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Role of Nampt-Sirt6 axis in renal proximal tubules in extracellular matrix deposition in diabeteic nephropathy.

ABSTRACT: PT-specific Nampt knockout (CKO) mice exhibited TBM thickening and collagen deposition. Renal fibrotic changes in CKO mice are associated with the upregulation of the profibrogenic gene TIMP-1.

ORGANISM(S): Mus musculus

PROVIDER: GSE127437 | GEO | 2019/04/10

REPOSITORIES: GEO

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Role of Nampt-Sirt6 axis in renal proximal tubules in extracellular matrix deposition in diabeteic nephropathy.

Project description:Role of Nampt-Sirt6 axis in renal proximal tubules in extracellular matrix deposition in diabeteic nephropathy.

| PRJNA524790 | ENA

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).

2014-05-08 | E-GEOD-49784 | biostudies-arrayexpress

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

Project description:NAMPT is an enzyme in the mammalian NAD+ salvage pathway. Expression microarray analysis was used to study the effect of NAMPT knockdown on gene expression in MCF-7 breast cancer cells. Experiment Overall Design: Stable knockdown of NAMPT was achieved using a retroviral shRNA construct. An shRNA directed against Luciferase was used to generate the Luc control cells. Three independent biological replicates with matching Luc controls were analyzed using Affymetrix U133 A2.0 microarrays.

2009-06-08 | E-GEOD-13449 | biostudies-arrayexpress

Liver tissue transcriptomic analysis of db/db mice expressing adenovirus-delivered GFP or NAMPT

Project description:Hypothesis is that NAMPT overexpression alters liver transcriptomics in genetically diabetic, obese db/db mice. We treated db/db mice n = 4 with adenovirus encoding GFP or NAMPT by tail-vein delivery.

2022-08-01 | E-MTAB-10984 | biostudies-arrayexpress

Expression analysis upon NAMPT knockdown in MCF-7 cells

2009-05-28 | GSE13449 | GEO

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

2014-05-08 | GSE49784 | GEO

NAMPT-dependent NAD+ biosynthesis controls circadian metabolism in a tissue-specific manner

Project description:Molecular clocks in the periphery coordinate tissue-specific daily biorhythms by integrating input from the hypothalamic master clock and intracellular metabolic signals. One such key metabolic signal is the cellular concentration of NAD+, which oscillates along with its biosynthetic enzyme, nicotinamide phosphoribosyltransferase (NAMPT). NAD+ levels feed back into the clock to influence rhythmicity of biological functions, yet whether this metabolic fine-tuning occurs ubiquitously across cell types and is a core clock feature is unknown. Here we show that NAMPT-dependent control over the molecular clock varies substantially between tissues. Brown adipose tissue (BAT) requires NAMPT to sustain the amplitude of the core clock, whereas rhythmicity in white adipose tissue (WAT) is only moderately dependent on NAD+ biosynthesis and the skeletal muscle clock is completely refractory to loss of NAMPT. In BAT and WAT, NAMPT differentially orchestrates oscillation of clock-controlled gene networks and the diurnality of metabolite levels. NAMPT coordinates the rhythmicity of TCA cycle intermediates in BAT, but not WAT, and loss of NAD+ abolishes these oscillations similarly to high fat diet (HFD)-induced circadian disruption. Adipose NAMPT depletion also improved the ability of animals to defend body temperature during cold stress but this is independent of time-of-day. Thus, our findings reveal that peripheral molecular clocks and metabolic biorhythms are shaped in a highly tissue-specific manner by NAMPT-dependent NAD+ synthesis.

2023-04-11 | GSE221550 | GEO

Screening of genes differentiating transcriptional profiles of CIA rats at different NAMPT expression statuses

Project description:We screened out differentially expressed genes between CIA rats and healthy controls at both NAMPT++ (CIA1) and NAMPT+ (CIA2) statuses.It was obvious that that high expression of NAMPT is linked to acute inflammation, as TLRs and its downstream MAPKs and NF-κB were identified as the most affected pathways in NAMPT++ samples compared with normal control. However, by the decrease of NAMPT expression, the pathological situation was not eased but became even more complicated. Energy metabolism (mainly lipid metabolism) was significantly altered at this status. Interestingly, many RA-related pathways emerged, such as TGF-β, IL-17, PI3K-AKT and osteoclast differentiation pathways. These results solidly support the hypothesis that NAMPT overexpression is an early event in CIA and directly affects the innate rather than adaptive immunity.

2022-01-09 | GSE192633 | GEO

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.

2023-07-01 | GSE207060 | GEO

Role of SIRT1 in NAMPT-induced liver gene expression

Project description:We tested they hypothesis that hepatocyte SIRT1 mediates transcriptomic changes induced by hepatocyte-specific NAMPT overexpression

2021-09-21 | GSE184394 | GEO

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