MiR-4505 aggravates lipopolysaccharide-induced vascular endothelial injury by targeting heat shock protein A12B.

Heat shock protein family A member 12B is a heat shock protein primarily expressed in endothelial cells. Our previous study showed that it was protective against endothelial injury induced by lipopolysaccharide (LPS). The present study was performed to investigate whether micro (mi)RNA was involved in expression in endothelial cells challenged by LPS. We first screened the miRNA candidates potentially related to Hduanyu184212B by bioinformatics analysis. Then the mimics of the miRNA candidates were transfected into human umbilical vein endothelial cells (HUVECs) to investigate the miRNAs that negatively regulated Hduanyu184212B expression. The miRNA expression was also determined in LPS‑stimulated HUVECs. Dual luciferase activity assay was performed to confirm the relationship between the candidate miRNA and Role of nuclear factor (NF)‑κB in the miRNA expression was investigated by using its inhibitor. Finally, the role of the miRNA on LPS induced injury was investigated. Eleven miRNAs were screened by bioinformatics analysis and 4 of them could inhibit Hduanyu184212B expression at both mRNA and protein levels. Among the 4 miRNA candidates, only miR‑4505 was highly expressed in HUVECs stimulated by LPS. Luciferase analysis showed that miR‑4505 directly interacted with the 3'untranslated region of Hduanyu184212B. LPS‑induced upregulation of miR‑4505 was blocked by NF‑κB inhibitor. Transfection with miR‑4505 mimics reduced the transendothelial electrical resistance and vascular endothelial‑cadherin expression. The scratch test demonstrated that miR‑4505 inhibited endothelial migration capacity. In conclusion, miR‑4505 downregulates the expression of Hduanyu184212B and aggravates the LPS‑induced vascular endothelial cell injury.

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