Upregulated FSP1 by GPD1/1L Mediated Lipid Droplet Accumulation Enhances Ferroptosis Resistance and Peritoneal Metastasis in Gastric Cancer

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Abstract
To successfully metastasize, cancer cells must evade detachment induced cell death, known as anoikis. Unraveling the mechanisms that gastric cancer (GC) circumvent anoikis and achieve peritoneal metastasis especially during unanchored growth, could significantly improve patient outcomes. Our study reveals that GC cells exhibit increased lipid peroxidation, MDA production, and cell death during suspension culture, which can be mitigated by the intervention with liproxstatin-1 and ferrostatin-1. We discovered that oleic acid (OA) or adipocytes stimulate lipid accumulation in GC cells, thereby inhibiting lipid peroxidation and cell death. Lipid mass spectrometry confirmed an upregulation of triglyceride synthesis, indicating that the accumulation of lipid droplet may confer resistance to ferroptosis during suspension growth. In vitro assays demonstrated that OA not only induces lipid droplet accumulation but also upregulates the expression of ferroptosis suppressor protein 1 (FSP1), a process that can be abrogated by the double knockout of GPD1/1L genes. Additionally, we have demonstrated that a decrease in the ubiquitination of FSP1 in GC cells upon lipid droplet accumulation, as well as silencing or pharmacological targeting FSP1, promotes ferroptosis and disrupts the peritoneal metastatic potential of GC cells. Collectively, our findings highlight the potential of FSP1 as a promising therapeutic target for metastatic gastric cancer.

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