RasGrf1: genomic imprinting, VSELs, and aging.

RasGrf1: genomic imprinting, VSELs, and aging.
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DOI:
10.18632/aging.100354
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发表时间:
2011-07
期刊:
Aging
影响因子:
--
通讯作者:
Bartke A
Bartke A
中科院分区:
其他
文献类型:
--
作者:
Ratajczak MZ;Kucia M;Liu R;Shin DM;Bryndza E;Masternak MM;Tarnowski M;Ratajczak J;Bartke A

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RasGrf1缺陷小鼠的寿命增加表明,RasGrf1缺陷促进长寿。有趣的是,RasGrf1是从父系染色体转录而来的亲本印迹基因之一。其印迹的消除导致RasGrf1下调,并已在多能成体组织来源的非常小的胚胎样干细胞(VSELs)群体中得到证实,这些干细胞参与组织器官再生。此外,根据最近的观察,RasGrf1信号分子位于胰岛素(Ins)和胰岛素样生长因子-1 (Igf-1)受体的下游,RasGrf1−/−小鼠的寿命延长可能支持减少Ins/Igf-1信号对寿命的有益作用。同样,血管内皮细胞中RasGrf1的下调使其对慢性Ins/Igf-1信号产生抗性,并防止成体组织过早耗竭。因此,在RasGrf1−/−小鼠中的研究表明,一些印迹基因可能在个体发育长寿中发挥作用,并表明存在起源于基因组水平的寿命性别差异。所有这些都支持了一个概念,即精子基因组可能对哺乳动物的寿命有不利影响。我们将讨论在基因组印迹和血管内皮细胞的背景下,RasGrf1在寿命中的作用。
Increase in life span in RasGrf1-deficient mice revealed that RasGrf1 deficiency promotes longevity. Interestingly, RasGrf1 is one of parentally imprinted genes transcribed from paternally-derived chromosome. Erasure of its imprinting results in RasGrf1 downregulation and has been demonstrated in a population of pluripotent adult tissues-derived very small embryonic like stem cells (VSELs), stem cells involved in tissue organ rejuvenation. Furthermore, based on recent observation that RasGrf1 signaling molecule is located downstream from insulin (Ins) and insulin like growth factor-1 (Igf-1) receptors, the extended life-span of RasGrf1−/− mice may support beneficial effect of reduced Ins/Igf-1 signaling on longevity. Similarly, downregulation of RasGrf1 in VSELs renders them resistant to chronic Ins/Igf-1 signaling and protects from premature depletion from adult tissues. Thus, the studies in RasGrf1−/− mice indicate that some of the imprinted genes may play a role in ontogenetic longevity and suggest that there are sex differences in life span that originate at the genome level. All this in toto supports a concept that the sperm genome may have a detrimental effect on longevity in mammals. We will discuss a role of RasGrf1 on life span in context of genomic imprinting and VSELs.
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