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Interleukin 15 (IL-15) is a four alpha-helix bundle cytokine with many similar properties to IL-2, with which it shares components of its receptor. IL-15 is produced by antigen-presenting cells, T cells, and B cells, as well as epithelial and stromal cells (Jabri & Abadie). The IL-15 receptor is a heterotrimeric receptor composed of IL-15Ra (the high-affinity receptor for IL-15), as well as IL-2/IL-15Rb (CD122) and common gamma chain (CD132). IL-15 binds to IL-15Ra and can then be presented in trans to IL-2/IL-15Rb and common gamma chain on other cells. Trans-presentation is thought to be the major mechanism by which IL-15-mediated responses occur in mice, although may not be necessary in humans (Castillo & Schluns). The cytoplasmic domains of IL-2/IL-15Rb and common gamma chain mediate signaling to activate JAK/STAT and PI3K pathways. IL-15 supports the survival and proliferation of CD8+ T cells, and promotes homeostasis of memory T cells. IL-15 also promotes the survival and differentiation of NK cells and regulates their cytolytic activity (Ma et al.).
This product will be discontinued. Limited inventory of Mouse Recombinant IL-15 remains and order requests will be filled subject to availability.
Subtype
Cytokines
Cell Type
Hematopoietic Stem and Progenitor Cells, Lymphocytes, NK Cells
(A) The biological activity of Mouse Recombinant IL-15 was tested by its ability to promote the proliferation of CTLL-2 cells. Cell proliferation was measured after 65 hours of culture using a fluorometric assay method. The EC50 is defined as the effective concentration of the protein at which cell proliferation is at 50% of maximum. The EC50 in the example above is 4.1 ng/mL.
(B) 1 μg of Mouse Recombinant IL-15 was resolved with SDS-PAGE under reducing (+) and non-reducing (-) conditions and visualized by Coomassie Blue staining. Mouse Recombinant IL-15 has a predicted molecular mass of 13.4 kDa.
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