Hyperoside Alleviates High Glucose-Induced Proliferation of Mesangial Cells through the Inhibition of the ERK/CREB/miRNA-34a Signaling Pathway

Le Zhang; Qian Dai; Lanlan Hu; Hua Yu; Jing Qiu; Jiyin Zhou; Min Long; Shiwen Zhou; Kebin Zhang

doi:10.1155/2020/1361924

Hyperoside Alleviates High Glucose-Induced Proliferation of Mesangial Cells through the Inhibition of the ERK/CREB/miRNA-34a Signaling Pathway

Int J Endocrinol. 2020 Jul 21:2020:1361924. doi: 10.1155/2020/1361924. eCollection 2020.

Authors

Le Zhang¹, Qian Dai², Lanlan Hu¹, Hua Yu², Jing Qiu², Jiyin Zhou¹, Min Long³, Shiwen Zhou¹, Kebin Zhang²

Affiliations

¹ National Drug Clinical Trial Institution, Xinqiao Hospital, Army Medical University, Chongqing 400037, China.
² Center of Medical Experiment Technology, Xinqiao Hospital, Army Medical University, Chongqing 400037, China.
³ Preventive Medicine Department, Xinqiao Hospital, Army Medical University, Chongqing 400037, China.

Abstract

Purpose: Hyperoside, a flavonoid isolated from conventional medicinal herbs, has been demonstrated to exert a significant protective effect in diabetic nephropathy. This study aimed to determine the underlying mechanisms, by which hyperoside inhibits high glucose-(HG-) induced proliferation in mouse renal mesangial cells.

Methods: Mouse glomerular mesangial cells line (SV40-MES13) was used to study the inhibitory effect of hyperoside on cell proliferation induced by 30 mM glucose, which was used to simulate a diabetic condition. Viable cell count was assessed using the Cell Counting Kit-8 and by the 5-ethynyl-20-deoxyuridine incorporation assay. The underlying mechanism involving miRNA-34a was further investigated by quantitative RT-PCR and transfection with miRNA-34a agomir. The phosphorylation levels of extracellular signal-regulated kinases (ERKs) and cAMP-response element-binding protein (CREB) were measured by Western blotting. The binding region and the critical binding sites of CREB in the miRNA-34a promoter were investigated by the chromatin immunoprecipitation assay and luciferase reporter assay, respectively.

Results: We found that hyperoside could significantly decrease HG-induced proliferation of SV40-MES13 cells in a dose-dependent manner, without causing obvious cell death. In addition, hyperoside inhibited the activation of ERK pathway and phosphorylation of its downstream transcriptional factor CREB, as well as the miRNA-34a expression. We further confirmed that CREB-mediated regulation of miRNA-34a is dependent on the direct binding to specific sites in the promoter region of miRNA-34a.

Conclusion: Our cumulative results suggested that hyperoside inhibits the proliferation of SV40-MES13 cells through the suppression of the ERK/CREB/miRNA-34a signaling pathway, which provides new insight to the current investigation on therapeutic strategies for diabetic nephropathy.