title: A tunable hydrogel for encapsulation and controlled release of bioactive proteins.
abstract: A N,N-dimethylacrylamide-based hydrogel (2) with the new cross-linker (ethylenedioxy) bis[2,2'-(N-acryloylamino)ethane] (1) has been prepared, and its physicochemical properties in aqueous solution were studied. Three different native proteins (lysozyme, bovine serum albumin, and rabbit IgG) were encapsulated within the polymeric matrix 2, and the kinetics of their release from the swollen hydrogel were determined. The rate of protein release exhibits a clear dependence on both the molecular weight of the protein and the amount of cross-linker utilized to prepare the hydrogel. This is reflected by the fact that the low molecular weight proteins are released at an increased rate versus higher molecular weight proteins. In addition a greater amount of protein is released from the hydrogels with a lower percentage of cross-linker. The polymerization procedure used in this study is sufficiently mild to safeguard the functional integrity of attendant biomolecules as determined by the retention of catalytic activity of encapsulated alpha-chymotrypsin and aldolase catalytic antibody 38C2. The potential utility of these hydrogels for the controlled release of bioactive agents in vivo is strengthened by both their lack of toxicity against human dermal fibroblasts and their lack of immunogenicity in mice.
authors.affiliation: Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
authors.forename: Mercedes
authors.initials: M
authors.lastname: Delgado
authors.forename: Carsten
authors.initials: C
authors.lastname: Spanka
authors.forename: Lisa D
authors.initials: LD
authors.lastname: Kerwin
authors.forename: Paul
authors.initials: P
authors.lastname: Wentworth
authors.forename: Kim D
authors.initials: KD
authors.lastname: Janda
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D002918:Chymotrypsin; D003124:Colorimetry; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D004339:Drug Compounding; D005453:Fluorescence; D020100:Hydrogels / Q000737:chemistry; D015394:Molecular Structure; D009113:Muramidase; D011108:Polymers; D011506:Proteins / Q000737:chemistry*; D012710:Serum Albumin, Bovine; D013696:Temperature
chemical_list: D000178:Acrylamides; D003432:Cross-Linking Reagents; D003692:Delayed-Action Preparations; D020100:Hydrogels; D011108:Polymers; D011506:Proteins; D012710:Serum Albumin, Bovine; C099046:N,N-dimethylacrylamide; D009113:Muramidase; D002918:Chymotrypsin; C117608:alpha-chymotrypsin