Abstract
Perfusion bioreactors are widely used in tissue engineering and pharmaceutical research to provide reliable models of tissue growth under controlled conditions. Destructive assays are not able to follow the evolution of the growing tissue on the same construct, so it is necessary to adopt non-destructive analysis. We have developed a miniaturized, optically accessible bioreactor for interstitial perfusion of 3D cell-seeded scaffolds. The scaffold adopted was optically transparent, with highly defined architecture. Computational fluid dynamics (CFD) analysis was useful to predict the flow behavior in the bioreactor scaffold chamber (that was laminar flow, Re = 0.179, with mean velocity equal to 100 microns/s). Moreover, experimental characterization of the bioreactor performance gave that the maximum allowable pressure was 0.06 MPa and allowable flow rate up to 25 ml/min. A method, to estimate quantitatively and non destructively the cell proliferation (from 15 to 43 thousand cells) and tissue growth (from 2% to 43%) during culture time, was introduced and validated. An end point viability test was performed to check the experimental set-up overall suitability for cell culture with successful results. Morphological analysis was performed at the end time point to show the complex tridimensional pattern of the biological tissue growth. Our system, characterized by controlled conditions in a wide range of allowable flow rate and pressure, permits to systematically study the influence of several parameters on engineered tissue growth, using viable staining and a standard fluorescence microscope.
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Acknowledgements
Funding grants: 5 per Mille Junior CUP D41J10000490001 (Politecnico di Milano) project “Computational models for heterogeneous media. Application to Microscale analysis of tissue-engineered constructs”; IIT (Genoa) project “Biosensors and Artificial Bio-systems”; Cariplo 2010 project “3D Microstructuring and Functionalization of Polymeric Materials for Scaffolds in Regenerative Medicine”.
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Laganà, M., Raimondi, M.T. A miniaturized, optically accessible bioreactor for systematic 3D tissue engineering research. Biomed Microdevices 14, 225–234 (2012). https://doi.org/10.1007/s10544-011-9600-0
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DOI: https://doi.org/10.1007/s10544-011-9600-0