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Front Immunol. 2015 Sep 25;6:495. doi: 10.3389/fimmu.2015.00495. eCollection 2015.

NKp46 Clusters at the Immune Synapse and Regulates NK Cell Polarization.

Author information

1
Department of Surgery, Division of Abdominal Transplantation, Stanford University , Stanford, CA , USA ; The Shraga Segal Department of Microbiology and Immunology and Genetics, Ben-Gurion University of the Negev , Beersheba , Israel.
2
Department of Pediatrics, Division of Immunology, Stanford University , Stanford, CA , USA.
3
Department of Surgery, Division of Abdominal Transplantation, Stanford University , Stanford, CA , USA.
4
The Shraga Segal Department of Microbiology and Immunology and Genetics, Ben-Gurion University of the Negev , Beersheba , Israel.

Abstract

Natural killer (NK) cells play an important role in first-line defense against tumor and virus-infected cells. The activity of NK cells is tightly regulated by a repertoire of cell surface expressed inhibitory and activating receptors. NKp46 is a major NK cell-activating receptor that is involved in the elimination of target cells. NK cells form different types of synapses that result in distinct functional outcomes: cytotoxic, inhibitory, and regulatory. Recent studies revealed that complex integration of NK receptor signaling controls cytoskeletal rearrangement and other immune synapse-related events. However, the distinct nature by which NKp46 participates in NK immunological synapse formation and function remains unknown. In this study, we determined that NKp46 forms microclusters structures at the immune synapse between NK cells and target cells. Over-expression of human NKp46 is correlated with increased accumulation of F-actin mesh at the immune synapse. Concordantly, knock-down of NKp46 in primary human NK cells decreased recruitment of F-actin to the synapse. Live cell imaging experiments showed a linear correlation between NKp46 expression and lytic granules polarization to the immune synapse. Taken together, our data suggest that NKp46 signaling directly regulates the NK lytic immune synapse from early formation to late function.

KEYWORDS:

NKp46; cellular activation; cytoskeleton rearrangement; cytotoxicity; immune synapse

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