ArticleProceedings of the National Academy of Sciences of the United States of America2025
Astrocytic EphA4 signaling is important for the elimination of excitatory synapses in Alzheimer's disease.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Integrated multi-omics analysis identifies potential therapeutic targets for Alzheimer's disease.Neural regeneration research · 2026Article
- Perisynaptic Astrocytic Processes as Communication Hubs and Early Sites of Dysfunction.The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry · 2026Review
- Repurposing trazodone for Alzheimer's disease to modulate soluble ST2 levels and alleviate Alzheimer's pathology.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Neurexins, Ephrin receptors, and N-cadherin signaling as emerging mechanisms in synaptic dysfunction and neurodegenerative diseases.Communications biology · 2026Review
- Cerebrospinal Fluid Proteome Reveals Dysregulation of Lysosomal and Axonal Proteins in Neurosyphilis.Journal of proteome research · 2026Article
- After Traumatic Brain Injury, EPHA4 Enhances Endoplasmic Reticulum Stress to Promote M1 Microglial Polarization Through the MAPK Signaling Pathway.Mediators of inflammation · 2026Article
- Astrocyte-Mediated Plasticity: Multi-Scale Mechanisms Linking Synaptic Dynamics to Learning and Memory.Cells · 2025Review
- Increased levels of GFAP and purinergic P2X7 receptor in Alzheimer's disease brain are associated with Aβ, tau pathologies and synaptic loss.Alzheimer's research & therapy · 2025Article
- Astrocytes as Therapeutic Targets in Neurodegenerative Disorders.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025Review
- Early Locus Coeruleus noradrenergic axon loss drives olfactory dysfunction in Alzheimer's disease.Nature communications · 2025Article
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Authors and funding
8 authors.
Funding
Abstract
Cell surface receptors, including erythropoietin-producing hepatocellular A4 (EphA4), are important in regulating hippocampal synapse loss, which is the key driver of memory decline in Alzheimer's disease (AD). However, the cell-specific roles and mechanisms of EphA4 are unclear. Here, we show that EphA4 expression is elevated in hippocampal CA1 astrocytes in AD conditions. Specific knockout of astrocytic EphA4 ameliorates excitatory synapse loss in the hippocampus in AD transgenic mouse models. Single-nucleus RNA sequencing analysis revealed that EphA4 inhibition specifically decreases a reactive astrocyte subpopulation with enriched complement signaling, which is associated with synapse elimination by astrocytes in AD. Importantly, astrocytic EphA4 knockout in an AD transgenic mouse model decreases complement tagging on excitatory synapses and excitatory synapses within astrocytes. These findings suggest an important role of EphA4 in the astrocyte-mediated elimination of excitatory synapses in AD and highlight the crucial role of astrocytes in hippocampal synapse maintenance in AD.
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