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Biochem Biophys Res Commun. 2014 Sep 12;452(1):118-23. doi: 10.1016/j.bbrc.2014.08.055. Epub 2014 Aug 21.

Mesenchymal stem cells from osteoporotic patients reveal reduced migration and invasion upon stimulation with BMP-2 or BMP-7.

Author information

  • 1Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: florian.haasters@med.uni-muenchen.de.
  • 2Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: denitsa.docheva@med.uni-muenchen.de.
  • 3Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: gassner.cj@gmail.com.
  • 4Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: tzvetan.popov@med.uni-muenchen.de.
  • 5Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: wboecker@me.com.
  • 6Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: wolf.mutschler@med.uni-muenchen.de.
  • 7Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: matthias.schieker@med.uni-muenchen.de.
  • 8Experimental Surgery and Regenerative Medicine, Department of Hand-, Plastic- and Trauma Surgery, Ludwig-Maximilians-University (LMU), Nussbaumstr. 20, D-80336 Munich, Germany. Electronic address: christian.prall@med.uni-muenchen.de.

Abstract

Fractures to the osteoporotic bone feature a delay in callus formation and reduced enchondral ossification. Human mesenchymal stem cells (hMSC), the cellular source of fracture healing, are recruited to the fracture site by cytokines, such as BMP-2 and BMP-7. Aim of the study was to scrutinize hMSC for osteoporosis associated alterations in BMP mediated migration and invasion as well as in extracellular matrix (ECM) binding integrin expression. HMSC were isolated from 18 healthy or osteoporotic donors. Migration was assessed using a collagen IV coated micro-slide linear gradient chamber and time-lapse microscopy. Invasion was analyzed utilizing an ECM coated transmembrane invasion assay. Quantitative real-time RT PCR was performed for the ECM binding integrins α1, α2, α3, α4, α5, α11, αv and β1. HMSC from osteoporotic patients showed a significant increase of migration upon BMP-2 or FCS stimulation, as well as a significant increase of invasion upon BMP-2, BMP-7 or FCS stimulation. Nevertheless, the migration and invasion capacity was significantly decreased compared to healthy controls. Out of all integrins analyzed, collagen binding integrin α2 was significantly downregulated in hMSC from osteoporotic patients. In conclusion, we here demonstrate for the first time osteoporosis associated alterations in BMP mediated hMSC recruitment. These findings may underlie the reduced healing of osteoporotic fractures. Nevertheless, the maintained migration and invasion response upon BMP stimulation illustrates the therapeutic potential of these clinically approved substances in the treatment of osteoporotic fractures. Another therapeutic target may be the downregulation of the collagen binding integrin α2 in hMSC from osteoporotic patients.

Copyright © 2014 The Authors. Published by Elsevier Inc. All rights reserved.

KEYWORDS:

Integrin expression; Invasion; Mesenchymal stem cells (MSC); Migration

PMID:
25152406
[PubMed - indexed for MEDLINE]
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