In line with what Ray has written and in contrast to the dogma of mainstream science, prion disease such as Alzheimers and mad cow disease seem to be reversible, at least by yeast. The mechanism of action is the activation of the heat shock proteins.
http://phys.org/news/2014-12-yeast-cells-prions.html
http://phys.org/news/2014-12-yeast-cells-prions.html