Dynamic Hyaluronan Hydrogels with Temporally Modulated High Injectability and Stability Using a Biocompatible Catalyst.
Junzhe LouFang LiuChristopher D LindsayOvijit ChaudhuriSarah C HeilshornYan XiaPublished in: Advanced materials (Deerfield Beach, Fla.) (2018)
Injectable and biocompatible hydrogels have become increasingly important for cell transplantation to provide mechanical protection of cells during injection and a stable scaffold for cell adhesion post-injection. Injectable hydrogels need to be easily pushed through a syringe needle and quickly recover to a gel state, thus generally requiring noncovalent or dynamic cross-linking. However, a dilemma exists in the design of dynamic hydrogels: hydrogels with fast exchange of cross-links are easier to eject using less force, but lack long-term stability; in contrast, slow exchange of cross-links improves stability, but compromises injectability and thus the ability to protect cells under flow. A new concept to resolve this dilemma using a biocompatible catalyst to modulate the dynamic properties of hydrogels at different time points of application to have both high injectability and high stability is presented. Hyaluronic acid based hydrogels are formed through dynamic covalent hydrazone cross-linking in the presence of a biocompatible benzimidazole-based catalyst. The catalyst accelerates the formation and exchange of hydrazone bonds, enhancing injectability, but rapidly diffuses away from the hydrogel after injection to retard the exchange and improve the long-term stability for cell culture.
Keyphrases
- hyaluronic acid
- ionic liquid
- drug release
- tissue engineering
- induced apoptosis
- room temperature
- drug delivery
- ultrasound guided
- highly efficient
- reduced graphene oxide
- cell cycle arrest
- cell adhesion
- carbon dioxide
- magnetic resonance
- stem cells
- single cell
- magnetic resonance imaging
- cell therapy
- gold nanoparticles
- computed tomography
- oxidative stress
- extracellular matrix
- endoplasmic reticulum stress
- signaling pathway
- single molecule
- cell death
- molecular dynamics simulations