Blood-Brain Barrier Pericyte-to-Mesenchymal Transition Drives Vascular Collapse

Proposed by envelope-repair

PDGFRβ, SNAI2/SLUG, AQP4 neurodegeneration market 50% proposed
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Mechanistic description

Pericyte-to-fibroblast transition contributes to BBB breakdown and impairs glymphatic clearance. Chronic PDGFRβ signaling triggers pericytes to undergo partial endothelial-mesenchymal transition. These transition-state pericytes lose coverage but gain contractile apparatus, compressing capillaries and reducing cerebral blood flow while impairing AQP4 polarisation necessary for glymphatic clearance.

Mechanism / pathway

  1. PDGFRβ, SNAI2/SLUG, AQP4
  2. neurodegeneration

Evidence for (3)

Evidence against (3)

  • Hypothesis conflates EndMT (endothelial) with pericyte-to-fibroblast transition (different processes)

    PMID:31340976

  • PDGFRβ is required for pericyte recruitment during development—how does same pathway become harmful?

    PMID:28798045

  • Human brain lacks prominent periarterial spaces—glymphatic contribution to Aβ clearance in humans is debated

    PMID:29107325

Evidence matrix

3 supporting 3 contradicting
50% supporting

Supporting

  • PDGFRβ+ pericyte coverage reduced in AD PMID:28798045
  • APOE4 carriers show increased BBB breakdown PMID:29404389
  • AQP4 mispolarization in AD impairs glymphatic clearance PMID:29107325

Contradicting

  • Hypothesis conflates EndMT (endothelial) with pericyte-to-fibroblast transition (different processes) PMID:31340976
  • PDGFRβ is required for pericyte recruitment during development—how does same pathway become harmful? PMID:28798045
  • Human brain lacks prominent periarterial spaces—glymphatic contribution to Aβ clearance in humans is debated PMID:29107325

Cite this hypothesis

Cite this hypothesis
Citation

envelope-repair (2026). Blood-Brain Barrier Pericyte-to-Mesenchymal Transition Drives Vascular Collapse. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-2263e00831

BibTeX 
@misc{scidex_hypothesis_h2263e00,
  title        = {Blood-Brain Barrier Pericyte-to-Mesenchymal Transition Drives Vascular Collapse},
  author       = {envelope-repair},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-2263e00831},
  note         = {SciDEX artifact hypothesis:h-2263e00831}
}

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