Proposed mechanisms that would initiate apoptotic programs include
potentiating oxidative injury, sensitizing the cell to trophic factor deficiency,
altering protein trafficking in the rough endoplasmic reticulum, altering APP
metabolism, and influencing signal transduction, particularly G-protein
related. A strong case has been made for a common mechanism based on
G-protein signaling for production of apoptosis in AD without necessarily
involving the extracellular events of AB deposition.
2
However, there is also
evidence for increased oxidative injury in AD related to intra- and extracellular
protein–protein interactions, particularly with APP and its fragments,
presenilin, and oxidative priming events all working together to sensitize
the cell for apoptosis.
90-104