EAAT2

The excitatory amino acid transporter 2 (EAAT2) serves as the primary glutamate transporter in the human central nervous system, regulating extracellular glutamate concentrations and maintaining excitatory-inhibitory homeostasis[1]. Mechanistically, EAAT2 clears synaptic glutamate by uptake into astrocytes, facilitating recycling through glutamine synthesis[1]. Compared with related isoforms, such as EAAT1, EAAT2 exhibits higher expression in cortical and hippocampal astrocytes and displays greater transport capacity for excitatory neurotransmission[1]. Dysregulation of EAAT2 expression or localization contributes to neurodegenerative processes, with experimental models of Alzheimer's disease demonstrating altered EAAT2 distribution and correlation with cognitive deficits[1]. EAAT2-specific agonists or modulators have been employed in preclinical studies to restore glutamate homeostasis, providing neuroprotective effects and highlighting potential translational applications[1]. Therefore, EAAT2 functions as a key molecular target for studying synaptic excitatory control, neurodegeneration, and pharmacological modulation of glutamatergic signaling in disease-relevant contexts[1].