• PDK4 is upregulated in mesothelial cells undergoing MMT in CRC peritoneal metastasis.
• PDK4 promotes mesothelial cell invasion via increased fatty acid oxidation.
• PDK4 enhances β-catenin acetylation, which is critical for mesothelial cell invasion.
• Targeting PDK4 or FAO may offer therapeutic strategies to inhibit CRC peritoneal metastasis.
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