Differential regulation of osteoblasts by substrate microstructural features

O. Zinger, G. Zhao, Z. Schwartz, J. Simpson, M. Wieland, D. Landolt, Barbara Boyan

Research output: Contribution to journalArticlepeer-review

302 Scopus citations

Abstract

Microtextured titanium implant surfaces enhance bone formation in vivo and osteoblast phenotypic expression in vitro, but the mechanisms are not understood. To determine the roles of specific microarchitectural features in modulating osteoblast behavior, we used Ti surfaces prepared by electrochemical micromachining as substrates for MG63 osteoblast-like cell culture. Cell response was compared to tissue culture plastic, a sand-blasted with large grit and acid-etched surface with defined mixed microtopography (SLA), polished Ti surfaces, and polished surfaces electrochemically machined through a photoresist pattern to produce cavities with 100, 30 and 10 μm diameters arranged so that the ratio of the microscopic-scale area of the cavities versus the microscopic-scale area of the flat region between the cavities was equal to 1 or 6. Microstructured disks were acid-etched, producing overall sub-micron-scale roughness (Ra=0.7 μm). Cell number, differentiation (alkaline phosphatase; osteocalcin) and local factor levels (TGF-β1; PGE 2) varied with microarchitecture. 100 μm cavities favored osteoblast attachment and growth, the sub-micron-scale etch enhanced differentiation and TGF-β1 production, whereas PGE 2 depended on cavity dimensions but not the sub-micron-scale roughness.

Original languageEnglish (US)
Pages (from-to)1837-1847
Number of pages11
JournalBiomaterials
Volume26
Issue number14
DOIs
StatePublished - May 1 2005

Keywords

  • Electrochemical micromachining
  • MG63 cells
  • Microarchitecture
  • Microstructure
  • Osteoblasts
  • PGE
  • Photolithography
  • Roughness
  • Surface
  • Titanium

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials

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