Cox Adrienne D, Der Channing J
Department of Pharmacology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Oncogene. 2003 Dec 8;22(56):8999-9006. doi: 10.1038/sj.onc.1207111.
Mutational activation of Ras promotes oncogenesis by disrupting a multitude of normal cellular processes. Perhaps, best characterized and understood are the mechanisms by which oncogenic Ras promotes deregulated cell cycle progression and uncontrolled cellular proliferation. However, it is now clear that oncogenic Ras can also deregulate processes that control apoptosis. In light of the diversity of downstream effector targets known to facilitate Ras function, it is perhaps not surprising that Ras regulation of cell survival is complex, involving the balance and interplay of multiple signaling networks. While our understanding of these events is still far from complete, and is complicated by cell type and signaling context differences, several important mechanisms have begun to emerge. We review the role and mechanism of specific effectors in regulating the antiapoptotic (Raf, phosphatidylinositol 3-kinase and Tiam1) and apoptotic (Nore1 and RASSF1) actions of oncogenic Ras, and discuss the possibility that the effector actions of p120RasGAP make a significant contribution to Ras regulation of apoptotic events.
Ras的突变激活通过破坏多种正常细胞过程促进肿瘤发生。或许,致癌性Ras促进细胞周期进程失调和细胞不受控制地增殖的机制是最具特征且最易理解的。然而,现在很清楚的是,致癌性Ras也能使控制细胞凋亡的过程失调。鉴于已知促进Ras功能的下游效应靶点的多样性,Ras对细胞存活的调控很复杂,涉及多个信号网络的平衡和相互作用,这或许并不令人惊讶。虽然我们对这些事件的理解仍远未完整,且因细胞类型和信号背景差异而变得复杂,但一些重要机制已开始显现。我们综述了特定效应器在调节致癌性Ras的抗凋亡作用(Raf、磷脂酰肌醇3激酶和Tiam1)和凋亡作用(Nore1和RASSF1)中的作用及机制,并讨论了p120RasGAP的效应器作用对Ras调节凋亡事件有重大贡献的可能性。