title   
  

DAP-kinase is a mediator of endoplasmic reticulum stress-induced caspase activation and autophagic cell death.

Gozuacik, Devrim and Mitou, Geraldine (2008) DAP-kinase is a mediator of endoplasmic reticulum stress-induced caspase activation and autophagic cell death. (Accepted/In Press)

WarningThere is a more recent version of this item available.

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
781Kb

Official URL: http://www.nature.com/cdd/index.html

Abstract

Damage to endoplasmic reticulum (ER) homeostasis that cannot be corrected by the unfolded protein response activates cell death. Here, we identified death-associated protein kinase (DAPk) as an important component in the ER stress-induced cell death pathway. DAPk-/- mice are protected from kidney damage caused by injection of the ER stress-inducer tunicamycin. Likewise, the cell death response to ER stress-inducers is reduced in DAPk-/- primary fibroblasts. Both caspase activation and autophagy induction, events that are activated by ER stress and precede cell death, are significantly attenuated in the DAPk null cells. Notably, in this cellular setting, autophagy serves as a second cell killing mechanism that acts in concert with apoptosis, as the depletion of Atg5 or Beclin1 from fibroblasts significantly protected from ER stress-induced death when combined with caspase-3 depletion. We further show that ER stress promotes the catalytic activity of DAPk by causing dephosphorylation of an inhibitory autophosphorylation on Ser(308) by a PP2A-like phosphatase. Thus, DAPk constitutes a critical integration point in ER stress signaling, transmitting these signals into two distinct directions, caspase activation and autophagy, leading to cell death.

Item Type:Article
Subjects:Q Science > Q Science (General)
R Medicine > R Medicine (General)
R Medicine > RB Pathology
Q Science > QL Zoology
Q Science > QP Physiology
ID Code:10185
Deposited By:Devrim Gözüaçık
Deposited On:07 Nov 2008 16:14
Last Modified:27 Nov 2008 21:02

Available Versions of this Item

Repository Staff Only: item control page