A groundbreaking gel may be the key to helping individuals regain their voices.
Researchers at McGill University have made significant strides in developing a new type of hydrogel that holds promise for aiding recovery from vocal cord injuries. Initial findings indicate that this innovative material could provide a superior alternative for restoring damaged voices compared to existing treatment options.
When scar tissue forms on the vocal cords, it often leads to permanent voice loss. Current injectable materials that are used for treatment tend to deteriorate quickly within the body, which can necessitate multiple injections. Each additional injection carries the potential risk of causing further harm to the already delicate tissue.
Early Testing Shows Promising Longevity
In a preclinical study featured in the journal Biomaterials, the research team discovered that their novel gel maintained its structure for several weeks during both lab and animal tests. This increased durability gives the vocal cords more time to heal, unlike conventional injectable treatments that typically break down much sooner.
The hydrogel is formulated from natural tissue proteins that are first processed into a powdered form and then transformed into a gel. To enhance the material's strength and slow down its degradation, the researchers utilized a technique known as click chemistry.
"This unique process distinguishes our approach," explained co-senior author Maryam Tabrizian, who is a professor in McGill's Department of Biomedical Engineering and holds a Canada Research Chair (Tier 1) in Nanomedicine and Regenerative Medicine. "It functions like a molecular adhesive, binding the material so that it remains stable post-injection."
Who Suffers Most from Voice Loss?
Vocal cord injuries disproportionately affect older adults, particularly those with conditions such as acid reflux or those who smoke. Additionally, individuals whose professions heavily rely on their voices—like singers, teachers, and radio personalities—are at an elevated risk.
According to the U.S. National Institutes of Health, approximately one in every thirteen adults encounters a voice disorder each year. Nicole Li-Jessen, the senior author and a clinician-scientist who also plays piano and collaborates with singers, has witnessed the profound effects that voice loss can have on individuals.
"Many people take their voices for granted, but losing the ability to speak or sing can severely impact mental well-being and overall quality of life, especially for those whose careers depend on it," stated Li-Jessen, who is an associate professor in McGill's School of Communication Sciences and Disorders and holds a Canada Research Chair (Tier 2) focused on Personalized Medicine for Upper Airway Health and Diseases.
What Lies Ahead?
The research team is poised to conduct further investigations into the gel using computer simulations designed to mimic its behavior within the human body. Should these simulations corroborate the preliminary results, the subsequent phase would involve conducting human clinical trials. If successful, this could pave the way for a minimally invasive treatment option that lasts longer and minimizes the need for repeated procedures.
Study Reference
The research article titled "Clicktetrazine dECM-alginate hydrogels for injectable, mechanically mimetic, and biologically active vocal fold biomaterials" was authored by Mika Brown, Hideaki Okuyama, Ling Li, Zhen Yang, Jianyu Li, Maryam Tabrizian, and Nicole Li-Jessen, and published in Biomaterials. The study received support from the Natural Sciences and Engineering Research Council of Canada, along with research grants for Canada Research Chairs.
