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Published in: Cancer Immunology, Immunotherapy 12/2016

Open Access 01-12-2016 | Original Article

Blockade of programmed death-1/programmed death ligand pathway enhances the antitumor immunity of human invariant natural killer T cells

Authors: Toshiko Kamata, Akane Suzuki, Naoko Mise, Fumie Ihara, Mariko Takami, Yuji Makita, Atsushi Horinaka, Kazuaki Harada, Naoki Kunii, Shigetoshi Yoshida, Ichiro Yoshino, Toshinori Nakayama, Shinichiro Motohashi

Published in: Cancer Immunology, Immunotherapy | Issue 12/2016

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Abstract

The role of invariant natural killer T (iNKT) cells in antitumor immunity has been studied extensively, and clinical trials in patients with advanced cancer have revealed a prolonged survival in some cases. In recent years, humanized blocking antibodies against co-stimulatory molecules such as PD-1 have been developed. The enhancement of T cell function is reported to improve antitumor immunity, leading to positive clinical effects. However, there are limited data on the role of PD-1/programmed death ligand (PDL) molecules in human iNKT cells. In this study, we investigated the interaction between PD-1 on iNKT cells and PDL on antigen-presenting cells (APCs) in the context of iNKT cell stimulation. The blockade of PDL1 at the time of stimulation resulted in increased release of helper T cell (Th) 1 cytokines from iNKT cells, leading to the activation of NK cells. The direct antitumor function of iNKT cells was also enhanced after stimulation with anti-PDL1 antibody-treated APCs. According to these results, we conclude that the co-administration of anti-PDL1 antibody and alpha-galactosylceramide (αGalCer)-pulsed APCs enhances iNKT cell-mediated antitumor immunity.
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Metadata
Title
Blockade of programmed death-1/programmed death ligand pathway enhances the antitumor immunity of human invariant natural killer T cells
Authors
Toshiko Kamata
Akane Suzuki
Naoko Mise
Fumie Ihara
Mariko Takami
Yuji Makita
Atsushi Horinaka
Kazuaki Harada
Naoki Kunii
Shigetoshi Yoshida
Ichiro Yoshino
Toshinori Nakayama
Shinichiro Motohashi
Publication date
01-12-2016
Publisher
Springer Berlin Heidelberg
Published in
Cancer Immunology, Immunotherapy / Issue 12/2016
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-016-1901-y

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