Fibroblast growth factor 2 internal ribosome entry site (IRES) activity ex vivo and in transgenic mice reveals a stringent tissue-specific regulation.

Fibroblast growth factor 2 internal ribosome entry site (IRES) activity ex vivo and in transgenic mice reveals a stringent tissue-specific regulation.
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DOI:
10.1083/jcb.150.1.275
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发表时间:
2000-07-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Prats AC
Prats AC
中科院分区:
其他
文献类型:
--
作者:
Créancier L;Morello D;Mercier P;Prats AC

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成纤维细胞生长因子2(FGF-2)是一种强大的有丝分裂原,参与包括神经元在内的各种细胞的增殖、分化和存活。FGF-2的表达受到抑制性调节;特别是,FGF-2 mRNA含有允许帽非依赖性翻译的内部核糖体进入位点(IRES)。在这里,我们分析了FGF-2 IRES组织特异性离体和体内使用双荧光素酶双顺反子载体。这种IRES在大多数瞬时转染的人类和非人类细胞类型中具有活性,在p53 −/−骨肉瘤和神经母细胞瘤细胞系中具有更高的活性。使用具有FGF-2 IRES或脑心肌炎病毒(EMCV)IRES的双顺反子转基因产生转基因小鼠。荧光素酶活性的测量结果显示,在11天大的胚胎(E11)中FGF-2 IRES活性较高,但在胎盘中没有;在E16的心脏和大脑中活性较高。FGF-2 IRES活性在成人的大多数器官中较低,但在大脑中异常高。EMCV IRES没有观察到这种时空变化。这些数据证明了哺乳动物IRES在体内的强组织特异性,表明在胚胎发生期间和成年脑中FGF-2表达的翻译IRES依赖性激活的关键作用。因此,FGF-2 IRES可以构成中枢神经系统中基因转移的有力工具。
Fibroblast growth factor 2 (FGF-2) is a powerful mitogen involved in proliferation, differentiation, and survival of various cells including neurons. FGF-2 expression is translationally regulated; in particular, the FGF-2 mRNA contains an internal ribosome entry site (IRES) allowing cap-independent translation. Here, we have analyzed FGF-2 IRES tissue specificity ex vivo and in vivo by using a dual luciferase bicistronic vector. This IRES was active in most transiently transfected human and nonhuman cell types, with a higher activity in p53 −/− osteosarcoma and neuroblastoma cell lines. Transgenic mice were generated using bicistronic transgenes with FGF-2 IRES or encephalomyocarditis virus (EMCV) IRES. Measurements of luciferase activity revealed high FGF-2 IRES activity in 11-d-old embryos (E11) but not in the placenta; activity was high in the heart and brain of E16. FGF-2 IRES activity was low in most organs of the adult, but exceptionally high in the brain. Such spatiotemporal variations were not observed with the EMCV IRES. These data, demonstrating the strong tissue specificity of a mammalian IRES in vivo, suggest a pivotal role of translational IRES- dependent activation of FGF-2 expression during embryogenesis and in adult brain. FGF-2 IRES could constitute, thus, a powerful tool for gene transfer in the central nervous system.
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