A recent review highlights amino acid sensors as central regulators linking nutrient availability to tumor adaptation. By coordinating metabolic homeostasis, epigenetic remodeling, antitumor immunity, and redox balance, amino acid-sensing networks support tumor growth, plasticity, and immune evasion. Targeting these sensing pathways may expose metabolic vulnerabilities and provide new opportunities for combination cancer therapy.
Cancer progression is shaped by genetic alterations, metabolic reprogramming, and microenvironmental stress. Amino acids are not only substrates for energy production and macromolecular synthesis, but also signaling molecules that regulate metabolism, cell fate, and immunity. This review summarizes how amino acid sensors translate nutrient availability into signaling programs that support tumor adaptation.
mTORC1 and GCN2 are two conserved nutrient-sensing pathways that coordinate cell growth, protein synthesis, autophagy, and energy metabolism. In cancer, these circuits are frequently rewired, enabling continued growth or chronic stress adaptation under nutrient limitation. Amino acid sensing also reshapes epigenetic states, immune-cell function, and redox homeostasis, linking nutrient status to tumor plasticity, immune evasion, and treatment resistance.
Key highlights include:
Metabolic adaptation: Leucine, arginine, threonine, and other amino acid sensors converge on mTORC1 and related pathways to coordinate anabolic metabolism, autophagy, and tumor growth.
Epigenetic and immune regulation: Amino acid availability influences chromatin remodeling and establishes nutrient competition between tumor and immune cells, thereby affecting cellular plasticity and antitumor immunity.
Therapeutic opportunities: Dietary amino acid restriction and direct targeting of amino acid sensors or binding proteins offer complementary strategies to exploit tumor metabolic vulnerabilities.
Representative sensors include Sestrin2, SAR1B and LARS1 for leucine; CASTOR1 and SLC38A9 for arginine; TARS2 for threonine; SAMTOR and PRMT1 for methionine-derived SAM; AHR and GCN2 in immune and stress responses; and PKM2 and cysteine-responsive pathways in redox control.
Therapeutically, dietary restriction of methionine, serine/glycine, or branched-chain amino acids can suppress tumor growth in selected settings, while direct targeting of sensors or amino acid-binding proteins may offer greater selectivity. Because nutrient limitation can also impair immune cells, the authors emphasize evaluating both tumor-intrinsic effects and the net immune consequences of intervention.
Future studies should resolve less-defined sensing mechanisms and the spatial heterogeneity of nutrient availability in tumors. Combining single-cell omics, spatial metabolomics, and functional tracing may support more precise strategies that target amino acid sensing while preserving antitumor immunity.
Citation: Shi X, Wang R, Zhao S. Amino acid sensors as key regulators of tumor biology. Adv. Cancer Res. 2026(2):0012. https://www.elspub.com/doi/10.55092/acr20260012
Advanced Cancer Research
Experimental study
Cells
Amino acid sensors as key regulators of tumor biology
21-Aug-2026