A potential new gene therapy for Duchenne muscular dystrophy (DMD), which mainly affects men, may soon be available, following a significant breakthrough achieved by University of Missouri scientists in the United States.
The researchers say that they have identified the location of genetic material responsible for the production of nNOS, a molecular compound that produces nitric oxide and is vital to curing the disease.
They describe nNOS as a "helper" molecular compound that enables a protein called dystrophin to prevent the muscle tissue from being replaced with fibrous, bony or fatty tissue, and losing function.
"When you exercise, not only does the muscle contract, but the blood vessels are constricted. nNOS is important because it produces nitric oxide that relaxes the blood vessels, helping to maintain the muscle with a healthy blood supply. If no blood reaches the muscle cells, they will eventually die. In DMD patients, this means the disease will progress as the muscle cells are replaced by the fibrous, bony or fatty tissue," said Dongsheng Duan, associate professor of molecular microbiology and immunology.
He claims that his team's study is the first to determine how to produce nNOS in a dystrophic muscle, or a muscle lacking dystrophin.
Writing about his study in The Journal of Clinical Investigation, the researcher reveals that he and his colleagues have identified the location of genetic material responsible for the production of nNOS.
After the identification of the genetic material, his team created a series of new dystrophin genes.
While experimenting on mice, the researchers genetically corrected the dystrophic animals with the new dystrophin gene, and found that the missing nNOS was restored in their muscle.
Duan revealed that the mice that received the new gene did not experience muscle damage or fatigue following exercise.
"With this new discovery, we've solved a longstanding mystery of Duchenne Muscular Dystrophy. This will change the way we approach gene therapy for DMD patients in the future. With this study, we have finally found the genetic material that can fully restore all the functions required for correcting a dystrophic muscle and turning it into a normal muscle," he said.