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Human CD8+ Tregs expressing a MHC-specific CAR display enhanced suppression of human skin rejection and GVHD in NSG mice.
- Source :
-
Blood advances [Blood Adv] 2019 Nov 26; Vol. 3 (22), pp. 3522-3538. - Publication Year :
- 2019
-
Abstract
- Polyclonal CD8+CD45RClow/- Tregs are potent regulatory cells able to control solid organ transplantation rejection and even induce tolerance. However, donor major histocompatibility complex (MHC)-specific Tregs are more potent than polyclonal Tregs in suppressing T-cell responses and preventing acute as well as chronic rejection in rodent models. The difficulty of identifying disease-relevant antigens able to stimulate Tregs has reduced the possibility of obtaining antigen-specific Tregs. To bypass this requirement and gain the advantage of antigen specificity, and thus improve the therapeutic potential of CD8+ Tregs, we stably introduced a chimeric antigen receptor (CAR) derived from a HLA-A*02 antigen-specific antibody (A2-CAR) in human CD8+ Tregs and developed a clinically compatible protocol of transduction and expansion. We demonstrated that A2-CAR CD8+ Tregs were not phenotypically altered by the process, were specifically activated, and did not exhibit cytotoxic activity toward HLA-A*02+ kidney endothelial cells (ECs). We showed that A2-CAR CD8+ Tregs were more potent suppressors of immune responses induced by HLA-A*02 mismatch than control-CAR CD8+ Tregs, both in vitro and in vivo, in models of human skin graft rejection and graft-versus-host disease (GVHD) in NOD.Cg-PrkdcscidIl2rgtm1Wjl/SzJ (NSG) mice. We showed that integrity of human skin graft was preserved with A2-CAR CD8+ Tregs at least 100 days in vivo after administration, and that interaction between the A2-CAR CD8+ Tregs and HLA-A*02+ kidney ECs resulted in a fine-tuned and protolerogenic activation of the ECs without cytotoxicity. Together, our results demonstrated the relevance of the CAR engineering approach to develop antigen-specific CAR-CD8+ Tregs for clinical trials in transplantation, and potentially in other diseases.<br /> (© 2019 by The American Society of Hematology.)
- Subjects :
- Animals
Biomarkers
Cell Communication
Disease Models, Animal
Gene Expression
Genetic Engineering
Graft Rejection genetics
Graft Rejection immunology
Graft vs Host Disease etiology
HLA Antigens immunology
HLA-A2 Antigen genetics
HLA-A2 Antigen immunology
Humans
Immune Tolerance
Immunophenotyping
Mice
Mice, Knockout
Receptors, Antigen, T-Cell genetics
Receptors, Chimeric Antigen genetics
Transduction, Genetic
CD8-Positive T-Lymphocytes immunology
CD8-Positive T-Lymphocytes metabolism
Graft vs Host Disease therapy
HLA Antigens genetics
Receptors, Antigen, T-Cell metabolism
Receptors, Chimeric Antigen metabolism
T-Lymphocytes, Regulatory immunology
T-Lymphocytes, Regulatory metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2473-9537
- Volume :
- 3
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- Blood advances
- Publication Type :
- Academic Journal
- Accession number :
- 31730699
- Full Text :
- https://doi.org/10.1182/bloodadvances.2019000411