IL-15 is an immunomodulating cytokine that stimulates the proliferation of T lymphocytes and shares many biological properties with IL-2. IL-15 exerts its biological activities primarily on T cells. It is also essential in the development, survival and activation of NK cells. Increased expression of IL-15 has been linked to rheumatoid arthritis, inflammatory bowel disease, and diseases affiliated with retroviruses HIV and HTLV-I. Human IL-15 is biologically active on mouse cells as measured by the dose-dependent stimulation of the proliferation of mouse CTLL cells. Recombinant Rat IL-15 is a 13.5 kDa protein consisting of 115 amino acid residues.
MNWIDVRYDL EKIESLIQFI HIDTTLYTDS DFHPSCKVTA MNCFLLELQV ILHEYSNMTL NETVRNVLYL ANSTLSSNKN VIESGCKECE ELEERNFTEF LQSFIHIVQM FINTS
≥ 98% by SDS-PAGE gel and HPLC analyses.
The ED50 as determined by the dose-dependant stimulation of the proliferation of murine CTLL-2 cells is ≤ 10 ng/ml, corresponding to a specific activity of ≥ 1 x 105 units/mg.