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Stat1-induced NAMPT sustains glycolysis to regulate gene expression in classically activated macrophages

ABSTRACT: Single Cell RNA Sequencing is used to profile in vivo responses by immune cells lacking the Nampt NRE1 region to melanoma challenge, finding multiple defects in macrophages and other myeloid APCs. We analyzed B16F10 melanoma tumor infiltrating immune cells from mice specifically lacking NRE1 in hematopoietic cells, finding inflammatory and metabolic defects in APC populations within tumors, correlating with trends toward defective control of malignant growth.

ORGANISM(S): Mus musculus

PROVIDER: GSE135814 | GEO | 2019/10/01

REPOSITORIES: GEO

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RNA-sequencing of murine B16F10 melanoma cells with IFNg and FK866, a Nampt inhibitor

Project description:NAMPT is expressed in all cells during normal cell homeostasis. However, melanoma cells have a higher energetic demand and increase NAMPT expression. Our data show that IFNg signaling upregulates NAMPT in both human and mouse melanoma cells leading to increased cell growth and expression kinetics. The purpose of this experiment was to identify how IFNg inducible Nampt alters cell kinetics and we did this by treating melanoma cells with the combination of IFNg and FK866.

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The role of nicotinamide phosphoribosyltransferase (Nampt) in hippocampal neural stem/progenitor cells

Project description:Neural stem/progenitor cell (NSPC) proliferation and self-renewal, as well as insult-induced differentiation, decrease markedly with age, but the molecular mechanisms responsible for these declines remain unclear. Here we show that levels of NAD+ and nicotinamide phosphoribosyltransferase (Nampt), the rate-limiting enzyme in mammalian NAD+ biosynthesis, decrease with age in the hippocampus. Ablation of Nampt in adult NSPCs reduced their pool and proliferation in vivo. The decrease in the NSPC pool during aging can be rescued by enhancing hippocampal NAD+ levels. Nampt is the main source of NSPC NAD+ levels and required for G1/S progression of the NSPC cell cycle. Nampt is also critical for oligodendrocytic lineage fate decisions through a mechanism mediated redundantly by Sirt1 and Sirt2. Ablation of Nampt in the adult NSPCs in vivo reduced NSPC-mediated oligodendrogenesis upon injury. These phenotypes recapitulate defects in NSPCs during aging, implicating Nampt-mediated NAD+ biosynthesis as a mediator of these age-associated functional declines. Total RNA obtained from neurospheres derived from postnatal hippocampi subjected to 48 hours in vitro of incubation with Nampt-specific inhibitor FK866 (10 nM, 4 samples) or vehicle (DMSO, 1:1000, 4 samples).

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Stat1-induced NAMPT sustains glycolysis to regulate gene expression in classically activated macrophages

Project description:Stat1-induced NAMPT sustains glycolysis to regulate gene expression in classically activated macrophages

| PRJNA560187 | ENA

The role of nicotinamide phosphoribosyltransferase (Nampt) in hippocampal neural stem/progenitor cells

2014-05-08 | GSE49784 | GEO

Stat1-induced NAMPT sustains NAD levels to regulate gene expression in classically activated macrophages

Project description:Stat1-induced NAMPT sustains NAD levels to regulate gene expression in classically activated macrophages

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RNAi profiling of human MCF-7 cells depleted for NAMPT knockdown

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Stat1-induced NAMPT sustains NAD levels to regulate gene expression in classically activated macrophages

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