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• W4361002022 startingPage "113572" @default.
• W4361002022 abstract "Long non-coding RNAs (lncRNAs) are pivotal regulators in heart disease, including myocardial ischemia/reperfusion (I/R) injury. LncRNA just proximal to XIST (JPX) is a molecular switch for X-chromosome inactivation. Enhancer of zeste homolog 2 (EZH2) is a core catalytic subunit of the polycomb repressive complex 2 (PRC2), which is involved in chromatin compaction and gene repression. This study aims to explore the mechanism of JPX regulating the expression of Sarcoplasmic/endoplasmic reticulum Ca2+ ATPase 2a (SERCA2a) by binding to EZH2 and preventing cardiomyocyte I/R damage in vivo and in vitro. First, we constructed mouse myocardial I/R and HL1 cell hypoxia/reoxygenation models, and found that JPX was low expressed in both models. JPX overexpression alleviated cardiomyocyte apoptosis in vivo and in vitro, reduced the I/R-induced infarct size in mouse hearts, lowered the serum cTnI concentration, and promoted mouse cardiac systolic function. The evidence implies that JPX can alleviate I/R-induced acute cardiac damage. Mechanistically, the FISH and RIP assays showed that JPX could bind to EZH2. The ChIP assay revealed EZH2 enrichment at the promoter region of SERCA2a. Both the EZH2 and H3K27me3 levels at the promoter region of SERCA2a were reduced in the JPX overexpression group compared to those in the Ad-EGFP group (P < 0.01). In summary, our results suggested that LncRNA JPX directly bound to EZH2 and reduced the EZH2-mediated H3K27me3 in the SERCA2a promoter region, protecting the heart from acute myocardial I/R injury. Therefore, JPX might be a potential therapeutic target for I/R injury." @default.
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• W4361002022 date "2023-06-01" @default.
• W4361002022 modified "2023-09-27" @default.
• W4361002022 title "LncRNA JPX targets SERCA2a to mitigate myocardial ischemia/reperfusion injury by binding to EZH2" @default.
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• W4361002022 doi "https://doi.org/10.1016/j.yexcr.2023.113572" @default.
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