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    Modeling Stem/Progenitor Cell-Induced Neovascularization and Oxygenation Around Solid Implants

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    Type
    Article
    Authors
    Jain, Harsh Vardhan
    Moldovan, Nicanor I.
    Byrne, Helen M. cc
    KAUST Grant Number
    KUK-C1-013-04
    Date
    2012-07
    Permanent link to this record
    http://hdl.handle.net/10754/598861
    
    Metadata
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    Abstract
    Tissue engineering constructs and other solid implants with biomedical applications, such as drug delivery devices or bioartificial organs, need oxygen (O(2)) to function properly. To understand better the vascular integration of such devices, we recently developed a novel model sensor containing O(2)-sensitive crystals, consisting of a polymeric capsule limited by a nanoporous filter. The sensor was implanted in mice with hydrogel alone (control) or hydrogel embedded with mouse CD117/c-kit+ bone marrow progenitor cells in order to stimulate peri-implant neovascularization. The sensor provided local partial O(2) pressure (pO(2)) using noninvasive electron paramagnetic resonance signal measurements. A consistently higher level of peri-implant oxygenation was observed in the cell-treatment case than in the control over a 10-week period. To provide a mechanistic explanation of these experimental observations, we present in this article a mathematical model, formulated as a system of coupled partial differential equations, that simulates peri-implant vascularization. In the control case, vascularization is considered to be the result of a foreign body reaction, while in the cell-treatment case, adipogenesis in response to paracrine stimuli produced by the stem cells is assumed to induce neovascularization. The model is validated by fitting numerical predictions of local pO(2) to measurements from the implanted sensor. The model is then used to investigate further the potential for using stem cell treatment to enhance the vascular integration of biomedical implants. We thus demonstrate how mathematical modeling combined with experimentation can be used to infer how vasculature develops around biomedical implants in control and stem cell-treated cases.
    Citation
    Jain HV, Moldovan NI, Byrne HM (2012) Modeling Stem/Progenitor Cell-Induced Neovascularization and Oxygenation Around Solid Implants. Tissue Engineering Part C: Methods 18: 487–495. Available: http://dx.doi.org/10.1089/ten.tec.2011.0452.
    Sponsors
    The authors thank Drs. Markus Owen and Holger Perfahl for many helpful discussions. This work was made possible in part by a U.S. partnering award from the Biotechnology and Biological Sciences Research Council (Grant BB/G530484/1), which facilitates collaboration between the University of Nottingham and the Mathematical Biosciences Institute. H.V.J. acknowledges support from the MBI and the National Science Foundation (Grant 0635561). N.I.M. was supported by National Institutes of Health Grants R01 HL065983 and R01 HL096524. This publication is based on work supported in part by Award No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Mary Ann Liebert Inc
    Journal
    Tissue Engineering Part C: Methods
    DOI
    10.1089/ten.tec.2011.0452
    PubMed ID
    22224628
    PubMed Central ID
    PMC3400277
    ae974a485f413a2113503eed53cd6c53
    10.1089/ten.tec.2011.0452
    Scopus Count
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