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Simple Establishment of a Vascularized Osteogenic Bone Marrow Niche Using Pre-Cast Poly(ethylene Glycol) (PEG) Hydrogels in an Imaging Microplate
Published on: May 19, 2023
Cyclic acetal hydrogel system for bone marrow stromal cell encapsulation and osteodifferentiation
Martha W Betz1, Parth C Modi, John F Caccamese
1Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, USA.
Journal of Biomedical Materials Research. Part A
|November 21, 2007
Summary
This study introduces a new cyclic acetal-based hydrogel (EH-PEG) for encapsulating bone marrow stromal cells (BMSCs). The EH-PEG hydrogel and its initiator system support BMSC viability and osteodifferentiation, offering a promising biomaterial for cell encapsulation.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Biology
Background:
- Hydrogels are widely used for encapsulating bone marrow stromal cells (BMSCs) for regenerative medicine applications.
- Existing hydrogels may have limitations due to degradation byproducts affecting local pH.
- Cyclic acetal-based hydrogels offer a potential alternative due to neutral degradation products.
Purpose of the Study:
- To evaluate a novel cyclic acetal-based hydrogel (EH-PEG) for BMSC encapsulation.
- To assess the impact of the EH-PEG hydrogel components and fabrication process on BMSC viability, metabolic activity, and osteodifferentiation.
- To determine the suitability of EH-PEG hydrogels for supporting BMSC osteogenic differentiation.
Main Methods:
- Fabrication of EH-PEG hydrogels using 5-ethyl-5-(hydroxymethyl)-beta,beta-dimethyl-1,3-dioxane-2-ethanol diacrylate (EHD) and poly(ethylene glycol) diacrylate (PEGDA).
- Assessment of BMSC viability and metabolic activity following exposure to the ammonium persulfate (APS) and N,N,N',N'-tetramethylethylenediamine (TEMED) initiator system.
- Evaluation of osteodifferentiation markers (alkaline phosphatase, osteocalcin) after simulated encapsulation.
- Assessment of encapsulated BMSC viability after 7 days of culture within EH-PEG hydrogels.
Main Results:
- The APS-TEMED initiator system minimally affected BMSC metabolic activity and viability at tested concentrations.
- Osteodifferentiation potential of BMSCs was not significantly impacted by short-term exposure to the initiator system.
- Encapsulated BMSCs maintained high viability within EH-PEG hydrogels for up to 7 days.
- EH-PEG hydrogels demonstrated suitability for BMSC encapsulation and supported osteodifferentiation.
Conclusions:
- The novel EH-PEG hydrogel is biocompatible and supports BMSC viability and osteodifferentiation.
- The initiator system used for EH-PEG hydrogel fabrication has minimal adverse effects on BMSCs.
- EH-PEG hydrogels represent a promising biomaterial for BMSC encapsulation in regenerative medicine applications.
