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Spatial Transcriptomics and Dual Dye Mapping Identify Wnt-Driven BBB Protection in Endothelial EphA4-Deficiency.

Caroline de Jager1, Jing Ju1, Marco Corbo1

  • 1Virginia Tech.

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|April 17, 2026
PubMed
Summary
This summary is machine-generated.

Traumatic brain injury (TBI) causes blood-brain barrier (BBB) leakage. EphA4 gene deletion protects BBB integrity, and Wnt signaling activation reduces injury, offering new TBI treatment strategies.

Keywords:
Eph signalingblood-brain barrier (BBB)brain microvasculatureneuroprotectionspatial transcriptomicstraumatic brain injury (TBI)

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biomedical Engineering

Background:

  • Blood-brain barrier (BBB) disruption is a critical consequence of traumatic brain injury (TBI).
  • The precise molecular mechanisms and spatial dynamics of BBB permeability post-TBI are not fully understood.
  • Understanding these dynamics is crucial for developing effective TBI therapies.

Purpose of the Study:

  • To investigate the temporal and spatial characteristics of BBB permeability after controlled cortical impact (CCI) injury.
  • To explore the role of EphA4 in regulating BBB integrity following TBI.
  • To identify molecular pathways, such as Wnt signaling, involved in BBB protection and repair after TBI.

Main Methods:

  • Development of a dual dye-labeling system using Evans Blue Dye (EBD) and sodium fluorescein (NaFl) to assess BBB permeability.
  • Utilizing EphA4 conditional knockout (KO) mice and wild-type (WT) littermates subjected to CCI.
  • Integration of spatial transcriptomics with dye quantification to analyze gene expression changes in the injured brain.

Main Results:

  • Distinct temporal patterns of BBB leakage were observed for NaFl (7 days) and EBD (4 days) post-CCI.
  • EphA4 deletion in endothelial cells (ECs) significantly enhanced BBB integrity.
  • EphA4 EC ablation upregulated key BBB-related genes (e.g., Tjp2, Cldn1) and neuroprotective genes (e.g., Nr4a1).
  • Wnt signaling pathway genes were upregulated in KO mice, and Wnt pathway activation via Frizzled-4 (FZD4) agonist FZM1.8 reduced lesion volume and BBB disruption.

Conclusions:

  • Spatial transcriptomics and dual-dye labeling are effective tools for studying TBI-induced BBB disruption.
  • EphA4 signaling plays a significant role in regulating BBB integrity post-TBI.
  • The Wnt signaling pathway represents a promising therapeutic target for mitigating secondary brain injury and promoting BBB repair following TBI.