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Tracking Hypoxic Signaling within Encapsulated Cell Aggregates
Published on: December 16, 2011
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High oxygen preservation hydrogels to augment cell survival under hypoxic condition
1Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA; Department of Mechanical Engineering and Materials Science, Washington University in St. Louis, St. Louis, MO 63130, USA.
Acta Biomaterialia
|January 19, 2020
Summary
New hydrogels improve stem cell survival for tissue regeneration. These advanced cell carriers preserve oxygen and quickly solidify, enhancing cell retention and therapeutic efficacy in ischemic tissues.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Polymer Chemistry
Background:
- Cell therapy shows promise for ischemic tissue regeneration but faces challenges.
- High cell death under low oxygen and poor cell retention limit therapeutic outcomes.
- Novel cell carriers are needed to enhance cell survival and tissue integration.
Purpose of the Study:
- To develop and characterize novel hydrogels for enhanced cell survival and retention in ischemic tissues.
- To create a cell carrier with high oxygen preservation and rapid gelation properties.
- To evaluate the efficacy of these hydrogels in supporting encapsulated stem cell viability and proliferation.
Main Methods:
- Synthesis of N-isopropylacrylamide (NIPAAm) based copolymers using reversible addition-fragmentation chain transfer (RAFT) polymerization.
- Incorporation of acrylate-oligolactide (AOLA), 2-hydroxyethyl methacrylate (HEMA), and methacrylate-poly(ethylene glycol)-perfluorooctane (MAPEGPFC).
- Assessment of hydrogel properties including sol-gel transition, gelation time, degradation, oxygen retention, and biocompatibility with encapsulated bone marrow mesenchymal stem cells (MSCs).
Main Results:
- Hydrogels exhibited tunable sol-gel temperatures around room temperature, injectable at 4°C, and rapid gelation (≤6s) at 37°C.
- Hydrogels demonstrated high oxygen partial pressure retention under low oxygen conditions compared to controls.
- Encapsulated MSCs showed significantly improved survival and proliferation under 1% O2 in the developed hydrogels versus control hydrogels.
- Hydrogels exhibited excellent biocompatibility and minimal inflammation upon implantation.
Conclusions:
- Developed NIPAAm-based hydrogels effectively preserve oxygen and rapidly gel, addressing key limitations in cell therapy for ischemic tissues.
- These hydrogels significantly enhance the survival and proliferation of encapsulated stem cells under hypoxic conditions.
- The findings indicate these hydrogels are promising cell carriers for transplantation into ischemic tissues, improving therapeutic potential.
