IL-33-mediated mast cell activation promotes gastric cancer through macrophage mobilization

Nat Commun. 2019 Jun 21;10(1):2735. doi: 10.1038/s41467-019-10676-1.

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

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aminopyridines / administration & dosage
  • Animals
  • Cell Degranulation / drug effects
  • Cell Degranulation / immunology
  • Cromolyn Sodium / administration & dosage
  • Disease Models, Animal
  • Epithelium / immunology
  • Epithelium / pathology
  • Female
  • Gastric Mucosa / cytology
  • Gastric Mucosa / immunology
  • Gastric Mucosa / pathology
  • Humans
  • Interleukin-1 Receptor-Like 1 Protein / immunology
  • Interleukin-1 Receptor-Like 1 Protein / metabolism
  • Interleukin-33 / immunology*
  • Interleukin-33 / metabolism
  • Macrophages / immunology*
  • Male
  • Mast Cells / immunology*
  • Mice
  • Mice, Transgenic
  • Pyrroles / administration & dosage
  • Signal Transduction / drug effects
  • Signal Transduction / immunology
  • Stomach Neoplasms / genetics
  • Stomach Neoplasms / immunology*
  • Stomach Neoplasms / mortality
  • Stomach Neoplasms / pathology
  • Tissue Array Analysis
  • Tumor Microenvironment / immunology

Substances

  • Aminopyridines
  • IL1RL1 protein, human
  • IL33 protein, human
  • Il1rl1 protein, mouse
  • Il33 protein, mouse
  • Interleukin-1 Receptor-Like 1 Protein
  • Interleukin-33
  • Pyrroles
  • pexidartinib
  • Cromolyn Sodium