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Title 

Restoration of mitochondrial NAD+ levels delays stem cell senescence and facilitates reprogramming of aged somatic cells

Authors 

Myung Jin SonYoujeong KwonT SonYee Sook Cho

Publisher 

Wiley-Blackwell

Issue Date 

2016

Citation 

Stem Cells, vol. 34, no. 12, pp. 2840-2851

Keywords 

AgingMitochondriaNADNicotinamide mononucleotide adenylyltransferase 3Nicotinamide nucleotide transhydrogenase

Abstract 

The fundamental tenet that aging is irreversible has been challenged by the development of reprogramming technology that can restore molecular and cellular age by reversing the progression of aging. The use of cells from aged individuals as sources for reprogramming or transplantation creates a major barrier in stem cell therapy with respect to cell quality and quantity. Here, we investigated the molecular features underlying senescence and rejuvenation during aged cell reprogramming and identified novel factors that can overcome age-associated barriers. Enzymes, such as nicotinamide nucleotide transhydrogenase (NNT) and nicotinamide mononucleotide adenylyltransferase 3 (NMNAT3), that control mitochondrial NAD+ levels appear to be susceptible to aging. In aged cells, mitochondrial NAD+ levels decrease, accompanied by reduced SIRT3 activity; these changes severely impede cell fate transition. However, in cells collected from aged p16 knockout mice, which exhibit delayed cellular senescence, no changes in NNT or NMNAT3 expression were found. Importantly, restoring mitochondrial NAD+ levels by overexpressing NNT and NMNAT3 enhanced reprogramming efficiency of aged somatic cells and extended the lifespan of human mesenchymal stem cells by delaying replicative senescence. These results demonstrate that maintenance of mitochondrial NAD+ levels is critical for reversing the mechanisms of aging and ensuring that cells collected from aged individuals are of high quality. Stem Cells 2016; 34:2840?2851.

ISSN 

1066-5099

Link 

http://dx.doi.org/10.1002/stem.2460

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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