Abstract
Cardiomyocyte death is a major event of myocardial infarction. Previously, we and others have shown that E3 ligase-mediated protein turnover plays a critical role in cardiac injury. In this study, we sought to determine the role of a newly identified E3 ligase, neuregulin receptor degradation protein-1 (Nrdp1), on cardiac ischemia/reperfusion (I/R) injury. I/R injury markedly upregulated Nrdp1 expression in heart tissue. To elucidate the role of Nrdp1 in I/R-induced cardiac injury, neonatal cardiomyocytes were infected with adenoviral constructs expressing wild-type, dominant-negative Nrdp1 genes. Increased Nrdp1 expression enhanced I/R-induced cardiomyocyte apoptosis and inflammation as compared with the green fluorescent protein (GFP) control; these effects were attenuated by overexpression of a dominant-negative Nrdp1 (C34S/H36Q). Furthermore, cardiac-specific Nrdp1 overexpression in vivo in mouse significantly increased infarct size, the number of TUNEL-positive nuclei and inflammatory cells, as well as mortality, as compared with wild-type mice after I/R injury. The mechanisms underlying these effects were associated with the downregulation of an Nrdp1 substrate, ErbB3, accompanied by suppression of its downstream targets AKT, ERK1/2, and activation of p38 and JNK1/2. Together, these results provide evidence for an important role for Nrdp1 in regulating I/R-induced cardiac injury. Nrdp1 may constitute a new therapeutic target for ameliorating the I/R-induced cardiac injury.
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Acknowledgments
This work was supported by grants from China National Natural Science Funds for Distinguished Young Scholars (81025001; HL, 30888004; JD) and the Beijing high-level talents program (PHR20110507; HL).
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Y. Zhang and Y. Zeng contributed equally to this work.
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395_2011_157_MOESM2_ESM.eps
ErbB3 receptor was expressed in the mouse heart. a The expression levels of ErbB3 mRNA in the hearts of wild-type (WT) and TG6 mice were detected by RT-PCR. Lane 1: sterilized distilled water used instead of DNA template; Lanes 2-5: ErbB3 used as DNA template. b Western blot analysis of endogenous ErbB3 protein levels from the hearts of WT and TG6 mice. c Left-ventricular sections from WT and TG6 mice stained with anti-IgG (left) or anti-ErbB3 (middle and right) antibody. Brown staining indicates ErbB3 expression. Bar = 50 μm (EPS 8554 kb)
395_2011_157_MOESM3_ESM.eps
Effect of Nrdp1 overexpression on other substrates of Nrdp1 after ischemia/reperfusion (I/R). Western blot analysis of protein levels of BRUCE, MyD88 and TBK1 from at the border area of the myocardium from WT and TG6 mice (n=5). A representative blot is shown for each condition (EPS 1004 kb)
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Zhang, Y., Zeng, Y., Wang, M. et al. Cardiac-specific overexpression of E3 ligase Nrdp1 increases ischemia and reperfusion-induced cardiac injury. Basic Res Cardiol 106, 371–383 (2011). https://doi.org/10.1007/s00395-011-0157-0
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DOI: https://doi.org/10.1007/s00395-011-0157-0