Endoplasmic reticulum stress impairs cardiomyocyte contractility through JNK-dependent upregulation of BNIP3

International Journal of Cardiology
Luiz Henrique Marchesi BoziPatricia Chakur Brum

Abstract

Disruption of endoplasmic reticulum (ER) homeostasis is a common feature of cardiac diseases. However, the signaling events involved in ER stress-induced cardiac dysfunction are still elusive. Here, we uncovered a mechanism by which disruption of ER homeostasis impairs cardiac contractility. We found that ER stress is associated with activation of JNK and upregulation of BNIP3 in a post-myocardial infarction (MI) model of cardiac dysfunction. Of interest, 4-week treatment of MI rats with the chemical ER chaperone 4-phenylbutyrate (4PBA) prevented both activation of JNK and upregulation of BNIP3, and improved cardiac contractility. We showed that disruption of ER homeostasis by treating adult rat cardiomyocytes in culture with tunicamycin leads to contractile dysfunction through JNK signaling pathway. Upon ER stress JNK upregulates BNIP3 in a FOXO3a-dependent manner. Further supporting a BNIP3 mechanism for ER stress-induced deterioration of cardiac function, siRNA-mediated BNIP3 knockdown mitigated ER stress-induced cardiomyocyte dysfunction by reestablishing sarcoplasmic reticulum Ca2+ content. Collectively, our data identify JNK-dependent upregulation of BNIP3 as a critical process involved in ER stress-induced cardiomyocyte ...Continue Reading

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Citations

Mar 19, 2019·Journal of Cellular Biochemistry·Peng WuYibing Wang
Jan 20, 2019·Nature Communications·Julio C B FerreiraDaria Mochly-Rosen
Jun 9, 2020·Frontiers in Endocrinology·Xiaoqiang TangHou-Zao Chen
Feb 24, 2021·Nature Reviews. Cardiology·Jun RenYingmei Zhang
Jul 27, 2021·Frontiers in Cell and Developmental Biology·Ming YangLin Sun

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