Amino acid metabolism at the senescence–cancer interface

Amino acid (AA) metabolism plays a fundamental role in the regulation of cellular senescence. Through profound AA metabolic reprogramming, senescent stromal cells can sustain tumor progression, metastatic dissemination, and the establishment of an immunoevasive microenvironment. Conversely, alterations in AA availability within the tumor microenvironment can enforce tumor-suppressive senescence in malignant cells. In this review, we discuss how senescence-driven rewiring of AA metabolism shapes tumor-stroma interactions and immune responses. We propose that AA-targeted interventions may represent an effective therapeutic strategy to simultaneously mitigate the detrimental effects of stromal senescence while inducing tumor-suppressive senescence in cancer cells.