Serum from calorie-restricted animals delays senescence and extends the lifespan of normal human fibroblasts in vitro.

Serum from calorie-restricted animals delays senescence and extends the lifespan of normal human fibroblasts in vitro.
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卡路里限制动物的血清延迟衰老,并在体外延伸正常人成纤维细胞的寿命。

DOI:
10.18632/aging.100719
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发表时间:
2015-03
期刊:
Aging
影响因子:
--
通讯作者:
Irusta PM
Irusta PM
中科院分区:
其他
文献类型:
--
作者:
de Cabo R;Liu L;Ali A;Price N;Zhang J;Wang M;Lakatta E;Irusta PM

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随着时间的推移,各种组织和器官中细胞衰老和细胞损失的累积效应被认为是衰老过程的主要促成因素。在各种生物体中,热量限制(CR)至少部分地通过激活沉默调节蛋白家族的烟酰胺腺嘌呤二核苷酸(NAD+)依赖性蛋白质脱乙酰酶来减缓衰老并延长寿命。在这里,我们使用CR的体外模型来研究这种饮食制度对复制衰老,细胞寿命和正常人二倍体成纤维细胞中SIRT1信号通路的调节的影响。我们发现,与自由采食动物的血清相比,热量限制动物的血清能够延缓衰老,并显着增加这些细胞的复制寿命。这些作用与CR介导的SIRT1增加和p53表达水平降低相关。此外,我们还发现,通过过度表达或siRNA介导的敲低来操纵SIRT1水平分别导致细胞衰老延迟和加速。我们的研究结果表明,CR可以延缓衰老,并在体外增加正常人二倍体成纤维细胞的复制寿命,并表明SIRT1在这些过程中发挥了重要作用。(185话)。
The cumulative effects of cellular senescence and cell loss over time in various tissues and organs are considered major contributing factors to the ageing process. In various organisms, caloric restriction (CR) slows ageing and increases lifespan, at least in part, by activating nicotinamide adenine dinucleotide (NAD+)-dependent protein deacetylases of the sirtuin family. Here, we use an in vitro model of CR to study the effects of this dietary regime on replicative senescence, cellular lifespan and modulation of the SIRT1 signaling pathway in normal human diploid fibroblasts. We found that serum from calorie-restricted animals was able to delay senescence and significantly increase replicative lifespan in these cells, when compared to serum from ad libitum fed animals. These effects correlated with CR-mediated increases in SIRT1 and decreases in p53 expression levels. In addition, we show that manipulation of SIRT1 levels by either over-expression or siRNA-mediated knockdown resulted in delayed and accelerated cellular senescence, respectively. Our results demonstrate that CR can delay senescence and increase replicative lifespan of normal human diploid fibroblasts in vitro and suggest that SIRT1 plays an important role in these processes. (185 words).
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