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ER stress contributes to ischemia-induced cardiomyocyte apoptosis.

Authors: Szegezdi, E  Duffy, A  O'Mahoney, ME  Logue, SE  Mylotte, LA  O'Brien, T  Samali, A 
Citation: Szegezdi E, etal., Biochem Biophys Res Commun. 2006 Nov 3;349(4):1406-11. Epub 2006 Sep 12.
Pubmed: (View Article at PubMed) PMID:16979584
DOI: Full-text: DOI:10.1016/j.bbrc.2006.09.009

Myocardial ischemia is a severe stress condition that leads to loss of cardiomyocytes. The cell loss is attributed to apoptosis, although the exact mechanisms involved are only partially defined, which limits therapeutic opportunities. Here, we show caspase activation and apoptosis in neonatal rat cardiomyocyte cultures subjected to simulated ischemia by serum, glucose, and oxygen deprivation (SGO). Caspase activation was preceded by endoplasmic reticulum (ER) stress and the activation of the unfolded protein response (UPR), detected by the induction of Grp78, induction and splicing of XBP1, and phosphorylation of eukaryotic initiation factor 2-alpha (eIF2alpha). At a later time the ER stress response switched from UPR and cytoprotective response to a pro-apoptotic response as demonstrated by the upregulation of CHOP and processing of pro-caspase-12. Thus, we provide evidence that the ER can generate and propagate apoptotic signals in response to ischemic stress and this pathway is therefore a novel target for prevention of ischemia-mediated cardiomyocyte loss.


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RGD Object Information
RGD ID: 2311465
Created: 2009-07-17
Species: All species
Last Modified: 2009-07-17
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.