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Osteogenic potential of bone marrow stromal cells on smooth, roughened, and tricalcium phosphate-modified titanium alloy surfaces

Colombo, J. S., Carley, Albert Frederick, Fleming, G. J., Crean, S. J., Sloan, Alastair James and Waddington, Rachel Jane 2012. Osteogenic potential of bone marrow stromal cells on smooth, roughened, and tricalcium phosphate-modified titanium alloy surfaces. Internation Journal of Oral and Maxillofacial Implants 27 (5) , pp. 1029-1042.

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PURPOSE: This study investigated the influence of smooth, roughened, and tricalcium phosphate (TCP)-coated roughened titanium-aluminum-vanadium (Ti-6Al-4V) surfaces on the osteogenic potential of rat bone marrow stromal cells (BMSCs). METHODS: Machined smooth (MS), grit-blasted roughened (MT), and roughened surfaces coated with TCP were prepared from Ti-6Al-4V. Plastic surfaces were used as a control. Surface topography and chemical characteristics were determined. Cell attachment, morphology, proliferation, and temporal expression of mRNA and protein markers associated with bone healing were examined. RESULTS: Roughness values were 0.09 ± 0.02 Μm, 2.71 ± 0.24 Μm, and 6.08 ± 0.62 Μm for MS, MT, and TCP, respectively. Cell attachment was similar on all surfaces. The cell expansion phase occurred during days 1 to 3 on MS surfaces and days 3 to 5 on MT and TCP surfaces. The earlier onset of differentiation on MS surfaces versus MT and TCP surfaces was evidenced by: high mRNA expression peak for Runx2 at day 5 on MS (day 7 on MT and TCP); higher mRNA expression for osteopontin, osteonectin, bone sialoprotein (BSP), osteocalcin, type 1 collagen, and alkaline phosphatase over days 5 to 12 on MS compared with MT and TCP; higher levels of bone matrix proteins on MS compared with MT, with only BSP detected on TCP; cell morphology consistent with descriptions of differentiating osteoblasts apparent at day 5 on MS and absent on MT. Compared to plastic surfaces, Ti-6Al-4V appeared to suppress mRNA for interleukin 1Β, tumor necrosis factor alpha, and peroxisome proliferator-activated receptor gamma expression and upregulate osteoprotegerin. ConCLUSIONS: Cell expansion was delayed on roughened Ti-6Al-4V surfaces, impeding osteoblast differentiation and bone matrix synthesis. These results disagree with a number of published studies examining pure titanium. Ti-6Al-4V surfaces appear to assist in the resolution of proinflammatory cytokines and inhibit BMSC differentiation toward adipocytes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Subjects: Q Science > QD Chemistry
R Medicine > RK Dentistry
Uncontrolled Keywords: tcp; ti-6al-4v; roughen; surface; bmsc; bone; bsp; titanium; osteogenic; tricalcium; alloy; marrow stromal; stromal cell; cell; osteogenic potential;
Last Modified: 12 Sep 2019 20:59

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