For more than two decades, researchers have tried to regenerate the injured optic nerve using different growth factors and/or agents that overcome natural growth inhibition. They’ve had partial success, sometimes even restoring rudimentary elements of vision in mouse models.
But at best, these methods get only about 1 percent of the injured nerve fibers to regenerate and reconnect the retina to the brain. That’s because most of the damaged cells, known as retinal ganglion cells (RGCs), eventually die, says Larry Benowitz, PhD, of the F.M. Kirby Neurobiology Center at Boston Children’s Hospital.
Benowitz and colleagues now show a surprising new approach that gets RGCs to live longer and regenerate robustly: using chelating agents to bind up zinc that’s released as a result of the injury.
These studies, too, were done in mice. If the findings hold up in human studies, they could spell hope for people with optic nerve injury due to trauma, glaucoma or other causes, and possibly even spinal cord injury. …