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Published on: January 7, 2019
2B4 functions as a co-receptor in human NK cell activation
S Sivori1, S Parolini, M Falco
1Dipartimento di Medicina Sperimentale, Università degli Studi di Genova, Italy.
Natural cytotoxicity receptors (NKp46) are crucial for NK cell activation. Human 2B4 triggering depends on NKp46 engagement, not 2B4 molecule heterogeneity, for effective natural cytotoxicity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Natural cytotoxicity receptors (NKp46, NKp44, NKp30) are key in NK cell triggering.
- Human 2B4 can activate NK cells, but its functional heterogeneity was suggested.
Purpose of the Study:
- To investigate the role of NKp46 in 2B4-mediated NK cell activation.
- To determine if functional differences in 2B4 signaling exist.
Main Methods:
- Redirected killing assays using anti-2B4 monoclonal antibodies (mAb) and murine targets.
- Analysis of NK cell clones with varying NKp46 expression (NKp46bright vs. NKp46dull).
- mAb-mediated modulation of NKp46 and co-engagement assays with anti-NKp44 or anti-CD16 mAb.
Main Results:
- 2B4-mediated triggering of murine targets strictly requires NKp46 engagement.
- NKp46bright clones were triggered by anti-2B4 mAb, while NKp46dull clones were not.
- NKp46 modulation affected 2B4 responsiveness, and co-engagement with NKp44 or CD16 enabled 2B4 triggering in NKp46dull cells.
Conclusions:
- Differences in 2B4-induced NK cell responses are due to co-engagement of other triggering receptors, not 2B4 functional heterogeneity.
- NKp46 plays a critical role in 2B4-mediated NK cell activation against target cells.
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