Abstract
The contribution of mast cells in the microenvironment of solid malignancies remains controversial. Here we functionally assess the impact of tumor-adjacent, submucosal mast cell accumulation in murine and human intestinal-type gastric cancer. We find that genetic ablation or therapeutic inactivation of mast cells suppresses accumulation of tumor-associated macrophages, reduces tumor cell proliferation and angiogenesis, and diminishes tumor burden. Mast cells are activated by interleukin (IL)-33, an alarmin produced by the tumor epithelium in response to the inflammatory cytokine IL-11, which is required for the growth of gastric cancers in mice. Accordingly, ablation of the cognate IL-33 receptor St2 limits tumor growth, and reduces mast cell-dependent production and release of the macrophage-attracting factors Csf2, Ccl3, and Il6. Conversely, genetic or therapeutic macrophage depletion reduces tumor burden without affecting mast cell abundance. Therefore, tumor-derived IL-33 sustains a mast cell and macrophage-dependent signaling cascade that is amenable for the treatment of gastric cancer.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Aminopyridines / administration & dosage
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Animals
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Cell Degranulation / drug effects
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Cell Degranulation / immunology
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Cromolyn Sodium / administration & dosage
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Disease Models, Animal
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Epithelium / immunology
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Epithelium / pathology
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Female
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Gastric Mucosa / cytology
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Gastric Mucosa / immunology
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Gastric Mucosa / pathology
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Humans
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Interleukin-1 Receptor-Like 1 Protein / immunology
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Interleukin-1 Receptor-Like 1 Protein / metabolism
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Interleukin-33 / immunology*
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Interleukin-33 / metabolism
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Macrophages / immunology*
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Male
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Mast Cells / immunology*
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Mice
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Mice, Transgenic
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Pyrroles / administration & dosage
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Signal Transduction / drug effects
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Signal Transduction / immunology
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Stomach Neoplasms / genetics
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Stomach Neoplasms / immunology*
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Stomach Neoplasms / mortality
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Stomach Neoplasms / pathology
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Tissue Array Analysis
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Tumor Microenvironment / immunology
Substances
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Aminopyridines
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IL1RL1 protein, human
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IL33 protein, human
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Il1rl1 protein, mouse
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Il33 protein, mouse
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Interleukin-1 Receptor-Like 1 Protein
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Interleukin-33
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Pyrroles
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pexidartinib
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Cromolyn Sodium