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- W2327932076 abstract "The authors examined the distribution of tumor growth factor-β (TGF-β) isoforms and receptors in 35 giant cell tumor (GCT) of bone in comparison with a group of benign giant cell-containing lesions of bone, including 5 aneurysmal bone cysts, 2 cases of brown tumor of hyperparathyroidism, 3 nonossifying fibromas, and 7 cases of giant cell reparative granuloma. The results of immunohistochemical analysis of GCT showed a complete absence of TGF-β1 expression in both mononuclear tumor cells and giant cells. Only reactive bone present within the tumor showed an intense immunoreactivity. Transforming growth factor-β2 and TGF-β3 were detected in the majority of cases (97.1% and 82.8%, respectively), whereas TGF-β receptor type I (TGF-β RI) and type II (TGF-β RII) were diffusely expressed in all cases. Reverse transcription-polymerase chain reaction (RT-PCR) analysis performed on 10 GCTs with specific oligonucleotide primers demonstrated the presence of mRNA transcripts for TGF-β1, 2, 3, and for TGF-β RI and RII. Quantitative measurements of TGF-β1 in conditioned media from primary cultures of GCT showed undetectable or very low amounts of the cytokine (0–23 pg/mL). The results of immunohistochemical analysis showed that all giant cell-containing lesions of bone were at least focally positive for the 3 isoform of TGF-β, with positivity present both in osteoclast-like giant cells and mononuclear cells, and diffusely positive for TGF-β RI and RII. Reverse transcription-polymerase chain reaction analysis conducted on samples from 3 nonossifying fibromas and 1 giant cell reparative granuloma confirmed the expression of the corresponding mRNA. In conclusion, according to the current data, GCT of bone can be distinguished from other giant cell-containing lesions of bone on the basis of the absence of TGF- β1 expression at the protein level, which appears to be the result of posttranslational regulation processes." @default.
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- W2327932076 date "2001-06-01" @default.
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- W2327932076 title "TGF-β Isoform and Receptor Expression in Giant Cell Tumor and Giant Cell Lesions of Bone" @default.
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- W2327932076 doi "https://doi.org/10.1097/00129039-200106000-00010" @default.
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