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Huffaker TB, Ekiz HA, Barba C, Lee SH, Runtsch MC, Nelson MC, Bauer KM, Tang WW, Mosbruger TL, Cox JE, Round JL, Voth WP, O'Connell RM. A Stat1 bound enhancer promotes Nampt expression and function within tumor associated macrophages. Nat Commun 2021; 12:2620. [PMID: 33976173 PMCID: PMC8113251 DOI: 10.1038/s41467-021-22923-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 03/30/2021] [Indexed: 02/03/2023] Open
Abstract
Tumor associated macrophage responses are regulated by distinct metabolic states that affect their function. However, the ability of specific signals in the local tumor microenvironment to program macrophage metabolism remains under investigation. Here, we identify NAMPT, the rate limiting enzyme in NAD salvage synthesis, as a target of STAT1 during cellular activation by interferon gamma, an important driver of macrophage polarization and antitumor responses. We demonstrate that STAT1 occupies a conserved element within the first intron of Nampt, termed Nampt-Regulatory Element-1 (NRE1). Through disruption of NRE1 or pharmacological inhibition, a subset of M1 genes is sensitive to NAMPT activity through its impact on glycolytic processes. scRNAseq is used to profile in vivo responses by NRE1-deficient, tumor-associated leukocytes in melanoma tumors through the creation of a unique mouse strain. Reduced Nampt and inflammatory gene expression are present in specific myeloid and APC populations; moreover, targeted ablation of NRE1 in macrophage lineages results in greater tumor burden. Finally, elevated NAMPT expression correlates with IFNγ responses and melanoma patient survival. This study identifies IFN and STAT1-inducible Nampt as an important factor that shapes the metabolic program and function of tumor associated macrophages.
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Affiliation(s)
- Thomas B Huffaker
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - H Atakan Ekiz
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Cindy Barba
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Soh-Hyun Lee
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Marah C Runtsch
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Morgan C Nelson
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - Kaylyn M Bauer
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | - William W Tang
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
| | | | - James E Cox
- Department of Biochemistry, University of Utah, Salt Lake City, UT, USA
- Metabolomics Core Research Facility, University of Utah, Salt Lake City, UT, USA
| | - June L Round
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
| | - Warren P Voth
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA.
| | - Ryan M O'Connell
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT, USA.
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.
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Mitani T, Watanabe S, Wada K, Fujii H, Nakamura S, Katayama S. Intracellular cAMP contents regulate NAMPT expression via induction of C/EBPβ in adipocytes. Biochem Biophys Res Commun 2019; 522:770-775. [PMID: 31791580 DOI: 10.1016/j.bbrc.2019.11.165] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 11/25/2019] [Indexed: 11/28/2022]
Abstract
A decline in intracellular nicotinamide adenine mononucleotide (NAD+) causes adipose tissue dysfunction. Nicotinamide phosphoribosyltransferase (NAMPT) catalyzes the rate-limiting step in the NAD+ biosynthesis pathway. However, the molecular mechanism that mediates regulation of NAMPT expression in adipocytes is yet to be elucidated. This study found that intracellular cAMP regulates NAMPT expression and promoter activity in 3T3-L1 adipocytes. cAMP-mediated Nampt promoter activity was suppressed by protein kinase A inhibitor H89, whereas AMP-activated protein kinase inhibitor compound C did not affect cAMP-mediated Nampt promoter activity. Intracellular cAMP induced CCAAT/enhancer-binding protein β (C/EBPβ) expression. Knockdown of C/EBPβ suppressed NAMPT expression and promoter activity. Furthermore, the Nampt promoter was activated by C/EBPβ, while LIP activated the dominant-negative form of C/EBPβ. Promoter sequence analysis revealed that the region from -96 to -76 on Nampt was required for C/EBPβ-mediated promoter activity. Additionally, chromatin immunoprecipitation assay demonstrated that C/EBPβ was bound to the promoter sequences of Nampt. Finally, NAMPT inhibitor FK866 suppressed adipogenesis in 3T3-L1 cells, and this suppressive effect was restored by nicotinamide mononucleotide treatment. These findings showed that intracellular cAMP increased NAMPT levels by induction of C/EBPβ expression and indicated that the induction of NAMPT expression was important for adipogenesis.
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Affiliation(s)
- Takakazu Mitani
- Graduate School of Science and Technology, Department of Agriculture, Division of Food Science and Biotechnology, Shinshu University, Kami-ina, Nagano, Japan.
| | - Shun Watanabe
- Graduate School of Science and Technology, Department of Agriculture, Division of Food Science and Biotechnology, Shinshu University, Kami-ina, Nagano, Japan
| | - Kenjiro Wada
- Department of Bioscience and Biotechnology, Shinshu University, Kami-ina, Nagano, Japan
| | - Hiroshi Fujii
- Graduate School of Science and Technology, Department of Biomedical Engineering, Shinshu University, Kami-ina, Nagano, Japan; Department of Biomolecular Innovation, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Kami-ina, Nagano, Japan
| | - Soichiro Nakamura
- Graduate School of Science and Technology, Department of Agriculture, Division of Food Science and Biotechnology, Shinshu University, Kami-ina, Nagano, Japan
| | - Shigeru Katayama
- Graduate School of Science and Technology, Department of Agriculture, Division of Food Science and Biotechnology, Shinshu University, Kami-ina, Nagano, Japan; Department of Biomolecular Innovation, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Kami-ina, Nagano, Japan
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Braidy N, Berg J, Clement J, Khorshidi F, Poljak A, Jayasena T, Grant R, Sachdev P. Role of Nicotinamide Adenine Dinucleotide and Related Precursors as Therapeutic Targets for Age-Related Degenerative Diseases: Rationale, Biochemistry, Pharmacokinetics, and Outcomes. Antioxid Redox Signal 2019; 30:251-294. [PMID: 29634344 PMCID: PMC6277084 DOI: 10.1089/ars.2017.7269] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 02/22/2018] [Accepted: 02/22/2018] [Indexed: 12/20/2022]
Abstract
Significance: Nicotinamide adenine dinucleotide (NAD+) is an essential pyridine nucleotide that serves as an essential cofactor and substrate for a number of critical cellular processes involved in oxidative phosphorylation and ATP production, DNA repair, epigenetically modulated gene expression, intracellular calcium signaling, and immunological functions. NAD+ depletion may occur in response to either excessive DNA damage due to free radical or ultraviolet attack, resulting in significant poly(ADP-ribose) polymerase (PARP) activation and a high turnover and subsequent depletion of NAD+, and/or chronic immune activation and inflammatory cytokine production resulting in accelerated CD38 activity and decline in NAD+ levels. Recent studies have shown that enhancing NAD+ levels can profoundly reduce oxidative cell damage in catabolic tissue, including the brain. Therefore, promotion of intracellular NAD+ anabolism represents a promising therapeutic strategy for age-associated degenerative diseases in general, and is essential to the effective realization of multiple benefits of healthy sirtuin activity. The kynurenine pathway represents the de novo NAD+ synthesis pathway in mammalian cells. NAD+ can also be produced by the NAD+ salvage pathway. Recent Advances: In this review, we describe and discuss recent insights regarding the efficacy and benefits of the NAD+ precursors, nicotinamide (NAM), nicotinic acid (NA), nicotinamide riboside (NR), and nicotinamide mononucleotide (NMN), in attenuating NAD+ decline in degenerative disease states and physiological aging. Critical Issues: Results obtained in recent years have shown that NAD+ precursors can play important protective roles in several diseases. However, in some cases, these precursors may vary in their ability to enhance NAD+ synthesis via their location in the NAD+ anabolic pathway. Increased synthesis of NAD+ promotes protective cell responses, further demonstrating that NAD+ is a regulatory molecule associated with several biochemical pathways. Future Directions: In the next few years, the refinement of personalized therapy for the use of NAD+ precursors and improved detection methodologies allowing the administration of specific NAD+ precursors in the context of patients' NAD+ levels will lead to a better understanding of the therapeutic role of NAD+ precursors in human diseases.
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Affiliation(s)
- Nady Braidy
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Sydney, Australia
| | - Jade Berg
- Australasian Research Institute, Sydney Adventist Hospital, Sydney, Australia
| | | | - Fatemeh Khorshidi
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Sydney, Australia
| | - Anne Poljak
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, Australia
- School of Medical Sciences, University of New South Wales, Sydney, Australia
| | - Tharusha Jayasena
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Sydney, Australia
| | - Ross Grant
- Australasian Research Institute, Sydney Adventist Hospital, Sydney, Australia
- School of Medical Sciences, University of New South Wales, Sydney, Australia
- Sydney Medical School, University of Sydney, Sydney, Australia
| | - Perminder Sachdev
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Sydney, Australia
- Neuropsychiatric Institute, Euroa Centre, Prince of Wales Hospital, Sydney, Australia
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