AMPA Receptors in Synaptic Plasticity, Memory Function, and Brain Diseases
Open accessAbstract
Tetrameric AMPA-type ionotropic glutamate receptors are primary transducers of fast excitatory synaptic transmission in the central nervous system, and their properties and abundance at the synaptic surface are crucial determinants of synaptic efficacy in neuronal communication across the brain. The induction of long-term potentiation (LTP) leads to the insertion of GluA1-containing AMPA receptors at the synaptic surface, whereas during long-term depression (LTD), these receptors are internalized into the cytoplasm of the spine. Disruptions in the trafficking of AMPA receptors to and from the synaptic surface attenuate both forms of synaptic plasticity. Homeostatic scaling up and scaling down, which are additional types of plasticity similar to LTP and LTD, are also regulated by the insertion and removal of GluA1-containing AMPA receptors from the synaptic surface. The trafficking of AMPA receptors is an intricate process assisted by various proteins. Furthermore, AMPA receptors are critical for the formation and consolidation of various types of memory, and alterations in their function are intimately associated with cognitive dysfunction in aging and several neurological and psychiatric diseases. In this review, we will provide an overview of the current understanding of how AMPA receptors regulate various forms of synaptic plasticity, their contribution to memory functions, and their role in aging and brain diseases.
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LTD involves dissociation of GluA1 subunits from the GluA1-TARP-(PSD-95) complex, followed by dephosphorylation of TARP by PP1 and dephosphorylation of GluA1 at S845, which collectively promote receptor endocytosis.
“This process involves the dissociation of GluA1 subunits from the GluA1-TARP-(PSD-95) complex, followed by dephosphorylation of TARP by protein phosphatase 1 (PP1) and dephosphorylation of GluA1 at the S845 site, which collectively promote receptor endocytosis [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The “GluA1-Containing AMPA Receptors in LTD” section supports the roles of PP1-mediated TARP dephosphorylation and GluA1 S845 dephosphorylation in receptor endocytosis. It does not support the claimed order: it says PP1 dephosphorylation disrupts the TARP–PSD-95 interaction, leading to GluA1 release, rather than following dissociation. (LLM, conf=0.87)
Experimental — accuracy not yet measuredPhosphorylation of GluA1 at S831 and TARPs enhances AMPAR single-channel conductance.
“This phosphorylation enhances AMPAR single-channel conductance and promotes their trapping at the synaptic surface, leading to synaptic strengthening [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
In “AMPA Receptors in Hebbian Forms of Plasticity,” the paper states that GluA1 S831 phosphorylation increases single-channel conductance. The same section says TARP phosphorylation facilitates trapping of GluA1-containing AMPA receptors at the synaptic surface, but does not say that TARP phosphorylation increases single-channel conductance. (LLM, conf=0.88)
Experimental — accuracy not yet measuredThe precise number, subtype, and localization of glutamate receptors at the postsynaptic membrane are dynamically regulated through complex trafficking mechanisms, which are crucial for synaptic plasticity and cognitive functions like learning and memory.
“The precise number, subtype, and localization of glutamate receptors at the postsynaptic membrane are dynamically regulated through complex trafficking mechanisms, which are crucial for synaptic plasticity and cognitive functions like learning and memory [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredCaMKII activated by calcium influx during LTP phosphorylates GluA1 at the S831 site and TARPs at S277 and S281 sites.
“Thus, CaMKII, activated by calcium influx during LTP, phosphorylates GluA1 at the S831 site and TARPs at S277 and S281 sites.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The ‘AMPA Receptors in Hebbian Forms of Plasticity’ section says LTP-induced calcium influx activates CaMKII, which phosphorylates GluA1 at S831 and auxiliary proteins including TARPs. It identifies S277 and S281 specifically as sites on TARPγ8, so the claim is broader than the source if ‘TARPs’ means the family generally. (LLM, conf=0.82)
Experimental — accuracy not yet measuredLTD is calcium-dependent, but typically involves a smaller or more prolonged calcium influx compared to LTP.
“Similar to LTP, LTD is also calcium-dependent, but typically involves a smaller or more prolonged calcium influx compared to LTP.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
In the ‘Ca2+-Permeable AMPA Receptors in LTP and LTD’ subsection (page not provided), the paper says a calcium-dependent phosphatase is essential for receptor endocytosis during LTD, supporting calcium involvement. It does not say that LTD typically involves a smaller or more prolonged calcium influx than LTP. (LLM, conf=0.84)
Experimental — accuracy not yet measured
The primary mechanism by which CaMKII mediates early LTP is through the phosphorylation of AMPARs and their auxiliary subunits, such as TARPs.
“The primary mechanism by which CaMKII mediates early LTP is through the phosphorylation of AMPARs) and their auxiliary subunits, such as TARPs.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The “AMPA Receptors in Hebbian Forms of Plasticity” section says CaMKII phosphorylates the GluA1 AMPAR subunit and auxiliary TARPs, linking both to LTP. It does not identify phosphorylation as CaMKII’s primary mechanism or specifically limit that account to early LTP. No page number is available in our copy. (LLM, conf=0.85)
Experimental — accuracy not yet measuredSynaptic strength is modified during long-term potentiation (LTP) and depression (LTD) through signaling cascades involving kinases like CaMKII, PKA, and PKC, or phosphatases such as PP1 and calcineurin.
“Synaptic strength is modified during long-term potentiation (LTP) and depression (LTD) through signaling cascades involving kinases like CaMKII, PKA, and PKC, or phosphatases such as PP1 and calcineurin.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The exocytosis of GluA1-containing AMPARs to the perisynaptic surface involves the motor protein Myosin Vb, which transports endosomes containing these receptors via Rab11 and its effector Rab11-FIP2.
“The exocytosis of GluA1-containing AMPARs to the perisynaptic surface involves the motor protein Myosin Vb, which transports endosomes containing these receptors via Rab11 and its effector Rab11-FIP2 [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
LTD is characterized by the removal of GluA1-containing AMPARs from the synaptic surface.
“Conversely, LTD is characterized by the removal of GluA1-containing AMPARs from the synaptic surface.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Liberated GluA2 subunits bind to PICK1, diffuse to the endocytic zone, and undergo clathrin-mediated endocytosis facilitated by interaction with the AP2 complex.
“The liberated GluA2 subunits then bind to PICK1, diffuse to the endocytic zone, and undergo clathrin-mediated endocytosis facilitated by interaction with the AP2 complex [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Arc plays a critical role in AMPAR endocytosis during LTD and homeostatic scaling down by having a higher affinity for dephosphorylated TARP and facilitating endocytosis via AP2 and endophilin.
“Arc (activity-regulated cytoskeleton-associated protein) plays a critical role in AMPAR endocytosis during LTD and homeostatic scaling down by having a higher affinity for dephosphorylated TARP and facilitating endocytosis via AP2 and endophilin [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Phosphorylation of GluA1 at S831 and TARPs promotes AMPAR trapping at the synaptic surface, leading to synaptic strengthening.
“This phosphorylation enhances AMPAR single-channel conductance and promotes their trapping at the synaptic surface, leading to synaptic strengthening [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The neuron precisely controls synaptic strength by fine-tuning the composition and number of AMPARs at the postsynapse through a complex, multi-faceted regulatory network.
“The detailed mechanisms involving different phosphorylation sites and interacting proteins (CaMKII, PKA, PKC, Myosin Vb, Protein 4.1N, SAP97, Arc, protein interacting with C kinase 1 (PICK1), adaptor protein-2 (AP2) complex) during exocytosis, lateral diffusion, and endocytosis highlight that the neuron precisely controls synaptic strength by fine-tuning the composition and number of AMPARs at the”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
AMPARs are tetrameric proteins typically composed of GluA1, GluA2, GluA3, and GluA4 subunits, with heterotetrameric combinations common in the adult brain.
“AMPARs are tetrameric proteins, typically composed of GluA1, GluA2, GluA3, and GluA4 subunits, with heterotetrameric combinations (e.g., GluA1/GluA2 or GluA2/GluA3) being common in the adult brain [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Protein 4.1N interacts with SynCAM1 and phosphorylated GluA1 (S818) to facilitate AMPAR recruitment and exocytosis.
“Protein 4.1N, abundant in dendritic spines, interacts with SynCAM1 and phosphorylated GluA1 (S818) to facilitate AMPAR recruitment and exocytosis [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
GluA1-containing AMPARs undergo lateral diffusion through the membrane to enter the postsynaptic density, where their retention is facilitated by interactions with PSD-95 via TARPs.
“These receptors then undergo lateral diffusion through the membrane to enter the postsynaptic density (PSD), where their retention is facilitated by interactions with PSD-95 via transmembrane AMPA receptor regulatory proteins (TARPs) [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
During LTP induction, GluA1-containing AMPARs are rapidly incorporated into the synaptic surface of excitatory synapses.
“During LTP induction, GluA1-containing AMPARs are rapidly incorporated into the synaptic surface of excitatory synapses.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
GluA2 subunits are internalized during LTD via PKCα-mediated phosphorylation at the S880 site, which disrupts their binding to GRIP1.
“GluA2 subunits are also internalized during LTD, a process involving PKCα-mediated phosphorylation at the S880 site, which disrupts their binding to GRIP1.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Internalized AMPARs can either be recycled back to the surface during subsequent LTP or degraded in lysosomes during LTD.
“Internalized receptors can either be recycled back to the surface during subsequent LTP or degraded in lysosomes during LTD.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The differential calcium signal in LTD activates protein phosphatases, such as protein phosphatase 1 (PP1) and calcineurin (protein phosphatase 2B), which dephosphorylate key synaptic proteins.
“This differential calcium signal activates protein phosphatases, such as protein phosphatase 1 (PP1) and calcineurin (protein phosphatase 2B), which dephosphorylate key synaptic proteins [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Other kinases, such as protein kinase A and protein kinase C, also contribute to AMPAR trafficking during LTP.
“Other kinases, such as protein kinase A (PKA) and protein kinase C (PKC), also contribute to AMPAR trafficking during LTP.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
CaMKII phosphorylates TARPs, enhancing the retention of GluA1-containing AMPARs within the PSD by forming a GluA1-TARP-(PSD-95) complex.
“CaMKII also phosphorylates TARPs, enhancing the retention of GluA1-containing AMPARs within the PSD by forming a GluA1-TARP-(PSD-95) complex.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
A primary mechanism of LTD involves the removal of AMPA receptors from the postsynaptic membrane.
“A primary mechanism of LTD involves the removal of AMPA receptors from the postsynaptic membrane.”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
Gi/o-mediated pathways, such as those activated by the purinergic P2Y12 receptor, provide a critical break on release probability and coordinate microglial-synapse interactions during circuit refinement.
“Furthermore, Gi/o-mediated pathways, such as those activated by the purinergic P2Y12 receptor, provide a critical break on release probability and coordinate microglial-synapse interactions during circuit refinement [1,12,45,46].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The Introduction (page not provided) discusses G-protein signaling by metabotropic glutamate receptors, but not Gi/o-mediated inhibition of release probability. Searches for P2Y12, microglial–synapse interactions, and circuit refinement found no passage addressing the attributed claim. (LLM, conf=0.75)
Experimental — accuracy not yet measuredA complete and unified understanding of how synaptic vesicle recycling is controlled as a whole remains elusive.
“While various endocytic pathways have been identified, a complete and unified understanding of how synaptic vesicle recycling is controlled as a whole remains elusive [45].”
From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [45]
The section on proteins implicated in AMPA receptor trafficking during LTP and LTD describes postsynaptic receptor movement and mentions a synaptic vesicle protein, but does not address whether control of synaptic vesicle recycling is understood as a whole. A search for synaptic vesicle recycling and endocytic pathways found no passage making the attributed point. (LLM, conf=0.74)
Experimental — accuracy not yet measured
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- Authors
- de León-López, C. A. M., Carretero-Rey, M., & Khan, Z. U.
- Affiliations
- Instituto de Salud Carlos III (ES)
- Corresponding author
- Khan, Zafar U.
- ORCID
- Khan, Zafar U.
- Venue
- Cellular and Molecular Neurobiology
- Published
- 2025-01-22
- Volume
- 45
- Issue
- 1
- Pages
- 14-14
- ISSN
- 0272-4340 (ISSN-L)
- 1573-6830
- PMC
- PMC11754374
- OpenAlex
- W4406726334
- Cited by
- 73
- References
- 186
- Citations by year
- 2026: 49 · 2025: 24
- FWCI
- 8.80
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Cellular and Molecular Neurobiology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Repositorio Institucional de la Universidad de Málaga (University of Málaga) (submittedVersion, cc-by)
- Funders
- Ministerio de Ciencia, Innovación y Universidades, Spain (PID2022-136954OB-I00)
- Junta de Andalucía, Spain (PROYEXCEL-00422)
- Fondo Europeo de Desarrollo Regional , EU (CTS-586-G-FEDER)
- Universidad de Málaga
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
- Keywords
- AMPA receptors, GluR1, synaptic plasticity, long-term potentiation, long-term depression, homeostatic synaptic scaling, receptor trafficking, synaptic homeostasis, memory formation, memory consolidation, cognitive aging, neurological disorders, mental illness, ionotropic glutamate receptors
- MeSH terms
- Animals, Brain Diseases, Humans, Memory, Neuronal Plasticity, Synapses, Receptors, AMPA
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