Abstract
Auricle reconstruction due to congenital, post-infective or post-traumatic defects represents a challenging procedure in the field of aesthetic and reconstructive surgery due to the highly complex three-dimensional anatomy of the outer ear. Tissue engineering aims to provide alternatives to overcome the shortcomings of standard surgical reconstructive procedure. In the present study, poly(vinyl alcohol)/gelatin (PVA/G) sponges at different weight ratios were produced via emulsion and freeze-drying, and crosslinked by exposure to glutaraldehyde vapors. PVA/G sponges gave rise to highly porous, water stable and hydrophilic scaffolds. Characterization of PVA/G sponges showed round-shaped interconnected pores, high swelling capacity (>200%) and viscoelastic mechanical behavior. The PVA/G 70/30 (w/w) scaffold was selected for in vitro biological studies. Bone marrow derived human mesenchymal stromal cells (hMSCs) were used and differentiated towards chondrogenic lineage under different culture conditions: 1) commercial versus handmade differentiation medium; 2) undifferentiated versus pre-differentiated hMSC seeding; and 3) static versus dynamic culture [i.e. ultrasound (US) or bioreactor stimulation]. Histological results highlighted intense glycosaminoglycan, glycoprotein and collagen syntheses after three weeks, mostly using the commercial medium, whereas round morphology was observed in pre-differentiated cells. In static culture, immunohistochemistry for chondrogenic markers revealed an early differentiation stage, characterized by the expression of Sox-9 and collagen type I fibers. The application of US on cell/scaffold constructs increased extracellular matrix deposition and resulted in 30% higher collagen type II expression at the gene level. Bioreactor culture induced collagen type II, aggrecan and elastin formation. This study demonstrated that 70/30 PVA/G sponge is a suitable candidate for auricle reconstruction.
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Acknowledgements
AURICULAE Project, funded by Stem Cells & Life Foundation, Padova, Italy is greatly acknowledged. Dr. Delfo D’Alessandro (University of Pisa, Pisa, Italy), as well as Dr. Alessandra Fusco and Dr. Giovanna Donnarumma (University of Campania “Luigi Vanvitelli”, Naples, Italy) are thanked for their fundamental technical support to this work.
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Feula, M. et al. (2020). Bioartificial Sponges for Auricular Cartilage Engineering. In: Piotto, S., Concilio, S., Sessa, L., Rossi, F. (eds) Advances in Bionanomaterials II. BIONAM 2019 2019. Lecture Notes in Bioengineering. Springer, Cham. https://doi.org/10.1007/978-3-030-47705-9_17
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