Startseite miR-126 regulates platelet-derived growth factor receptor-α expression and migration of primary human osteoblasts
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miR-126 regulates platelet-derived growth factor receptor-α expression and migration of primary human osteoblasts

  • Yvonne Schmidt , Filip Simunovic EMAIL logo , Sandra Strassburg , Dietmar Pfeifer , G. Björn Stark und Günter Finkenzeller
Veröffentlicht/Copyright: 2. September 2014

Abstract

Adequate vascularization is an essential requirement for bone development, fracture healing and bone tissue engineering. We have previously described the coculture of primary human osteoblasts (hOBs) and human endothelial cells (HUVECs), designed to investigate the interactions between these cells. In this system, we showed that cocultivation of these two cell types leads to a downregulation of platelet-derived growth factor receptor-α (PDGFR-α) in hOBs, which was a consequence of reduced mRNA stability. In the current study we investigated the possible involvement of microRNAs in this process. Firstly, we performed a microarray analysis of osteoblastic miRNAs following cocultivation with HUVECs, revealing an upregulation of miR-126. This result was confirmed by RT-qPCR, and we observed that the increase is dependent on direct cell-to-cell contacts. Gain-of-function and loss-of-function experiments showed that miR-126 is a negative regulator of PDGFR-α mRNA. Additionally, migration of hOBs was inhibited by miR-126 overexpression and stimulated by miR-126 inhibition. Addition of PDGFR-α blocking antibody to hOB culture also inhibited hOB migration. There was no effect of miR-126 modulation on osteoblast proliferation, apoptosis rate or differentiation. In conclusion, we report that the miR-126/PDGFR-α system regulates the migratory behavior of human osteoblasts, without exerting effects on cell survival and differentiation.


Corresponding author: Filip Simunovic, Department of Plastic and Hand Surgery, Freiburg University Medical Center, Hugstetterstr. 55, D-79106 Freiburg, Germany, e-mail:
aYvonne Schmidt and Filip Simunovic contributed equally to this work.

Acknowledgments

This work was supported by Deutsche Forschungsgemeinschaft (DFG), grant number: FI 790/4-1 to GF and by a research grant from the Medical School of Freiburg University (SIM916/13) to FS.

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Received: 2014-3-17
Accepted: 2014-6-26
Published Online: 2014-9-2
Published in Print: 2015-1-1

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