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Preparation and In Vitro Characterization of Magnetized miR-modified Endothelial Cells
09:58

Preparation and In Vitro Characterization of Magnetized miR-modified Endothelial Cells

Published on: May 2, 2017

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FMRP regulates endothelial cell proliferation and angiogenesis via the miR-181a-CaM-CaMKII pathway

Xin Zhao1, Yang Wang2, Chao Meng1

  • 1Department of Geriatrics, Renji Hospital, School of Medicine, Shanghai Jiaotong University, No. 160 Pujian Road, Pudong New Area, Shanghai 200127, China.

Cell Biology International
|August 7, 2018
PubMed

Insights

Fragile X mental retardation protein (FMRP) regulates endothelial cell growth and blood vessel formation through the miR-181a/calmodulin pathway. This pathway is crucial for vascular integrity during inflammation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Vascular Biology

Background:

  • RNA binding proteins (RBPs) and microRNAs are key post-transcriptional gene regulators.
  • The function of Fragile X mental retardation protein (FMRP) in endothelial cells is largely uncharacterized, despite its known roles in the brain.

Purpose of the Study:

  • To investigate the role of FMRP in human umbilical vein endothelial cells (HUVECs).
  • To elucidate the molecular mechanism by which FMRP influences endothelial cell proliferation and angiogenesis.

Main Methods:

  • Knockdown and overexpression of FMRP in HUVECs.
  • Analysis of miR-181a expression and its downstream targets, including calmodulin (CaM).
  • Investigation of the CaM/CaMKII pathway activity.
  • Treatment with tumor necrosis factor-alpha (TNF-ɑ) to mimic inflammatory stimuli.

Main Results:

  • FMRP knockdown increased miR-181a expression, promoting HUVEC proliferation and angiogenesis.
  • Calmodulin (CaM) was identified as a direct downstream target of miR-181a in endothelial cells.
  • TNF-ɑ treatment reduced CaM/CaMKII pathway activity by dephosphorylating FMRP and upregulating miR-181a.
  • Overexpression of phosphorylated FMRP restored endothelial cell function impaired by TNF-ɑ.

Conclusions:

  • FMRP plays a critical role in maintaining vascular integrity in response to inflammatory stimuli.
  • The miR-181a-calmodulin-CaMKII pathway is a novel mechanism regulated by FMRP in endothelial cells.
  • This pathway represents a potential therapeutic target for inflammation-induced vascular diseases.
Keywords:
FMRPTNF-ɑangiogenesisendothelial cell proliferationmiR-181a-CaM-CaMKII pathway

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