Neurons, or nerve cells, are critical for human health and functioning. Human brains have about 100 billion neurons, which serve as messengers that transmit signals from the body to the brain and vice versa.Moghe said a 3D scaffold, developed by the scientists, consists of tiny polymer fibers. Hundreds of neurons attach to the fibers and branch out, sending their signals. Scaffolds are about 100 micrometers wide — roughly the width of a human hair.
“We take a whole bunch of these islands and then we inject them into the brain of the mouse,” he said. “These neurons that are transplanted into the brain actually survived quite miraculously well. In fact, they survived so much better than the gold standard in the field.”
Indeed, the scaffold technology results in a 100-fold increase in cell survival over other methods, Moghe said.And that may eventually help people suffering from Parkinson’s disease, multiple sclerosis, amyotrophic lateral sclerosis (ALS), or Lou Gehrig’s disease, Alzheimer’s disease, spinal cord and traumatic brain injuries and concussions, he said.
These diseases and conditions often arise from the loss of brain cells. Parkinson’s disease, for example, is caused by the loss of brain cells that produce dopamine, a key neurotransmitter. Brain cell loss can lead to trembling in the hands, arms, legs, jaw and face; rigidity, or stiffness of the limbs and trunk; slowness of movement; and impaired balance and coordination, according to the National Institutes of Health.
The next step would be to further improve the scaffold biomaterials, allowing scientists to increase the number of implanted neurons in the brain. “The more neurons we can transplant, the more therapeutic benefits you can bring to the disease,” Moghe said. “We want to try to stuff as many neurons as we can in as little space as we can.”
The idea is to “create a very dense circuitry of neurons that is not only highly functioning but also better controlled,” he said, adding that testing of mice with Parkinson’s disease is underway to see if they improve or recover from the illness.
Eventually, with continued progress, the researchers could perform studies in people. Moghe estimated that it would take 10 to 20 years to test the technology in humans.
Developing the scaffold technology and reprogramming the stem cells in the scaffolds was “very hard team work,” he said. “It took many years to get here, so there was a lot of sweat and toil.”
Aside from Moghe, study authors include: Aaron L. Carlson, Neal K. Bennett and Nicola L. Francis of the Rutgers Department of Biomedical Engineering; Apoorva Halikere of the Rutgers Department of Neuroscience and Cell Biology and the Child Health Institute of New Jersey at the Rutgers Robert Wood Johnson Medical School; Ronald P. Hart, Stephen Clarke and Kenneth Paradiso of the Department of Cell Biology and Neuroscience at Rutgers; Jennifer C. Moore of the Human Genetics Institute of New Jersey; Marius Wernig at the Stanford University School of Medicine in California; Joachim Kohn of the Rutgers Department of Chemistry and Chemical Biology, New Jersey Center for Biomaterials; and Zhiping P. Pang of the Department of Neuroscience and Cell Biology and Child Health Institute of New Jersey at Rutgers Robert Wood Johnson Medical School.