UCSF Breakthrough: New Material Enables Predictable Organoid Growth
Scientists at UC San Francisco have developed a new material that enables miniature organs, known as organoids, to grow in a more predictable manner. Previously, organoids grew inconsistently, complicating research.
The new material combines microparticles of alginate, a carbohydrate from algae, with Matrigel, the standard gel for organoid growth. This mixture creates a soft, supportive environment similar to natural tissue development.
This innovation allows scientists to 3D print stem cells into precise shapes in petri dishes before maturation, leading to more consistent and improved organoid development.
These enhanced growing conditions could support the future manufacture of replacement human tissues, such as for damaged heart tissue.
The Science Behind the Stability
Zev Gartner, PhD, professor of Pharmaceutical Chemistry at UCSF and senior author of the paper published in Nature Materials, highlighted a crucial aspect of the new material:
The material's stress relaxation — how it relaxes over time — was crucial, needing to adapt at the same rate as tissue reshaping.
The team's method differs from traditional 3D printing, which often struggles with Matrigel due to its consistency. The alginate microparticles create a "wet sand-like" material that supports printed stem cells, providing consistent initial shapes and sizes. As cells grow, the material loosens, allowing organoids to expand and fold naturally.
Austin Graham, PhD, first author of the paper, emphasized the core objective:
The goal was a material allowing precise cell placement while facilitating natural growth and organization.
Proven Results and Future Potential
The method was successfully tested with several organoid-forming tissues, including mouse intestinal and salivary gland cells, human vascular cells, and human stem-cell-derived brain cells. Printed clusters developed into healthy organoids, often sprouting developmental buds. Intestinal cells printed in lines formed fluid-carrying tubes.
This approach leverages cells' natural abilities, aiming for a stage where an organ begins to assemble itself rather than being constructed piece by piece.