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. 2020 Feb 21;25(4):978. doi: 10.3390/molecules25040978

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) HA/collagen IPN developed to mimic fibrillarity and viscoelasticity of the ECM. (i) Scheme of formation viscoelastic HA single network hydrogel via dynamic covalent hydrazone crosslinking and chemical structures of modified HA; (ii) representation of composition and network structure of ECM, dynamic HA-collagen IPN and conventional statically crosslinked hydrogel. (iii) MSC spreading is more pronounced in these dynamic IPN hydrogels with higher stress relaxation in comparison with more conventional hydrogels that have very low stress relaxation. [91]. (B) (i) Chemical structure of gelatin/tyramine (G/T) derivative and gelatin/tyramine/HEP (G/T/H) hydrogels; (ii) crosslinking mechanism by HRP and H₂O₂ addition to form injectable G/T/H hydrogels and (iii) comparison of new blood vessel formation of G/T and G/T/H hydrogels using an in vivo chicken chorioallantoic membrane (CAM) assay and after 5 days of incubation [103]. (Reproduced with permission from [91,103]).