Sodium-coupled neutral amino acid transporter (SNAT)

Sodium-coupled neutral amino acid transporters (SNATs), primarily belonging to the SLC38 solute carrier family, are essential membrane proteins that mediate the uptake of small neutral amino acids such as glutamine, alanine, and serine [1, 4]. These transporters utilize the sodium electrochemical gradient to concentrate substrates within the cytoplasm, where they serve as critical precursors for protein synthesis, energy production, and the activation of the mTORC1 signaling pathway [6, 14]. In the context of oncology, SNATs (particularly SNAT1 and SNAT2) are frequently overexpressed to support the high metabolic demands of tumor cells, facilitating glutaminolysis and promoting rapid proliferation [2, 17]. Beyond cancer, SNATs play vital roles in neurotransmitter cycling between neurons and glia, as well as in hepatic gluconeogenesis and renal acid-base balance [2, 12]. Therapeutic development focuses on small-molecule inhibitors to starve cancer cells of vital nutrients, although achieving selectivity remains a challenge due to the widespread physiological expression of these transporters in the brain, liver, and muscle [16, 23].

Other names

SLC38 familySystem A transporterSystem N transporterSolute carrier family 38Sodium-dependent neutral amino acid transporterAmino acid transport system AAmino acid transport system N

Inhibition of sodium-dependent neutral amino acid uptake (primarily glutamine and alanine), which induces nutrient deprivation, suppresses the mTORC1 signaling pathway, and disrupts metabolic homeostasis in rapidly proliferating cells.