Amino acid and glutathione transporters on human brain endothelial cells

The amino acid and glutathione transporters on human brain endothelial cells are a specialized group of membrane proteins that facilitate the movement of essential nutrients and antioxidants across the blood-brain barrier (BBB) (Abbott et al., 2010, Neurobiol Dis). Key members include the Large Neutral Amino Acid Transporter 1 (LAT1/SLC7A5), which facilitates the entry of essential amino acids like leucine, and various glutathione (GSH) transport systems, including Multidrug Resistance-associated Proteins (MRPs) (Puris et al., 2020, Pharmaceutics). These transporters are critical for maintaining brain homeostasis and providing antioxidant defense through GSH delivery (Rip et al., 2009, J Drug Target). In pharmacology, these transporters are primarily targeted to overcome the restrictive nature of the BBB, allowing for the delivery of small molecule drugs and nanocarriers into the central nervous system (Gaillard et al., 2014, J Control Release). For example, LAT1 is exploited to transport prodrugs like Levodopa, while GSH transporters are utilized in specialized liposomal delivery systems like 2B3-101 to enhance brain penetration (Puris et al., 2020, Pharmaceutics). Understanding the expression and kinetics of these transporters is vital for developing effective treatments for neurodegenerative diseases and brain tumors. These systems operate via carrier-mediated transport, where drugs designed to mimic endogenous substrates are shuttled into the brain parenchyma. However, therapeutic strategies must account for the potential competition with natural substrates and the high degree of transporter specificity.

Other names

Blood-brain barrier transportersBBB amino acid transport systemBBB glutathione transport systemCarrier-mediated transport systemsSLC7A5 and GSH transport systems

Carrier-mediated transport (CMT) across the blood-brain barrier via substrate mimicry or ligand-targeted nanocarriers.