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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Updated: Jun 25, 2025

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Sequential Fabrication of a Three-Layer Retina-like Structure.

Yahel Shechter1, Roni Cohen1,2,3, Michael Namestnikov1

  • 1Shmunis School of Biomedicine and Cancer Research, Faculty of Life Science, Tel Aviv University, Tel Aviv 6997801, Israel.

Gels (Basel, Switzerland)
|May 24, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a three-layer retina-like tissue using 3D printing and cell deposition. This innovative tissue engineering approach aims to treat degenerative maculopathies like age-related macular degeneration (AMD).

Keywords:
3D bio-printingage-related macular degenerationretinatissue engineering

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Ophthalmology

Background:

  • Age-related macular degeneration (AMD) is a leading cause of blindness, characterized by the degeneration of retinal layers including the choroid, retinal pigmented epithelium (RPE), and photoreceptors.
  • Current treatments for advanced AMD are limited, highlighting the need for novel therapeutic strategies.
  • Tissue engineering offers a promising avenue for restoring retinal function.

Purpose of the Study:

  • To develop a reproducible, step-by-step fabrication process for a three-layer, retina-like tissue structure.
  • To create a functional implant capable of addressing the complex degeneration seen in maculopathies.
  • To evaluate the potential of this engineered tissue for treating degenerative retinal diseases.

Main Methods:

  • Fabrication involved 3D printing of a choroid-like structure within an extracellular matrix (ECM) hydrogel.
  • Subsequent deposition of a retinal pigmented epithelium (RPE) monolayer, followed by photoreceptor cell integration.
  • Characterization of individual layer morphology, specific marker expression, and overall three-layer retinal integration.

Main Results:

  • A functional three-layer retina-like structure was successfully fabricated.
  • The process ensured proper organization and interaction between the choroid, RPE, and photoreceptor layers.
  • Morphological and marker analyses confirmed the successful integration and potential viability of the engineered retinal construct.

Conclusions:

  • The developed fabrication process provides a viable method for creating complex, multi-layered retinal tissue.
  • This engineered retina-like structure holds potential for attenuating retinal degeneration and improving engraftment and regeneration.
  • The retinal implant may offer a future therapeutic option for macular degenerative diseases, potentially preventing blindness.