ATRA诱导神经母细胞瘤细胞分化及TrkB表达的研究

通过对神经母细胞瘤 (ｎｅｕｒｏｂｌａｓｔｏｍａ,ＮＢ)细胞系ＳＭＳ ＫＣＮＲ的体外实验 ,探讨全反式维甲酸 (ＡＴＲＡ)对ＮＢ细胞增殖抑制的可能分子机制及ＢＤＮＦ(脑源性神经 营养因子 ) ＴｒｋＢ信号转导途径在ＮＢ细胞分化中的作用。通过台盼蓝拒染计数活细胞 ;用倒置相差显微镜观察加药处理前后细胞形态学变化 ;通过Ｎｏｒｔｈｅｒｎ印迹杂交来分析ＴｒｋＢ基因表达情况的改变。结果 :5μＭＡＴＲＡ抑制ＮＢ细胞系ＳＭＳ ＫＣＮＲ细胞增殖 ,而 5ｎＭＡＴＲＡ无此作用 ;ＡＴＲＡ可诱导ＳＭＳ ＫＣＮＲ细胞分化成熟 ;细胞分化过程中伴随ＴｒｋＢ基因表达水平增高。结果显示 :5μＭＡＴＲＡ对人ＮＢ细胞系ＭＳＭ ＫＣＮＲ细胞的体外增殖有抑制作用 ;ＡＴＲＡ能诱导人ＮＢ细胞系ＳＭＳ ＫＣＮＲ细胞分化成熟 ;ＴｒｋＢ基因表达水平的增高可能是ＡＴＲＡ体外诱导ＮＢ细胞分化逆转的分子生物学机制之一。

Study on the induced differentiation of human NB cells and TrkB expression by ATRA

To investigate the possible molecular mechanisms of ATRA induced growth inhibition and the effect of BDNF TrkB signal transduction pathway on NB cell differentiation. Methods: Trypan blue exclusion is used to count the number of alive cells; Morphological differentiation is observed under the phase contrast microscope; Expression of TrkB gene before and after treatment of ATRA is analyzed using Northern blot analysis. Results: 5um ATRA but not 5nm ATRA inhibited NB cell growth; ATRA induced morphological differentiation of KCNR cells; The expression of TrkB gene was changed and the level of Trkb mRNA was increased during cell differentiation. Conclusion: 5um ATRA inhibited SMS KCNR NB cells growth; ATRA induced morphological differentiation of KCNR cells; The increase of TrkB gene expression is one of the molecular mechanisms of ATRA induced differentiation of human NB cells.