Self-healing engineered muscle grown in lab

In a first, scientists have grown living skeletal muscle that is more than 10 times stronger than any previous engineered muscles and has the ability to heal itself both inside the laboratory and inside an animal.
The lab-grown muscle by researchers from Duke University is the first to heal itself after animal implantation.
"The muscle we have made represents an important advance for the field. It's the first time engineered muscle has been created that contracts as strongly as native neonatal skeletal muscle," said Nenad Bursac, associate professor of biomedical engineering at Duke.
A team led by Bursac and graduate student Mark Juhas discovered that preparing better muscle requires two things - well-developed contractile muscle fibres and a pool of muscle stem cells, known as satellite cells.

Every muscle has satellite cells on reserve, ready to activate upon injury and begin the regeneration process.
The key to the team's success was successfully creating the microenvironments - called niches - where these stem cells await their call to duty.

"Simply implanting satellite cells or less-developed muscle doesn't work as well. The well-developed muscle we made provides niches for satellite cells to live in, and, when needed, to restore the robust musculature and its function," said Juhas.
To put their muscle to the test, the engineers ran it through a gauntlet of trials in the laboratory. By stimulating it with electric pulses, they measured its contractile strength, showing that it was more than 10 times stronger than any previous engineered muscles.

They damaged it with a toxin found in snake venom to prove that the satellite cells could activate, multiply and successfully heal the injured muscle fibres. Then they moved it out of a dish and into a mouse.
With the help of Greg Palmer, an assistant professor of radiation oncology in the Duke University School of Medicine, the team inserted their lab-grown muscle into a small chamber placed on the backs of live mice.
The chamber was then covered by a glass panel. Every two days for two weeks, Juhas imaged the implanted muscles through the window to check on their progress.

By genetically modifying the muscle fibres to produce fluorescent flashes during calcium spikes - which cause muscle to contract - the researchers could watch the flashes become brighter as the muscle grew stronger.
"We could see and measure in real time how blood vessels grew into the implanted muscle fibers, maturing toward equaling the strength of its native counterpart," said Juhas.
The engineers are now beginning work to see if their biomimetic muscle can be used to repair actual muscle injuries and disease.
The findings appear in the Proceedings of the National Academy of Sciences.