Editor’s Note (September 2026): This article was originally published in December 2021 and reflects the research available at that time. It has since been reviewed for accuracy and clarity. Language suggesting that the experimental hydrogel had already been shown to repair damaged human hearts or vocal cords has been corrected to reflect the preclinical nature of the research.
Key Takeaways
McGill University researchers developed an injectable hydrogel designed to combine mechanical strength with a porous structure that allows cells and fluids to move through it.
In laboratory testing, the hydrogel remained intact after more than 6 million cycles of high-frequency mechanical stimulation at 120 Hz.
The material showed potential for regenerative medicine applications involving mechanically active tissues, but the study did not demonstrate that it could repair damaged human hearts or vocal cords.
Heart Failure
Researchers at McGill University developed an injectable biomaterial designed to withstand the demanding mechanical conditions experienced by tissues that are constantly moving.
The hydrogel combines toughness with interconnected pores that allow fluids to pass through the material and can support the encapsulation, proliferation, and spreading of cells.
The research was first published online in November 2021 in Advanced Science.
Why Develop a New Hydrogel?
Regenerative medicine researchers have long investigated biomaterials that could help support the repair or replacement of damaged tissues.
Injectable hydrogels are particularly interesting because they can potentially be delivered through a needle and form supportive structures within tissues.
However, developing an injectable hydrogel that is both highly porous and mechanically durable presents a challenge.
Porosity is important because cells require access to nutrients and oxygen, while mechanical strength is particularly important when a material is intended for tissues exposed to repeated movement.
The McGill researchers attempted to combine these properties in a single material.
A Porous and Durable Hydrogel
The researchers developed what they described as an injectable, pore-forming double-network hydrogel.
Its interconnected pores allowed fluid to move through relatively large hydrogel structures. The material was also compatible with cell encapsulation and supported cell proliferation and spreading under experimental conditions.
Researchers then subjected the hydrogel to demanding biomechanical simulations to determine whether it could withstand repeated mechanical stress.
More Than 6 Million Cycles of Mechanical Stress
To simulate conditions experienced by mechanically active tissues, researchers tested the hydrogel in biomimetic perfusion bioreactors.
The material maintained its physical integrity after more than 6 million cycles of high-frequency mechanical stimulation at 120 Hz.
This combination of porosity and fatigue resistance was particularly important because biomaterials intended for dynamic tissues must withstand repeated movement without rapidly breaking apart.
The researchers identified vocal folds as one potential application because they undergo rapid and repeated vibration.
Could It Eventually Help Repair Damaged Tissue?
The results suggested that the hydrogel could have potential applications in regenerative medicine and tissue engineering.
However, it is important to distinguish potential applications from demonstrated medical treatments.
The study primarily evaluated the material’s physical properties, permeability, compatibility with cells, and resistance to mechanical stress. It did not demonstrate that injecting the hydrogel into people could repair damaged hearts or vocal cords.
Additional preclinical and eventually clinical research would be required to establish whether the material is safe and effective for treating patients.
Potential Applications Beyond Tissue Repair
The researchers also identified several other possible applications for the hydrogel technology.
Because the material is injectable, porous, perfusable, mechanically durable, and compatible with cells, it could potentially be useful for tissue engineering, drug or cell delivery, biofabrication, disease modeling, and organs-on-chips.
The McGill team was also exploring whether the technology could contribute to developing synthetic tissue models for testing drugs, including models relevant to respiratory research.
These applications remained areas for future research rather than established clinical uses.
Final Thoughts
The McGill University research represented an interesting advance in biomaterials engineering.
The researchers developed an injectable hydrogel that combined interconnected pores with unusual resistance to repeated mechanical stress. In laboratory testing, it remained intact through more than 6 million cycles of high-frequency stimulation.
Those characteristics could make the material useful for future research involving mechanically active tissues such as vocal folds and potentially other applications in regenerative medicine.
However, the 2021 study did not establish that the hydrogel could repair damaged hearts or vocal cords in patients. Its clinical potential still required further preclinical and human research.
References
Taheri, S., Bao, G., He, Z., Mohammadi, S., Ravanbakhsh, H., Lessard, L., Li, J., & Mongeau, L. (2022). Injectable, pore-forming, perfusable double-network hydrogels resilient to extreme biomechanical stimulations. Advanced Science, 9(2), 2102627. https://doi.org/10.1002/advs.202102627
Mao, A. S., & Mooney, D. J. (2015). Regenerative medicine: Current therapies and future directions. Proceedings of the National Academy of Sciences, 112(47), 14452–14459. https://doi.org/10.1073/pnas.1508520112