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- W2060042145 abstract "Osteosarcoma, fibrous dysplasia, and myositis ossificans contain osteoid-producing cells that are not necessarily morphologically typical osteoblasts. Nevertheless, these pathologic cells may share differentiation steps with osteoblasts at the molecular level. Osteocalcin, a bone-specific extracellular matrix protein, is a marker of mature osteoblasts. Osteocalcin is upregulated by the transcription factor core-binding factor alpha 1, which is responsible for commitment to the osteoblastic lineage, and is downregulated by MSX2, a homeobox-containing transcription factor expressed during the early proliferative phase of osteoblast differentiation. Semiquantitative reverse transcription-polymerase chain reaction was used to compare expression levels of osteocalcin, core-binding factor alpha 1, and MSX2 in 34 osteosarcoma, five fibrous dysplasia, and five myositis ossificans specimens, as well as in seven normal cortical bone samples. Despite normal or elevated levels of core-binding factor alpha-1 expression in most specimens, osteocalcin expression was low or undetectable in most cases of osteosarcoma (25 of 34) and myositis ossificans (4 of 5). Single-strand conformation polymorphism and sequencing did not identify and mutations in the DNA-binding domain of core-binding factor alpha 1. However, a high level of MSX2 expression was demonstrated in these lesions, which may inhibit osteocalcin transcription. The presence of moderate levels of osteocalcin in fibrous dysplasia may contribute to the characteristic disconnected appearance of trabeculae in that entity because osteocalcin is a negative regulator of bone formation." @default.
- W2060042145 created "2016-06-24" @default.
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- W2060042145 date "1999-09-01" @default.
- W2060042145 modified "2023-10-12" @default.
- W2060042145 title "Expression of osteocalcin and its transcriptional regulatorscore-binding factor alpha 1 andMSX2 in osteoid-forming tumours" @default.
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- W2060042145 doi "https://doi.org/10.1002/jor.1100170503" @default.
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