在Rac-依赖细胞迁移中,Drosophila IAP1-介导的卡斯巴酶抑制的作用
Erika R Geisbrecht1, Denise J Montell
1Department of Biological Chemistry, Johns Hopkins School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, USA.
Cell
|July 10, 2004
概括
果虫边界细胞迁移揭示了DIAP1在Rac介导的细胞机动性中具有独立于亡的作用. 通过DIAP1或Dark蛋白抑制Dronc可以挽救RacN17迁移缺陷,突出了DIAP1.1的一个新功能.
科学领域:
- 细胞生物学 细胞生物学
- 发展生物学 发展生物学
- 遗传学 是一个遗传学.
背景情况:
- 在Drosophila的边界细胞迁移作为表皮细胞向迁移细胞过渡的模型.
- Rac GTPase信号传递对于调节细胞迁移至关重要,主导负Rac抑制了这一过程.
- 了解参与Rac-依赖细胞运动的基因是解读迁移机制的关键.
研究的目的:
- 识别调节Rac-依赖细胞运动的新型基因.
- 为了研究多索菲拉细胞亡抑制剂1 (DIAP1) 在细胞迁移中的作用.
- 阐明DIAP1在Rac介导运动中的功能机制.
主要方法:
- 抑制主导阴性Rac诱导迁移缺陷的抑制剂的遗传选.
- 对编码DIAP1.1的线程 (th) 基因过度表达和功能丧失的研究.
- 对影响Dark蛋白的突变进行分析,Dronc caspase激活剂.
主要成果:
- 过度表达DIAP1 (通过线程编码) 抑制了主导阴性Rac诱导的迁移缺陷.
- 线程中的功能丧失突变会导致迁移缺陷,而不会诱导亡.
- "黑暗中的突变"也拯救了RacN17的迁移缺陷,这表明一种独立于亡的途径.
结论:
- 在Rac介导的细胞机动性中,DIAP1扮演着由亡独立的角色.
- 通过DIAP1介导的caspase Dronc的抑制参与调节Rac-依赖细胞迁移.
- 这项研究揭示了DIAP1的新功能,超出了细胞移动性中细胞亡调节的范围.
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