Abstract
Natural killer (NK) cells are large granular lymphocytes that keep in check the health of neighboring cells through a large array of intrinsically expressed germline-coded receptors. Most importantly, CD16 is a low affinity Fc receptor for IgG that mediates the antibody-dependent cellular cytotoxicity (ADCC) of NK cells, bridging the innate and adaptive immunities. There has been a significant interest in genetically engineering NK cells to enhance its ADCC, with the ultimate goal to produce off-the-shelf NK cell therapy products that can be combined with target-specific monoclonal antibodies to improve clinical outcomes. Previous protocols of ADCC assays use complex cell-based antigen-antibody models, which are both costly and time-consuming. This current protocol is devoid of target cells and uses plate-bound immobilized anti-CD16 antibodies as the trigger. It greatly shortens the experimental time, while faithfully evaluating NK cells ADCC. Graphic abstract: Workflow of stimulating NK cells via CD16 by plate-bound anti-CD16 mAb.
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