Stimulation of MHC class I binding receptors on decidual NK clones.
Related Journal & Article Information
Journal: Nature Medicine
Article Title: Decidual NK cells regulate key developmental processes at the human fetal-maternal interface
Introduction
Stimulation of KIR receptors
Materials
Reagents
We used anti-KIR2DS4 mAb (RnD systems), anti-LIR1 mab (HPF1 clone, kindly provided by Dr. Miguel Lopez-Botet) and EB6 mAb directed against KIR2DL1 and KIR2DS1 (Immunotech, Westbrook, ME).
Equipment
Procedure
1) Perform in vitro culture and generation of IL-2 dNK clones as previously described [1,2].
2) Characterize NK clones for their expression of KIR2DS4, LIR-1 and KIR2DL1 receptors.
3) Select clones that were positive for only one of these receptors for co-incubation experiments. Among EB6 positive clones, select only the clones on which functional expression of KIR2DL1 was verified by inhibition of killing Cw4 and Cw6 transfected 721.221 target cells 28.
4) The MHC class I negative cell line 721.221 has been previously used to generate transfectants with ligands for a number of activating and inhibitory KIR receptors (721.221-Cw4, 721.221-Cw6, 721.221-HLA-G) 2,3. We performed co-culturing experiments of 30 X 103 dNK cells per well from each clone expressing a certain characterized receptor profile with an equal amount of different irradiated 721.221 transfectant cells for 72 hours at 37oC 5% CO2 in Bio-MPM-1 medium with 5% pen-strep and non-essential amino acids, followed by ELISA measurement of produced cytokines.
Troubleshooting
Critical Steps
Anticipated Results
References
1. Katz, G. et al. MHC class I-independent recognition of NK-activating receptor KIR2DS4. J Immunol 173, 1819-25 (2004).
2. Katz, G., Markel, G., Mizrahi, S., Arnon, T.I. & Mandelboim, O. Recognition of HLA-Cw4 but not HLA-Cw6 by the NK cell receptor killer cell Ig-like receptor two-domain short tail number 4. J Immunol 166, 7260-7 (2001).
3. Gonen-Gross, T. et al. Complexes of HLA-G protein on the cell surface are important for leukocyte Ig-like receptor-1 function. J Immunol 171, 1343-51 (2003).
Acknowledgements
Keywords
KIRs, NK , stimulation