Cited by 51Immune Cell Function and InteractionCancer Immunotherapy and BiomarkersImmunotherapy and Immune Responses

Blockade of checkpoint receptor PVRIG unleashes anti-tumor immunity of NK cells in murine and human solid tumors

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Li, Yangyang, Zhang, Yu, Cao, Guoshuai, Zheng, Xiaodong, Sun, Cheng, Wei, Haiming, Tian, Zhigang, Xiao, Weihua +2 more·2021·Journal of Hematology & Oncology

Abstract

Background: Although checkpoint-based immunotherapy has shown exciting results in the treatment of tumors, around 70% of patients have experienced unresponsiveness. PVRIG is a recently identified immune checkpoint receptor and blockade of which could reverse T cell exhaustion to treat murine tumor; however, its therapeutic potential via NK cells in mice and human remains seldom reported. Methods: In this study, we used patient paraffin-embedded colon adenocarcinoma sections, various murine tumor models (MC38 colon cancer, MCA205 fibrosarcoma and LLC lung cancer), and human NK cell- or PBMC-reconstituted xenograft models (SW620 colon cancer) to investigate the effect of PVRIG on tumor progression. Results: We found that PVRIG was highly expressed on tumor-infiltrating NK cells with exhausted phenotype. Furthermore, either PVRIG deficiency, early blockade or late blockade of PVRIG slowed tumor growth and prolonged survival of tumor-bearing mice by inhibiting exhaustion of NK cells as well as CD8+ T cells. Combined blockade of PVRIG and PD-L1 showed better effect in controlling tumor growth than using either one alone. Depletion of NK or/and CD8+ T cells in vivo showed that both cell types contributed to the anti-tumor efficacy of PVRIG blockade. By using Rag1−/− mice, we demonstrated that PVRIG blockade could provide therapeutic effect in the absence of adaptive immunity. Further, blockade of human PVRIG with monoclonal antibody enhanced human NK cell function and inhibited human tumor growth in NK cell- or PBMC-reconstituted xenograft mice. Conclusions: Our results reveal the importance of NK cells and provide novel knowledge for clinical application of PVRIG-targeted drugs in future.

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  • Other ICIs such as α-LAG-3, α-PVRIG, α-TIGIT, α-Siglec-10 also synergized with α-PD-1/PD-L1 in enhancing TIL function and suppressing tumor growth.

    “Besides α-TIM-3, other ICIs such as α-LAG-3, α-PVRIG, α-TIGIT, α- Siglec-10 also synergized with α-PD-1/PD-L1 in enhancing TIL function and suppressing tumor growth [161–164].”

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  1. [46]COM701 shows antitumor activity, +/- nivolumab. Cancer Discov. 2020; 10(6):752. 32345592

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Authors
Li, Y., Zhang, Y., Cao, G., Zheng, X., Sun, C., Wei, H., Tian, Z., Xiao, W., Sun, R., & Sun, H.
Affiliations
University of Science and Technology of China (CN)
Corresponding author
  • Sun, Rui
  • Sun, Haoyu
Venue
Journal of Hematology & Oncology
Published
2021-06-26
Volume
14
Issue
1
Pages
100-100
ISSN
1756-8722 (ISSN-L)
OpenAlex
W3175390778
Cited by
51
References
47
Citations by year
2026: 3 · 2025: 9 · 2024: 17 · 2023: 10 · 2022: 8 · 2021: 4
FWCI
3.63
Type
journal article
Language
en
Open access
Locations
  • Journal of Hematology & Oncology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Key R&D Program of China (2019YFA0508502/3)
  • National Natural Science Foundation of China (81788101, 82071766, 81972679, 81821001)
  • CAMS Innovation Fund for Medical Sciences (2019-I2M-5-073)
  • Chinese Academy of Sciences (XDB29030201)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Cell Function and Interaction
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
PVRIG, immune checkpoint blockade, natural killer cells, NK cell exhaustion, CD8+ T cell exhaustion, antitumor immunity, PD-L1, colon adenocarcinoma, fibrosarcoma, lung cancer, tumor-infiltrating lymphocytes, tumor growth inhibition
MeSH terms
Antineoplastic Agents, Immunological, Immune Checkpoint Inhibitors, Animals, Humans, Immunotherapy, Killer Cells, Natural, Mice, Inbred C57BL, Neoplasms, Receptors, Cell Surface, Cell Line, Tumor, Mice

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