3D Printed Gene-activated Octacalcium Phosphate Implants for Large Bone Defects Engineering

Ilya I Bozo, Roman V. Deev, Igor V. Smirnov, Alexander Yu Fedotov, Vladimir K. Popov, Anton V. Mironov, Olga A. Mironova, Alexander Yu. Gerasimenko, Vladimir S Komlev

Article ID: 275
Vol 6, Issue 3, 2020, Pages

VIEWS - 578 (Abstract) 63 (PDF) 18 (Supp. File (Video 1))

Abstract


The aim of the study was the development of three-dimensional (3D) printed gene-activated implants based on octacalcium phosphate (OCP) and plasmid DNA encoding VEGFA. The first objective of the present work involved design and fabrication of gene-activated bone substitutes based on the OCP and plasmid DNA with VEGFА gene using 3D printing approach of ceramic constructs, providing the control of its architectonics compliance to the initial digital models. X-ray diffraction, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, and compressive strength analyses were applied to investigate the chemical composition, microstructure, and mechanical properties of the experimental samples. The biodegradation rate and the efficacy of plasmid DNA delivery in vivo were assessed during standard tests with subcutaneous implantation to rodents in the next stage. The final part of the study involved substitution of segmental tibia and mandibular defects in adult pigs with 3D printed gene-activated implants. Biodegradation, osteointegration, and effectiveness of a reparative osteogenesis were evaluated with computerized tomography, SEM, and a histological examination. The combination of gene therapy and 3D printed implants manifested the significant clinical potential for effective bone regeneration in large/critical size defect cases.


Keywords


Three-dimensional printing, Bone tissue engineering, Calcium phosphate, Octacalcium phosphate, Gene, Plasmid DNA, Vascular endothelial growth factor.

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DOI: http://dx.doi.org/10.18063/ijb.v6i3.275

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