Glutamatergic Pathways in Alzheimer’s Disease

Alzheimer’s disease (AD) is marked by progressive synaptic dysfunction and neuronal loss driven in large part by disturbances in glutamatergic signalling. Central to excitatory neurotransmission are AMPA and NMDA receptors, whose coordinated activity underpins synaptic plasticity, learning and memory. In AD, soluble amyloid-β oligomers and hyperphosphorylated tau impair receptor trafficking, alter subunit composition and disrupt glutamate uptake by astrocytes, leading to excessive activation of extrasynaptic NMDA receptors. The resulting Ca2+ overload triggers downstream kinase cascades, mitochondrial compromise and excitotoxic injury. At the same time, diminution of synaptic receptor function undermines long-term potentiation and network connectivity. Therapeutic strategies that rebalance synaptic versus extrasynaptic receptor activity, enhance glutamate clearance or stabilise receptor localisation hold promise for slowing cognitive decline and modifying disease progression.

Research from Nature Portfolio

One foundational investigation revealed that intracellular amyloid-β oligomers rapidly induce the synaptic insertion of Ca2+-permeable AMPA receptors through PKA-dependent phosphorylation of the GluA1 subunit. This postsynaptic response precedes overt synaptic loss, emphasising the importance of early receptor trafficking disturbances in Alzheimer’s pathology and identifying AMPA receptor modulation as a potential therapeutic entry point.

Glutamatergic Pathways in Alzheimer’s Disease publication trend

The graph below shows the total number of articles in glutamatergic pathways in alzheimer’s disease across all publications each year (not limited to Nature Index journals).

Technical terms

Amyloid-β oligomer: Soluble aggregates of the Aβ peptide implicated in receptor dysregulation and synaptic toxicity.

AMPA receptor (AMPAR): Ionotropic glutamate receptor mediating fast excitatory synaptic transmission.

NMDAR: N-methyl-D-aspartate receptor, a glutamate-gated ion channel essential for Ca2+-dependent synaptic plasticity.

Extrasynaptic receptor: Receptors located outside the synaptic cleft that, when overactivated, mediate neurotoxic signalling.

Excitotoxicity: Neuronal injury or death resulting from excessive activation of excitatory receptors and Ca2+ overload.

Tripartite synapse: Functional unit comprising presynaptic and postsynaptic elements together with surrounding astrocytic processes that regulate neurotransmitter clearance.

References

1. Extrasynaptic NMDA receptors in acute and chronic excitotoxicity: implications for preventive treatments of ischemic stroke and late-onset Alzheimer’s disease. Molecular Neurodegeneration (2023).
2. Astrocytic Hevin/SPARCL‐1 Regulates Cognitive Decline in Pathological and Normal Brain Aging. Aging Cell (2025).
3. Intracellular oligomeric amyloid-beta rapidly regulates GluA1 subunit of AMPA receptor in the hippocampus. Scientific Reports (2015).
4. The Dual Role of Glutamatergic Neurotransmission in Alzheimer’s Disease: From Pathophysiology to Pharmacotherapy. International Journal of Molecular Sciences (2020).