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The protective role of NR4A3 in acute myocardial infarction by suppressing inflammatory responses via JAK2-STAT3/NF-κB pathway.

Biochem. Biophys. Res. Commun.2019 Oct 01;517(4):697-702. Epub 2019 Aug 06
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摘要


Inflammatory responses play a critical role in left ventricular remodeling after acute myocardial infarction (AMI). NR4A3, a member of the NR4A orphan nucleus receptor family, has recently emerged as a therapeutic target for treatment of inflammation. This aim of this study is to explore the therapeutic effect of NR4A3 in cardiac remodeling post AMI. Male C57BL/6 mice were administered with lentiviral over-expression of NR4A3 (lenti-NR4A3) or empty vector (lenti-con) 7 days before coronary artery ligation. H9c2 cardiomyocytes deprived of serum were used to mimic ischemic conditions in vivo. Lenti-NR4A3 treatment significantly repressed neutrophil infiltration in the myocardium, reduced infarct size, and attenuated the reduction of left ventricular function after AMI. Furthermore, NR4A3 over-expression inhibited the NF-κB (IκB) signaling by decreasing IκBα phosphorylation and by inhibiting the translocation of p65 to the nucleus. Meanwhile, NR4A3 over-expression also increases the activity of signaling in mouse hearts after AMI. The inhibitory effect of NR4A3 on NF-κB activation was almost completely abolished by the JAK2 inhibitor AG490, indicating that NR4A3 prevented serum deprivation induced NF-κB activation in a dependent manner. These findings provide novel evidence that NR4A3 could inhibit post-AMI inflammation responses via signaling and may well be a therapeutic target for cardiac remodeling after AMI.

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