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Variability observed in mechano-regulated in vivo tissue differentiation can be explained by variation in cell mechano-sensitivity
Publikationstyp
Journal Article
Date Issued
2011-04-07
Sprache
English
Author(s)
Journal
Volume
44
Issue
6
Start Page
1051
End Page
1058
Citation
Journal of Biomechanics 44 (6): 1051-1058 (2011)
Publisher DOI
Scopus ID
Publisher
Elsevier
Computational simulations of tissue differentiation have been able to capture the main aspects of tissue formation/regeneration observed in animal experiments-except for the considerable degree of variability reported. Understanding and modelling the source of this variability is crucial if computational tools are to be developed for clinical applications. The objective of this study was to test the hypothesis that differences in cell mechano-sensitivity between individuals can explain the variability of tissue differentiation patterns observed experimentally. Simulations of an experiment of tissue differentiation in a mechanically loaded bone chamber were performed. Finite element analysis was used to determine the biophysical environment, and a lattice-modelling approach was used to simulate cell activity. Differences in cell mechano-sensitivity among individuals were modelled as differences in cell activity rates, with the activation of cell activities regulated by the mechanical environment. Predictions of the tissue distribution in the chambers produced the two different classes of results found experimentally: (i) chambers with a layer of bone across the chamber covered by a layer of cartilage on top and (ii) chambers with almost no bone, mainly fibrous tissue and small islands of cartilage. This indicates that the differing cellular response to the mechanical environment (i.e., subject-specific mechano-sensitivity) could be a reason for the different outcomes found when implants (or tissue engineered constructs) are used in a population. © 2011.
Subjects
FE-model
Inter-specimen variability
Lattice model
Mechanobiology
Mechano-regulation
DDC Class
610: Medicine, Health