Notoginsenoside R1 protects WI-38 cells against lipopolysaccharide-triggered injury via adjusting the miR-181a/TLR4 axis.

Abstract

Notoginsenoside R1 (NGR1) is a neoteric phytoestrogen extractedfrom Panax notoginseng, andpossesses comprehensive pharmacological functions in multitudinous ailments. But, whether NGR1 is utilizedin neonatal pneumonia is not clear. Thisresearch study aspired to disclose the protective activity of NGR1 in neonatal pneumonia. WI-38 cells were co-stimulated with NGR1 and lipopolysaccharide (LPS, 10 ng/mL), CCK-8 and flow cytometry assays were implemented for cell viability and apoptosis assessment. Real-time quantitative plymerase chain reaction (RT-qPCR), enzyme-linked immunosorbent assay (ELISA), and Western blot analysis were executed for inflammatory cytokinedetermination. MicroRNA-181a (miR-181a) expression was evaluated through RT-qPCR, simultaneously, the impactof miR-181a was estimated in NGR1 and LPS co-managed cells. Dual luciferase report assay was performed to disclose the relationbetween miR-181a and Toll-like receptor 4 (TLR4). The nuclear factor-κB (NF-κB) and TAK1/JNK pathways were ultimately appraised. We found that NGR1 decreasedcell viability, evoked apoptosis and impeded interleukin-1β (IL-1β), IL-6, and tumor necrosis factor-α (TNF-α) expression and secretions in LPS-managed WI-38 cells. MiR-181a expression was enhanced by NGR1, and miR-181a inhibition inverted the impacts of NGR1 in LPS-managed WI-38 cells. Besides, TLR4 was predictedto be a firsthand direct target of miR-181a. Furthermore, NGR1 hindered NF-κB and TAK1/JNK pathways through modulating TLR4.These discoveries disclosed the fact that NGR1 protected WI-38 cells against LPS-triggered injury via adjusting the miR-181a/TLR4 and NF-κB and TAK1/JNK pathways.