A potential turning point in Alzheimer's - Preventing brain tissue death 10/09/2013 - 00:00 The discovery of the first chemical to prevent the death of brain tissue in a neurodegenerative disease has been hailed as an exciting and historic moment in medical research.More work is needed to develop a drug that could be taken by patients. But scientists say a resulting medicine could treat Alzheimer's, Parkinson's, Huntington's and other diseases.