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Fabrication of positively charged poly(ethylene glycol)-diacrylate hydrogel as a bone tissue engineering scaffold
- Source :
- Biomedical Materials. 7:055009
- Publication Year :
- 2012
- Publisher :
- IOP Publishing, 2012.
-
Abstract
- To improve cell attachment and to understand the effects of positive charge on the behavior of osteoblasts, 2-(methacryloyloxy)ethyl-trimethylammonium chloride (MAETAC), a positively charged monomer, was incorporated into poly(ethylene glycol)-diacrylate (PEGDA) hydrogel. The physicochemical properties of the resultant polymers, including the degree of acrylation of PEGDA, pKa of MAETAC, swelling ratio, zeta potential, and protein adsorption were investigated. Meanwhile, osteoblast-like MC3T3-E1 cells were seeded on the hydrogel to evaluate the effect of the positive charge on the behavior of the cells, including attachment, proliferation, and differentiation. The results revealed that PEGDA was synthesized with 90 percent of acrylation and MAETAC had been successfully incorporated into PEGDA. The pKa value of MAETAC was 9.4 determined by acid-based titration. The electrically charged nature of modified hydrogels was confirmed by zeta potential. With increasing concentration of MAETAC, the swelling ratio of the hydrogel in deionized water increased, while the swelling ratio stayed constant in phosphate buffer solution. The protein adsorption of the hydrogel also increased with increasing concentration of MAETAC. The modification of positive charge not only enhanced the attachment and proliferation of osteoblast-like MC3T3-E1 cells on the hydrogel, but also up-regulated alkaline phosphatase activity in the cells as well as gene expression of focal adhesion kinase and osteogenic markers, including collagen I, osteopontin, and osteocalcin. These findings indicate that the positively charged PEGDA may not only be a promising scaffold candidate for bone tissue engineering, but also a good platform to study the effect of positive charge on cell behavior due to the controllable charge density.
- Subjects :
- Materials science
Biomedical Engineering
Gene Expression
Bioengineering
Polyethylene Glycols
Biomaterials
Mice
chemistry.chemical_compound
Tissue engineering
Osteogenesis
Materials Testing
Polymer chemistry
Cell Adhesion
Electrochemistry
Zeta potential
Animals
Cell Proliferation
chemistry.chemical_classification
Osteoblasts
Tissue Engineering
Tissue Scaffolds
Hydrogels
3T3 Cells
Polymer
Alkaline Phosphatase
Monomer
chemistry
Focal Adhesion Kinase 1
Bone Substitutes
Self-healing hydrogels
Biophysics
Methacrylates
Alkaline phosphatase
Ethylene glycol
Protein adsorption
Subjects
Details
- ISSN :
- 1748605X and 17486041
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Biomedical Materials
- Accession number :
- edsair.doi.dedup.....1edb40a445e9716982e2d972005eba83