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DOI: 10.1055/s-0044-1784940
Biocompatibility and coating potential of functionalized calciumphosphate nanoparticles on CI electrodes
Introduction Nanoparticles can serve as carrier substances for drugs, proteins and even nucleic acids. They penetrate the membrane of a target cell so that their conjugates can create intracellular effects. Also DNA, coding for a growth factor or anti-inflammatory factors,, can be transfected using the nanoparticles without any further reagents. However, there has been little research to date on whether this approach could play a role in the modeling of cochlear implant electrodes.
Materials and Methods DNA-functionalized (with fluorescent dye and the growth factor BDNF) calciumphosphate-nanoparticles (CaP-NP) were applied to a cell culture dish bottom by a layer-by-layer process in combination with the adhesion molecule poly-(L)-lysine. Spiral ganglion cell explants from rats were then cultured on these surfaces, and marked and evaluated immunohistochemically after a minimum of 3 days of growing. Furthermore, an electrophoretic method for coating cochlear implant electrodes with nanoparticles was investigated by scanning electron microscopy.
Results Using the layer-by-layer process, relatively large amounts of CaP-NP can be bound to the surface. However, the evaluation of the cell cultures shows limited biocompatibility of the nanoparticles with the spiral ganglion explants over a longer culture period. If the Ca-NP are added as a supplement to the growth medium, better survival of the cells was shown as well as a low but stable transfection of DNA into the cells.
Discussion The present results show that surfaces can be successfully coated with DNA-conjugated CaP-NP. The CaP-NP have limited biocompatibility with the inner ear cells in vitro, but show detectable DNA transfection.
Funding information DFG: HA 7395/3-1
Publication History
Article published online:
19 April 2024
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