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• W2031146748 abstract "The objective of this study was to determine the effect of porous bioactive glass (45S5) substrate characteristics on the expression and maintenance of the osteoblastic phenotype. We cultured ROS 17/2.8 cells on substrates with different pore size and porosity for periods up to 14 days and analyzed the characteristics of the cells and extracellular matrix. Results of the study show that the glass substrates supported the proliferation and growth of osteoblast-like cells. Although the morphologies of the cells differed on the various substrates, their shape and the extent of membrane ruffling suggested that they maintained high levels of metabolic activity. Cells on all substrates expressed high levels of alkaline phosphatase activity and produced extracellular matrices that mineralized to form nonstoichiometric, carbonated, calcium-deficient apatites. An important finding was that at a given porosity of 44 %, the pore size neither directed nor modulated the in vitro expression of the osteoblastic phenotype. In contrast, porosity did affect cellular function. We noted that at an average pore size of 92 μm, as the porosity increased from 35 to 59 %, osteoblast activity was reduced. As designed in this experiment, an increase in the porosity led to a corresponding increase in total surface area of the specimens. With increasing porosity and surface area, glass reactions in the media may persist for longer durations at higher intensities, thereby affecting local media composition. As such, we suggest that extensive conditioning treatments before cell seeding can reduce this effect. Our results also revealed that the expression of the osteoblastic phenotype is enhanced by the ongoing glass dissolution. The reaction pathway at the origin of this effect still needs to be elucidated. Taken together, the findings support the overall hypothesis that in vitro cell activity can be controlled by a careful selection of substrate properties. © 2000 John Wiley & Sons, Inc. J Biomed Mater Res, 52, 783–796, 2000." @default.
• W2031146748 created "2016-06-24" @default.
• W2031146748 creator A5019521528 @default.
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• W2031146748 date "2000-01-01" @default.
• W2031146748 modified "2023-10-03" @default.
• W2031146748 title "Effect of varying physical properties of porous, surface modified bioactive glass 45S5 on osteoblast proliferation and maturation" @default.
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• W2031146748 doi "https://doi.org/10.1002/1097-4636(20001215)52:4<783::aid-jbm24>3.0.co;2-j" @default.
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