Biomaterials Research (생체재료학회지)

Korean Society for Biomaterials (한국생체재료학회)
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Investigation of the changes of biophysical/mechanical characteristics of differentiating preosteoblasts in vitro

  • Subbiah, Ramesh (Center for Biomaterials, Korea Institute of Science and Technology (KIST)) ;
  • Suhaeri, Muhammad (Center for Biomaterials, Korea Institute of Science and Technology (KIST)) ;
  • Hwang, Mintai Peter (Center for Biomaterials, Korea Institute of Science and Technology (KIST)) ;
  • Kim, Woojun (Center for Biomaterials, Korea Institute of Science and Technology (KIST)) ;
  • Park, Kwideok (Center for Biomaterials, Korea Institute of Science and Technology (KIST))
  • Received : 2015.09.02
  • Accepted : 2015.11.01
  • Published : 2015.12.31
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Abstract

Background: Topography, stiffness, and composition of biomaterials play a crucial role in cell behaviors. In this study, we have investigated biochemical (gene markers), biophysical (roughness), and biomechanical (stiffness) changes during the osteogenic differentiation of preosteoblasts on gelatin matrices. Results: Our results demonstrate that gelatin matrices offer a favorable microenvironment for preosteoblasts as determined by focal adhesion and filopodia formation. The osteogenic differentiation potential of preosteoblasts on gelatin matrices is confirmed by qualitative (Alizarin red, von kossa staining, immunofluorescence, and gene expression) and quantitative analyses (alkaline phosphatase activity and calcium content). The biomechanical and biophysical properties of differentiating preosteoblasts are analyzed using atomic force microscopy (AFM) and micro indentation. The results show sequential and significant increases in preosteoblasts roughness and stiffness during osteogenic differentiation, both of which are directly proportional to the progress of osteogenesis. Cell proliferation, height, and spreading area seem to have no direct correlation with differentiation; however, they may be indirectly related to osteogenesis. Conclusions: The increased stiffness and roughness is attributed to the mineralized bone matrix and enhanced osteogenic extracellular matrix protein. This report indicates that biophysical and biomechanical aspects during in vitro cellular/extracellular changes can be used as biomarkers for the analysis of cell differentiation.

Keywords

Acknowledgement

Supported by : Korea Institute of Science and Technology (KIST)

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