SNX10 Is Involved in Ovarian Cancer Cell Metastasis by Repolarizing Tumor-Associated Macrophages Through mTOR1/Lysosomes Pathway

<b>Background:</b> Tumor-associated macrophages (TAMs) are prevalent in advanced ovarian cancer tissues and ascites, significantly influencing disease prognosis. However, the mechanisms driving TAM polarization and their tumor-promoting effects remain poorly understood. <b>Methods</b>: The subcellular distribution of SNX10 in ovarian cancer tissues was analyzed using single-cell datasets (GSE147082, GSE58937). The Kaplan-Meier Plotter and GEPIA2 databases were used to evaluate SNX10's prognostic relevance. Lentivirus-mediated <i>SNX10</i> overexpression in THP-1 cells was employed in tumor cell-macrophage co-culture experiments. Transwell assays and flow cytometry assessed SNX10's effects on ovarian cancer cell metastasis and cisplatin-induced apoptosis. RNA sequencing, Western blotting, lysosomal pH detection, lipid droplet staining, and RT-qPCR were performed to explore SNX10's molecular mechanisms in TAM polarization and immune modulation. <b>Results</b>: SNX10 was specifically expressed in TAMs, promoting their polarization into the M2 phenotype. This enhanced the migration and invasion of ovarian cancer cell lines A2780 and A2780/CP70 while reducing cisplatin-induced apoptosis. SNX10 decreased lipid droplet content, downregulated p-mTOR1, and impaired lysosomal function in TAMs. Additionally, SNX10 differentially modulated <i>PD-L1</i> mRNA expression in platinum-sensitive and platinum-resistant ovarian cancer cells. <b>Conclusions</b>: SNX10 regulates the mTOR1/lysosome pathway in TAMs, influencing lipid metabolism and indirectly modulating ovarian cancer cell metastasis. It also alters <i>PD-L1</i> mRNA expression, suggesting a role in shaping the tumor immune microenvironment.