From BBC News:
The tantalising prospect of treating a range of brain diseases, such as Alzheimer's and Parkinson's, all with the same drug, has been raised by UK researchers.
In a study, published in Nature, they prevented brain cells dying in mice with prion disease.This treatment may apply to Alzheimer's, Parkinson's, and Huntington's disease. Stay tuned.
It is hoped the same method for preventing brain cell death could apply in other diseases.