title: NGF release from thermo-responsive collagen-polyNIPAam polymer networks supports neuronal cell growth and differentiation.
abstract: The combination of thermo-sensitive polymer and natural macromolecules such as collagen type I can produce biomimetic scaffolds with enhanced properties for clinical translation. This study describes the preparation of semi-Interpenetrated Networks (semi-IPNs) of crosslinked poly(N-isopropylacrylamide), or PNIPAam, with collagen type I. The collagen-PNIPAam networks with varying collagen content were characterized using Fourier transform infrared spectroscopy techniques and their thermal responsiveness was evaluated by swelling experiments, differential scanning calorimetric (DSC) analysis. Rheological studies were performed at constant frequency and oscillating stress. PNIPAam and semi-IPNs were preloaded with nerve growth factor (NGF), and the NGF releasing profiles at different temperatures were studied using Enzyme-Linked ImmunoSorbent Assay (ELISA). The growth and differentiation of PC12 cells on NGF PNIPAam and collagen-PNIPAam scaffolds were investigated in this study. Neurite length and neurite number of differentiated PC12 cells increased with the increase in collagen content in the scaffolds.
authors.affiliation: National Centre for Biomedical Engineering Science (NCBES), National University of Ireland, Galway, Ireland.
authors.forename: Susanne
authors.initials: S
authors.lastname: Doleski
authors.forename: Li
authors.initials: L
authors.lastname: Yao
authors.forename: Abhay
authors.initials: A
authors.lastname: Pandit
authors.forename: Carlos
authors.initials: C
authors.lastname: Elvira
mesh_terms: D000178:Acrylamides / Q000737:chemistry / Q000378:metabolism*; D000180:Acrylic Resins; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry / Q000378:metabolism; D018929:Cell Culture Techniques; D002454:Cell Differentiation / Q000502:physiology*; D049109:Cell Proliferation; D003094:Collagen / Q000737:chemistry / Q000378:metabolism*; D008422:Materials Testing; D020932:Nerve Growth Factor / Q000378:metabolism*; D016716:PC12 Cells; D011108:Polymers / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D001672:Biocompatible Materials; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D003094:Collagen; D020932:Nerve Growth Factor