Nicotinamide riboside

Nicotinamide riboside, a form of vitamin B3 and NAD+ precursor, is converted to bioavailable NAD+, via nicotinamide riboside kinase (NRK) and NMNAT, or by the action of nucleoside phosphorylase and NAM salvage^[1-2].

In in vitro experiments ,nicotinamide riboside attenuates alcohol induced liver injuries via activation of SirT1/PGC-1α/mitochondrial biosynthesis pathway ^[3]. Nicotinamide Riboside Enhances In Vitro Beta-adrenergic Brown Adipose Tissue Activity in Humans^[4].

Nicotinamide Riboside was able to enhance the skeletal muscle NAD+ metabolome, inducing gene expression signatures implicated in downregulation of energy metabolism pathways, but did not affect muscle mitochondrial bioenergetics or metabolism^[5]. Nicotinamide Riboside enhances deacetylase activity in vivo, deacetylates PGC-1α in muscle, liver, and BAT, and it induces deacetylase activity in tissues where NAD+ accumulates^[6].

References:
[1] Bieganowski P., Brenner C. Discoveries of nicotinamide riboside as a nutrient and conserved NRK genes establish a Preiss-Handler independent route to NAD+ in fungi and humans. Cell.2004;117:495–502.
[2] Nikiforov A., Dolle C., Niere M. Pathways and subcellular compartmentation of NAD biosynthesis in human cells: from entry of extracellular precursors to mitochondrial NAD generation. J. Biol. Chem. 2011;286:21767–21778.
[3] Wang S, Wan T, et al. Nicotinamide riboside attenuates alcohol induced liver injuries via activation of SirT1/PGC-1α/mitochondrial biosynthesis pathway. Redox Biol. 2018 Jul;17:89-98.
[4] Nascimento EBM, Moonen MPB, et al. Nicotinamide Riboside Enhances In Vitro Beta-adrenergic Brown Adipose Tissue Activity in Humans. J Clin Endocrinol Metab. 2021 Apr 23;106(5):1437-1447.
[5] Elhassan YS, Kluckova K, et al. Nicotinamide Riboside Augments the Aged Human Skeletal Muscle NAD+ Metabolome and Induces Transcriptomic and Anti-inflammatory Signatures. Cell Rep. 2019 Aug 13;28(7):1717-1728.e6.
[6] Cantó C, Houtkooper RH,et al. The NAD(+) precursor nicotinamide riboside enhances oxidative metabolism and protects against high-fat diet-induced obesity. Cell Metab. 2012 Jun 6;15(6):838-47.