title: Biomimetic niche for neural stem cell differentiation using poly-L-lysine/hyaluronic acid multilayer films.
abstract: Polyelectrolyte multilayer films have been suggested as tunable substrates with flexible surface properties that can modulate cell behavior. However, these films' biological effects on neural stem/progenitor cells have rarely been studied. Herein, biomimetic multilayer films composed of hyaluronic acid and poly-L-lysine were chosen to mimic the native extracellular matrix niche of brain tissue and were evaluated for their inductive effects, without the addition of chemical factors. Because neural stem/progenitor cells are sensitive to substrate properties, it is important that this system provides control over the surface charge, and slight stiffness variations are also possible. Both of these factors affect neural stem/progenitor cell differentiation. The results showed that neural stem/progenitor cells were induced to differentiate on the poly-L-lysine/hyaluronic acid multilayer films with 0.5-4 alternating layers. In addition, the neurite outgrowth length was regulated by the surface charge of the terminal layer but did not increase with the layer number. In contrast, the quantity of differentiated neurons was enhanced slightly as the number of layers increased but was not affected by the surface charge of the terminal layer. In sum, material pairs in the form of native poly-L-lysine/hyaluronic acid films achieved important targets for neural regenerative medicine, including enhancement of the neurite outgrowth length, regulation of neuron differentiation, and the formation of a network. These extracellular matrix-mimetic poly-L-lysine/hyaluronic acid multilayer films may provide a versatile platform that could be useful for surface modification for applications in neural engineering.
authors.affiliation: Graduate Institute of Biochemical and Biomedical Engineering, Chang-Gung University, Taiwan, R.O.C. iclee@mail.cgu.edu.tw.
authors.forename: I-Chi
authors.initials: IC
authors.lastname: Lee
authors.affiliation: Graduate Institute of Biochemical and Biomedical Engineering, Chang-Gung University, Taiwan, R.O.C.
authors.forename: Yu-Chieh
authors.initials: YC
authors.lastname: Wu
authors.affiliation: Department of Biomedical Sciences, Chang-Gung University, Tao-yuan 333, Taiwan, R.O.C.
authors.forename: En-Ming
authors.initials: EM
authors.lastname: Cheng
authors.affiliation: Graduate Institute of Biochemical and Biomedical Engineering, Chang-Gung University, Taiwan, R.O.C.
authors.forename: Wen-Ting
authors.initials: WT
authors.lastname: Yang
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry*; D002454:Cell Differentiation; D002478:Cells, Cultured; D006820:Hyaluronic Acid / Q000737:chemistry; D008422:Materials Testing; D058953:Neural Stem Cells / Q000166:cytology* / Q000378:metabolism; D016501:Neurites / Q000648:ultrastructure; D011107:Polylysine / Q000737:chemistry; D051381:Rats; D013499:Surface Properties; D016704:Synapsins / Q000378:metabolism
chemical_list: D001672:Biocompatible Materials; D016704:Synapsins; D011107:Polylysine; D006820:Hyaluronic Acid
keywords: Neural stem/progenitor cells; differentiation; hyaluronic acid; neurite outgrowth length; poly-L-lysine