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• W2966820966 abstract "Abstract Aim Myocardial ischaemia/reperfusion (I/R) produces structural and functional alterations depending on the duration of ischaemia. Brief ischaemia followed by reperfusion causes reversible contractile dysfunction (stunned heart) but long‐lasting ischaemia followed by reperfusion can result in irreversible injury with cell death. Events during I/R can alter endoplasmic reticulum (ER) function leading to the accumulation of unfolded/misfolded proteins. The resulting ER stress induces activation of several signal transduction pathways, known as unfolded protein response (UPR). Experimental evidence shows that UPR contributes to cell death in irreversible I/R injury; however, there is still uncertainty for its occurrence in the stunned myocardium. This study investigated the ER stress response and its functional impact on the post‐ischaemic cardiac performance of the stunned heart. Methods Perfused rat hearts were subjected to 20 minutes of ischaemia followed by 30 minutes of reperfusion. UPR markers were evaluated by qRT‐PCR and western blot. Post‐ischaemic mechanical recovery was measured in absence and presence of two chemical chaperones: tauroursodeoxycholic acid (TUDCA) and 4‐phenylbutyric acid (4‐PBA). Results Analysis of mRNA and protein levels of various ER stress effectors demonstrated that different UPR signalling cascades, involving both pro‐survival and pro‐apoptotic pathways, are activated. Inhibition of the UPR with chemical chaperones improved the post‐ischaemic recovery of cardiac mechanical function without affecting the I/R‐induced increase in oxidative stress. Conclusion Our results suggest that prevention of ER stress by chemical chaperones could be a therapeutic tool to limit deterioration of the contractile function in clinical settings in which the phenomenon of myocardial stunning is present." @default.
• W2966820966 created "2019-08-13" @default.
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• W2966820966 date "2019-08-25" @default.
• W2966820966 modified "2023-10-18" @default.
• W2966820966 title "Chemical chaperones improve the functional recovery of stunned myocardium by attenuating the endoplasmic reticulum stress" @default.
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• W2966820966 doi "https://doi.org/10.1111/apha.13358" @default.
• W2966820966 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31385408" @default.
• W2966820966 hasPublicationYear "2019" @default.
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