Abstract
The expression of PD-L1 on tumor cells or within the tumor microenvironment has been associated with good prognosis and sustained clinical responses in immunotherapeutic regimens based on PD-L1/PD-1/CD80 immune checkpoint blockade. To look into the current controversy in cancer immunotherapy of the relative importance of PD-L1 expression on tumor cells versus non-tumor cells of the tumor microenvironment, a hematological mouse tumor model was chosen. By combining a genetic CRISPR/Cas9 and immunotherapeutic approach and using a syngeneic hematopoietic transplantable tumor model (E.G7-cOVA tumor cells), we demonstrated that dual blockade of PD-L1 interaction with PD-1 and CD80 enhanced anti-tumor immune responses that either delayed tumor growth or led to its complete eradication. PD-L1 expression on non-tumor cells of the tumor microenvironment was required for the promotion of tumor immune escape and its blockade elicited potent anti-tumor responses to PD-L1 WT and to PD-L1-deficient tumor cells. PD-L1+ tumors implanted in PD-L1-deficient mice exhibited delayed tumor growth independently of PD-L1 blockade. These findings emphasize that PD-L1 expression on non-tumor cells plays a major role in this tumor model. These observations should turn our attention to the tumor microenvironment in hematological malignancies because of its unappreciated contribution to create a conditioned niche for the tumor to grow and evade the anti-tumor immune response.
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Abbreviations
- APC:
-
Antigen-presenting cells
- ATCC:
-
American Type Culture Collection
- CD:
-
Cluster of differentiation
- CTLA-4:
-
Cytotoxic T-lymphocyte antigen 4
- FCS:
-
Fetal calf serum
- ICB:
-
Immune checkpoint blockade
- mAb:
-
Monoclonal antibody
- MHC:
-
Major histocompatibility complex
- NK:
-
Natural killer
- PCR:
-
Polymerase chain reaction
- PD-1:
-
Programmed death-1
- PD-L1:
-
Programmed death-ligand 1
- PI:
-
Propidium iodide
- pLNs:
-
Peripheral lymph nodes
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- SFM:
-
Serum-free medium
- TCR:
-
T cell receptor
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Funding
This work has been supported by Grant FIS PI# 1300029 (Fondo de Investigaciones Sanitarias, Ministry of Health, Spanish Government, and co-funded by European Union ERDF/ESF, “Investing in your future”), LE093U13 and Unit of Excellence Research UIC #012 (Department of Education of the Regional Government, Junta de Castilla y Leon) and Gerencia Regional de Salud (BIO/01/15) to JIRB. It was also funded by Miguel Servet National Grant (Health National Organization Research) CP12/03063, CPII17/00002 and FIS PI16/00002 (Instituto de Salud Carlos III and co-funded by European Union ERDF/ESF, “Investing in your future”), and Gerencia Regional de Salud GRS963/A/2014, GRS1142/A/2015 and GRS 1505/A/2017 to M.L.R.G. This work has been partially funded by the National Network CIBER-ONC (oncology research) CB16/12/00480.
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Jose-Ignacio Rodriguez-Barbosa and Maria-Luisa del Rio conceived the working hypothesis, performed the experiments, analyzed data and wrote the manuscript. Miyuki Azuma and JA Perez-Simon contributed with reagents, comments and suggestions. Gennadiy Zelinskyy made the in vivo experiments using PD-L1-deficient mice. All authors discussed the results, provided critical input and contributed to the final manuscript.
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The Animal Welfare Committee of the University of Alcala de Henares (Madrid) in accordance with the European Guidelines for Animal Care and Use of Laboratory Animals approved all experiments with rodents (authorization # OH-UAH-2016/015).
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Eight- to 12-week-old female C57BL-6 J (B6, from Janvier Labs) and C57BL/6-Tg (TcraTcrb)1100Mjb/J (also known as OT-I mice) were used in this work. OT-I transgenic mice exhibit a rearranged TCR that recognizes OVA residues 257–264, SIINFEKL peptide in the context of H-2b [63]. These mice were kindly provided by Dr. David Sancho (CNIC, National Center for Cardiovascular Disease, Madrid). B6-background PD-L1−/− (B7-H1-KO) mice were originally generated by Lieping Chen [65].
Cell line authentication
The EL-4 cell line is a chemically induced lymphoma cell line from C57BL/6 mice. E.G7 is a transplantable cell line derived from EL-4 thymoma cells that were transfected with a plasmid carrying a cytoplasmic version of chicken ovalbumin (OVA). Both cell lines were kindly provided by Prof. Dr. Ignacio Melero (CIMA, Navarra, Spain), who obtained them from ATCC. No cell line authentication was necessary.
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Rodriguez-Barbosa, JI., Azuma, M., Zelinskyy, G. et al. Critical role of PD-L1 expression on non-tumor cells rather than on tumor cells for effective anti-PD-L1 immunotherapy in a transplantable mouse hematopoietic tumor model. Cancer Immunol Immunother 69, 1001–1014 (2020). https://doi.org/10.1007/s00262-020-02520-z
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DOI: https://doi.org/10.1007/s00262-020-02520-z