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Dysregulation of the TGF-β Postreceptor'Signaling Pathway in Cell Lines Derived from Primary or Metastatic Ovarian Cancer

Transforming growth factor-beta (TGF-β) may cause cell cycle arrest, terminal differentiation, or apoptosis in most normal epithelial cells, whereas most malignant cell lines are resistant to TGF-β. Mechanisms of resistance to TGF-β caused by modulation of cell cycle regulators and/or inactivation o...

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Published in:Journal of Huazhong University of Science and Technology. Medical sciences 2004, Vol.24 (1), p.62-65
Main Author: 奚玲 胡伟 孟力 周剑峰 卢运萍 王常玉 马丁
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container_title Journal of Huazhong University of Science and Technology. Medical sciences
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description Transforming growth factor-beta (TGF-β) may cause cell cycle arrest, terminal differentiation, or apoptosis in most normal epithelial cells, whereas most malignant cell lines are resistant to TGF-β. Mechanisms of resistance to TGF-β caused by modulation of cell cycle regulators and/or inactivation of components of the TGF-β signaling transduction pathway such as C-myc and Smad4 are not well understood. To investigate the potential association between loss of sensitivity to TGF-β and expression status of transforming growth factor receptor Ⅱ (TβRⅡ), Smad4, CDC25A and C-myc in 14 cell lines derived from ovarian cancer, the expression levels of these genes were detected by semi-quantitative RT-PCR. Normal ovarian surface tissues were used as controls. The expression of TβRⅡ was detectable in all of 14 cell lines. The expression of Smad4 was decreased in 10 cell lines and 9 cell lines overexpressed CDC25A, as compared to normal controls. CDC25A genewas overexpressed with 88% (8/9) in tumorigenic cell lines as determined by xenografts in nude mice, and only in 20% (1/5) of non-tumorigenic cell lines (P
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Mechanisms of resistance to TGF-β caused by modulation of cell cycle regulators and/or inactivation of components of the TGF-β signaling transduction pathway such as C-myc and Smad4 are not well understood. To investigate the potential association between loss of sensitivity to TGF-β and expression status of transforming growth factor receptor Ⅱ (TβRⅡ), Smad4, CDC25A and C-myc in 14 cell lines derived from ovarian cancer, the expression levels of these genes were detected by semi-quantitative RT-PCR. Normal ovarian surface tissues were used as controls. The expression of TβRⅡ was detectable in all of 14 cell lines. The expression of Smad4 was decreased in 10 cell lines and 9 cell lines overexpressed CDC25A, as compared to normal controls. CDC25A genewas overexpressed with 88% (8/9) in tumorigenic cell lines as determined by xenografts in nude mice, and only in 20% (1/5) of non-tumorigenic cell lines (P&lt;0.05). C-myc was not overexpressed in any of these cell lines. 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ispartof Journal of Huazhong University of Science and Technology. Medical sciences, 2004, Vol.24 (1), p.62-65
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subjects Animals
cdc25 Phosphatases - metabolism
Cell Line, Tumor
DNA-Binding Proteins - metabolism
Female
Humans
Mice
Mice, Nude
Ovarian Neoplasms - metabolism
Ovarian Neoplasms - pathology
Proto-Oncogene Proteins c-myc - metabolism
Receptors, Transforming Growth Factor beta - metabolism
Signal Transduction
Smad4 Protein
Trans-Activators - metabolism
Transforming Growth Factor beta - pharmacology
信号通道
卵巢肿瘤
细胞周期
肿瘤转移
转化生长因子-β
title Dysregulation of the TGF-β Postreceptor'Signaling Pathway in Cell Lines Derived from Primary or Metastatic Ovarian Cancer
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