LAG-3 and PD-1+LAG-3 inhibition promote anti-tumor immune responses in human autologous melanoma/T cell co-cultures.

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Version: Final published version
License: CC BY-NC 4.0
Serval ID
serval:BIB_FD23668D4829
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
LAG-3 and PD-1+LAG-3 inhibition promote anti-tumor immune responses in human autologous melanoma/T cell co-cultures.
Journal
Oncoimmunology
Author(s)
Gestermann N., Saugy D., Martignier C., Tillé L., Fuertes Marraco S.A., Zettl M., Tirapu I., Speiser D.E., Verdeil G.
ISSN
2162-4011 (Print)
ISSN-L
2162-4011
Publication state
Published
Issued date
2020
Peer-reviewed
Oui
Volume
9
Number
1
Pages
1736792
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: epublish
Abstract
Despite the success of immunotherapy using checkpoint blockade, many patients with solid tumors remain refractory to these treatments. In human cancer, the experimental options to investigate the specific effects of antibodies blocking inhibitory receptors are limited and it is still unclear which cell types are involved. We addressed the question whether the direct interaction between T cells and tumor cells can be enforced through blocking a set of inhibitory receptors including PD-1, TIM-3, BTLA and LAG-3, blocked either individually or in dual combinations with the anti-PD-1 antibody, and to determine the condition that induces maximal T cell function preventing tumor cell proliferation. Using short-term Melan-A-specific or autologous re-stimulations, checkpoint blockade did not consistently increase cytokine production by tumor-derived expanded T cells. We next set up a 5-day co-culture assay with autologous melanoma cell lines and expanded tumor infiltrating T cells, originating from tumor specimens obtained from 6 different patients. Amongst all combos tested, we observed that blockade of LAG-3 alone, and more strongly when combined with PD-1 blockade, enforced T cell responses and tumor cell growth control. The combination of anti-LAG-3 plus anti-PD-1 acted through CD8 T cells and led to increased IFNγ production and cytotoxic capacity. Our results show that LAG-3 and PD-1 are regulating the direct interaction between tumor cells and autologous T cells, suggesting that therapy effects may be promoted by enhanced access of the corresponding blocking reagents to the tumor microenvironment.
Keywords
Immunology, Immunology and Allergy, Oncology, Checkpoint blockade, LAG-3, PD-1, autologous T cells, human melanoma, in vitro screening
Pubmed
Web of science
Open Access
Yes
Create date
25/05/2020 16:23
Last modification date
25/02/2021 7:26
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