Nicotinamide mononucleotide, a key NAD(+) intermediate, treats the pathophysiology of diet- and age-induced diabetes in mice.

Nicotinamide mononucleotide, a key NAD(+) intermediate, treats the pathophysiology of diet- and age-induced diabetes in mice.
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DOI:
10.1016/j.cmet.2011.08.014
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发表时间:
2011-10-05
期刊:
影响因子:
29
通讯作者:
Imai S
Imai S
中科院分区:
生物学1区
文献类型:
--
作者:
Yoshino J;Mills KF;Yoon MJ;Imai S

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2型糖尿病(T2D)已成为我们现代生活方式中的流行病,可能是由于富含卡路里的饮食压倒了我们的适应性代谢途径。一种这样的途径是由烟酰胺磷酸核糖基转移酶(NAMPT)介导的,NAMPT是哺乳动物NAD+生物合成中的限速酶,以及NAD+依赖性蛋白脱乙酰酶SIRT 1。在这里,我们表明NAMPT介导的NAD+生物合成在代谢器官中受到高脂饮食(HFD)的严重损害。引人注目的是,烟酰胺单甘肽(NMN),NAMPT反应的产物和关键的NAD+中间体,通过恢复HFD诱导的T2D小鼠中的NAD+水平来改善葡萄糖耐受不良。NMN还增强肝脏胰岛素敏感性,并部分通过SIRT1激活恢复与氧化应激,炎症反应和昼夜节律相关的基因表达。此外,NAD+和NAMPT水平在衰老过程中在多个器官中显示出显著降低,并且NMN改善了年龄诱导的T2D小鼠的葡萄糖耐受不良和脂质谱。这些发现为潜在的营养干预提供了重要的见解,以对抗饮食和年龄诱导的T2D。
Type 2 diabetes (T2D) has become an epidemic in our modern lifestyle, likely due to calorie-rich diets overwhelming our adaptive metabolic pathways. One such pathway is mediated by nicotinamide phosphoribosyltransferase (NAMPT), the rate-limiting enzyme in mammalian NAD+ biosynthesis, and the NAD+-dependent protein deacetylase SIRT1. Here we show that NAMPT-mediated NAD+ biosynthesis is severely compromised in metabolic organs by high-fat diet (HFD). Strikingly, nicotinamide mononucleotide (NMN), a product of the NAMPT reaction and a key NAD+ intermediate, ameliorates glucose intolerance by restoring NAD+ levels in HFD-induced T2D mice. NMN also enhances hepatic insulin sensitivity and restores gene expression related to oxidative stress, inflammatory response, and circadian rhythm, partly through SIRT1 activation. Furthermore, NAD+ and NAMPT levels show significant decreases in multiple organs during aging, and NMN improves glucose intolerance and lipid profiles in age-induced T2D mice. These findings provide critical insights into a potential nutriceutical intervention against diet- and age-induced T2D.
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