Other glutamine transport systems

Other glutamine transport systems refers to a diverse group of solute carrier (SLC) proteins that facilitate the movement of the amino acid glutamine across cellular membranes, excluding the frequently cited primary target SLC1A5 (ASCT2) [1, 4]. This group primarily includes members of the SLC38 family (System A and System N transporters like SNAT1, SNAT2, SNAT3, and SNAT5) and the SLC7 family (System L and System y+L transporters like LAT1 and LAT2) [1, 2]. These systems are critical for maintaining intracellular glutamine levels, which support metabolic processes such as the TCA cycle, nucleotide synthesis, and the activation of the mTORC1 growth-signaling pathway [4, 5]. In the central nervous system, they play a vital role in the glutamate-glutamine cycle, mediating the exchange of glutamine between astrocytes and neurons to sustain neurotransmission [2]. Because many cancer cells exhibit glutamine addiction, these alternative transport systems are often upregulated to compensate for increased metabolic demands, making them attractive therapeutic targets [3, 5]. Pharmacological inhibition of these systems, such as with LAT1-specific inhibitors like JPH203, aims to starve tumor cells of essential nutrients and inhibit proliferation [3].

Other names

System A transportersSystem N transportersSystem L transportersSystem y+L transportersSNATsLATsSLC38 familySLC7 familySLC6A14SLC6A19

Competitive inhibition of sodium-dependent and sodium-independent amino acid transporters, leading to the depletion of intracellular glutamine pools and the suppression of glutamine-dependent metabolic and signaling pathways.