Overexpression of preeclampsia induced microRNA-26a-5p leads to proteinuria in zebrafish

Sci Rep. 2018 Feb 26;8(1):3621. doi: 10.1038/s41598-018-22070-w.

Abstract

So far the pathomechanism of preeclampsia in pregnancy is focussed on increased circulating levels of soluble fms-like tyrosin kinase-1 (sFLT-1) that neutralizes glomerular VEGF-A expression and prevents its signaling at the glomerular endothelium. As a result of changed glomerular VEGF-A levels endotheliosis and podocyte foot process effacement are typical morphological features of preeclampsia. Recently, microRNA-26a-5p (miR-26a-5p) was described to be also upregulated in the preeclamptic placenta. We found that miR-26a-5p targets VEGF-A expression by means of PIK3C2α in cultured human podocytes and that miR-26a-5p overexpression in zebrafish causes proteinuria, edema, glomerular endotheliosis and podocyte foot process effacement. Interestingly, recombinant zebrafish Vegf-Aa protein could rescue glomerular changes induced by miR-26a-5p. In a small pilot study, preeclamptic patients with podocyte damage identified by podocyturia, expressed significantly more urinary miR-26a-5p compared to healthy controls. Thus, functional and ultrastructural glomerular changes after miR-26a-5p overexpression can resemble the findings seen in preeclampsia and indicate a potential pathophysiological role of miR-26a-5p in addition to sFLT-1 in this disease.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cells, Cultured
  • Female
  • Humans
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Podocytes / metabolism
  • Pre-Eclampsia / genetics
  • Pre-Eclampsia / metabolism*
  • Pregnancy
  • Proteinuria / etiology*
  • Proteinuria / metabolism*
  • Zebrafish

Substances

  • MicroRNAs