Electrospun titania fiber mats spin coated with thin polymer films as nanofibrous scaffolds for enhanced cell proliferation.
Alfin KurniawanChintya EffendiMeng-Jiy WangPublished in: Journal of tissue engineering and regenerative medicine (2017)
The incorporation of inorganic materials into electrospun nanofibres has recently gained considerable attention for the development of extracellular matrix-like scaffolds with improved mechanical properties and enhanced biological functions for tissue engineering applications. In this study, polymer-inorganic composite fibres consisting of poly(2-ethyl-2-oxazoline) (PEOXA) and tetrabutyl titanate as the titanium precursor were successfully fabricated through a combined sol-gel/electrospinning approach. PEOXA/Ti(OR)n composite fibres were obtained with varying amounts of polymer and titanium precursors. Calcinations of the composite fibres were performed at varying temperatures to produce TiO2 fibres (TiO2 -T-60) with anatase, anatase/rutile mixed phase, and rutile crystal structures. Thin polymer films (i.e., poly(2-ethyl-2-oxazoline) (PEOXA), polycaprolactone (PCL), and poly(methyl methacrylate) (PMMA)) were subsequently deposited onto TiO2 -T-60 fibre mats by spin coating to facilitate handling of the electrospun substrates after calcination, which are rather brittle and disintegrate easily, and to probe cell-materials interactions. The cellular behaviour of mouse L929 fibroblasts after culture periods of 1-5 days was compared on the following fibre scaffolds: PEOXA/Ti(OR)n , TiO2 -T-60 (T = 600, 650, and 700 °C), TiO2 -T-60 spin-coated with thin PCL film (PCL/TiO2 -T-60), and pure PCL. The results obtained from in vitro cell culture studies for the lactate dehydrogenase release assay and confocal microscopic visualization pointed out the synergistic interplay between the TiO2 crystal structure and spin-coated PCL film in facilitating cell interactions with the scaffold surface. The L929 cells were observed to adhere and proliferate better on the surface of TiO2 -700-60 having the rutile structure than on the surfaces of TiO2 -600-60 and TiO2 -650-60 fibre scaffolds with anatase and anatase/rutile mixed phase structures, respectively.
Keyphrases
- tissue engineering
- quantum dots
- visible light
- room temperature
- extracellular matrix
- cell proliferation
- crystal structure
- stem cells
- density functional theory
- oxidative stress
- ionic liquid
- high throughput
- cell cycle
- cell therapy
- staphylococcus aureus
- molecular dynamics
- bone marrow
- mass spectrometry
- drug delivery
- living cells
- optical coherence tomography
- candida albicans
- reduced graphene oxide