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Modulation of Depth-dependent Properties in Tissue-engineered Cartilage with a Semi-permeable Membrane and Perfusion: A Continuum Model of Matrix Metabolism and Transport

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Abstract

The functional properties of cartilaginous tissues are determined predominantly by the content, distribution, and organization of proteoglycan and collagen in the extracellular matrix. Extracellular matrix accumulates in tissue-engineered cartilage constructs by metabolism and transport of matrix molecules, processes that are modulated by physical and chemical factors. Constructs incubated under free-swelling conditions with freely permeable or highly permeable membranes exhibit symmetric surface regions of soft tissue. The variation in tissue properties with depth from the surfaces suggests the hypothesis that the transport processes mediated by the boundary conditions govern the distribution of proteoglycan in such constructs. A continuum model (DiMicco and Sah in Transport Porus Med 50:57–73, 2003) was extended to test the effects of membrane permeability and perfusion on proteoglycan accumulation in tissue- engineered cartilage. The concentrations of soluble, bound, and degraded proteoglycan were analyzed as functions of time, space, and non-dimensional parameters for several experimental configurations. The results of the model suggest that the boundary condition at the membrane surface and the rate of perfusion, described by non-dimensional parameters, are important determinants of the pattern of proteoglycan accumulation. With perfusion, the proteoglycan profile is skewed, and decreases or increases in magnitude depending on the level of flow-based stimulation. Utilization of a semi-permeable membrane with or without unidirectional flow may lead to tissues with depth-increasing proteoglycan content, resembling native articular cartilage.

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Authors and Affiliations

  1. Department of Bioengineering, University of California, San Diego, 9500 Gilman Dr., Mail Code 0412, La Jolla, CA, 92093-0412, USA

    T. J. Klein & R. L. Sah

  2. Whitaker Institute of Biomedical Engineering, University of California, San Diego, La Jolla, CA, USA

    R. L. Sah

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  1. T. J. Klein
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  2. R. L. Sah
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Correspondence to R. L. Sah.

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Klein, T.J., Sah, R.L. Modulation of Depth-dependent Properties in Tissue-engineered Cartilage with a Semi-permeable Membrane and Perfusion: A Continuum Model of Matrix Metabolism and Transport. Biomech Model Mechanobiol 6, 21–32 (2007). https://doi.org/10.1007/s10237-006-0045-y

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  • DOI: https://doi.org/10.1007/s10237-006-0045-y

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