Bone Morphogenetic Protein-2 Signaling in the Osteogenic Differentiation of Human Bone Marrow Mesenchymal Stem Cells Induced by Pulsed Electromagnetic Fields.

Author: Martini F1, Pellati A2, Mazzoni E1, Salati S3, Caruso G4, Contartese D1,5, De Mattei M1
Author Information:
1Department of Medical Sciences, University of Ferrara, 44121 Ferrara, Italy.
2Department of Morphology, Surgery and Experimental Medicine, University of Ferrara, 44121 Ferrara, Italy.
3IGEA Clinical Biophysics, Carpi, 41012 Modena, Italy.
4Department of Biomedical and Specialty Surgical Sciences, Azienda Ospedaliero-Universitaria di Ferrara-Arcispedale Sant'Anna, University of Ferrara, 44124 Ferrara, Italy.
5Laboratory Preclinical and Surgical Studies, IRCCS Istituto Ortopedico Rizzoli, 40136 Bologna, Italy.
Conference/Journal: Int J Mol Sci.
Date published: 2020 Mar 19
Other: Volume ID: 21 , Issue ID: 6 , Special Notes: doi: 10.3390/ijms21062104. , Word Count: 210


Pulsed electromagnetic fields (PEMFs) are clinically used with beneficial effects in the treatment of bone fracture healing. This is due to PEMF ability to favor the osteogenic differentiation of mesenchymal stem cells (MSCs). Previous studies suggest that PEMFs enhance the osteogenic activity of bone morphogenetic protein-2 (BMP2) which is used in various therapeutic interventions. This study investigated the molecular events associated to the synergistic activity of PEMFs and BMP2 on osteogenic differentiation. To this aim, human MSCs (hMSCs) were exposed to PEMFs (75 Hz, 1.5 mT) in combination with BMP2, upon detection of the minimal dose able to induce differentiation. Changes in the expression of BMP signaling pathway genes including receptors and ligands, as well as in the phosphorylation of BMP downstream signaling proteins, such as SMAD1/5/8 and MAPK, were analyzed. Results showed the synergistic activity of PEMFs and BMP2 on osteogenic differentiation transcription factors and markers. The PEMF effects were associated to the increase in BMP2, BMP6, and BMP type I receptor gene expression, as well as SMAD1/5/8 and p38 MAPK activation. These results increase knowledge concerning the molecular events involved in PEMF stimulation showing that PEMFs favor hMSCs osteogenic differentiation by the modulation of BMP signaling components.

KEYWORDS: BMP; mesenchymal stem cells; osteogenic differentiation; pulsed electromagnetic fields

PMID: 32204349 DOI: 10.3390/ijms21062104

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