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Hierarchical polymeric scaffolds support the growth of MC3T3-E1 cells

Significance Statement

Combining design-driven macro-channels with process-driven micropores resulted in hierarchical scaffolds with a bimodal pore size distribution. The interconnected channels played a key role in cell seeding, and thereby reduced the variability in cell attachment, viability, and proliferation observed in the TIPS-only scaffolds. Larger macro-channels (~490 μm, compared to ~360 μm) showed significantly higher cell retention, whereas the smaller macro-channels supported better cell proliferation. This is consistent with curvature-driven tissue growth reported by others. It is anticipated that these macro/microporous scaffolds will enhance the transport of oxygen, nutrients, and metabolites in vivo while facilitating cell migration and angiogenesis.

Hierarchical polymeric scaffolds support the growth of MC3T3-E1 cells. Global Medical Discovery

 

Journal Reference

Rosa Akbarzadeh1, Joshua A. Minton1, Cara S. Janney1, Tyler A, Smith2, Paul F. James2, Azizeh-Mitra Yousefi1

J Mater Sci Mater Med (2015); 26:116.

Show Affiliations

1Department of Chemical, Paper and Biomedical Engineering, Miami University, 650 E High Street, Oxford, OH 45056, USA. E-mail: yousefi[email protected]

2Department of Biology, Miami University, Oxford, OH, USA.

Abstract

Tissue engineering makes use of the principles of biology and engineering to sustain 3D cell growth and promote tissue repair and/or regeneration. In this study, macro/microporous scaffold architectures have been developed using a hybrid solid freeform fabrication/thermally induced phase separation (TIPS) technique. Poly(lactic-co-glycolic acid) (PLGA) dissolved in 1,4-dioxane was used to generate a microporous matrix by the TIPS method. The 3D-bioplotting technique was used to fabricate 3D macroporous constructs made of polyethylene glycol (PEG). Embedding the PEG constructs inside the PLGA solution prior to the TIPS process and subsequent extraction of PEG following solvent removal (1,4-dioaxane) resulted in a macro/microporous structure. These hierarchical scaffolds with a bimodal pore size distribution (<50 and >300 μm) contained orthogonally interconnected macro-channels generated by the extracted PEG. The diameter of the macro-channels was varied by tuning the dispensing parameters of the 3D bioplotter. The in vitro cell culture using murine MC3T3-E1 cell line for 21 days demonstrated that these scaffolds could provide a favorable environment to support cell adhesion and growth.

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