title: Control of cultured human cells with femtosecond laser ablated patterns on steel and plastic surfaces.
abstract: The purpose of the present study is to explore topographical patterns produced with femtosecond laser pulses as a means of controlling the behaviour of living human cells (U2OS) on stainless steel surfaces and on negative plastic imprints (polycarbonate). The results show that the patterns on both types of material strongly affect cell behaviour and are particularly powerful in controlling cell spreading/elongation, localization and orientation. Analysis by fluorescence and scanning electron microscopy shows that on periodic 1D grating structures, cells and cell nuclei are highly elongated and aligned, whereas on periodic 2D grid structures, cell spreading and shape is affected. The results also show that the density and morphology of the cells can be affected. This was observed particularly on pseudo-periodic, coral-like structures which clearly inhibited cell growth. The results suggest that these patterns could be used in a variety of applications among the fields of clinical research and implant design, as well as in diagnosis and in cell and drug research. Furthermore, this article highlights the noteworthy aspects and the unique strengths of the technique and proposes directions for further research.
authors.affiliation: Department of Biology, University of Eastern Finland, PO Box 111, FI-80101, Joensuu, Finland. tarmo.nuutinen@uef.fi
authors.forename: Tarmo
authors.initials: T
authors.lastname: Nuutinen
authors.forename: Martti
authors.initials: M
authors.lastname: Silvennoinen
authors.forename: Kimmo
authors.initials: K
authors.lastname: Päiväsaari
authors.forename: Pasi
authors.initials: P
authors.lastname: Vahimaa
mesh_terms: D002452:Cell Count; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002469:Cell Separation / Q000379:methods*; D048429:Cell Size; D002478:Cells, Cultured; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D054802:Molecular Imprinting / Q000379:methods*; D012516:Osteosarcoma / Q000473:pathology* / Q000503:physiopathology*; D011076:Polycarboxylate Cement / Q000737:chemistry* / Q000528:radiation effects; D013193:Stainless Steel / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties
chemical_list: D011076:Polycarboxylate Cement; D013193:Stainless Steel; C005506:polycarbonate