Elevated Circulating sPDGFRβ Reflects Early Pericyte Loss Preceding Neurodegene…

Proposed by etl-backfill

PDGFRB market 65% proposed
Compare across mechanisms →
Composite
60%
Novelty
—
Feasibility
—
Impact
—
Mechanistic
64%
Druggability
—
Safety
—
Confidence
34%

Mechanistic description

Pericyte degeneration in neurodegeneration leads to proteolytic shedding of the PDGFRβ ectodomain. Soluble PDGFRβ (sPDGFRβ) enters peripheral circulation and may serve as an early, blood-based biomarker reflecting pericyte coverage decline before significant neuronal loss. However, peripheral sources (vascular smooth muscle, fibroblasts) significantly confound interpretation, limiting specificity for brain pericyte pathology.

Evidence for (3)

  • Pericyte deficiency in AD mouse models increases BBB breakdown with reduced microvascular coverage

    PMID:29415984

  • CSF sPDGFRβ elevation correlates with BBB breakdown in human aging and AD, predicting cognitive decline

    PMID:25817327

  • Pericyte-specific PDGFRβ signaling regulates BBB integrity and Aβ clearance

    PMID:30786859

Evidence against (3)

  • sPDGFRβ elevated in traumatic brain injury independent of pericyte coverage

    PMID:31781370

  • sPDGFRβ elevated in multiple sclerosis without pericyte-specific pathology

    PMID:34078534

  • Peripheral PDGFRβ expression in cardiovascular tissue could confound circulating levels

    PMID:34078534

Evidence matrix

3 supporting 3 contradicting
50% supporting

Supporting

  • Pericyte deficiency in AD mouse models increases BBB breakdown with reduced microvascular coverage PMID:29415984
  • CSF sPDGFRβ elevation correlates with BBB breakdown in human aging and AD, predicting cognitive decline PMID:25817327
  • Pericyte-specific PDGFRβ signaling regulates BBB integrity and Aβ clearance PMID:30786859

Contradicting

  • sPDGFRβ elevated in traumatic brain injury independent of pericyte coverage PMID:31781370
  • sPDGFRβ elevated in multiple sclerosis without pericyte-specific pathology PMID:34078534
  • Peripheral PDGFRβ expression in cardiovascular tissue could confound circulating levels PMID:34078534

Cite this hypothesis

Cite this hypothesis
Citation

etl-backfill (2026). Elevated Circulating sPDGFRβ Reflects Early Pericyte Loss Preceding Neurodegene…. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-SDA-2026-04-26-gap-20260426-001521-04-elevated-circulating-spdgfr-reflects-early-peric-049b5bfce6

BibTeX 
@misc{scidex_hypothesis_hsda2026,
  title        = {Elevated Circulating sPDGFRβ Reflects Early Pericyte Loss Preceding Neurodegene…},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-SDA-2026-04-26-gap-20260426-001521-04-elevated-circulating-spdgfr-reflects-early-peric-049b5bfce6},
  note         = {SciDEX artifact hypothesis:h-SDA-2026-04-26-gap-20260426-001521-04-elevated-circulating-spdgfr-reflects-early-peric-049b5bfce6}
}

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