Sources

"Engineering of human brain organoids with a functional vascular-like system"

Generated 2026-04-12 07:16 UTC

Metadata

title
"Engineering of human brain organoids with a functional vascular-like system"
kind
paper
status
ingested
added
2026-04-09T17:00:00+09:00
raw source
raw/sources/cakir_2019_engineering_of_human_brain.pdf
article url
https://www.nature.com/articles/s41592-019-0586-5
published date
2019-10-07
organ
brain + vascular
protocol focus
ETV2-induced vascular-like network in human cortical organoids
deep ingested
2026-04-09

Engineering of human brain organoids with a functional vascular-like system

Source

Study design

  • Starting material: hESCs engineered to ectopically express human ETS variant 2 (ETV2) — a transcription factor that reprograms cells toward endothelial fate
  • Approach: mix 20% ETV2+ cells with 80% regular hPSCs to form cortical organoids
  • ETV2 induction: day 18
  • Timepoints analyzed: day 30, 70, 120
  • Readouts: CD31/CDH5 immunostaining, whole-mount imaging, qPCR for EC markers, TUNEL (apoptosis), HIF-1α (hypoxia), FITC-dextran perfusion test, electron microscopy, blood-brain barrier marker expression, trans-endothelial electrical resistance

Key findings

  • ETV2 overexpression induces EC differentiation in hESCs regardless of differentiation condition — works in EB, neural, and EC differentiation protocols.
  • Optimal: 20% ETV2+ cells + induction at day 18 → best vascular-like network formation.
  • Vascularized cortical organoids (vhCOs) form CD31+ endothelial tubes by day 30; more complex networks by day 70.
  • vhCOs have significantly more vessel area and vessel length than control hCOs.
  • Perfusable vasculature: FITC-dextran perfusion shows functional lumen connectivity (~8% of VZ lumens are perfusable).
  • Dramatic reduction in apoptosis and hypoxia: control hCOs show ~35% TUNEL+ at day 70 and ~42% HIF-1α+ regions at day 120; vhCOs show minimal cell death and only ~2.5% hypoxic regions.
  • Blood-brain barrier characteristics acquired: tight junctions, nutrient transporters, increased trans-endothelial electrical resistance.
  • After transplantation in vivo: ETV2-induced endothelium supports formation of perfused blood vessels.
  • Both control and vhCOs have similar VZ/SVZ/cortical layer organization — vascularization does not perturb neural identity.

Distinctive contribution in this corpus

  • First example of ectopic TF-driven vascularization in a brain organoid in this corpus.
  • Demonstrates that engineered co-development (not just co-culture) can produce integrated vascular networks.
  • Provides one answer to the hypoxia/necrotic core problem that plagues large cerebral organoids.
  • Complements Homan 2019 (flow-enhanced) and Wörsdorfer 2019 (MPC incorporation) vascularization strategies.

Limitations and caveats

  • Requires genetic engineering (ETV2 transduction) — not trivial for all labs.
  • Vascular-like structures are not true capillaries; missing mural cell complexity.
  • Only cortical organoids tested; generalization to other brain regions unclear.
  • "Functional" BBB features are suggestive, not comprehensive.

Relevance to corpus

  • Complements the vascularization paper cluster: Wimmer 2019 (stand-alone vessels), Homan 2019 (flow for kidney), Wörsdorfer 2019 (MPC incorporation).
  • Mechanistically closest to Wörsdorfer 2019: both use mesodermal/endothelial progenitor incorporation, but Cakir uses a TF approach while Wörsdorfer uses direct cell mixing.
  • Wimmer 2019 — stand-alone vessel organoid protocol.
  • Homan 2019 — alternative vascular maturation via flow.
  • Wörsdorfer 2019 — alternative via MPC mixing.
  • Lancaster 2014 — baseline brain organoid that suffers from the hypoxic core this paper addresses.

Open questions

  • How does BBB fidelity compare to in vivo human BBB?
  • Can this approach be extended to other brain regions (hippocampus, midbrain)?
  • Does ETV2-induced endothelium alter neural subtype specification, even subtly?

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