Prominent cellular metabolic adaptations in pancreatic ductal adenocarcinoma tumor microenvironment
Pancreatic ductal adenocarcinoma (PDAC) represents a highly aggressive cancer with a dismal prognosis and a 5-year survival rate of approximately 12%. The poor clinical outcomes are attributed to multiple factors, including difficulty in early detection, rapid metastasis, and intrinsic resistance to therapies. The tumor microenvironment of PDAC exhibits immunosuppressive features, nutrient-deprived conditions, and metabolic reprogramming. These factors collectively contribute to immune evasion and therapeutic resistance. Notably, metabolic reprogramming has emerged as a well-recognized hallmark of PDAC in both cancer cells and the surrounding milieu. Several key metabolic pathways are extensively rewired to support tumor growth, survival, and progression. In addition, accumulating evidence highlights critical metabolic crosstalk between cancer cells and various components of the TME, including cancer-associated fibroblasts, tumor-associated macrophages, tumor-associated neutrophils, regulatory T cells, and the intratumoral microbiota. These metabolic interactions profoundly influence tumor biological behavior and therapeutic response. We aim to provide a comprehensive synopsis of recent advances regarding cellular metabolic adaptations in the PDAC tumor microenvironment, including glycolysis, glutamine and lipid metabolism, macropinocytosis, and autophagy. We delineate the multiscale metabolic interplays within the tumor–stroma symbiosis and highlight promising therapeutic strategies targeting metabolic vulnerabilities. We also discuss energy metabolism-associated post-translational modifications, such as lysine lactylation and acetylation. In this review, we focus on metabolic interactions among tumor cells, anti-tumor cells, and immunosuppressive cells, with an emphasis on recent technological advances, including single-cell sequencing, spatial multi-omics, and artificial intelligence.
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