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Screening biomaterials with a new in vitro method for potential calcification: Porcine aortic valves and bovine pericardium

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Abstract

Calcification is still a major cause of failure of implantable biomaterials. A fast and reliable in vitro model could contribute to the study of its mechanisms and to testing different anticalcification techniques. In this work, we attempted to investigate the potential calcification of biomaterials using an in vitro model. We purposed to test the ability of this model to screening possible anticalcification efficacy of different biomaterials. Porcine heart valve (PAV) and bovine pericardial (BP) tissues, fixed with glutaraldehyde were immersed into biological mimicking solution, where the pH and the initial concentrations of calcium and phosphoric ions were kept stable by the addition of precipitated ions during calcification. Kinetics of calcification was continuously monitored. The evaluation of biomaterials was carried out by comparing the kinetic rates of formation of calcific deposits. After 24 h, the calcific deposits on PAVs were found to be developed at significant higher rates (ranged from 0.81×10−4–2.18×10−4 mol/min m2) than on BP (0.19×10−4–0.52×10−4 mol/min m2) (one-way ANOVA, p<0.05) depending on the experimental conditions (supersaturation of the solution). Parallel tests for similar biomaterials implanted subcutaneously in animal (rat) model showed after 49 days that significant higher amounts of total minerals deposited on PAV (236.73±139.12, 9 animals mg minerals/g dry net tissue) (mean±standard deviation) compared with that formed on BP (104.36±79.21, #9 mg minerals/g dry net tissue) (ANOVA, p<0.05). There is evidence that in vitro calcification was correlated well with that of animal model and clinical data.

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Authors and Affiliations

  1. Biomedical Engineering Laboratory, Department of Mechanical Engineering and Aeronautics, University of Patras, GR 26500, Patras, Greece

    D. Mavrilas

  2. FORTH/ICE-HT and Department of Chemical Engineering, University of Patras, GR 26500, Patras, Greece

    J. Kapolos & P. G. Koutsoukos

  3. Division of Cardiothoracic Surgery, Department of Medicine, University of Patras, GR 26500, Patras, Greece

    D. Dougenis

Authors
  1. D. Mavrilas
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  2. J. Kapolos
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  3. P. G. Koutsoukos
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  4. D. Dougenis
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Correspondence to D. Mavrilas.

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Mavrilas, D., Kapolos, J., Koutsoukos, P.G. et al. Screening biomaterials with a new in vitro method for potential calcification: Porcine aortic valves and bovine pericardium. Journal of Materials Science: Materials in Medicine 15, 699–704 (2004). https://doi.org/10.1023/B:JMSM.0000030212.55320.c2

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  • DOI: https://doi.org/10.1023/B:JMSM.0000030212.55320.c2

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