Abstract
The present work is focused on the design of a bioactive chitosan-based scaffold functionalized with organic and inorganic signals to provide the biochemical cues for promoting stem cell osteogenic commitment. The first approach is based on the use of a sequence of 20 amino acids corresponding to a 68–87 sequence in knuckle epitope of BMP-2 that was coupled covalently to the carboxyl group of chitosan scaffold. Meanwhile, the second approach is based on the biomimetic treatment, which allows the formation of hydroxyapatite nuclei on the scaffold surface. Both scaffolds bioactivated with organic and inorganic signals induce higher expression of an early marker of osteogenic differentiation (ALP) than the neat scaffolds after 3 days of cell culture. However, scaffolds decorated with BMP-mimicking peptide show higher values of ALP than the biomineralized one. Nevertheless, the biomineralized scaffolds showed better cellular behaviour than neat scaffolds, demonstrating the good effect of hydroxyapatite deposits on hMSC osteogenic differentiation. At long incubation time no significant difference among the biomineralized and BMP-activated scaffolds was observed. Furthermore, the highest level of Osteocalcin expression (OCN) was observed for scaffold with BMP2 mimic-peptide at day 21. The overall results showed that the presence of bioactive signals on the scaffold surface allows an osteoinductive effect on hMSC in a basal medium, making the modified chitosan scaffolds a promising candidate for bone tissue regeneration.
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Acknowledgements
This study has received funding from the PNR-CNR Aging Program 2012–2018. The authors also thank Mrs. Cristina Del Barone for facilitating microscopy analysis, Mrs Stefania Zeppetelli for supporting of biological investigations and Dr. Luca D’Andrea for HPLC and mass spectrometry investigations at Institute of Biostructure and Bioimaging (IBB) in Naples, Italy.
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These authors contributed equally: Alessandra Soriente and Ines Fasolino.
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Soriente, A., Fasolino, I., Raucci, M.G. et al. Effect of inorganic and organic bioactive signals decoration on the biological performance of chitosan scaffolds for bone tissue engineering. J Mater Sci: Mater Med 29, 62 (2018). https://doi.org/10.1007/s10856-018-6072-2
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DOI: https://doi.org/10.1007/s10856-018-6072-2