4.4 Article

MicroRNA-146a overexpression alleviates intestinal ischemia/reperfusion-induced acute lung injury in mice

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SPANDIDOS PUBL LTD
DOI: 10.3892/etm.2021.10369

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intestinal ischemia; reperfusion; acute lung injury; microRNA-146a; inflammation; apoptosis

资金

  1. Foundation of Shenzhen Maternity and Child Healthcare Hospital [FYB2017015]

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The study revealed that pre-treatment with the miR-146a overexpression vector alleviated intestinal I/R-induced acute lung injury in mice, reducing the expression levels of inflammatory cytokines and apoptosis-related proteins.
Previous studies have shown that microRNAs (miRs), such as miR-146a play an important role in the pathogenesis of intestinal ischemia/reperfusion (I/R)-induced injury; however, the role of miR-146a in intestinal I/R-induced acute lung injury has not been elucidated. An intestinal I/R-induced injury mouse model was established in the present study by clamping the superior mesenteric artery and expression levels of miR-146a in intestinal and lung tissue samples were evaluated using reverse transcription-quantitative PCR (RT-qPCR). Intestinal and lung histopathological characteristics in mice with intestinal I/R-induced injury were assessed by hematoxylin and eosin staining, and mRNA and protein expression levels in intestinal and lung tissue samples were evaluated using RT-qPCR and western blotting, respectively. miR-146a expression was significantly downregulated in the intestinal and lung tissue samples of mice with intestinal I/R-induced injury. Intestinal I/R injury-induced histopathological changes in the lung and intestines, and pulmonary edema in mice transduced with an adenoviral miR-146a-overexpression vector (the miR-146a overexpression group) were alleviated. mRNA expression levels of TNF-alpha, IL-1 beta, IFN-gamma and TGF-beta 1, and protein expression levels of TNF receptor-associated factor 6, phosphorylated-p65 NF-kappa B, cleaved caspase-3 and cleaved caspase-9 in lung and intestinal tissue samples were downregulated in I/R-miR-146a-overexpressing mice, compared with those from the I/R-negative control group. Thus, the present study identified that pre-treatment with the miR-146a overexpression vector alleviated intestinal I/R-induced acute lung injury in mice.

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