MicroRNA-410-3p Binds to TLR2 and Alleviates Myocardial Mitochondrial Dysfunction and Chemokine Production in LPS-Induced Sepsis.

MicroRNA-410-3p Binds to TLR2 and Alleviates Myocardial Mitochondrial Dysfunction and Chemokine Production in LPS-Induced Sepsis.
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DOI:
10.1016/j.omtn.2020.07.031
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发表时间:
2020-12-04
期刊:
Molecular therapy. Nucleic acids
影响因子:
--
通讯作者:
Shang F
Shang F
中科院分区:
其他
文献类型:
--
作者:
Zuo T;Tang Q;Zhang X;Shang F

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据报道,线粒体功能障碍和趋化因子的产生与脓毒症的发病机制有关。我们最初的生物信息学分析确定了脓毒症中差异表达的 TLR2 和上游调节性 microRNA-410-3p (miR-410-3p)。因此,本研究旨在表征 miR-410-3p 调节脂多糖 (LPS) 诱导的小鼠体内和体外心肌细胞线粒体功能障碍和趋化因子产生的潜在机制。接下来,我们发现在 LPS 诱导的小鼠和心肌细胞中 miR-410-3p 下调,而 TLR2 上调。此外,miR-410-3p 被证实能够靶向并抑制 TLR2 的表达。此后,进行功能获得或丧失实验以研究 miR-410-3p 和 TLR2 对线粒体功能和趋化因子产生的影响。研究发现,TLR2 敲低或 miR-410-3p 过表达可减轻线粒体膜损伤和线粒体肿胀,此外还能提高体内和体外三磷酸腺苷、线粒体膜电位以及 CCL7、CCL5、CXCL1 和 CXCL9 的表达水平。总之,miR-410-3p 介导的 TLR2 抑制减轻了 LPS 诱导的实验性脓毒症中的线粒体功能障碍并减少了趋化因子的产生。因此,miR-410-3p的过度表达可能代表治疗脓毒症引起的心肌损伤的潜在策略。这项研究揭示了 miR-410-3p 在预防线粒体功能障碍和趋化因子产生中的作用的意义和机制,并为脓毒症提供了潜在的预后标志物和治疗靶点。
Mitochondrial dysfunction and chemokine production have been reported to be involved in the pathogenesis of sepsis. Our initial bioinformatics analysis identified differentially expressed TLR2 in sepsis and the upstream regulatory microRNA-410-3p (miR-410-3p). Hence, the current study was performed to characterize the potential mechanism by which miR-410-3p modulates mitochondrial dysfunction and chemokine production in lipopolysaccharide (LPS)-induced mice in vivo and cardiomyocytes in vitro. Next, we identified that miR-410-3p was downregulated, while TLR2 was upregulated in LPS-induced mice and cardiomyocytes. In addition, miR-410-3p was confirmed to target and inhibit the TLR2 expression. Thereafter, gain- or loss-of-function experiments were conducted to investigate the effect of miR-410-3p and TLR2 on mitochondrial function and chemokine production. TLR2 knockdown or miR-410-3p overexpression was found to alleviate mitochondrial membrane damage and mitochondrial swelling, in addition to augmenting the levels of adenosine triphosphate, mitochondrial membrane potential, and the expression levels of CCL7, CCL5, CXCL1, and CXCL9 in vivo and in vitro. In conclusion, miR-410-3p-mediated TLR2 inhibition alleviated mitochondrial dysfunction and reduced chemokine production in LPS-induced experimental sepsis. Therefore, the overexpression of miR-410-3p may represent a potential strategy for the treatment of sepsis-induced myocardial injury. This study reveals a significance and mechanism of miR-410-3p action in preventing mitochondrial dysfunction and chemokine production and offers a potential prognostic marker and a therapeutic target for sepsis.
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