title: Amine functionalization of cholecyst-derived extracellular matrix with generation 1 PAMAM dendrimer.
abstract: A method to functionalize cholecyst-derived extracellular matrix (CEM) with free amine groups was established in an attempt to improve its potential for tethering of bioactive molecules. CEM was incorporated with Generation-1 polyamidoamine (G1 PAMAM) dendrimer by using N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide and N-hydroxysuccinimide cross-linking system. The nature of incorporation of PAMAM dendrimer was evaluated using shrink temperature measurements, Fourier transform infrared (FTIR) assessment, ninhydrin assay, and swellability. The effects of PAMAM incorporation on mechanical and degradation properties of CEM were evaluated using a uniaxial mechanical test and collagenase degradation assay, respectively. Ninhydrin assay and FTIR assessment confirmed the presence of increasing free amine groups with increasing quantity of PAMAM in dendrimer-incorporated CEM (DENCEM) scaffolds. The amount of dendrimer used was found to be critical in controlling scaffold degradation, shrink temperature, and free amine content. Cell culture studies showed that fibroblasts seeded on DENCEM maintained their metabolic activity and ability to proliferate in vitro. In addition, fluorescence cell staining and scanning electron microscopy analysis of cell-seeded DENCEM showed preservation of normal fibroblast morphology and phenotype.
authors.affiliation: National Centre for Biomedical Engineering Science, National University of Ireland, Galway, Republic of Ireland.
authors.forename: Jeffrey C Y
authors.initials: JC
authors.lastname: Chan
authors.forename: Krishna
authors.initials: K
authors.lastname: Burugapalli
authors.forename: Hemantkumar
authors.initials: H
authors.lastname: Naik
authors.forename: John L
authors.initials: JL
authors.lastname: Kelly
authors.forename: Abhay
authors.initials: A
authors.lastname: Pandit
mesh_terms: D016475:3T3 Cells; D000588:Amines / Q000737:chemistry* / Q000494:pharmacology; D000818:Animals; D050091:Dendrimers; D005109:Extracellular Matrix / Q000187:drug effects / Q000502:physiology*; D005704:Gallbladder / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D051379:Mice; D011073:Polyamines / Q000737:chemistry* / Q000494:pharmacology; D013552:Swine
chemical_list: D000588:Amines; D050091:Dendrimers; C104700:PAMAM Starburst; D011073:Polyamines