Transforming growth factor-β (TGF-β) is a multifunctional peptide growth factor with a wide range of effects. TGF-β signals are conveyed through cell-surface serine/threonine kinase receptors to the downstream cyto...Transforming growth factor-β (TGF-β) is a multifunctional peptide growth factor with a wide range of effects. TGF-β signals are conveyed through cell-surface serine/threonine kinase receptors to the downstream cytoplasmic mediators, known as Smads proteins. Receptor-regulated Smads become phosphorylated by activated type Ⅰ receptors and form heteromeric complexes with a common Smad-Smad4, which translocates into the nucleus to regulate gene transcription. Inhibitory Smads inhibit the activation of receptor-regulated Smads. There are positive, negative and feedback regulations in the Smads mediated TGF-β signaling pathway.展开更多
文摘Transforming growth factor-β (TGF-β) is a multifunctional peptide growth factor with a wide range of effects. TGF-β signals are conveyed through cell-surface serine/threonine kinase receptors to the downstream cytoplasmic mediators, known as Smads proteins. Receptor-regulated Smads become phosphorylated by activated type Ⅰ receptors and form heteromeric complexes with a common Smad-Smad4, which translocates into the nucleus to regulate gene transcription. Inhibitory Smads inhibit the activation of receptor-regulated Smads. There are positive, negative and feedback regulations in the Smads mediated TGF-β signaling pathway.
文摘目的探讨转化生长因子β1对脑胶质瘤细胞SF767细胞侵袭能力的影响以及可能的分子机制。方法转化生长因子β1分别干预脑胶质瘤细胞SF767细胞12、24、48 h,Western blotting检测EMT和ERK/MAPK通路相关蛋白表达情况,MTT法检测和对比干预前后细胞增殖情况,体外侵袭实验观察细胞侵袭能力改变。结果 Western blotting显示E-cadherin表达下调,而Vimentin和MMP-2表达上调。在ERK/MAPK信号转导通路中,ERK表达未见变化,但P-ERK表达上调,核转录因子Zeb-1表达增强。体外增殖实验显示干预后细胞倍增时间明显缩短;体外侵袭实验显示干预后穿膜细胞明显增多,统计学显示有显著性差异(P<0.05)。结论转化生长因子β1可能通过ERK/MAPK信号转导通路诱导EMT促进脑胶质瘤细胞SF767细胞侵袭。
