通过BCR-ABL对RAS进行血液形成转换的替代信号
A Goga1, J McLaughlin, D E Afar
1Department of Microbiology and Molecular Genetics, University of California, Los Angeles 90095, USA.
Cell
|September 22, 1995
概括
在BCR-ABL的基因ABL.
科学领域:
- 瘤致癌信号通路的使用.
- 癌症发展的分子机制
背景情况:
- BCR-ABL瘤基因通过其激活的氨酸激酶活性驱动癌症.
- 像SRC同质性2 (SH2) 域这样的特定域对于BCR-ABL功能至关重要.
研究的目的:
- 研究BCR-ABL域和信号通路在细胞转化中的不同作用.
- 了解BCR-ABL如何激活RAS用于造血转化.
主要方法:
- 位点定向的突变发生,使关键的BCR-ABL域 (SH2,GRB2结合,自化位点) 失活.
- 对氨酸激酶活性,纤维细胞转化和血液细胞细胞系生长因子独立性的测试.
- 在体外转化原始骨髓细胞,并在体内评估恶性潜力.
- 操纵SHC适配蛋白水平以研究RAS信号传递.
主要成果:
- 在SH2域,GRB2结合位点或酶自酸化位点的突变损害了下游信号传导,但没有影响酶活性.
- 虽然纤维细胞的转化失去了,但突变者保留了造血细胞的转化能力.
- 在体内恶性潜在的SH2域被证明是关键的.
- SHC适配蛋白剂量显著影响了BCR-ABL转化效率,突出了其他RAS途径.
结论:
- BCR-ABL利用了多条并行通往RAS的途径进行造血转化.
- 该SH2域在BCR-ABL.的体内致癌活性中发挥着关键作用.
- 针对特定的BCR-ABL信号节点提供了潜在的治疗策略.
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