Mediators of endoplasmic reticulum stress-induced apoptosis.
The efficient functioning of the endoplasmic reticulum (ER) is essential for most cellular activities and survival. Conditions that interfere with ER function lead to the accumulation and aggregation of unfolded proteins. ER transmembrane receptors detect the onset of ER stress and initiate the unfolded protein response (UPR) to restore normal ER function. If the stress is prolonged, or the adaptive response fails, apoptotic cell death ensues. Many studies have focused on how this failure initiates apoptosis, as ER stress-induced apoptosis is implicated in the pathophysiology of several neurodegenerative and cardiovascular diseases. In this review, we examine the role of the molecules that are activated during the UPR in order to identify the molecular switch from the adaptive phase to apoptosis. We discuss how the activation of these molecules leads to the commitment of death and the mechanisms that are responsible for the final demise of the cell.
Szegezdi
Eva
E
Department of Biochemistry and National Centre for Biomedical Engineering Science, National University of Ireland, University Road, Galway, Ireland.
Logue
Susan E
SE
Gorman
Adrienne M
AM
Samali
Afshin
A
D000818:Animals; D017209:Apoptosis; D004721:Endoplasmic Reticulum / Q000502:physiology*; D006801:Humans; D051379:Mice; D008954:Models, Biological; D018832:Molecular Chaperones; D018384:Oxidative Stress; D017510:Protein Folding; D021381:Protein Transport; D015398:Signal Transduction
D018832:Molecular Chaperones