Tissue- and age-dependent expression of RNA-binding proteins that influence mRNA turnover and translation.

Tissue- and age-dependent expression of RNA-binding proteins that influence mRNA turnover and translation.
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DOI:
10.18632/aging.100073
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发表时间:
2009-07-26
期刊:
Aging
影响因子:
--
通讯作者:
Gorospe M
Gorospe M
中科院分区:
其他
文献类型:
--
作者:
Masuda K;Marasa B;Martindale JL;Halushka MK;Gorospe M

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基因表达 模式以组织特异性和年龄依赖性方式显著变化。 调节mRNA周转和/或翻译的RNA结合蛋白 (TTR-RBP)严重影响表达蛋白的子集。 然而,在这方面, 关于组织和年龄依赖性表达的知之甚少, 人类的TTR-RBP。 在这里,我们使用人体组织阵列, 从不同年龄的捐赠者的器官活检,研究分布和 四种TTR-RBP的丰度:HuR、AUF 1、TIA-1和TTP。 HuR和AUF 1是 表达出非常相似的模式 两种TTR-RBP均存在于 在许多年龄段中,细胞百分比较高且显示出升高的强度 群体和组织,最明显的是在胃肠道和生殖 它们在泌尿系统和免疫系统中中度表达, 在肌肉和大脑中几乎检测不到。 TIA-1也很丰富 在许多组织和年龄组中,TIA-1表达水平较高, 胃肠道,免疫,泌尿和生殖系统,并在低 大脑和肌肉的水平。 相比之下,表达TTP的细胞,以及 TTP信号强度随着年龄的增长而下降,特别是在 免疫,神经和肌肉系统;然而,TTP水平仍然存在 在胃肠道中升高。 HuR的广泛存在, 全身和所有年龄组的AUF 1和TIA-1均呈明显差异 与人类二倍体成纤维细胞(HDF)中的下降水平形成对比 经历复制性衰老,这是一种老化的培养细胞模型。 相反,TTP水平在衰老的HDFs中增加,而TTP水平 随着年龄的增长而减少。 我们的研究提供了一个框架, 研究人TTR-RBP在整个人体不同组织中的功能 寿命
Gene expression patterns vary dramatically in a tissue-specific and age-dependent manner. RNA-binding proteins that regulate mRNA turnover and/or translation (TTR-RBPs) critically affect the subsets of expressed proteins. However, very little is known regarding the tissue- and age-dependent expression of TTR-RBPs in humans. Here, we use human tissue arrays containing a panel of organ biopsies from donors of different ages, to study the distribution and abundance of four TTR-RBPs: HuR, AUF1, TIA-1, and TTP. HuR and AUF1 were expressed with remarkably similar patterns. Both TTR-RBPs were present in high percentages of cells and displayed elevated intensities in many age groups and tissues, most notably in the gastrointestinal and reproductive systems; they were moderately expressed in the urinary and immune systems, and were almost undetectable in muscle and brain. TIA-1 was also abundant in many tissues and age groups; TIA-1 was expressed at high levels in the gastrointestinal, immune, urinary, and reproductive systems, and at low levels in brain and muscle. By contrast, TTP-expressing cells, as well as TTP signal intensities declined with advancing age, particularly in the immune, nervous, and muscular systems; however, TTP levels remained elevated in the gastrointestinal tract. The widespread abundance of HuR, AUF1, and TIA-1 throughout the body and in all age groups was in stark contrast with their declining levels in human diploid fibroblasts (HDFs) undergoing replicative senescence, a cultured-cell model of aging. Conversely, TTP levels increased in senescent HDFs, while TTP levels decreased with advancing age. Our studies provide a framework for the study of human TTR-RBP function in different tissues, throughout the human life span.
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