4.7 Article

miR-18a Contributes to Preeclampsia by Downregulating Smad2 (Full Length) and Reducing TGF-β Signaling

Journal

MOLECULAR THERAPY-NUCLEIC ACIDS
Volume 22, Issue -, Pages 542-556

Publisher

CELL PRESS
DOI: 10.1016/j.omtn.2020.09.019

Keywords

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Funding

  1. National Key Research and Development Program of China [2016YFC1000401, 2017YFC1001404, 2018YFC10041002]
  2. National Natural Science Foundation of China [81730040]

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The study investigated the regulation of Smad2 by miR-18a and its role in preeclampsia (PE). Bioinformatics analysis showed that both Smad2 and Smad3 were the predicted targets for miR-18a. Mass spectrum analysis showed that two mature Smad2 isoforms existed in human placenta: full length, Smad2(FL), and that lacking exon3, Smad2(Aexon3). The protein level of Smad2(FL), but not Smad2(Aexon3) or Smad3, was significantly increased in severe PE (sPE) placenta, which was inversely correlated with the level of miR-18a. Elevated Smad2(FL) phosphorylation level appeared in sPE placenta, and Smad2 was colocalized with miR-18a in various subtypes of trophoblasts in human placenta. Smad2(FL) was validated as the direct target of miR-18a in HTR8/SVneo cells. miR-18a enhanced trophoblast cell invasion, which was blocked by the overexpression of Smad2(FL). Furthermore, overexpression of miR-18a repressed Smad2 activation and the inhibition of trophoblast cell invasion by transforming growth factor-beta (TGF-beta). In conclusion, our results suggest that miR-18a inhibits the expression of Smad2(FL), but not Smad2(Aexon3) or Smad3, which can reduce TGF-beta signaling, leading to the enhancement of trophoblast cell invasion. A lack of miR-18a, which results in the upregulation of Smad2(FL), contributes to the development of PE.

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