Increased NDRG1 expression attenuate trophoblast invasion through ERK/MMP-9 pathway in preeclampsia

•NDRG1 was upregulated in the placentas of pregnancies complicated with early-onset and late-onset preeclampsia.•NDRG1 would lead to a significantly decreased invasion of JEG-3 cells.•MMP-2, MMP-9 and phosphorylated of ERK protein in NDRG1 silenced JEG-3 cells was upregulated.

ObjectiveThe aim of this study was to investigate the expression of N-myc downstream-regulated gene1(NDRG1)in the placentas of pregnancies complicated with early-onset and late-onset preeclampsia (PE) and its underlying mechanism on the pathophysiology of PE.MethodsThe expressions of NDRG-1 in placentas of pregnancies complicated with early-onset PE and late-onset PE were detected using immunohistochemistry, western blot assays and fluorescence quantitative PCR. The expressions of MMP-2, MMP-9 and ERK1/2 protein were detected by western blot analysis and cell invasion assay was performed using transwell chambers in NDRG1 silenced JEG-3 cells.ResultsCompared with the normal term pregnancies, the expression of both NDRG1 mRNA and protein were significantly high in placentas from PE, and the expression of NDRG1 in early-onset PE was higher than that in late-onset PE. In NDRG1-silenced JEG-3 cells, MMP-2, MMP-9 and phosphorylation of ERK1/2 protein increased obviously and the number of cells that penetrated the membrane increased.ConclusionUpregulation of NDRG1 is associated with impaired trophoblast invasion in PE by inhibition ERK/MMP-2 and MMP-9 Pathway.