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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants
Published on: December 23, 2013
An improved cryosection method for polyethylene glycol hydrogels used in tissue engineering.
Jia-Ling Ruan1, Nathaniel L Tulloch, Veronica Muskheli
1Department of Bioengineering, University of Washington, Seattle, Washington 98109, USA.
Tissue Engineering. Part C, Methods
|March 2, 2013
Summary
Histological preparation of hydrogels is challenging due to their high water content. This study introduces a cryosectioning method using cryoprotectants like polyvinyl alcohol (PVA) and optimum cutting temperature (OCT) compound to preserve tissue architecture.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Histology
Background:
- Hydrogels closely mimic biological extracellular conditions due to high water content.
- Standard histological preparations like paraffin-embedding and cryosectioning are problematic for hydrogels, causing deformation or ice crystal damage.
Purpose of the Study:
- To develop an effective cryosectioning method for hydrogel-based bioengineered tissues.
- To evaluate various cryoprotective agents for improving hydrogel histological preparation.
Main Methods:
- Polyethylene glycol (PEG) hydrogels were used as a model system.
- Conventional sucrose solutions were replaced with protein-based (bovine serum albumin, fetal bovine serum) and nonprotein-based (polyvinyl alcohol, optimum cutting temperature compound, Fisher HistoPrep) cryoprotectants.
- Hydrogels were incubated overnight in cryoprotective solutions before cryosectioning.
Main Results:
- Nonprotein-based solutions, specifically polyvinyl alcohol (PVA) and optimum cutting temperature (OCT) compound, effectively improved hydrogel cryosectioning.
- PVA and OCT reduced background staining in hematoxylin and eosin staining by 50% compared to protein-based solutions.
- The developed method preserved tissue architecture and cellular details in both in vitro and in vivo implanted hydrogel constructs.
Conclusions:
- A simple and effective cryosectioning technique for hydrogels was established.
- This method enhances the histological evaluation of hydrogel-based tissue-engineered constructs.
- The technique is applicable to various hydrogel applications, improving tissue preservation and analysis.
