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Smart Design of Stable Extracellular Matrix Mimetic Hydrogel: Synthesis, Characterization, and In Vitro and In Vivo Evaluation for Tissue Engineering
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Polymer Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Polymer Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Polymer Chemistry.
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2013 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 23, no 10, 1273-1280 p.Article in journal (Refereed) Published
Abstract [en]

The simplicity and versatility of hydrazone crosslinking has made it a strategy of choice for the conjugation of bioactive molecules. However, the labile nature of hydrazone linkages and reversibility of this coupling reaction restricts its full potential. Based on the fundamental understanding of hydrazone stability, this problem is circumvented by resonance-stabilization of a developing N2 positive charge in a hydrazone bond. A novel chemistry is presented to develop a resilient hydrazone bond that is stable and non- reversible under physiological conditions. A carbodihydrazide (CDH) type hydrazide derivative of the biomolecule forms intrinsically stabilized hydrazone-linkages that are nearly 15-fold more stable at pH 5 than conventional hydrazone. This chemoselective coupling reaction is catalyst-free, instantaneous, and virtually non-cleavable under physiological conditions, therefore can serve as a catalyst-free alternative to click chemistry. This novel crosslinking reaction is used to tailor a hyaluronan hydrogel, which delivered exceptional hydrolytic stability, mechanical properties, low swelling, and controlled enzymatic degradation. These desired characteristics are achieved without increasing the chemical crosslinking. The in vivo evaluation of this hydrogel revealed neo-bone with highly ordered collagen matrix mimicking natural bone regeneration. The proximity ligation assay or PLA is used to detect blood vessels, which highlighted the quality of engineered tissue.

Place, publisher, year, edition, pages
2013. Vol. 23, no 10, 1273-1280 p.
Keyword [en]
biomimetics, biomedical applications, hydrogels, tissue engineering, hyaluronic acid
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-198387DOI: 10.1002/adfm.201201698ISI: 000316196100007OAI: oai:DiVA.org:uu-198387DiVA: diva2:616179
Available from: 2013-04-15 Created: 2013-04-15 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Insights into dynamic covalent chemistry for bioconjugation applications
Open this publication in new window or tab >>Insights into dynamic covalent chemistry for bioconjugation applications
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dynamic covalent chemistry (DCC) is currently exploited in several areas of biomedical applications such as in drug discovery, sensing, molecular separation, catalysis etc. Hydrazone and oxime chemistry have several advantages, such as mild reaction conditions, selectivity, efficiency, and biocompatibility and therefore, have the potential to be for bioconjugation applications. However, these reactions suffer from major drawbacks of slow reaction rate and poor bond stability under physiological conditions. In this regard, the work presented in this thesis focuses on designing novel bioconjugation reactions amenable under physiological conditions with tunable reaction kinetics and conjugation stability.

The first part of the thesis presents different strategies of dynamic covalent reactions utilized for biomedical applications. In the next part, a detailed study related to the mechanism and catalysis of oxime chemistry was investigated in the presence of various catalysts. Aniline, carboxylate and saline were selective as target catalysts and their reaction kinetics were compared under physiological conditions (Paper I and II). Then we attempted to explore the potential of those chemistries in fabricating 3D hydrogel scaffolds for regenerative medicine application. A novel mild and regioselective method was devised to introduce an aldehyde moiety onto glycosaminoglycans structure. This involved the introduction of amino glycerol to glycosaminoglycans, followed by regioselective oxidation of tailed flexible diol without affecting the C2-C3 diol groups on the disaccharide repeating unit. The oxidation rate of the tailed flexible diol was 4-times faster than that of C2-C3 diol groups of native glycosaminoglycan. This strategy preserves the structural integrity of the glycosaminoglycans and provides a functional aldehyde moiety (Paper III). Further, different types of hydrazones were designed and their hydrolytic stability under acidic condition was carefully evaluated. The hydrazone linkage with the highest hydrolytic stability was utilized in the preparation of extracellular matrix hydrogel for delivery of bone morphogenetic proteins 2 in bone regeneration (Paper IV) and studied for controlled release of the growth factor (Paper III).

In summary, this thesis presents a selection of strategies for designing bioconjugation chemistries that possess tunable stability and reaction kinetics under physiological conditions. These chemistries are powerful tools for conjugation of biomolecules for the biomedical applications.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. 59 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1554
Keyword
dynamic covalent chemistry, reaction mechanism, hydrogel, bioconjugation, catalysis
National Category
Polymer Chemistry Materials Chemistry Organic Chemistry
Research subject
Chemistry with specialization in Polymer Chemistry
Identifiers
urn:nbn:se:uu:diva-329022 (URN)978-91-513-0065-8 (ISBN)
Public defence
2017-10-26, Room 10132, Ånströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
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Available from: 2017-10-03 Created: 2017-09-06 Last updated: 2017-10-18

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Oommen, Oommen P.Wang, ShujiangKisiel, MartaHilborn, JönsVarghese, Oommen P.

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