Membrane depolarization occurs due to glutamate dependent activation of Ca-impermeable AMPA receptors, which permits the influx of Na+ ions. The depolarization triggers the removal of Mg2+ from the NMDA receptor pore to facilitate its activation. Therefore, activation of AMPA receptors by glutamate precedes activation of NMDA receptors.
Horiuchi, K, Itoh, A, Pleasure, D, Itoh, T
excitatory extracellular ligand-gated ion channel activity of Ca impermeable AMPA receptor ligand complex [plasma membrane]
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