Fatty acid synthase regulates invasion and metastasis of colorectal cancer via Wnt signaling pathway.

Fatty acid synthase (Fasn) is the key metabolic enzyme that accounts for the terminal catalytic step in fatty acid synthesis, which is hyperactivated in various tumors. In this study, we depicted that Fasn expression was elevated in human colorectal cancer (CRC), which accordingly led to lymphatic and distant metastasis and a more advanced clinical phenotype. Genetic perturbations demonstrated that knocking down Fasn inhibited cell migration and invasion both in SW480 and HT29 CRC cell lines. Further mechanical exploration revealed that Fasn knockdown could attenuate Wnt signaling pathway via downregulating distinctive genes, namely Wnt5a, Wnt5b, Fzd2, which at least partly contributed to the decrease in metastasis. Clinical evidence verified a positive correlation between Fasn expression and Wnt signal marker gene expression in a cohort of 43 CRC patients. In conclusion, we shed light on metabolic switches took place during CRC carcinogenesis, among which Fasn is a critical factor and a potential therapeutic target.