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• W2019860307 abstract "In Brief Study Design. Immunohistochemistry and in situ apoptosis detection assay were performed on chordoma and notochordal cells. Objectives. To investigate the expression levels of nerve growth factor (NGF) and its 2 receptors, tropomyosin-related kinase A (TrkA) and p75, as well as proliferation potential and apoptosis indexes in chordoma and notochordal cells. Summary of Background Data. Chordomas arise from primitive notochordal remnants. Why these notochordal remnants undergo malignant transformation to chordoma remains unknown. The binding of NGF to the TrkA receptor promotes cell survival, while its binding to the p75 receptor triggers apoptosis. If there is simultaneous expression of both receptors, the effect of TrkA supersedes and the cells survive. Methods. We examined 10 surgically obtained sacral chordoma tissue samples to determine the expressions of NGF and TrkA and p75 receptors as well as markers of cellular proliferation and apoptosis. As controls, we used notochordal cells of L4–L5 discs obtained from ten 1-month old rats. We quantified the expressions of NGF and TrkA and p75 receptors as well as markers of cellular proliferation and apoptosis for both groups, respectively. Results. Chordoma and notochordal cells both expressed NGF as well as TrkA and p75 receptors. While the mean percentage of p75 receptor expression was very similar between chordoma and notochordal cells (P = 0.394), the mean percentages of TrkA and NGF expressions were significantly higher in chordoma cells than in notochordal cells (both P = 0.002). The mean proliferation potential index of chordoma cells was significantly higher than in notochordal cells (P < 0.01). Conversely, the mean apoptosis index of chordoma cells was significantly lower compared with that of notochordal cells (P = 0.03). Conclusion. The current results suggest that increased expressions of NGF and TrkA receptor in chordoma cells might be a possible mechanism of malignant transformation of notochordal remnants to chordoma by negating apoptotic signal of p75 receptor. The expression levels of nerve growth factor and its tropomyosin-related kinase A (cell survival) and p75 (cell death) receptors as well as markers of cellular proliferation potential and apoptosis were investigated in chordoma and notochordal cells. We found that increased expressions of NGF and TrkA receptor in chordoma cells, which might be related to malignant transformation of notochordal remnants to chordoma by negating apoptotic signal of p75 receptor, than in notochordal cells." @default.
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• W2019860307 date "2007-08-01" @default.
• W2019860307 modified "2023-10-17" @default.
• W2019860307 title "Overexpressions of Nerve Growth Factor and Its Tropomyosin-Related Kinase A Receptor on Chordoma Cells" @default.
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• W2019860307 doi "https://doi.org/10.1097/brs.0b013e318133fbb5" @default.
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