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文獻名： Stem cell attachment to layer-by-layer assembled TiO2 nanoparticle thin films

 

作者： Dinesh S. Kommireddya, Shashikanth M. Sriramb, Yuri M. Lvova, c, David K. Millsa, b

a Institute for Micromanufacturing, Louisiana Tech University, 911 Hergot Avenue, Ruston, LA 71272, USA

b School of Biological Sciences, Louisiana Tech University, 1 West Arizona, Ruston, LA 71272, USA

c Department of Chemistry, Louisiana Tech University, 1 West Arizona, Ruston, LA 71272, USA

 

摘要： Surface topography is one of the most important factors influencing the attachment and spreading of cells. In the present study, layer-by-layer assembled titanium dioxide (TiO2) nanoparticle thin films were chosen for attachment, proliferation and spreading studies on mouse mesenchymal stem cells (MSC). Increasing surface roughness was observed with increasing number of layer-by-layer assembled TiO2 thin films. Four layer TiO2 thin film showed higher number of attached cells than a one layer thin film and control surfaces. MSCs experienced no cytotoxic effects after culture on the TiO2 coated substrates as observed from the cytotoxicity tests. Cell spreading, visualized with scanning electron microscopy, showed a faster rate of spreading on a rougher surface. Cells on a four-layer substrate, at 12 h showed complete spreading, where as most of the cells on a control surface and a one-layer surface, at 24 h, retained a rounded morphology. In conclusion, TiO2 nanoparticle thin films were successfully assembled in alternation with polyelectrolytes and in-vitro studies with MSC showed an increase in the attachment and faster spreading of cells on rougher surfaces.

 

關鍵詞： Layer-by-layer assembly; Stem cells; Nanoparticles; Surface roughness; Surface modification; Titanium dioxide