The effect of ex vivo dynamic loading on the osteogenic differentiation of genetically engineered mesenchymal stem cell model

Nadav Kimelman-Bleich, Dror Seliktar, Ilan Kallai, Gregory A. Helm, Zulma Gazit, Dan Gazit, Gadi Pelled*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Mechanical loading has been described as a highly important stimulus for improvements in the quality and strength of bone. It has also been shown that mechanical stimuli can induce the differentiation of mesenchymal stem cells (MSCs) along the osteogenic lineage. We have previously demonstrated the potent osteogenic effect of MSCs engineered to overexpress the BMP2 gene. In this study we investigated the effect of mechanical loading on BMP2-expressing MSC-like cells, using a special bioreactor designed to apply dynamic forces on cell-seeded hydrogels. Cell viability, alkaline phosphatase (ALP) activity, BMP2 secretion and mineralized substance formation in the hydrogels were quantified. We found that cell metabolism increased as high as 6.8-fold, ALP activity by 12.5-fold, BMP2 secretion by 182-fold and mineralized tissue formation by 1.72-fold in hydrogels containing MSC-like cells expressing BMP2, which were cultured in the presence of mechanical loading. We have shown that ex vivo mechanical loading had an additive effect on BMP2-induced osteogenesis in genetically engineered MSC-like cells. These data could be valuable for bone tissue-engineering strategies of the future.

Original languageEnglish
Pages (from-to)384-393
Number of pages10
JournalJournal of Tissue Engineering and Regenerative Medicine
Volume5
Issue number5
DOIs
StatePublished - May 2011

Keywords

  • Bioreactors
  • Bone
  • Mechanical effects on cells and tissues
  • Mesenchymal stem cells

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