Cited by 276Collagen: Extraction and CharacterizationHydrogels: synthesis, properties, applicationsTissue Engineering and Regenerative Medicine

Control of crosslinking for tailoring collagen-based scaffolds stability and mechanics

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Davidenko, N., Schuster, C.F., Bax, D.V., Raynal, N., Farndale, R.W., Best, S.M., Cameron, R.E.·2015·Acta Biomaterialia

Abstract

We provide evidence to show that the standard reactant concentrations used in tissue engineering to cross-link collagen-based scaffolds are up to 100 times higher than required for mechanical integrity in service, and stability against degradation in an aqueous environment. We demonstrate this with a detailed and systematic study by comparing scaffolds made from (a) collagen from two different suppliers, (b) gelatin (a partially denatured collagen) and (c) 50% collagen-50% gelatin mixtures. The materials were processed, using lyophilisation, to produce homogeneous, highly porous scaffolds with isotropic architectures and pore diameters ranging from 130 to 260 μm. Scaffolds were cross-linked using a carbodiimide treatment, to establish the effect of the variations in crosslinking conditions (down to very low concentrations) on the morphology, swelling, degradation and mechanical properties of the scaffolds. Carbodiimide concentration of 11.5mg/ml was defined as the standard (100%) and was progressively diluted down to 0.1%. It was found that 10-fold reduction in the carbodiimide content led to the significant increase (almost 4-fold) in the amount of free amine groups (primarily on collagen lysine residues) without compromising mechanics and stability in water of all resultant scaffolds. The importance of this finding is that, by reducing cross-linking, the corresponding cell-reactive carboxylate anions (collagen glutamate or aspartate residues) that are essential for integrin-mediated binding remain intact. Indeed, a 10-fold reduction in carbodiimide crosslinking resulted in near native-like cell attachment to collagen scaffolds. We have demonstrated that controlling the degree of cross-linking, and hence retaining native scaffold chemistry, offers a major step forward in the biological performance of collagen- and gelatin-based tissue engineering scaffolds. STATEMENT OF SIGNIFICANCE: This work developed collagen and gelatine-based scaffolds with structural, material and biological properties suitable for use in myocardial tissue regeneration. The novelty and significance of this research consist in elucidating the effect of the composition, origin of collagen and crosslinking concentration on the scaffold physical and cell-binding characteristics. We demonstrate that the standard carbodiimide concentrations used to crosslink collagenous scaffolds are up to 100 times higher than required for mechanical integrity in service, and stability against dissolution. The importance of this finding is that, by reducing crosslinking, the corresponding cell-reactive carboxylate anions (essential for integrin-mediated binding) remain intact and the native scaffold chemistry is retained. This offers a major step forward in the biological performance of tissue engineered scaffolds.

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Crossref · 10.1016/j.actbio.2015.07.034

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  1. [19]Barczyk M. Carracedo S. Gullberg D. Integrins Cell Tissue Res. 339 1 2010 269 280 19693543 PMC2784866
  2. [23]Gelatin Cole C. Encyclopaedia of Food Science and Technology 2000 John Wiley & Son 1183 1188
  3. [32]M.G. Haugh, The development of novel scaffolds for tissue engineering with a range of structural and mechanical properties (Ph.D. thesis), Trinity College Dublin, 2008.
  4. [51]Hamaia S.W. Farndale R.W. Integrin recognition motifs in collagens Adv. Exp. Med. Biol. 819 2014 127 142 25023172

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Authors
Davidenko, N., Schuster, C. F., Bax, D. V., Raynal, N., Farndale, R. W., Best, S. M., & Cameron, R. E.
Affiliations
University of Cambridge (GB)
Corresponding author
Davidenko, N.
Venue
Acta Biomaterialia
Publisher
Elsevier BV
Published
2015-10
Volume
25
Pages
131-142
ISSN
1742-7061 (ISSN-L)
OpenAlex
W973162690
Cited by
276
References
54
Citations by year
2026: 18 · 2025: 24 · 2024: 19 · 2023: 18 · 2022: 26 · 2021: 40 · 2020: 41 · 2019: 36 · 2018: 21 · 2017: 17 · 2016: 14 · 2015: 1
FWCI
6.39
Type
journal article
Language
en
Open access
Locations
  • Acta Biomaterialia (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Apollo (University of Cambridge) (submittedVersion, cc-by)
Funders
  • British Heart Foundation (NH/11/1/28922, RG/09/003/27122)
  • ERC Advanced (320598 3D-E)
Topics
  • Physical Sciences › Materials Science › Biomaterials › Collagen: Extraction and Characterization
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Hydrogels: synthesis, properties, applications
  • Health Sciences › Medicine › Surgery › Tissue Engineering and Regenerative Medicine
Keywords
collagen scaffolds, gelatin, crosslinking, carbodiimides, crosslink density, scaffold stability, degradation, mechanical properties, integrin binding, cell attachment, porous scaffolds, swelling, carboxylate, tissue engineering biomaterials, porosity control, freeze-drying
MeSH terms
Amines, Animals, Carbodiimides, Cattle, Cell Communication, Collagen, Cross-Linking Reagents, Humans, Microscopy, Electron, Scanning, Peptides, Rheology, Solubility, Suspensions, Viscosity, Water, Porosity, Microscopy, Confocal, Cell Line, Tumor, Tissue Scaffolds, Mechanical Phenomena

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