CD300ld on neutrophils is required for tumour-driven immune suppression

Nature. 2023 Sep;621(7980):830-839. doi: 10.1038/s41586-023-06511-9. Epub 2023 Sep 6.

Abstract

The immune-suppressive tumour microenvironment represents a major obstacle to effective immunotherapy1,2. Pathologically activated neutrophils, also known as polymorphonuclear myeloid-derived suppressor cells (PMN-MDSCs), are a critical component of the tumour microenvironment and have crucial roles in tumour progression and therapy resistance2-4. Identification of the key molecules on PMN-MDSCs is required to selectively target these cells for tumour treatment. Here, we performed an in vivo CRISPR-Cas9 screen in a tumour mouse model and identified CD300ld as a top candidate of tumour-favouring receptors. CD300ld is specifically expressed in normal neutrophils and is upregulated in PMN-MDSCs upon tumour-bearing. CD300ld knockout inhibits the development of multiple tumour types in a PMN-MDSC-dependent manner. CD300ld is required for the recruitment of PMN-MDSCs into tumours and their function to suppress T cell activation. CD300ld acts via the STAT3-S100A8/A9 axis, and knockout of Cd300ld reverses the tumour immune-suppressive microenvironment. CD300ld is upregulated in human cancers and shows an unfavourable correlation with patient survival. Blocking CD300ld activity inhibits tumour development and has synergistic effects with anti-PD1. Our study identifies CD300ld as a critical immune suppressor present on PMN-MDSCs, being required for tumour immune resistance and providing a potential target for cancer immunotherapy.

MeSH terms

  • Animals
  • CRISPR-Cas Systems
  • Disease Progression
  • Gene Editing
  • Humans
  • Immunotherapy
  • Lymphocyte Activation
  • Mice
  • Myeloid-Derived Suppressor Cells* / immunology
  • Myeloid-Derived Suppressor Cells* / pathology
  • Neoplasms* / immunology
  • Neoplasms* / pathology
  • Neutrophils* / immunology
  • Neutrophils* / pathology
  • Receptors, Immunologic* / immunology
  • Survival Analysis
  • T-Lymphocytes / cytology
  • T-Lymphocytes / immunology
  • T-Lymphocytes / pathology
  • Tumor Microenvironment

Substances

  • CD300LD protein, human
  • Receptors, Immunologic
  • Cd300ld protein, mouse