Major Medical Advance: Working Vocal Cords Grown in a Lab Out of Human Cells
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Ian Sample | The Guardian
Vocal cords that produce realistic sounds have been grown in the lab from human cells.
The work marks a first step towards better treatments for patients who lose their voices to injury or disease.
Vocal cords are formed by two bands of smooth muscle tissue that are lined with a material called mucosa. When air passes through them, the folds vibrate hundreds of times per second to make sounds.
But diseases such as cancer can destroy the delicate folds and for many patients, the medical treatments are limited. Some patients with damaged vocal cords have viscous materials injected to make the folds more pliable. Others improve with voice coaching.
Researchers in the US took a different approach and grew layers of vocal cord cells onto scaffolds that produced tough elastic tissue similar to those within the natural voice box. When doctors tested the lab-grown tissue in voice boxes taken from dead dogs, they found they produced the same sounds as the natural tissue.
“Voice is a pretty amazing thing, yet we don’t give it much thought until something goes wrong,” said lead researcher Nathan Welham at the University of Wisconsin-Madison. “The ability to vibrate and make sounds is pretty remarkable and unique to this part of the body.”
“When the tissue is damaged it doesn’t recover and regenerate normally and we don’t have great solutions at present to deal with that,” Welham added. “It’s an exquisite system and a hard thing to replicate.”
Working with doctors in Japan, the US team grew tissue from healthy connective tissue and lining cells taken from the vocal cords of four patients whose voice boxes had been removed for medical reasons, and one dead human donor.
After two weeks in the lab, the two cell types began to assemble into layers that resembled the structure of healthy vocal cords. Details of the research are reported in the journal Science Translational Medicine.
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Source: http://truthisscary.com/2015/11/major-medical-advance-working-vocal-cords-grown-in-a-lab-out-of-human-cells/
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