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Preclinical biological and physicochemical evaluation of two-photon engineered 3D biomimetic copolymer scaffolds for bone healing

Kampleitner, Carina; Changi, Katayoon; Felfel, Reda M.; Scotchford, Colin A.; Sottile, Virginie; Kluger, Rainer; Hoffmann, Oskar; Grant, David M.; Epstein, Michelle M.

Authors

Carina Kampleitner

Katayoon Changi

Virginie Sottile

Rainer Kluger

Oskar Hoffmann

DAVID GRANT david.grant@nottingham.ac.uk
Professor of Materials Science

Michelle M. Epstein



Abstract

A major challenge in orthopedics is the repair of large non-union bone fractures. A promising therapy for this indication is the use of biodegradable bioinspired biomaterials that stabilize the fracture site, relieve pain and initiate bone formation and healing. This study uses a multidisciplinary evaluation strategy to assess immunogenicity, allergenicity, bone responses and physicochemical properties of a novel biomaterial scaffold. Two-photon stereolithography generated personalized custom-built scaffolds with a repeating 3D structure of Schwarz Primitive minimal surface unit cell with a specific pore size of ∼400 μm from three different methacrylated poly(D,L-lactide-co-ε-caprolactone) copolymers with lactide to caprolactone monomer ratios of 16 : 4, 18 : 2 and 9 : 1. Using in vitro and in vivo assays for bone responses, immunological reactions and degradation dynamics, we found that copolymer composition influenced the scaffold physicochemical and biological properties. The scaffolds with the fastest degradation rate correlated with adverse cellular effects and mechanical stiffness correlated with in vitro osteoblast mineralization. The physicochemical properties also correlated with in vivo bone healing and immune responses. Overall these observations provide compelling support for these scaffolds for bone repair and illustrate the effectiveness of a promising multidisciplinary strategy with great potential for the preclinical evaluation of biomaterials.

Citation

Kampleitner, C., Changi, K., Felfel, R. M., Scotchford, C. A., Sottile, V., Kluger, R., …Epstein, M. M. (2020). Preclinical biological and physicochemical evaluation of two-photon engineered 3D biomimetic copolymer scaffolds for bone healing. Biomaterials Science, 8(6), 1683-1694 . https://doi.org/10.1039/c9bm01827a

Journal Article Type Article
Acceptance Date Jan 17, 2020
Online Publication Date Jan 27, 2020
Publication Date Jan 27, 2020
Deposit Date Jan 29, 2020
Publicly Available Date Jan 28, 2021
Journal Biomaterials Science
Electronic ISSN 2047-4849
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 8
Issue 6
Pages 1683-1694
DOI https://doi.org/10.1039/c9bm01827a
Keywords General Materials Science; Biomedical Engineering
Public URL https://nottingham-repository.worktribe.com/output/3813737
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2020/BM/C9BM01827A
Additional Information : This document is Similarity Check deposited; : Virginie Sottile (ORCID); : Michelle M. Epstein (ORCID); : Single-blind; : Received 12 November 2019; Accepted 17 January 2020; Advance Article published 27 January 2020

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