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Novel Scaffolding Techniques Advance Organoid Growth for Tissue Engineering

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Two Breakthroughs in Organoid Research Promise Larger, More Functional Lab-Grown Tissues

Scientists at two separate research institutions have developed new methods for growing organoids—miniature, simplified versions of human organs—that produce larger, more consistent, and functionally mature tissues. The two approaches, published separately, address longstanding challenges in tissue engineering by improving the structural support and growth environment for these lab-grown cell clusters.

UC San Francisco: Material Innovation for Predictable Organoid Development

Researchers at the University of California, San Francisco (UCSF) have created a new composite material that allows organoids to grow in a more predictable manner.

Material Composition and Mechanism

  • The material combines microparticles of alginate (a carbohydrate derived from algae) with Matrigel, the standard gel used for organoid growth.
  • The resulting mixture creates a soft, supportive environment that mimics natural tissue development.
  • The material's "stress relaxation" properties—its ability to adapt over time—were identified as crucial for allowing organoids to expand and fold naturally as they grow.

"The material's stress relaxation properties allow organoids to expand and fold naturally as they grow."

Methodology

  • Scientists used a 3D printing technique to place stem cells into precise shapes within the material.
  • The alginate microparticles create a "wet sand-like" consistency that supports printed stem cells, overcoming difficulties associated with printing into Matrigel alone.
  • As the cells grow, the material loosens, enabling the developing organoids to expand and organize themselves.

Testing and Results

  • The method was successfully tested with multiple tissue types, including mouse intestinal cells, mouse salivary gland cells, human vascular cells, and human stem-cell-derived brain cells.
  • Printed clusters developed into healthy organoids, with some sprouting developmental buds.
  • Intestinal cells printed in lines formed fluid-carrying tubes.

The study was led by Zev Gartner, PhD, professor of Pharmaceutical Chemistry at UCSF, and Austin Graham, PhD, first author. The findings were published in Nature Materials.

Cincinnati Children's Hospital & Nantes Université: Confined Culture System for Larger Gut Organoids

Researchers at Cincinnati Children's Hospital Medical Center and Nantes Université have developed a "confined culture system" (CCS) using 3D-printed silicone trays to grow larger, more functional human gut organoids.

Production Process

  • Spherical organoids derived from induced pluripotent stem cells (iPSCs) are placed into grooves of 3D-printed silicone trays.
  • Over six days, the spheroids fuse into unified constructs in a specific nutrient medium.
  • Constructs are then transferred to a hydrogel medium for an additional eight days.
  • By day 14, the organoids reach maturity, containing all cell types and structures characteristic of mature gut tissue.

Key Outcomes

  • The system produces centimeter-scale tubular organoids (small intestine, colon, and stomach) approximately 10 times larger than previous methods.
  • Organoids reached transplantation maturity in 14 days, compared to 28 days with prior protocols.
  • The organoids developed a functional enteric nervous system without external introduction of nerve cells.
  • After transplantation into immunocompromised rodents, up to 8 cm of functional small intestine tissue was obtained, compared to approximately 1 cm with previous methods.
  • Neuromuscular function of the transplanted tissue was reported to be similar to native human tissue.

"The organoids developed a functional enteric nervous system without external introduction of nerve cells."

Background

  • The study was published on May 22, 2026, in Nature Biomedical Engineering.
  • The team was led by Holly Poling, PhD, and Maxime Mahe, PhD, and included 17 other scientists.
  • The research was supported by the National Institute of Diabetes and Digestive and Kidney Diseases (U01 DK103117, P30 DK078392) and the Agence Nationale de la Recherche (ANR-17-CE14-0021, ANR-21-CE14-0017).
  • Cincinnati Children's Center for Stem Cell & Organoid Medicine (CuSTOM) has developed digestive system organoids for over 15 years. Previous work in 2017 combined neural crest cells with intestinal tissue to create organoids with nerve function.

Significance and Future Applications

Both research groups noted that their methods represent steps toward scalable, reproducible production of complex human tissues. Potential applications include:

  • Manufacturing replacement human tissues, such as for damaged heart tissue (UCSF).
  • Enabling studies of neurodevelopmental disorders through self-organized nervous systems (Cincinnati).
  • Repairing or restoring function in patients with gastrointestinal damage (Cincinnati).

"Both research groups noted that their methods represent steps toward scalable, reproducible production of complex human tissues."

Researchers emphasized that clinical trials are not yet imminent and that additional development and research are needed before human applications.