CD56 regulates human NK cell cytotoxicity through Pyk2
- Baylor College of Medicine, United States
- Columbia University, United States
- Barnard College, United States
- Washington University, United States
- Rice University, United States
- Washington University School of Medicine, United States
Abstract
Human natural killer (NK) cells are defined as CD56+CD3−. Despite its ubiquitous expression on human NK cells the role of CD56 (NCAM) in human NK cell cytotoxic function has not been defined. In non-immune cells, NCAM can induce signaling, mediate adhesion, and promote exocytosis through interactions with focal adhesion kinase (FAK). Here we demonstrate that deletion of CD56 on the NK92 cell line leads to impaired cytotoxic function. CD56-knockout (KO) cells fail to polarize during immunological synapse (IS) formation and have severely impaired exocytosis of lytic granules. Phosphorylation of the FAK family member Pyk2 at tyrosine 402 is decreased in NK92 CD56-KO cells, demonstrating a functional link between CD56 and signaling in human NK cells. Cytotoxicity, lytic granule exocytosis, and the phosphorylation of Pyk2 are rescued by the reintroduction of CD56. These data highlight a novel functional role for CD56 in stimulating exocytosis and promoting cytotoxicity in human NK cells.
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All data generated or analysed during this study are included in the manuscript and supporting files.
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Funding
National Institutes of Health (R01AI137073)
- Emily M Mace
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Ethics
Human subjects: Peripheral blood NK cells were obtained in accordance with the Declaration of Helsinki with the written and informed consent of all participants under the guidance of the Institutional Review Boards of Baylor College of Medicine (IRB H-30487) and Columbia University (IRB AAAR7377).
Copyright
© 2020, Gunesch et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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CD56 regulates human NK cell cytotoxicity through Pyk2
eLife 9:e57346.
https://doi.org/10.7554/eLife.57346
