Abstract
Proteins encoded by members of the Ly-49 gene family are predominantly expressed on murine natural killer (NK) cells. Several members of this gene family have been demonstrated to inhibit NK cell lysis upon recognizing their class I ligands on target cells. In this report, we present data supporting that not all Ly-49 proteins inhibit NK cell function. Our laboratory has generated and characterized a monoclonal antibody (mAb) (12A8) that can be used to recognize the Ly-49D subset of murine NK cells. Transfection of Cos-7 cells with known members of the Ly-49 gene family revealed that 12A8 recognizes Ly-49D, but also cross-reacts with the Ly-49A protein on B6 NK cells. In addition, 12A8 demonstrates reactivity by both immunoprecipitation and two-color flow cytometry analysis with an NK cell subset that is distinct from those expressing Ly-49A, C, or G2. An Ly-49D+ subset of NK cells that did not express Ly49A, C, and G2 was isolated and examined for their functional capabilities. Tumor targets and concanovalin A (ConA) lymphoblasts from a variety of H2 haplotypes were examined for their susceptibility to lysis by Ly-49D+ NK cells. None of the major histocompatibility complex class I–bearing targets inhibited lysis of Ly-49D+ NK cells. More importantly, we demonstrate that the addition of mAb 12A8 to Ly-49D+ NK cells can augment lysis of FcγR+ target cells in a reverse antibody-dependent cellular cytotoxicity–type assay and induces apoptosis in Ly49D+ NK cells. Furthermore, the cytoplasmic domain of Ly-49D does not contain the V/IxYxxL immunoreceptor tyrosine-based inhibitory motif found in Ly-49A, C, or G2 that has been characterized in the human p58 killer inhibitory receptors. Therefore, Ly-49D is the first member of the Ly-49 family characterized as transmitting positive signals to NK cells, rather than inhibiting NK cell function.
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Dates
Type | When |
---|---|
Created | 21 years, 2 months ago (June 24, 2004, 3:56 a.m.) |
Deposited | 2 years, 1 month ago (July 28, 2023, 3:53 p.m.) |
Indexed | 4 months, 4 weeks ago (March 31, 2025, 10:24 a.m.) |
Issued | 28 years, 8 months ago (Dec. 1, 1996) |
Published | 28 years, 8 months ago (Dec. 1, 1996) |
Published Online | 28 years, 8 months ago (Dec. 1, 1996) |
Published Print | 28 years, 8 months ago (Dec. 1, 1996) |
@article{Mason_1996, title={The Ly-49D Receptor Activates Murine Natural Killer Cells}, volume={184}, ISSN={1540-9538}, url={http://dx.doi.org/10.1084/jem.184.6.2119}, DOI={10.1084/jem.184.6.2119}, number={6}, journal={The Journal of Experimental Medicine}, publisher={Rockefeller University Press}, author={Mason, L.H. and Anderson, S.K. and Yokoyama, W.M. and Smith, H.R.C. and Winkler-Pickett, R. and Ortaldo, J.R.}, year={1996}, month=dec, pages={2119–2128} }