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New 3D Printing Technique Could Help Build More Strong & Realistic Human Tissue

A breakthrough approach could make 3D-printed tissues stronger, more organized and better suited for future medical applications

Scientists at the University of Bayreuth have developed a new approach that could improve the way biological tissues are created using 3D printing. In a recent study, researchers combined 3D bioprinting with touch-spinning, a fiber-production technique, in a single device.

The goal is simple but ambitious: create tissue structures that are not only capable of supporting living cells but also provide them with the right physical environment to grow and organize.

The research was led by Prof. Dr. Leonid Ionov, Professor of Biofabrication, and his team at the University of Bayreuth. Their work focuses on combining different materials and technologies to produce more sophisticated tissue structures for biofabrication and tissue engineering.

Why Hydrogels Matter in Tissue Printing

Hydrogels are one of the most widely used materials in tissue engineering. In simple terms, a hydrogel is a polymer material that can absorb and retain large amounts of water without dissolving.

This makes hydrogels particularly useful for working with living cells. Because the human body is largely made up of water, a hydrogel can provide cells with a soft, watery environment that resembles some of the conditions they experience naturally.

In 3D bioprinting, hydrogels containing living cells are commonly called bioinks. These bioinks can be printed layer by layer to create three-dimensional structures.

However, hydrogels also have a major challenge: by themselves, they may not always provide enough mechanical strength or the structural guidance needed to create complex tissues.

This is where fibers enter the picture.

Adding Fibers to Give Cells Direction

Many tissues in the human body contain highly organized fibrous structures. Muscle tissue, connective tissue and several other biological structures depend on the precise arrangement of cells and fibers.

The Bayreuth researchers therefore explored a composite approach in which cell-containing hydrogels are combined with fibers.

The basic idea is that each component performs a different job.

The hydrogel provides a water-rich environment in which cells can survive and function. Meanwhile, the fibers provide mechanical support and can help guide cells in a particular direction.

Prof. Dr. Ionov explains the concept by noting that the hydrogel creates an aqueous environment that supports cell function, while the fibers can control the orientation of cells along the main direction of the fibers.

This combination could therefore bring the printed structure closer to the organized architecture found in natural tissues.

A New Combination of Two Technologies

The most important feature of the study is the integration of two manufacturing processes: 3D (bio)printing and touch-spinning.

Touch spinning is a scalable technique used to produce fibers from a polymer solution or polymer melt. The resulting fibers can be extremely useful when researchers want to introduce an organized fibrous structure into a material.

Until now, these technologies were generally used separately. The Bayreuth scientists have now combined them into one integrated device.

This means that researchers can potentially print the hydrogel structure while simultaneously introducing fibers into the material.

Such integration could make it easier to manufacture multilayer structures with controlled internal organization.

Testing Different Hydrogels

As part of the research, the scientists tested and compared different types of hydrogels.

Hydrogels have already been used for decades as scaffold materials in tissue engineering and biofabrication. Tissue engineering is a broad field that aims to develop biological tissues artificially or help damaged tissues regenerate.

Choosing the right hydrogel is important because different hydrogels have different physical and biological properties. They can vary in factors such as strength, flexibility, water content and their ability to support cells.

By comparing different hydrogel systems, the researchers were able to investigate which materials were most suitable for creating their new fiber-reinforced structures.

The study therefore goes beyond simply demonstrating a new machine. It also examines how different materials behave when they are incorporated into this new fabrication strategy.

Less Need for Strong Chemical Cross-Linking

Another important advantage of the fiber-hydrogel combination is that it could reduce the need for extensive cross-linking of hydrogels.

Cross-linking is a process used to connect polymer chains within a hydrogel. It can improve the mechanical strength and stability of the material.

However, very strong cross-linking can also create disadvantages for biological applications. A highly cross-linked material may not always provide the most favorable environment for subsequent tissue development.

With the new composite approach, much of the mechanical strength can come from the fiber network rather than from heavily cross-linking the hydrogel.

This could allow researchers to use hydrogels with a lower degree of cross-linking.

According to the researchers, this is particularly valuable because a less heavily cross-linked hydrogel may be more favorable for the later development of tissue.

Why Cell Alignment Is Important

One of the most interesting possibilities offered by the technology is better control over cell alignment.

Cells in many tissues are not randomly positioned. Their orientation and organization are essential to how tissues function.

Muscle cells, for example, are arranged in an organized direction that allows muscle tissue to contract efficiently. Similarly, connective tissues contain highly organized fibers that contribute to their strength and function.

If scientists can create printed structures in which cells naturally align along specific fiber directions, they may be able to produce tissue models that more closely resemble biological tissues.

The integrated printing and touch-spinning system could therefore provide researchers with greater control over the architecture of artificial tissues.

A Multilayer Approach to Biofabrication

In their study, published in the journal Advanced Healthcare Materials, Prof. Ionov and his colleagues describe a novel approach for producing multilayer bioink-fiber composites.

The research involved Prof. Dr. Dr. Elisabetta Ada Cavalcanti-Adam, Chair of Cellular Biomechanics; Waseem Kitana, a Ph.D. student at the Chair of Biofabrication; and Dr. Victoria Levario-Diaz from the Max Planck Institute for Medical Research.

The multilayer approach is important because real tissues are complex three-dimensional systems rather than simple flat structures.

Being able to combine different layers of hydrogel and fibers could eventually allow researchers to build increasingly sophisticated tissue architectures.

What Could Come Next?

The researchers believe their findings are particularly important for producing tissues with fibrous structures and uniaxial cell alignment, including connective and muscle tissues.

The technology is still part of ongoing research, and it should not be viewed as a ready-made method for printing replacement human organs. However, it provides an important new tool for scientists working in biofabrication and tissue engineering.

In the longer term, technologies like this could contribute to improved laboratory-grown tissue models, regenerative medicine research and the development of more realistic tissue structures for medical studies.

The biggest achievement may be the principle behind the technology: instead of asking one material to perform every function, researchers are combining materials so that each one does what it does best.

Hydrogels support living cells. Fibers provide strength and direction. 3D printing creates the overall structure. Touch spinning introduces organized fibers.

By bringing all of these elements together in one system, the University of Bayreuth team has opened a promising new pathway for creating more structured and functional biological tissues.

For the future of 3D bioprinting, that could be a significant step forward.

Reference: W. Kitana, V. Levario-Diaz, E. A. Cavalcanti-Adam, L. Ionov, Biofabrication of Composite Bioink-Nanofiber Constructs: Effect of Rheological Properties of Bioinks on 3D (Bio)Printing and Cells Interaction with Aligned Touch Spun Nanofibers. Adv. Healthcare Mater. 2024, 13, 2303343. https://doi.org/10.1002/adhm.202303343

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