Abstract
The efficacy of immunotherapies in cancer treatment becomes more and more apparent not only in different solid tumors but also in hematological malignancies. However, in acute myeloid leukemia (AML), mechanisms to increase the efficacy of immunotherapeutic approaches have to be further elucidated. Targeting leukemic progenitor and stem cells (LPC/LSC) by specific CTL, for instance, in an adjuvant setting or in minimal residual disease, might be an option to prevent relapse of AML or to treat MRD. Therefore, we investigated the influence of immune checkpoint inhibitors on LAA-specific immune responses by CTL against leukemic myeloid blasts and colony-forming cells including leukemic progenitor cells (CFC/LPC). In functional immunoassays like CFU/CFI (colony-forming units/immunoassays) and ELISpot analysis, we detected specific LAA-directed immune responses against CFC/LPC that are postulated to be the source population of relapse of the disease. The addition of nivolumab (anti-PD-1) significantly increases LAA-directed immune responses against CFC/LPC, no effect is seen when ipilimumab (anti-CTLA-4) is added. The combination of ipilimumab and nivolumab does not improve the effect compared to nivolumab alone. The anti-PD1-directed immune response correlates to PD-L1 expression on progenitor cells. Our data suggest that immunotherapeutic approaches have the potential to target malignant CFC/LPC and anti-PD-1 antibodies could be an immunotherapeutic approach in AML. Moreover, combination with LAA-directed vaccination strategies might also open interesting application possibilities.
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Abbreviations
- Anti-CTLA-4:
-
Anti-cytotoxic T-lymphocyte-associated protein 4, ipilimumab
- Anti-PD-1:
-
Anti-programmed death 1, nivolumab
- CARs:
-
Chimeric antigen receptor T cells
- CFC/LPC:
-
Colony-forming cells including leukemic progenitor cells
- CFI:
-
Colony-forming immunoassays
- DLI:
-
Donor lymphocyte infusion
- GvL:
-
Graft-versus-leukemia
- ICI:
-
Immune checkpoint inhibition
- LAA:
-
Leukemia-associated antigens
- LPC/LSC:
-
Leukemic progenitor and stem cells
- MDS:
-
Myelodysplastic syndrome
- MLPC:
-
Mixed lymphocyte peptide culture
- NPM1mut :
-
Nucleophosmin 1 mutated
- NPM1WT :
-
Nucleophosmin 1 wildtype
- PD-L1:
-
Programmed death 1 ligand 1
- PRAME:
-
Preferentially expressed antigen in melanoma
- RHAMM:
-
Receptor for hyaluronan-mediated motility
- WT1:
-
Wilms’ tumor 1
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Acknowledgements
The authors thank all patients for the donation of samples.
Funding
This work was supported by grants from BMS (Bristol-Myers Squibb, Study ID: CA184-397) to J. Greiner, and in part by the Deutsche Forschungsgemeinschaft (SFB 1074 project B3) to L. Bullinger.
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JG designed this study, analyzed and interpreted the data, and wrote the manuscript. MG performed the research, analyzed the data, and reviewed the manuscript. SH included patients and discussed the manuscript. HS provided material and reviewed the manuscript. MW reviewed the manuscript. LB interpreted the data and reviewed the manuscript. HD reviewed the manuscript and provided material. VS analyzed and interpreted the data, developed and performed some research, and wrote the manuscript.
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J. Greiner received funds from BMS (Bristol-Myers Squibb); the other authors do not have any competing interests with regard to this study.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Registration details: University of Ulm, approval number 221/14, date 20.10.2014 and approval number 334/09, date 08.02.2010 and Ethics Committee Landesärztekammer Baden-Württemberg, date of approval 21.11.2014, approval file number B-F-2014-105 221/14.
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Informed consent was obtained in writing before specimen was taken from all individuals participating in the study. Patients and healthy donors consented to the use of their specimen and data for research and for publication.
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Cell lines were purchased from the DSMZ (German Collection of Microorganisms and Cell Cultures GmbH) and were authenticated: OCI-AML-2 (DSMZ ACC 099), full-matching STR reference profile of OCI-AML-2, authentic; OCI-AML-3 (DSMZ ACC 582), full-matching STR reference profile of OCI-AML-3, authentic.
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Greiner, J., Götz, M., Hofmann, S. et al. Specific T-cell immune responses against colony-forming cells including leukemic progenitor cells of AML patients were increased by immune checkpoint inhibition. Cancer Immunol Immunother 69, 629–640 (2020). https://doi.org/10.1007/s00262-020-02490-2
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DOI: https://doi.org/10.1007/s00262-020-02490-2