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Fusobacterium nucleatum  is involved in the development of colorectal cancer (CRC) through innate immune cell modulation. However, the receptors of the interaction between  F. nucleatum  ssp. and immune cells remain largely undetermined. Here, we showed that  F. nucleatum  ssp.  animalis  interacts with Siglecs (sialic acid–binding immunoglobulin-like lectins) expressed on innate immune cells with highest binding to Siglec-7. Binding to Siglec-7 was also observed using  F. nucleatum -derived outer membrane vesicles (OMVs) and lipopolysaccharide (LPS).  F. nucleatum  and its derived OMVs or LPS induced a pro-inflammatory profile in human monocyte-derived dendritic cells (moDCs) and a tumour associated profile in human monocyte-derived macrophages (moMϕs). Siglec-7 silencing in moDCs or CRISPR-cas9 Siglec-7-depletion of U-937 macrophage cells altered  F. nucleatum  induced cytokine but not marker expression. The molecular interaction between Siglec-7 and the LPS O-antigen purified from  F. nucleatum  ssp.  animalis  was further characterised by saturation transfer difference (STD) NMR spectroscopy, revealing novel ligands for Siglec-7. Together, these data support a new role for Siglec-7 in mediating immune modulation by  F. nucleatum  strains and their OMVs through recognition of LPS on the bacterial cell surface. This opens a new dimension in our understanding of how  F. nucleatum  promotes CRC progression through the generation of a pro-inflammatory environment and provides a molecular lead for the development of novel cancer therapeutic approaches targeting  F. nucleatum -Siglec-7 interaction.

Siglec-7 Mediates Immunomodulation by Colorectal Cancer-Associated Fusobacterium nucleatum ssp. animalis