Self-Healing Muscle Engineered in Laboratoryselfnews Post The study conducted at Duke University tested the bioengineered muscle by literally watching it through a window on the back of living mouse. The novel technique allowed for real-time monitoring of the muscles integration and maturation inside a living, walking animal. Both the lab-grown muscle and experimental techniques are important steps toward growing viable muscle for studying diseases and treating injuries, said Nenad Bursac, associate professor of biomedical engineering at Duke. The results appear the week of March 25 in the Proceedings of the National Academy of Sciences Early Edition. The muscle we have made represents an important advance for the field, Bursac said. Its the first time engineered muscle has been created that contracts as strongly as native neonatal skeletal muscle. Through years of perfecting their techniques, a team led by Bursac and graduate student Mark Juhas discovered that preparing better muscle requires two things well-developed contractile muscle fibers 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 teams success was successfully creating the microenvironments called niches where these stem cells await their call to duty. 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 fibers. 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 fibers 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. Can it vascularize, innervate and repair the damaged muscles function? asked Bursac. That is what we will be working on for the next several years. This work was supported by a National Science Foundation Graduate Research Fellowship and the National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR055226). Biomimetic engineered muscle with capacity for vascular integration and functional maturation in vivo. Juhas, M., Engelmayr, Jr., G.C., Fontanella, A.N., Palmer, G.M., Bursac, N. PNAS Early Edition, March, 2014. DOI: 10.1073/pnas.1402723111 