de Stanchina E, McCurrach M E, Zindy F, Shieh S Y, Ferbeyre G, Samuelson A V, Prives C, Roussel M F, Sherr C J, Lowe S W
Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724 USA.
Genes Dev. 1998 Aug 1;12(15):2434-42. doi: 10.1101/gad.12.15.2434.
The adenovirus E1A oncogene activates p53 through a signaling pathway involving the retinoblastoma protein and the tumor suppressor p19(ARF). The ability of E1A to induce p53 and its transcriptional targets is severely compromised in ARF-null cells, which remain resistant to apoptosis following serum depletion or adriamycin treatment. Reintroduction of p19(ARF) restores p53 accumulation and resensitizes ARF-null cells to apoptotic signals. Therefore, p19(ARF) functions as part of a p53-dependent failsafe mechanism to counter uncontrolled proliferation. Synergistic effects between the p19(ARF) and DNA damage pathways in inducing p53 may contribute to E1A's ability to enhance radio- and chemosensitivity.
腺病毒E1A癌基因通过一条涉及视网膜母细胞瘤蛋白和肿瘤抑制因子p19(ARF)的信号通路激活p53。在ARF基因缺失的细胞中,E1A诱导p53及其转录靶点的能力严重受损,这些细胞在血清饥饿或阿霉素处理后仍对凋亡具有抗性。重新导入p19(ARF)可恢复p53的积累,并使ARF基因缺失的细胞对凋亡信号重新敏感。因此,p19(ARF)作为p53依赖的故障安全机制的一部分发挥作用,以对抗不受控制的增殖。p19(ARF)和DNA损伤通路在诱导p53方面的协同作用可能有助于E1A增强放射敏感性和化学敏感性的能力。