Evodiamine Inhibits Colorectal Cancer by Downregulating ASS1 via Wnt/β-Catenin/c-MYC Pathway to Block Arginine Synthesis.

Background: Argininosuccinate synthase 1 (ASS1), a key enzyme in arginine biosynthesis, is highly expressed in colorectal cancer (CRC) and promotes cancer progression, making it a potential therapeutic target. Evodiamine (EVO), a natural alkaloid from Evodia rutaecarpa acts as a novel Wnt signaling pathway inhibitor with strong anticancer activity against various cancers. However, its exact therapeutic mechanism in CRC remains unclear. Methods: To address this gap, experiments included enzyme-linked immunosorbent assay (ELISA) to test EVO's effect on CRC arginine production; CCK-8, EdU, colony formation, and wound-healing assays to assess CRC cell proliferation and migration; RT-qPCR, Western blot, immunofluorescence (IF), and ShASS1 for mechanism exploration and target validation; and a syngeneic tumor allograft model to study EVO's metabolic regulation and anticancer efficacy in CRC. Results: In vitro, EVO significantly inhibited arginine synthesis metabolism and reduced CRC cell proliferation/migration. In vivo, it suppressed tumor tissue arginine metabolism, slowed allograft tumor growth, and decreased ASS1 expression. Mechanistically, EVO concentration-dependently reduced ASS1 via the Wnt/β-catenin/c-MYC pathway; ShASS1 replicated EVO's anticancer effects, confirming ASS1's mediating role. Conclusions: EVO downregulates ASS1 via the Wnt/β-catenin/c-MYC pathway disrupts CRC arginine synthesis metabolism and inhibits CRC cell proliferation/migration. These results support the interaction between metabolic regulation and signaling pathways, highlighting EVO as a promising CRC therapeutic candidate.