Astrocytic glutamate transporter system (EAAT1/2)

The astrocytic glutamate transporter system, primarily comprising Excitatory Amino Acid Transporters 1 (EAAT1/GLAST) and 2 (EAAT2/GLT-1), is the essential mechanism for clearing the excitatory neurotransmitter glutamate from the synaptic cleft in the central nervous system (CNS) [2.2.1, 2.3.1]. These transporters are predominantly located on the perisynaptic processes of astrocytes, where they utilize the electrochemical gradients of sodium and potassium to sequester glutamate, thereby preventing its accumulation and subsequent excitotoxic damage to neurons [2.3.2, 3.2.4]. EAAT2 is the most abundant isoform, responsible for approximately 90% of all glutamate reuptake in the adult brain [2.1.2, 2.3.2]. Dysfunction or reduced expression of these transporters is strongly linked to the pathogenesis of neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS), Alzheimer's disease, and epilepsy [2.2.2, 3.1.1]. Therapeutic strategies targeting this system focus on upregulating transporter expression or activity through transcriptional and translational activators, such as ceftriaxone and LDN-212320 [2.2.1, 3.3.1]. Despite promising results in animal models, clinical translation has been hindered by challenges including systemic toxicity and the complexity of maintaining homeostasis across different brain regions [3.3.2, 3.3.3].

Other names

Excitatory amino acid transporter 1Excitatory amino acid transporter 2Glutamate-aspartate transporterGlutamate transporter 1GLASTGLT-1SLC1A3SLC1A2Glial glutamate transportersAstroglial glutamate transporters

Transcriptional activation of the SLC1A2 gene, translational activation of EAAT2 mRNA, enhancement of transporter surface expression and diffusion, and direct modulation of glutamate uptake activity.