Interleukin 15 and its receptor.
1995
: Interleukin 15 (IL-15) is a member of the four-helix bundle cytokine family that shares many in vitro biological activities with IL-2. Previous work demonstrated that IL-15 utilizes the beta and gamma chains of the IL-2 receptor (IL-2R), and that these are essential for IL-15-mediated signal transduction. However, several lines of evidence indicated the existence of an additional, IL-15-specific receptor component. An IL-15 binding chain was identified on a murine T cell clone, and direct expression cloning was used to isolate the corresponding cDNA. The predicted structure of this protein shows sequence similarity to the IL-2R alpha chain. Transfection of this cDNA into a murine, IL-3-dependent myeloid cell line, 32D-01, conferred IL-15 binding and, together with transfection of the IL-2R beta chain, rendered the cells responsive to IL-15 stimulation. This experiment confirmed that the IL-15 binding chain is part of the IL-15 receptor, and it is designated as the IL-15R alpha subunit. The expression pattern of the IL-15R alpha mRNA is distinct from that of IL-2R alpha mRNA. Recombinant expression of a soluble form of IL-15R alpha demonstrated that it is a potent inhibitor of IL-15 biological activity.
Keywords:
- Interleukin 8 receptor, alpha
- Interleukin 12 receptor, beta 1 subunit
- Interleukin 26
- Interleukin 10 receptor, alpha subunit
- Interleukin 1 receptor, type I
- Interleukin 1 receptor, type II
- Interleukin
- Cancer research
- Interleukin 5 receptor alpha subunit
- Biology
- Molecular biology
- Interleukin-4 receptor
- Interleukin-17 receptor
- Chemistry
- G alpha subunit
- Alpha chain
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