Gasdermin D通过诱导LAMC2降解阻断M2巨噬细胞极化来拮抗前列腺癌中的免疫抑制

Abstract

Background The N-terminal domain of gasdermin D (GSDMD) is a known suppressor of prostate cancer (PCa), primarily recognized for its tumoricidal pyroptotic function. However, research on the full-length GSDMD protein and its relationship with PCa remains unexplored. Therefore, the aim of this study was to investigate the potential non-pyroptotic mechanism of action of GSDMD in preventing PCa immune evasion. Methods The study used GSDMD deletion models to assess its impact on tumor progression and immune cell profiles. Molecular techniques, including protein interaction analysis, were employed to identify the binding partner of GSDMD and the subsequent signaling pathways. Correlative analysis was performed between GSDMD expression and immune markers in human PCa samples. Results GSDMD deletion increased tumor progression and reduced survival, cytotoxic T lymphocyte (CTL) activation/infiltration and tumor cell susceptibility to T-cell death, promoting an immunosuppressive tumor microenvironment (TME). GSDMD-bound laminin subunit gamma-2 (LAMC2), thus inducing its ubiquitin-mediated degradation. Consequently, GSDMD deficiency stabilized LAMC2, driving M2 macrophage polarization and CXC motif chemokine ligand 5 (CXCL5) secretion. CXCL5 interacted with CXCR2 to activate the AKT/NF-κB axis, increasing vascular endothelial growth factor (VEGF)/vascular endothelial growth factor receptor 2 (VEGFR2) and suppressing CTL activity. GSDMD expression in human PCa positively correlated with CD8 + T-cell infiltration and negatively with M2-phenotype tumor-associated macrophages. Conclusion This study reveals a novel non-pyroptotic pathway through which GSDMD inhibits PCa immune evasion by targeting LAMC2 for degradation, thereby preventing the establishment of an immunosuppressive TME. The findings suggest that activating GSDMD represents a promising therapeutic strategy to reprogram the TME from immunosuppressive (“cold”) to immunoreactive (“hot”), potentially enhancing the