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Tasmanian devil CD28 and CTLA4 capture CD80 and CD86 from adjacent cells.

Authors :
Wong C
Darby JM
Murphy PR
Pinfold TL
Lennard PR
Woods GM
Lyons AB
Flies AS
Source :
Developmental and comparative immunology [Dev Comp Immunol] 2021 Feb; Vol. 115, pp. 103882. Date of Electronic Publication: 2020 Oct 08.
Publication Year :
2021

Abstract

Immune checkpoint immunotherapy is a pillar of human oncology treatment with potential for non-human species. The first checkpoint immunotherapy approved for human cancers targeted the CTLA4 protein. CTLA4 can inhibit T cell activation by capturing and internalizing CD80 and CD86 from antigen presenting cells, a process called trans-endocytosis. Similarly, CD28 can capture CD80 and CD86 via trogocytosis and retain the captured ligands on the surface of the CD28-expressing cells. The wild Tasmanian devil (Sarcophilus harrisii) population has declined by 77% due to transmissible cancers that evade immune defenses despite genetic mismatches between the host and tumors. We used a live cell-based assay to demonstrate that devil CTLA4 and CD28 can capture CD80 and CD86. Mutation of evolutionarily conserved motifs in CTLA4 altered functional interactions with CD80 and CD86 in accordance with patterns observed in other species. These results suggest that checkpoint immunotherapies can be translated to evolutionarily divergent species.<br /> (Copyright © 2020 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1879-0089
Volume :
115
Database :
MEDLINE
Journal :
Developmental and comparative immunology
Publication Type :
Academic Journal
Accession number :
33039410
Full Text :
https://doi.org/10.1016/j.dci.2020.103882