Chimeric antigen receptor T cells form nonclassical and potent immune synapses driving rapid cytotoxicity
Journal Title
Proceedings of the National Academy of Sciences of the United States of America
Publication Type
Journal Article
Abstract
Chimeric antigen receptor T (CAR-T) cells are effective serial killers with a faster off-rate from dying tumor cells than CAR-T cells binding target cells through their T cell receptor (TCR). Here we explored the functional consequences of CAR-mediated signaling using a dual-specific CAR-T cell, where the same cell was triggered via TCR (tcrCTL) or CAR (carCTL). The carCTL immune synapse lacked distinct LFA-1 adhesion rings and was less reliant on LFA to form stable conjugates with target cells. carCTL receptors associated with the synapse were found to be disrupted and formed a convoluted multifocal pattern of Lck microclusters. Both proximal and distal receptor signaling pathways were induced more rapidly and subsequently decreased more rapidly in carCTL than in tcrCTL. The functional consequence of this rapid signaling in carCTL cells included faster lytic granule recruitment to the immune synapse, correlating with faster detachment of the CTL from the target cell. This study provides a mechanism for how CAR-T cells can debulk large tumor burden quickly and may contribute to further refinement of CAR design for enhancing the quality of signaling and programming of the T cell.
Publisher
NAS
WEHI Research Division(s)
Immunology; Bioinformatics
PubMed ID
29440406
Open Access at Publisher's Site
https://doi.org/10.1073/pnas.1716266115
Rights Notice
Refer to copyright notice on published article.


Creation Date: 2018-02-28 10:12:11
Last Modified: 2018-02-28 11:31:53
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