Cited by 206Sirtuins and Resveratrol in MedicineBiochemical and Molecular ResearchFolate and B Vitamins Research

Elevation of cellular NAD levels by nicotinic acid and involvement of nicotinic acid phosphoribosyltransferase in human cells

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Hara, Nobumasa, Yamada, Kazuo, Shibata, Tomoko, Osago, Harumi, Hashimoto, Tatsuya, Tsuchiya, Mikako·2007·Journal of Biological Chemistry

Abstract

NAD plays critical roles in various biological processes through the function of SIRT1. Although classical studies in mammals showed that nicotinic acid (NA) is a better precursor than nicotinamide (Nam) in elevating tissue NAD levels, molecular details of NAD synthesis from NA remain largely unknown. We here identified NA phosphoribosyltransferase (NAPRT) in humans and provided direct evidence of tight link between NAPRT and the increase in cellular NAD levels. The enzyme was abundantly expressed in the small intestine, liver, and kidney in mice and mediated [(14)C]NAD synthesis from [(14)C]NA in human cells. In cells expressing endogenous NAPRT, the addition of NA but not Nam almost doubled cellular NAD contents and decreased cytotoxicity by H(2)O(2). Both effects were reversed by knockdown of NAPRT expression. These results indicate that NAPRT is essential for NA to increase cellular NAD levels and, thus, to prevent oxidative stress of the cells. Kinetic analyses revealed that NAPRT, but not Nam phosphoribosyltransferase (NamPRT, also known as pre-B-cell colony-enhancing factor or visfatin), is insensitive to the physiological concentration of NAD. Together, we conclude that NA elevates cellular NAD levels through NAPRT function and, thus, protects the cells against stress, partly due to lack of feedback inhibition of NAPRT but not NamPRT by NAD. The ability of NA to increase cellular NAD contents may account for some of the clinically observed effects of the vitamin and further implies a novel application of the vitamin to treat diseases such as those associated with the depletion of cellular NAD pools.

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Crossref · 10.1074/jbc.m610357200

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46 of 46 references verified0 citation errors · 0 not checkable

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  • Blood NA and NAM can cross the plasma membrane, whereas blood NAD+ cannot be taken up directly and must be converted to smaller uncharged molecules.

    “Experimental evidence suggests that blood NA and NAM are able to cross the plasma membrane, while blood NAD+ cannot be taken up by cells directly but needs to be converted to smaller uncharged molecules to enter the cells (Hara et al., 2007; Ratajczak et al., 2016).”

    From NAD+ in Brain Aging and Neurodegenerative Disorders (2019) · cites this paper as Hara et al., 2007

  • Trigonelline or NA failed to raise NAD+ levels in HepG2 and C2C12 cells, which have low NAPRT expression.

    “trigonelline or NA failed to raise NAD+ levels in HepG2 (ref. 34) and C2C12 cells, which have low NAPRT expression (Extended Data Fig. 1g,h)”

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Authors
Hara, N., Yamada, K., Shibata, T., Osago, H., Hashimoto, T., & Tsuchiya, M.
Affiliations
Shimane University (JP)
Corresponding author
Hara, Nobumasa
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2007-08
Volume
282
Issue
34
Pages
24574-24582
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2083287520
Cited by
205
References
46
Citations by year
2026: 3 · 2025: 7 · 2024: 15 · 2023: 14 · 2022: 23 · 2021: 15 · 2020: 11 · 2019: 7 · 2018: 16 · 2017: 10 · 2016: 8 · 2015: 10 · 2014: 11 · 2013: 8 · 2012: 4
FWCI
4.80
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
Keywords
nicotinic acid, NAD levels, visfatin, NAD biosynthesis, SIRT1, oxidative stress, hydrogen peroxide cytotoxicity, nicotinamide
MeSH terms
Animals, HeLa Cells, Humans, Kinetics, Mice, Inbred BALB C, Models, Biological, Molecular Sequence Data, NAD, Niacin, Pentosyltransferases, Tissue Distribution, Oxidative Stress, RNA, Small Interfering, Mice, Rats

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