The human central nervous system  have the capacity to regenerate after injury or illness is limit; and the resulting functional impairments carry a vast social and personal burden. In glaucoma, degeneration of retinal ganglion cells (RGCs) the axons of which form the optic nerve; which is connecting the retina to the brain leads to permanent blindness; there is currently no effective treatment for RGC degeneration. Now, University of Nebraska Medical Center researcher Iqbal Ahmad and colleagues show that human RGCs can be regenerate in an in vitro setting help by lessons learned in rodent models. The discovery is detail in the journal Development.

People who suffer from glaucoma

“This finding could lead to new methods of screening for drugs and genes impact by glaucoma to help treat; and possibly reverse vision loss in people suffering from the disease,” said Dr. Ahmad, a professor in the department of ophthalmology and visual sciences at UNMC. RGCs are key in sending messages to the brain through a series of synapses; and connections that tell us what the eye sees. In people who suffer from glaucoma, it’s the degeneration of these cells that lead to loss of sight, Dr. Ahmad said.

Dr. Ahmad and his team of investigators found that when the mTOR signaling pathway; present in all cell types and essential for cell survival, is activate in RGCs the cells begin to regenerate and thrive. The researchers used a microfluidic chamber system to see how axons regenerate after axotomy.

Silent robber of vision

Dr. Ahmad has spent 25 years studying the stem cell approach to understand and treat glaucoma; which is called a silent robber of vision because it strikes without warning or any noticeable symptoms. Glaucoma is the second leading cause of irreversible blindness; and affects more than 3 million people in the United States and 60 million people worldwide.

The significance of this work, Dr. Ahmad said, is that it is done using human adult pluripotent stem cells; whereas previous work was done only in rats and mice. While these models provide insight into better understanding the disease progression of glaucoma; research using human RGCs will translate more readily when it comes to potential drug and gene therapies, he said. His lab has already applied for a patent on the technology that shows how RGCs can be regenerate. “We are hopeful this process will bring us one step closer to recapturing  the sight in those patients who suffer from vision loss due to glaucoma,” he said.