Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
Volume 75A, Issue 2, Pages 295-307Publisher
WILEY
DOI: 10.1002/jbm.a.30419
Keywords
poloxamine-methacrylate hydrogels; quaternary ammonium groups; cell attachment; HepG2 cells; endothelial cells
Funding
- NIBIB NIH HHS [EB001013] Funding Source: Medline
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Four-arm poly(ethylene oxide) and poly(propylene oxide) (PEO-PPO) block copolymer (poloxamine, Tetronic 1107((TM))) hydrogels were modified with positively charged groups with the aim of overcoming the low cell adhesion properties of these PEO-rich systems. Different matrices containing poloxamine-methacrylate (6-12%) and a quaternary ammonium methacrylate ([2-(methacryloyloxy)ethyl]-trimethylammonium chloride [MAETAC], 0-0.48M) were produced by a photo-initiated free radical copolymerization. A sharp increase in water content for MAETAC-containing gels was seen during the first 2 days of incubation in distilled water; some of the gels showed water uptakes as high as 12 times the initial wet weight. In phosphate-buffered saline (PBS), this effect was less pronounced because of the decrease in the osmotic gradient. In addition, a gradual increase of both the storage and the loss modulus of the gels resulted from increasing the MAETAC content [e.g., G' values increased from 13,500 Pa for 12% poloxamine-methacrylate gels without MAETAC to 151,000 Pa for 0.48M MAETAC contents (at 1 Hz, 100 Pa of oscillatory stress)]. Although on pure poloxamine-methacrylate gels HepG2 and HUVEC cells attached poorly, on MAETAC-containing specimens a well-spread morphology and confluent monolayers were obtained, at least after preincubation in serum containing medium. Although not having all the cell compatibility of collagen, these fully synthetic quaternary ammonium-modified PEO-rich gels may have some utility in tissue-engineering applications where stiff gels and cell attachment after gelation are desired. (c) 2005 Wiley Periodicals, Inc.
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