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PMicroRNA-124a regulates LPS-induced septic cardiac dysfunction by targeting STX2.

Biotechnol. Lett.2017 Sep;39(9):1335-1342. Epub 2017 May 30
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摘要


OBJECTIVE:To examine the role of miR-124a in LPS-induced septic cardiac insufficiency where underlying mechanism is unclear. RESULTS:Expression of miR-124a was decreased in myocardium of LPS-induced septic cardiac dysfunction model. miR-124a antagomiR or agomiR were injected via tail vein to induce miR-124a-dysregulated model. miR-124a antagomiR aggravated LPS-induced cardiac dysfunction and apoptosis, while miR-124a agomiR had the opposite effect. Syntaxin-2 (STX2) was indicated as a candidate target gene by bioinformatic software. Further experiments confirmed that STX2 was downregulated in miR-124a agomiR-treated rats but upregulated in miR-124a antagomiR-treated rats, and STX2 inhibition could strongly block the miR-124a antagomiR-associated increase in cell apoptosis. Luciferase reporter activity assay indicated that STX2 was a direct target of miR-124a. Serological detection reveled that miR-124a was down-regulated in the plasma of septic cardiac dysfunction rats. CONCLUSIONS:miR-124a aggravates LPS-induced cardiac dysfunction and the miR-124a/STX2 pathway might serve as the potential diagnostic and therapeutic targets for septic cardiac dysfunction.

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