Cited by 198Cancer Immunotherapy and BiomarkersImmunotherapy and Immune ResponsesT-cell and B-cell Immunology

ATR kinase inhibitor AZD6738 potentiates CD8+ T cell-dependent antitumor activity following radiation

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Vendetti, Frank P., Karukonda, Pooja, Clump, David A., Teo, Troy, Lalonde, Ronald, Nugent, Katriana, Ballew, Matthew, Kiesel, Brian F. +8 more·2018·Journal of Clinical Investigation

Abstract

DNA-damaging chemotherapy and radiation therapy are integrated into the treatment paradigm of the majority of cancer patients. Recently, immunotherapy that targets the immunosuppressive interaction between programmed death 1 (PD-1) and its ligand PD-L1 has been approved for malignancies including non-small cell lung cancer, melanoma, and head and neck squamous cell carcinoma. ATR is a DNA damage-signaling kinase activated at damaged replication forks, and ATR kinase inhibitors potentiate the cytotoxicity of DNA-damaging chemotherapies. We show here that the ATR kinase inhibitor AZD6738 combines with conformal radiation therapy to attenuate radiation-induced CD8+ T cell exhaustion and potentiate CD8+ T cell activity in mouse models of Kras-mutant cancer. Mechanistically, AZD6738 blocks radiation-induced PD-L1 upregulation on tumor cells and dramatically decreases the number of tumor-infiltrating Tregs. Remarkably, AZD6738 combines with conformal radiation therapy to generate immunologic memory in complete responder mice. Our work raises the possibility that a single pharmacologic agent may enhance the cytotoxic effects of radiation while concurrently potentiating radiation-induced antitumor immune responses.

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  • ATR inhibitors counteract the ability of radiation therapy to increase PD-L1.

    “Moreover, ATR inhibitors appear to offset the ability of RT to drive PD-L1 upregulation (Vendetti et al., 2018) and hence synergize with RT and ICIs in the control of mouse hepatocellular carcinomas established in immunocompetent hosts (Sheng et al., 2020).”

    From Immunomodulation by targeted anticancer agents (2021) · cites this paper as Vendetti et al., 2018

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Authors
Vendetti, F. P., Karukonda, P., Clump, D. A., Teo, T., Lalonde, R., Nugent, K., Ballew, M., Kiesel, B. F., Beumer, J. H., Sarkar, S. N., Conrads, T. P., O’Connor, M. J., Ferris, R. L., Tran, P. T., Delgoffe, G. M., & Bakkenist, C. J.
Affiliations
  • University of Pittsburgh (US)
  • Johns Hopkins University (US)
  • Inova Health System (US)
  • AstraZeneca (United Kingdom) (GB)
Corresponding author
Bakkenist, Christopher J.
Venue
Journal of Clinical Investigation
Published
2018-08-13
Volume
128
Issue
9
Pages
3926-3940
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W2810414233
Cited by
198
References
48
Citations by year
2026: 11 · 2025: 19 · 2024: 22 · 2023: 25 · 2022: 34 · 2021: 43 · 2020: 29 · 2019: 14 · 2018: 1
FWCI
8.18
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • NIH Office of the Director (R01CA204173, P50CA097190, R01CA166348, P30CA047904, as listed)
  • Sidney Kimmel Foundation for Cancer Research (SKF-015-039)
  • Stand Up To Cancer (SU2C-AACR-IRG-04-16)
Topics
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
Keywords
AZD6738, ATR inhibitors, CD8+ T cells, radiotherapy, PD-L1 upregulation, PD-1/PD-L1 axis, T cell exhaustion, regulatory T cells, KRAS-mutant cancer, immunological memory, combination immunotherapy, DNA damage signaling
MeSH terms
Adenocarcinoma of Lung, Animals, Humans, Indoles, Mice, Inbred BALB C, Morpholines, Neoplasms, Experimental, Pyrimidines, Sulfonamides, Sulfoxides, Colorectal Neoplasms, Lymphocytes, Tumor-Infiltrating, Proto-Oncogene Proteins p21(ras), CD8-Positive T-Lymphocytes, Radiotherapy, Conformal, Cell Line, Tumor, Protein Kinase Inhibitors, Mice, Chemoradiotherapy, B7-H1 Antigen, Ataxia Telangiectasia Mutated Proteins

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