A novel insight into aging: are there pluripotent very small embryonic-like stem cells (VSELs) in adult tissues overtime depleted in an Igf-1-dependent manner?

A novel insight into aging: are there pluripotent very small embryonic-like stem cells (VSELs) in adult tissues overtime depleted in an Igf-1-dependent manner?
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对衰老的新颖见解:成人组织中有多能的非常小的胚胎样干细胞(VSEL)以IGF-1依赖性方式耗尽的加班时间吗?

DOI:
10.18632/aging.100231
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发表时间:
2010-11
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;Shin DM;Ratajczak J;Kucia M;Bartke A

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组织器官的年轻化和衰老与干细胞的功能密切相关。最近,我们证明了一群多能 Oct-4+ SSEA-1+Sca-1+Lin-CD45- 非常小的胚胎样干细胞 (VSEL) 存在于成年小鼠骨髓 (BM) 和其他小鼠组织中。我们假设这些多能干细胞在组织/器官再生中发挥重要作用,并证明它们的增殖和潜在的过早耗竭受到一些调节胰岛素因子信号传导的印记基因(Igf2-H19位点、Igf2R和RasGRF1)的表观遗传变化的负面控制。由于胰岛素/胰岛素生长因子(Ins/Igf)信号的减弱与寿命呈正相关,根据我们的实验数据,我们认为,在整个生命过程中以 Ins/Igf 信号依赖的方式沉积在成人组织中的 VSEL 数量逐渐减少是衰老的重要机制。相反,减少 VSEL 的 Ins/Igf 刺激可延长这些细胞在成体器官中的半衰期,这将对寿命产生有益影响。我们在长寿 Igf-1 信号传导缺陷小鼠中的初步数据表明,这些动物在成年 BM 中沉积的 VSEL 数量高出 3-4 倍,为这一新假设提供了支持。
Tissue and organ rejuvenation and senescence/aging are closely related to the function of stem cells. Recently, we demonstrated that a population of pluripotent Oct-4+ SSEA-1+Sca-1+Lin-CD45- very small embryonic-like stem cells (VSELs) resides in the adult murine bone marrow (BM) and other murine tissues. We hypothesize that these pluripotent stem cells play an important role in tissue/organ rejuvenation, and have demonstrated that their proliferation and potentially premature depletion is negatively controlled by epigenetic changes of some imprinted genes that regulate insulin factor signaling (Igf2-H19 locus, Igf2R and RasGRF1). Since the attenuation of insulin/insulin growth factor (Ins/Igf) signaling positively correlates with longevity, we propose, based on our experimental data, that gradual decrease in the number of VSELs deposited in adult tissues, which occurs throughout life in an Ins/Igf signaling-dependent manner is an important mechanism of aging. In contrast, a decrease in Ins/Igf stimulation of VSELs that extends the half life of these cells in adult organs would have a beneficial effect on life span. Our preliminary data in long-living Igf-1-signaling-deficient mice show that these animals possess a 3-4 times higher number of VSELs deposited in adult BM, lending support to this novel hypothesis.
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