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Stable oxime-crosslinked hyaluronan-based hydrogel as a biomimetic vitreous substitute
Alexander E G Baker1, Hong Cui2, Brian G Ballios3
1Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College St, Toronto, ON, M5S 3E5, Canada; Institute of Biomedical Engineering, University of Toronto, 160 College St, Toronto, ON, M5S 3E1, Canada.
Biomaterials
|March 16, 2021
Summary
A new hyaluronan-oxime hydrogel offers a safer and more effective vitreous substitute. This innovative material mimics natural vitreous, avoiding complications associated with current gas and oil treatments for retinal detachment.
Area of Science:
- Ophthalmology
- Biomaterials Science
- Regenerative Medicine
Background:
- Current vitreous substitutes like gases and oils present significant clinical challenges, including restrictive post-operative positioning and the need for secondary surgeries.
- Developing an ideal vitreous substitute that mimics native vitreous properties and ensures retinal health is a critical unmet need in ophthalmology.
Purpose of the Study:
- To engineer and evaluate a novel hyaluronan-oxime crosslinked hydrogel as a potential vitreous substitute.
- To assess the physical properties, biocompatibility, stability, and functional impact of the hydrogel on retinal integrity and function.
Main Methods:
- Chemical modification of naturally abundant hyaluronan with poly(ethylene glycol)-tetraoxyamine via oxime chemistry.
- In vitro cytocompatibility testing with mouse retinal photoreceptors and in vivo biocompatibility assessment in rabbit eyes.
- Evaluation of ocular pressure, hydrogel stability and degradation, and retinal function using electroretinography.
Main Results:
- The engineered hydrogel exhibited physical properties similar to native vitreous, including refractive index, density, and transparency.
- In vitro and in vivo studies demonstrated excellent cytocompatibility and biocompatibility, with no significant impact on ocular pressure or retinal histology.
- Electroretinography confirmed preserved retinal function over 90 days, and the hydrogel showed controlled degradation in vivo.
Conclusions:
- The novel hyaluronan-oxime hydrogel represents a promising advancement over existing vitreous substitutes.
- Its favorable biocompatibility, functional preservation, and degradation profile suggest significant potential for clinical application in retinal surgeries.
