Metabolic symbiosis and competition: the dual nature of TAM-tumor cell cross-talk in tumor progression

Cancer cells and tumor associated macrophages (TAMs) engage in a sophisticated metabolic symbiosis within the tumor microenvironment (TME), where reciprocal metabolite exchange drives immune evasion and malignant progression. This review posits that TAMs functional plasticity is not merely a consequence but a driver of tumor fitness, governed by extensive metabolic rewiring. We dissect the mechanistic underpinnings of this "metabolic dialogue," focusing on the convergence of glycolytic flux, the lactate shuttle, amino acid catabolism, lipid reprogramming, hypoxia-induced adaptations, and TCA cycle anaplerosis. Beyond delineating these pathways, we critically evaluate emerging therapeutic paradigms that target these metabolic nodes, advocating for precision interventions capable of disrupting this pro-tumorigenic alliance while restoring immune surveillance.