title: The gene-expression and phenotypic response of hFOB 1.19 osteoblasts to surface-modified titanium and zirconia.
abstract: The osteoblastic cell-line hFOB 1.19 with the potential to proliferate and differentiate revealed that cellular differentiation is not affected by material and roughness on newly developed zirconia implant materials. Materials under investigation were surfaces machined titanium (Ti-m), modified titanium (TiUnite, machined zirconia (TZP-A-m), modified zirconia (ZiUnitemachined alumina-toughened zirconia (ATZ-m) and modified alumina-toughened zirconia (ATZ-mod). After surface description by scanning electron microscopy (SEM) and atomic force microscopy (AFM), cellular proliferation (EZ4U, Casy1) and differentiation were examined after days 1, 3, 7, 14, 21, and 28. Osteogenic differentiation was visualized by alkaline phosphatase staining, mineralization assay (alizarin red) and by expression analysis (RT-PCR) of bone- and extracellular matrix-related genes. Proliferation on rough surfaces was reduced on both titanium and zirconia. Cell-attachment and cytoskeleton organization documented by confocal laser scanning microscopy (CLSM) elucidated attenuated cell attachment within the first 4h to be the reason for impaired proliferation. A specific up-regulation of m-RNAs in an early event (RUNX2, NELL-1, RUNX3, and BMP7) and a late event (Integrin B3) could be observed on TiUnite and ZiUnite. For titanium an up-regulation of IBSP and Integrin B1 could be described at day 21. In total, differentiation was neither affected by material nor by roughness.
authors.affiliation: Department of Prosthodontics, Albert-Ludwigs-University, Hugstetter Str. 55, 79106 Freiburg, Germany. bernhard.setzer@uniklinik-freiburg.de
authors.forename: Bernhard
authors.initials: B
authors.lastname: Setzer
authors.forename: Maria
authors.initials: M
authors.lastname: Bächle
authors.forename: Marc C
authors.initials: MC
authors.lastname: Metzger
authors.forename: Ralf J
authors.initials: RJ
authors.lastname: Kohal
mesh_terms: D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects; D019070:Cell Lineage / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D003599:Cytoskeleton / Q000187:drug effects / Q000378:metabolism; D022001:Focal Adhesions / Q000187:drug effects / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects*; D006801:Humans; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D010641:Phenotype; D019736:Prostheses and Implants; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013499:Surface Properties / Q000187:drug effects; D013997:Time Factors; D014025:Titanium / Q000494:pharmacology*; D015040:Zirconium / Q000494:pharmacology*
chemical_list: D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide