Upstate Medical University researchers identify barrier to retinal neuron regeneration

Researchers at Upstate Medical University, part of the State University of New York, have identified a key reason why aging retinas struggle to regenerate lost neurons. The study, published in the Proceedings of the National Academy of Sciences (PNAS), focuses on glia cells, which support and nourish retinal neurons.

While scientists have successfully reprogrammed glia cells into new neurons in young mice, Dr. Levi Todd’s team found that this efficiency drops significantly in aged retinal tissue. A primary factor is increased inflammation associated with aging. As the barrier that limits immune system infiltration into neural tissue weakens with age, the resulting inflammatory environment hinders regeneration.

Testing showed that using anti-inflammatory steroids partially restored the ability of aged retinas to create new neurons. This suggests that controlling inflammation could be a vital pathway for improving the effectiveness of regenerative therapies for diseases such as glaucoma.