eIF5A isoforms and cancer: two brothers for two functions?

eIF5A isoforms and cancer: two brothers for two functions?
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DOI:
10.1007/s00726-011-1182-x
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发表时间:
2013-01
期刊:
影响因子:
3.5
通讯作者:
Abbruzzese A
Abbruzzese A
中科院分区:
生物学3区
文献类型:
--
作者:
Caraglia M;Park MH;Wolff EC;Marra M;Abbruzzese A

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真核细胞翻译起始因子5A(EIF5A)是唯一一种含有N-ε-(4-氨基-2-羟基丁基)赖氨酸的细胞蛋白质。本文就eIF5A蛋白中苏氨酸的形成在调节细胞增殖和凋亡中的作用作一综述。此外,脊椎动物携带两个基因,编码两种eIF5A亚型,eIF5A-1和eIF5A-2,在人类中,这两种亚型有84%的相同。然而,这两种亚型的生物学功能可能有很大的不同。事实上,eIF5A-1在不同组织起源的大多数细胞中都可检测到,而eIF5A-2蛋白仅在某些人类癌细胞或组织中检测到,这表明它是一个潜在的癌基因。在这篇综述中,我们将注意力集中在eIF5A-1在启动细胞凋亡程序和调控细胞增殖中的作用。此外,还描述了eIF5A-2在预测癌症患者生存方面的潜在致癌作用和预后意义。EIF5A-1和/或eIF5A-2亚型可作为一种新的分子诊断或预后标志物,或作为抗癌治疗的分子靶点。
Eukaryotic translation initiation factor 5A (eIF5A) is the only cellular protein that contains the unusual amino acid hypusine [Nε-(4-amino-2-hydroxybutyl)lysine]. The role of hypusine formation in the eIF5A protein in the regulation of cell proliferation and apoptosis is addressed in the present review. Moreover, vertebrates carry two genes that encode two eIF5A isoforms, eIF5A-1 and eIF5A-2, which, in humans, are 84% identical. However, the biological functions of these two isoforms may be significantly different. In fact, eIF5A-1 is demonstrable in most cells of different histogenesis, whereas eIF5A-2 protein is detectable only in certain human cancer cells or tissues, suggesting its role as a potential oncogene. In this review we focus our attention on the involvement of eIF5A-1 in the triggering of an apoptotic program and in the regulation of cell proliferation. In addition, the potential oncogenic role and prognostic significance of eIF5A-2 in the prediction of the survival of cancer patients is described. eIF5A-1 and/or the eIF5A-2 isoform may serve as a new molecular diagnostic or prognostic marker or as a molecular target for anti-cancer therapy.
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