Induction of ER Stress in Response to Oxygen-glucose Deprivation of Cortical Cultures Involves the Activation of the PERK and IRE-1 Pathways and of Caspase-12

Overview

Journal Cell Death Dis

Specialties Cell Biology
General Medicine

Date 2011 Apr 29

PMID 21525936

Citations 80

Authors

N Badiola

C Penas

A Minano-Molina

B Barneda-Zahonero

R Fado

G Sanchez-Opazo

J X Comella

J Sabria

C Zhu

K Blomgren

C Casas

J Rodriguez-Alvarez

Affiliations

Soon will be listed here.

Abstract

Disturbance of calcium homeostasis and accumulation of misfolded proteins in the endoplasmic reticulum (ER) are considered contributory components of cell death after ischemia. However, the signal-transducing events that are activated by ER stress after cerebral ischemia are incompletely understood. In this study, we show that caspase-12 and the PERK and IRE pathways are activated following oxygen-glucose deprivation (OGD) of mixed cortical cultures or neonatal hypoxia-ischemia (HI). Activation of PERK led to a transient phosphorylation of eIF2α, an increase in ATF4 levels and the induction of gadd34 (a subunit of an eIF2α-directed phosphatase). Interestingly, the upregulation of ATF4 did not lead to an increase in the levels of CHOP. Additionally, IRE1 activation was mediated by the increase in the processed form of xbp1, which would be responsible for the observed expression of edem2 and the increased levels of the chaperones GRP78 and GRP94. We were also able to detect caspase-12 proteolysis after HI or OGD. Processing of procaspase-12 was mediated by NMDA receptor and calpain activation. Moreover, our data suggest that caspase-12 activation is independent of the unfolded protein response activated by ER stress.

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