Abstract
Immunotherapies that target programmed cell death protein 1 (PD-1) signals are standard therapies for advanced-stage lung cancer, and the expression of programmed death-ligand 1 (PD-L1) in cancer tissue predicts immunotherapy efficacy. Although programmed death-ligand 2 (PD-L2) is expressed in cancer cells and macrophages, similar to PD-L1, its significance in lung cancer is unclear. Double immunohistochemistry analyses using anti-PD-L2 and anti-PU.1 antibodies were carried out on tissue array sections from 231 cases of lung adenocarcinoma, and PD-L2 expression in macrophages was evaluated. High PD-L2 expression in macrophages was associated with longer progression-free survival (PFS) and cancer-specific survival (CSS) and observed more often in females, non-heavy smokers, and patients with epidermal growth factor receptor (EGFR) mutations and those at a lower disease stage. Significant correlations were found more frequently in patients with EGFR mutations. Cell culture studies revealed that cancer cell-derived soluble factors induced PD-L2 overexpression in macrophages, suggesting the involvement of the JAK-STAT signaling pathway. The present findings suggest that PD-L2 expression in macrophages predicts PFS and CSS in lung adenocarcinoma without immunotherapy.
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The data presented in this study are available in this article and its supplementary materials.
Abbreviations
- PD-1:
-
Programmed cell death protein 1
- PD-L1:
-
Programmed cell death 1 ligand 1
- JAK:
-
Janus kinase
- STAT:
-
Signal transducer and activator of transcription
- IHC:
-
Immunohistochemistry
- PFS:
-
Progression-free survival
- CSS:
-
Cancer-specific survival
- EGFR:
-
Epidermal growth factor receptor
- NSCLC:
-
Non-small-cell lung cancer
- TAMs:
-
Tumor-associated macrophages
- ELISA:
-
Enzyme-linked immunosorbent assay
- CM:
-
Conditioned medium
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Acknowledgements
We thank Mr. Takenobu Nakagawa for the technical assistance.
Funding
This work was supported by grants from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Nos. 16H05162 and 20H03459).
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EM: Data curation, Formal Analysis, Investigation, Software, Writing-original draft; YS: Investigation, Software, Visualization; YF: Conceptualization, Methodology, Validation; MS: Supervision; YK: Conceptualization, Funding acquisition, Methodology, Project administration, Resources, Writing-review & editing. All authors read and approved the final version of the manuscript to be submitted.
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The study was approved by the Institutional Review Board of Kumamoto University (#1174), and conducted in accordance with the Declaration of Helsinki. Human macrophages were obtained from healthy donors in accordance with protocols approved by the Kumamoto University Hospital Review Board (approval No. 1169. No animal studies or registry/registration of this study was performed.
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Patient consent for inclusion in this study was waived by the Institutional Review Board of Kumamoto University (#2059) because the CSS and PFS data were obtained from previous reports [10, 15, 16]. Although all of the retrospective patient data were automatically included in the study, the patients were given the opportunity to refuse participation by opting out.
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Matsubara, E., Shinchi, Y., Komohara, Y. et al. PD-L2 overexpression on tumor-associated macrophages is one of the predictors for better prognosis in lung adenocarcinoma. Med Mol Morphol 56, 250–256 (2023). https://doi.org/10.1007/s00795-023-00361-0
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DOI: https://doi.org/10.1007/s00795-023-00361-0