Cited by 287Sirtuins and Resveratrol in MedicineBiochemical and Molecular ResearchDrug Transport and Resistance Mechanisms

Slc12a8 is a nicotinamide mononucleotide transporter

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Grozio, Alessia, Mills, Kathryn F., Yoshino, Jun, Bruzzone, Santina, Sociali, Giovanna, Tokizane, Kyohei, Lei, Hanyue Cecilia, Cunningham, Richard +3 more·2019·Nature Metabolism

Abstract

Nicotinamide mononucleotide (NMN) is a biosynthetic precursor of NAD+ known to promote cellular NAD+ production and counteract age-associated pathologies associated with a decline in tissue NAD+ levels. How NMN is taken up into cells has not been entirely clear. Here we show that the Slc12a8 gene encodes a specific NMN transporter. We find that Slc12a8 is highly expressed and regulated by NAD+ in the murine small intestine. Slc12a8 knockdown abrogates the uptake of NMN in vitro and in vivo. We further show that Slc12a8 specifically transports NMN, but not nicotinamide riboside, and that NMN transport depends on the presence of sodium ion. Slc12a8 deficiency significantly decreases NAD+ levels in the jejunum and ileum, which is associated with reduced NMN uptake as traced by doubly labeled isotopic NMN. Finally, we observe that Slc12a8 expression is upregulated in the aged murine ileum, which contributes to the maintenance of ileal NAD+ levels. Our work identifies the first NMN transporter and demonstrates that Slc12a8 has a critical role in regulating intestinal NAD+ metabolism.

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  • Expression of a gut transporter supports the possibility that NMN is bioavailable through oral delivery.

    “The expression of a transporter in the gut [76] reinforces that NMN could be made bioavailable through oral delivery.”
  • Slc12a8 is an NMN transporter highly expressed and regulated by NAD+ in murine small intestine, and its deficiency abrogates NMN uptake in vitro and in vivo.

    “A newly reported NMN transporter, the Slc12a8, is highly expressed and regulated by NAD+, in the murine small intestine, and Slc12a8 deficiency abrogates the uptake of NMN in vitro and in vivo (Grozio et al., 2019).”

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

  • Through slc12a8, 26-month-old mice that took NMN increased their NAD+ levels to close to 3 months old, increasing cell energy in aged mice.

    “through a transporter called slc12a8, 26-month-old mice (equivalent to 70 human years) that took NMN increased their NAD+ levels to close to 3 months old (equivalent to 12 human months). The content level in young mice increased the cell energy in aged mice [208].”

    From Immunosenescence: a key player in cancer development (2020) · cites this paper as [208]

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Authors
Grozio, A., Mills, K. F., Yoshino, J., Bruzzone, S., Sociali, G., Tokizane, K., Lei, H. C., Cunningham, R., Sasaki, Y., Migaud, M. E., & Imai, S.-I.
Affiliations
  • Washington University in St. Louis (US)
  • University of Genoa (IT)
  • USA Mitchell Cancer Institute (US)
Corresponding author
Imai, Shin-ichiro
Venue
Nature Metabolism
Published
2019-01-07
Volume
1
Issue
1
Pages
47-57
ISSN
2522-5812 (ISSN-L)
OpenAlex
W2903854778
Cited by
287
References
48
Citations by year
2026: 33 · 2025: 37 · 2024: 41 · 2023: 48 · 2022: 39 · 2021: 33 · 2020: 31 · 2019: 22 · 2018: 1
FWCI
12.04
Type
journal article
Language
en
Open access
Locations
  • Nature Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • CINECA IRIS Institutial Research Information System (University of Genoa) (submittedVersion)
Funders
  • National Institutes of Health (1c06rr015502-01, UL1TR002345)
  • Biotechnology and Biological Sciences Research Council (BB/N001842/1)
  • National Institute on Aging (R01AG024150, R01AG037457, R01AG047902)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P30DK056341, P30DK020579)
  • National Center for Research Resources (C06-RR-015502)
  • National Center for Advancing Translational Sciences
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 › Oncology › Drug Transport and Resistance Mechanisms
Keywords
NAD+ metabolism, small intestine, sodium-dependent transport, aging, nicotinamide riboside, NAD biosynthesis

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