild type (WT) BMMCs. Furthermore, IL-15−/− BMMCs constitutively generate more A-SMase-derived ceramide than WT controls and display a decreased expression of pro-survival sphingosin-1-phosphate (SPP) both in cytosol and membrane cell fractions. Furthermore, pre-treatment of mast cells with imipramine or pepstatin A, inhibitors of the intracellular acid sphingomyelinase and cathepsin D pathways respectively, increases survival in IL-15−/− BMMCs. These findings suggest that intracellular IL-15 is a key regulator of pathways controlling primary mouse mast cell homeostasis." @default.
- W2023708059 created "2016-06-24" @default.
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- W2023708059 date "2009-10-01" @default.
- W2023708059 modified "2023-10-15" @default.
- W2023708059 title "Intracellular IL-15 controls mast cell survival" @default.
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- W2023708059 doi "https://doi.org/10.1016/j.yexcr.2009.07.019" @default.
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