Abstract
In this work a coupled model of solute transport and uptake, cell proliferation, extracellular matrix synthesis and remodeling of mechanical properties accounting for the impact of mechanical loading is presented as an advancement of a previously validated coupled model for free-swelling tissue-engineered cartilage cultures. Tissue-engineering constructs were modeled as biphasic with a linear elastic solid, and relevant intrinsic mechanical stimuli in the constructs were determined by numerical simulation for use as inputs of the coupled model. The mechanical dependent formulations were derived from a calibration and parametrization dataset and validated by comparison of normalized ratios of cell counts, total glycosaminoglycans and collagen after 24-h continuous cyclic unconfined compression from another dataset. The model successfully fit the calibration dataset and predicted the results from the validation dataset with good agreement, with average relative errors up to 3.1 and 4.3 %, respectively. Temporal and spatial patterns determined for other model outputs were consistent with reported studies. The results suggest that the model describes the interaction between the simultaneous factors involved in in vitro tissue-engineered cartilage culture under dynamic loading. This approach could also be attractive for optimization of culture protocols, namely through the application to longer culture times and other types of mechanical stimuli.
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Acknowledgments
This work is supported by FCT Fundação para a Ciência e Tecnologia with the reference Project PTDC/EMS-TEC/3263/2014 and by Programa Operacional Competitividade e Internacionalização through the Project POCI-01-0145-FEDER-016574.
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Bandeiras, C., Completo, A. A mathematical model of tissue-engineered cartilage development under cyclic compressive loading. Biomech Model Mechanobiol 16, 651–666 (2017). https://doi.org/10.1007/s10237-016-0843-9
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DOI: https://doi.org/10.1007/s10237-016-0843-9