AMPA-type glutamate receptor (with transmembrane AMPA receptor regulatory protein gamma-8) (AMPAR (with TARP γ-8))

AMPA-type glutamate receptors are ionotropic receptors that mediate the majority of fast excitatory neurotransmission in the brain by allowing cation influx in response to glutamate binding[1][2][6]. Their function is critically regulated by auxiliary subunits called transmembrane AMPA receptor regulatory proteins (TARPs), among which gamma-8 (TARP γ-8, encoded by CACNG8) is highly expressed in the hippocampus and cortex[4][6]. TARP γ-8 tightly modulates AMPAR gating kinetics, ion conductance, and synaptic localization, and enables receptor subtype selectivity for new small-molecule therapeutics[3][5][6]. The AMPA receptor/TARP γ-8 complex is an emerging target in epilepsy, pain disorders, and psychiatric diseases due to its unique expression pattern and physiological roles in emotion and cognition[3][4][5]. Selective pharmacological modulators of this complex are under development and have shown therapeutic potential but must be balanced against risks of impairing synaptic plasticity and normal excitatory signaling[3][5][6].

Other names

AMPA receptor/TARP gamma-8 complexGluA1/2–TARP γ-8 complexAMPAR–TARP γ-8 complexTARP γ-8 (gene symbol: CACNG8)AMPA-type glutamate receptor (with auxiliary TARP γ-8)GluA (with TARP γ-8)Transmembrane AMPA receptor regulatory protein gamma-8

Negative allosteric modulation (NAM) of AMPA receptor function via TARP γ-8 interaction, alters gating kinetics and ion conductance; Stabilization or destabilization of AMPAR open or closed conformations through TARP γ-8 binding, affecting synaptic activity; Regulation of channel rectification and ion permeability by TARP subunit