Sources

"Generation of a ciliary margin-like stem cell niche from self-organizing human retinal tissue"

Generated 2026-04-12 07:16 UTC

Metadata

title
"Generation of a ciliary margin-like stem cell niche from self-organizing human retinal tissue"
kind
paper
status
ingested
added
2026-04-09T16:00:00+09:00
raw source
raw/sources/kuwahara_2015_generation_of_a_ciliary.pdf
article url
https://www.nature.com/articles/ncomms7286
published date
2015-02-19
organ
retina
protocol focus
self-organizing neural retina with ciliary margin-like niche from hESCs
deep ingested
2026-04-09

Generation of a ciliary margin-like stem cell niche from self-organizing human retinal tissue

Source

Study design

  • Starting material: hESCs (Rx::Venus reporter line and others)
  • Base protocol: SFEBq (serum-free floating culture of embryoid body-like aggregates) in growth factor-free chemically defined medium (gfCDM) without Matrigel
  • Key innovation: timed BMP4 treatment (1.5 nM starting at day 6, half-dilution every 3rd day)
  • Step-wise induction-reversal: GSK3 + FGFR inhibition → NR-to-RPE transition; removal → RPE-to-NR reversion
  • Readouts: Rx::Venus reporter, neural retina (NR) markers (Rx, Chx10, Pax6, Sox2), RPE markers (Mitf), ciliary margin (CM) markers

Key findings

  • Timed BMP4 treatment achieves >95% Rx+ neural retinal aggregates — a major improvement over Matrigel-based previous methods (~10% efficiency).
  • The new culture is Matrigel-free, removing a major source of batch-to-batch variability and enabling future clinical translation.
  • Step-wise induction-reversal method generates aggregates with RPE at the margin of central-peripherally polarized NR.
  • NR-RPE boundary tissue self-organizes a ciliary margin-like stem cell niche — a feature absent from earlier optic cup protocols.
  • The CM niche expands the NR peripherally by de novo progenitor generation, mirroring in vivo CM stem cell behavior.

Distinctive contribution in this corpus

  • First entry for retinal organoids in this collection — fills a major organ gap.
  • Advances Sasai lab's pioneering optic cup work (Eiraku 2011, Nakano 2012) with higher efficiency, matrix-free culture, and a new tissue element (CM niche).
  • Demonstrates that self-organization can reproduce developmental niches (CM) not just tissue types (NR).

Limitations and caveats

  • hESCs only in the main figures; broader hiPSC validation not central.
  • Photoreceptor maturation is limited in this paper — later retinal protocols (Cowan 2020 etc.) extend this.
  • Still depends on KSR (knockout serum replacement).

Relevance to corpus

  • Provides a template for retina questions: "do we need NR, RPE, or ciliary margin stem cells?"
  • Contrasts with directed kidney/liver/lung protocols in this corpus — retinal organoids remain in the self-organization paradigm.
  • Key reference for any downstream retinal disease modeling work.

Open questions

  • Is the CM niche functionally competent in the long term (months to years)?
  • Can this method be integrated with current photoreceptor maturation protocols?
  • Does Matrigel-free culture reduce batch variability quantitatively?
  • (Corpus gap: need downstream retinal protocols — Cowan 2020, Capowski 2019, Sharma 2019 still blocked for download.)

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