Name: NAD+/NADH Redox Alterations Reconfigure Metabolism and Rejuvenate Senescent Human Mesenchymal Stem Cells In Vitro
Keywords: Msc

Dataset Information

NAD+/NADH Redox Alterations Reconfigure Metabolism and Rejuvenate Senescent Human Mesenchymal Stem Cells In Vitro

ABSTRACT: Human mesenchymal stem cells (hMSCs) promote endogenous tissue regeneration and have become a promising candidate for cell therapy. However, in vitro culture expansion of hMSCs induces a rapid decline of stem cell properties through replicative senescence. Here we characterize metabolic profiles of hMSCs during expansion. We show that alterations of cellular nicotinamide adenine dinucleotide (NAD+ /NADH) redox balance and activity of the Sirtuin (Sirt) family enzymes regulate cellular senescence of hMSCs. Treatment with NAD+ precursor nicotinamide increases the intracellular NAD+ level and re-balances the NAD+ /NADH ratio, with enhanced Sirt-1 activity in hMSCs at high passage, partially restores mitochondrial fitness and rejuvenates senescent hMSCs. By contrast, human fibroblasts exhibit limited senescence as their cellular NAD+ /NADH balance is comparatively stable during expansion. These results indicate a potential metabolic and redox connection to replicative senescence in adult stem cells and identify NAD+ as a metabolic regulator that distinguishes stem cells from mature cells. This study also suggests potential strategies to maintain cellular homeostasis of hMSCs in clinical applications.

INSTRUMENT(S): LTQ Orbitrap, 6340 Ion Trap LC/MS

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Stem Cell

SUBMITTER: Xuegang Yuan

LAB HEAD: Yan Li

PROVIDER: PXD022395 | Pride | 2021-09-09

REPOSITORIES: Pride

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Publications

NAD<sup>+</sup>/NADH redox alterations reconfigure metabolism and rejuvenate senescent human mesenchymal stem cells in vitro.

Yuan Xuegang X Liu Yijun Y Bijonowski Brent M BM Tsai Ang-Chen AC Fu Qin Q Logan Timothy M TM Ma Teng T Li Yan Y

Communications biology 20201215 1

Human mesenchymal stem cells (hMSCs) promote endogenous tissue regeneration and have become a promising candidate for cell therapy. However, in vitro culture expansion of hMSCs induces a rapid decline of stem cell properties through replicative senescence. Here, we characterize metabolic profiles of hMSCs during expansion. We show that alterations of cellular nicotinamide adenine dinucleotide (NAD + /NADH) redox balance and activity of the Sirtuin (Sirt) family enzymes regulate cellular senescen ...[more]

PMID: 33319867

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Project description:Alzheimer's disease (AD) is a severe neurodegenerative disorder. Clinical trials to identify agents to treat AD have failed, and its underlying molecular pathology and etiology remain elusive. Neuroinflammation is thought to play a key role in the progression of AD. Emerging evidence has identified lower Nicotinamide adenine dinucleotide (NAD+) levels as a major factor in neurodegeneration, especially in AD. NAD+ is an important metabolite in all human cells, as it is at the convergence of many central processes in cellular and mitochondrial maintenance, including DNA repair and mitophagy (the degradation of damaged mitochondria). Our previous work found that treatment of 3xTgAD mice with an NAD+ precursor, nicotinamide riboside (NR), can improve key AD features including tau phosphorylation and learning deficits in mice. Here we used the APP/PS1 AD mouse model to interrogate the effect of NR on neuroinflammation. Microarray analysis revealed major changes in pathways and genes associated with inflammation and the APP/PS1 mice had lower NAD+ levels than WT mice. Thus, seven months old mice were treated with NR for five months and their NAD+/NADH ratio increased. Brain neuroinflammation decreased as determined by decreased activation of astrocytes and microglia, decreased pro-inflammatory cytokines and chemokines in the brains of the APP/PS1 mice. NR decreased neuroinflammation by lowering the NLRP3 inflammasome and NF-κB pathways. NR also attenuated DNA damage and apoptosis in the AD mouse brains. NR dramatically decreased senescence in the hippocampus and cortex of AD mice, relative to controls. Recent studies suggest that cyclic GMP-AMP synthase (cGAS) and stimulator of interferon genes (STING) activation are associated with DNA damage and senescence. cGAS-STING was activated in AD mice and decreases after NR treatment. Suggesting that NR can diminish neuroinflammation and senescence through the cGAS-STING pathway. NR treatment also greatly improved cognition and synaptic function in the APP/PS1 mice. We propose that the cGAS-STING pathway should be evaluated as a potential novel therapeutic target in AD.

Dataset Information

NAD+/NADH Redox Alterations Reconfigure Metabolism and Rejuvenate Senescent Human Mesenchymal Stem Cells In Vitro

Publications

NAD<sup>+</sup>/NADH redox alterations reconfigure metabolism and rejuvenate senescent human mesenchymal stem cells in vitro.

Similar Datasets

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