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Injectable porcine bone demineralized and digested extracellular matrix—PEGDA hydrogel blend for bone regeneration

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Abstract

Extracellular matrix (ECM) has a major role in the structural support and cellular processes of organs and tissues. Proteins extracted from the ECM have been used to fabricate different scaffolds for tissue engineering applications. The aims of the present study were to extract, characterize and fabricate a new class of hydrogel with proteins isolated from pig bone ECM and combine them with a synthetic polymer so it could be used to promote bone regeneration. Porcine bone demineralized and digested extracellular matrix (pddECM) containing collagen type I was produced, optimized and sterilized with high pressurized CO2 method. The pddECM was further blended with 20% w/v polyethylene glycol diacrylate (PEGDA) to create an injectable semi interpenetrating polymer network (SIPN) scaffold with enhanced physicochemical properties. The blend tackled the shortfall of natural polymers, such as lack of structural stability and fast degradation, preserving its structure in more than 90% after 30 days of incubation; thus, increasing the material endurance in a simulated physiological environment. The manufactured injectable hydrogel showed high cytocompatibility with hOb and SaOs-2 cells, promoting osteogenic proliferation within 21 days of culture. The hydrogel had a high compression modulus of 520 kPa, low swelling (5.3 mg/mg) and millimetric volume expansion (19.5%), all of which are favorable characteristics for bone regeneration applications.

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Acknowledgements

The authors would like to acknowledge the support from, The University of Sydney Scool of Dentistry and Chemical and Biomolecular Engineering, The University of Sydney, Mass Spectrometry Facility Core and Scanning Electron Microscopy facility, Sydney, NSW, Australia, Australian Dental Research Foundation (ADRF) 40-2015 CONICYT PAI/INDUSTRIA 79090016, 3M ESPE, and the technical support of Elizabeth Kelly, Filip Vujovic and Mara Cvejic.

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Correspondence to Fabian Obregon-Miano.

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Obregon-Miano, F., Fathi, A., Rathsam, C. et al. Injectable porcine bone demineralized and digested extracellular matrix—PEGDA hydrogel blend for bone regeneration. J Mater Sci: Mater Med 31, 21 (2020). https://doi.org/10.1007/s10856-019-6354-3

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