Cited by 75Cancer Immunotherapy and BiomarkersT-cell and B-cell ImmunologyImmunotherapy and Immune Responses

Different syngeneic tumors show distinctive intrinsic tumor-immunity and mechanisms of actions (MOA) of anti-PD-1 treatment

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Jin, Ying, An, Xiaoyu, Mao, Binchen, Sun, Ruilin, Kumari, Rajendra, Chen, Xiaobo, Shan, Yongli, Zang, Mingfa +9 more·2022·Scientific Reports

Abstract

Cancers are immunologically heterogeneous. A range of immunotherapies target abnormal tumor immunity via different mechanisms of actions (MOAs), particularly various tumor-infiltrate leukocytes (TILs). We modeled loss of function (LOF) in four common anti-PD-1 antibody-responsive syngeneic tumors, MC38, Hepa1-6, CT-26 and EMT-6, by systematical depleting a series of TIL lineages to explore the mechanisms of tumor immunity and treatment. CD8 + -T-cells, CD4 + -T-cells, T reg , NK cells and macrophages were individually depleted through either direct administration of anti-marker antibodies/reagents or using DTR (diphtheria toxin receptor) knock-in mice, for some syngeneic tumors, where specific subsets were depleted following diphtheria toxin (DT) administration. These LOF experiments revealed distinctive intrinsic tumor immunity and thus different MOAs in their responses to anti-PD-1 antibody among different syngeneic tumors. Specifically, the intrinsic tumor immunity and the associated anti-PD-1 MOA were predominately driven by CD8 + cytotoxic TILs (CTL) in all syngeneic tumors, excluding Hepa1-6 where CD4 + T eff TILs played a key role. TIL-T reg also played a critical role in supporting tumor growth in all four syngeneic models as well as M 2 -macrophages. Pathway analysis using pharmacodynamic readouts of immuno-genomics and proteomics on MC38 and Hepa1-6 also revealed defined, but distinctive, immune pathways of activation and suppression between the two, closely associated with the efficacy and consistent with TIL-pharmacodynamic readouts. Understanding tumor immune-pathogenesis and treatment MOAs in the different syngeneic animal models, not only assists the selection of the right model for evaluating new immunotherapy of a given MOA, but also can potentially help to understand the potential disease mechanisms and strategize optimal immune-therapies in patients.

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  • The authors previously performed in vivo combination studies using anti-PD-1 antibody and five depleting agents in four syngeneic models, showing different mechanisms of action under anti-PD-1 treatment.

    “We previously performed a series of in vivo combination studies using an anti-mouse PD-1 antibody and one of five other antibodies/agents that deplete CD8+ T cells, CD4+ T cells, regulatory T (Treg) cells, natural killer (NK) cells, and tumor-associated macrophages (TAM), respectively, in four anti-PD-1 antibody-responsive syngeneic models to show that they have different mechanisms of actions”

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  1. [13]XiaoyuAn XO Hui Z Tingting L Demin Z Qi-Xiang L Immunophenotyping of orthotopic homograft (syngeneic) of murine primary kpc pancreatic 2 ductal adenocarcinoma by flow cytometry Jove 2018 2 2 PMC6235480 30371656

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Authors
Jin, Y., An, X., Mao, B., Sun, R., Kumari, R., Chen, X., Shan, Y., Zang, M., Xu, L., Muntel, J., Beeler, K., Bruderer, R., Reiter, L., Guo, S., Zhou, D., Li, Q.-X., & Ouyang, X.
Affiliations
  • Peking University (CN)
  • Shanghai Model Organisms (China) (CN)
  • Biognosys (Switzerland) (CH)
Corresponding author
  • Li, Qi-Xiang
  • Ouyang, Xuesong
Venue
Scientific Reports
Published
2022-02-28
Volume
12
Issue
1
Pages
3278-3278
ISSN
2045-2322 (ISSN-L)
OpenAlex
W4214541685
Cited by
73
References
45
Citations by year
2026: 13 · 2025: 18 · 2024: 21 · 2023: 19 · 2022: 2
FWCI
6.28
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Greater South Information System
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
anti-PD-1 therapy, mechanism of action, tumor-infiltrating lymphocytes, syngeneic mouse model, CD8+ cytotoxic T lymphocytes, CD4+ T cells, regulatory T cells, natural killer cells, tumor-associated macrophages, M2 macrophages, T cell depletion, MC38 colon carcinoma, CT26 cells, tumor immune microenvironment
MeSH terms
Animals, Antineoplastic Agents, Humans, Immunotherapy, Lymphocytes, Tumor-Infiltrating, CD8-Positive T-Lymphocytes, Cell Line, Tumor, T-Lymphocytes, Regulatory, Mice, Tumor Microenvironment

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