Abstract
The development of immune checkpoint inhibitors represents a major breakthrough in cancer therapy. Nevertheless, a substantial number of patients fail to respond to checkpoint pathway blockade. Evidence for WNT/β-catenin signaling-mediated immune evasion is found in a subset of cancers including melanoma. Currently, there are no therapeutic strategies available for targeting WNT/β-catenin signaling. Here we show that a specific small-molecule tankyrase inhibitor, G007-LK, decreases WNT/β-catenin and YAP signaling in the syngeneic murine B16-F10 and Clone M-3 melanoma models and sensitizes the tumors to anti-PD-1 immune checkpoint therapy. Mechanistically, we demonstrate that the synergistic effect of tankyrase and checkpoint inhibitor treatment is dependent on loss of β-catenin in the tumor cells, anti-PD-1-stimulated infiltration of T cells into the tumor and induction of an IFNγ- and CD8+ T cell-mediated anti-tumor immune response. Our study uncovers a combinatorial therapeutical strategy using tankyrase inhibition to overcome β-catenin-mediated resistance to immune checkpoint blockade in melanoma.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adaptor Proteins, Signal Transducing / genetics
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Adaptor Proteins, Signal Transducing / metabolism
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Animals
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Antineoplastic Combined Chemotherapy Protocols / pharmacology*
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CD8-Positive T-Lymphocytes / drug effects
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CD8-Positive T-Lymphocytes / immunology
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CD8-Positive T-Lymphocytes / metabolism
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Cytotoxicity, Immunologic / drug effects
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Drug Synergism
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Enzyme Inhibitors / pharmacology*
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Female
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HEK293 Cells
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Humans
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Immune Checkpoint Inhibitors / pharmacology*
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Interferon-gamma / metabolism
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Lymphocytes, Tumor-Infiltrating / drug effects
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Lymphocytes, Tumor-Infiltrating / immunology
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Lymphocytes, Tumor-Infiltrating / metabolism
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Melanoma, Experimental / drug therapy*
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Melanoma, Experimental / enzymology
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Melanoma, Experimental / immunology
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Melanoma, Experimental / pathology
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Mice, Inbred C57BL
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Mice, Inbred DBA
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Mice, Transgenic
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Programmed Cell Death 1 Receptor / antagonists & inhibitors*
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Programmed Cell Death 1 Receptor / metabolism
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Skin Neoplasms / drug therapy*
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Skin Neoplasms / enzymology
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Skin Neoplasms / immunology
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Skin Neoplasms / pathology
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Sulfones / pharmacology*
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Tankyrases / antagonists & inhibitors*
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Tankyrases / metabolism
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Triazoles / pharmacology*
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Tumor Burden / drug effects
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Wnt Signaling Pathway / drug effects*
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YAP-Signaling Proteins
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beta Catenin / genetics
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beta Catenin / metabolism
Substances
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Adaptor Proteins, Signal Transducing
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CTNNB1 protein, mouse
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Enzyme Inhibitors
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G007-LK
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IFNG protein, mouse
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Immune Checkpoint Inhibitors
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Pdcd1 protein, mouse
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Programmed Cell Death 1 Receptor
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Sulfones
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Triazoles
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YAP-Signaling Proteins
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Yap1 protein, mouse
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beta Catenin
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Interferon-gamma
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Tankyrases