Pathogen response-like recruitment and activation of neutrophils by sterile immunogenic dying cells drives neutrophil-mediated residual cell killing

Cell Death Differ. 2017 May;24(5):832-843. doi: 10.1038/cdd.2017.15. Epub 2017 Feb 24.

Abstract

Innate immune sensing of dying cells is modulated by several signals. Inflammatory chemokines-guided early recruitment, and pathogen-associated molecular patterns-triggered activation, of major anti-pathogenic innate immune cells like neutrophils distinguishes pathogen-infected stressed/dying cells from sterile dying cells. However, whether certain sterile dying cells stimulate innate immunity by partially mimicking pathogen response-like recruitment/activation of neutrophils remains poorly understood. We reveal that sterile immunogenic dying cancer cells trigger (a cell autonomous) pathogen response-like chemokine (PARC) signature, hallmarked by co-release of CXCL1, CCL2 and CXCL10 (similar to cells infected with bacteria or viruses). This PARC signature recruits preferentially neutrophils as first innate immune responders in vivo (in a cross-species, evolutionarily conserved manner; in mice and zebrafish). Furthermore, key danger signals emanating from these dying cells, that is, surface calreticulin, ATP and nucleic acids stimulate phagocytosis, purinergic receptors and toll-like receptors (TLR) i.e. TLR7/8/9-MyD88 signaling on neutrophil level, respectively. Engagement of purinergic receptors and TLR7/8/9-MyD88 signaling evokes neutrophil activation, which culminates into H2O2 and NO-driven respiratory burst-mediated killing of viable residual cancer cells. Thus sterile immunogenic dying cells perform 'altered-self mimicry' in certain contexts to exploit neutrophils for phagocytic targeting of dead/dying cancer cells and cytotoxic targeting of residual cancer cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Genetically Modified
  • Apoptosis
  • Cell Line, Tumor
  • Chemokine CCL2 / genetics*
  • Chemokine CCL2 / immunology
  • Chemokine CXCL1 / genetics*
  • Chemokine CXCL1 / immunology
  • Chemokine CXCL10 / genetics*
  • Chemokine CXCL10 / immunology
  • Chemokines, CC / genetics*
  • Chemokines, CC / immunology
  • Coculture Techniques
  • Cytotoxicity, Immunologic
  • Epithelial Cells / immunology
  • Epithelial Cells / pathology
  • Female
  • Gene Expression Regulation / immunology
  • Humans
  • Male
  • Melanocytes / immunology
  • Melanocytes / pathology
  • Mice
  • Mice, Inbred C57BL
  • Myeloid Differentiation Factor 88 / genetics
  • Myeloid Differentiation Factor 88 / immunology
  • Neuroglia / immunology
  • Neuroglia / pathology
  • Neutrophils / cytology
  • Neutrophils / immunology*
  • Signal Transduction
  • Toll-Like Receptor 7 / genetics
  • Toll-Like Receptor 7 / immunology
  • Zebrafish

Substances

  • CCL18 protein, human
  • Chemokine CCL2
  • Chemokine CXCL1
  • Chemokine CXCL10
  • Chemokines, CC
  • Myeloid Differentiation Factor 88
  • TLR7 protein, human
  • Toll-Like Receptor 7