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Invasion by Fusobacterium nucleatum Causes Upregulation of dll4 and klf4 Expression in Caco-2 Cells

Allen-Vercoe, E.; Cochrane, K.; Robinson, A. V.; Powers, J.; Brown, S. D.; Holt, R. A.

2020-10-26 cancer biology
10.1101/2020.10.26.354910 bioRxiv
Show abstract

Fusobacterium nucleatum is an emerging microbe of importance in the pathogenesis of colorectal cancer. Strains of this enigmatic bacterial species vary in their capacity to invade human epithelial cells, a virulence determinant which has important implications in disease. Here, we infected human colorectal epithelial (Caco-2) cells in vitro with a known, highly invasive strain of F. nucleatum isolated from a Crohns Disease patient, as well as a further invasive isolate of F. nucleatum derived from a colorectal cancer tumour. We used transcriptional profiling to determine the human genes upregulated during the invasion process compared to exposure to a non-invasive E.coli control strain. Infection with F. nucleatum strains resulted in the upregulation of several host genes, including two associated with tumorigenesis: dll4 and klf4.

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