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Supportive Gel Allows for Bioprinting of Complex Shapes

October 16th, 2020 Conn Hastings Materials, Plastic Surgery, Surgery

Researchers at Penn State have developed a supportive gel that allows for printing of complex shapes using cell aggregates. The gel provides a supportive matrix during the printing process, and permits the researchers to place the aggregates wherever they want. This technique could pave the way for printed replacements for tissues and organs.

Bioprinting, where cell aggregates, such as organoids, are printed to form complex shapes, holds significant promise for regenerative medicine. Simply printing replacement tissues or organs is a tantalizing idea. However, the process is delicate, and so far, it has been challenging to create complex shapes, limiting the potential of the technique.

“The reason why this is important is that the current cell aggregate bioprinting techniques can’t make complicated configurations and is mostly in 2D and 3D thin films or simple configurations,” said Ibrahim T. Ozbolat, a researcher involved in the new study published in journal Communications Physics. “If we want complicated 3D, we need a supportive field.”

These researchers developed a yield stress gel to provide a supportive matrix. Under normal conditions, the gel is semi-solid, but when subjected to a force, it changes to become liquid. These properties allow a bioprinting system to deposit a cell aggregate within the gel and then withdraw, leaving the aggregate in place.

The printing system consists of an aspiration nozzle that can grab and release cell aggregates. The nozzle can create enough force to easily deposit them within the gel, before withdrawing and allowing the gel to rapidly self-heal. Later, the gel can be removed. “We tried two different types of gels, but the first one was a little tricky to remove,” said Ozbolat. “We had to do it through washing. For the second gel, we used an enzyme that liquefied the gel and removed it easily.”

The technique is still under development, but in the future it may allow the researchers to create complex shapes that are useful for implantation in the body.     

See a video about the technique below.

Study in Communications Physics: Aspiration-assisted freeform bioprinting of pre-fabricated tissue spheroids in a yield-stress gel

Via: Penn State

Conn Hastings

Conn Hastings received a PhD from the Royal College of Surgeons in Ireland for his work in drug delivery, investigating the potential of injectable hydrogels to deliver cells, drugs and nanoparticles in the treatment of cancer and cardiovascular diseases. After achieving his PhD and completing a year of postdoctoral research, Conn pursued a career in academic publishing, before becoming a full-time science writer and editor, combining his experience within the biomedical sciences with his passion for written communication.

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