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Summary:
"A promising study reveals transplanted healthy glial cells can outcompete and replace diseased or aged brain cells, potentially restoring normal brain function. This breakthrough suggests a broad potential for the treatment of neurodegenerative diseases, such as Huntington’s disease, ALS, and some genetic schizophrenia."
“Things are fairly far along. We still need to be absolutely sure of the long-term safety of the cells after we transplant them. But we are expecting to have that data in about a year and a half,” says Steve Goldman and adds:
“At that point we hopefully can get the approval to go into patients, so I would hope that we could initiate trials of this approach with humans within two years from now.”
Achieving brain clearance and preventing neurodegenerative diseases—A glymphatic perspective
Aspen Neuroscience Trial - Autologous Neuronal Cell Replacement 
Stem Cell-Based Treatment for Parkinson's Disease -- Where do we stand?
