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- W2165932353 abstract "Abstract Osteoblasts exhibit enhanced differentiation and altered gene profiles when cultured on hydroxyapatite (HA) compared to plastic surfaces. To begin determining mechanisms for this response, we used proteomics to identify proteins predominantly found in osteoblasts on HA but not plastic surfaces. Two‐dimensional gel electrophoresis and Western analyses indicate that fetuin is abundant in extracts from HA, but not plastic surfaces. Incubation of HA and plastic surfaces with cell culture medium (containing 10% serum) under cell‐free conditions shows that fetuin is predominantly derived from the culture medium serum and readily adsorbs to the HA surface. However, we did detect low levels of fetuin B mRNA in osteoblasts. Serum albumin, actin‐β, apolipoprotein‐AI, and vimentin also adsorbed to HA. To determine the role of fetuin in the HA‐induced osteoblast phenotype changes, osteoblasts were seeded onto fetuin‐coated or uncoated HA under serum‐free conditions. Osteoblast morphology was similar on both HA surfaces, suggesting that HA alone (without adsorbed serum proteins) is sufficient for cell attachment and spreading. Similarly, genes previously reported to be modulated by HA (glvr‐1, DMP‐1, osteoglycin, and proliferin 3) were modulated even in the absence of fetuin or other serum proteins. These data show that HA surface can be enriched selectively with fetuin from serum; however, neither fetuin or other serum proteins are required to mediate HA‐induced osteoblast attachment, spreading, or changes in expression of genes examined. This finding suggests that factors intrinsic to HA are required for the response. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res 73A: 39–47, 2005" @default.
- W2165932353 created "2016-06-24" @default.
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- W2165932353 date "2005-02-15" @default.
- W2165932353 modified "2023-10-17" @default.
- W2165932353 title "Adsorption of serum fetuin to hydroxylapatite does not contribute to osteoblast phenotype modifications" @default.
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- W2165932353 doi "https://doi.org/10.1002/jbm.a.30246" @default.
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