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SLAM-ITseq identifies that Nrf2 induces liver regeneration through the pentose phosphate pathway

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Danio rerio

PROVIDER: GSE230832 | GEO | 2024/01/13

REPOSITORIES: GEO

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SLAM-ITseq identifies that Nrf2 induces liver regeneration through the pentose phosphate pathway [Larval SLAM-Itseq]

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The Pentose Phosphate Pathway Regulates the Circadian Clock.

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The pentose phosphate pathway regulates the circadian clock

Project description:The circadian clock is a ubiquitous timekeeping system that organizes the behavior and physiology of organisms over the day and night. The clockwork orchestrates a multitude of metabolic processes as illustrated by previous global transcriptomics and proteomics studies, and the existence of daily rhythms of reduction and oxidation (redox) in a range of diverse species. However, the reciprocal question of whether metabolism can alter the clockwork remains largely unaddressed. Here we identify the pentose phosphate pathway (PPP), a critical source of cellular reducing power in the form of NADPH, as an important modulator of circadian oscillations. We show that genetic and pharmacologic inhibition of the PPP perturbs circadian gene expression and metabolic rhythms in human cells. Pharmacologic inhibition of the PPP caused similar effects in mouse tissues, and altered the pattern of rhythmic behavior in Drosophila. These manipulations also altered genome wide DNA-binding activity of the circadian transcription factors BMAL1 and CLOCK through a mechanism likely involving the redox-sensitive histone acetyltransferase p300. Thus, disruption of the PPP regulates circadian rhythms via modulation of NADPH metabolism, highlighting redox reactions as a novel connector of metabolic cycles and transcriptional oscillations in nucleated cells.

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The Pentose Phosphate Pathway in pathogenic Francisella

Project description:Metabolic pathways are now considered as intrinsic virulence attributes of pathogenic bacteria and hence represent potential targets for anti-bacterial strategies. Here, we addressed the role of the pentose phosphate pathway (PPP) and its connections with other metabolic pathways in the pathophysiology of Francisella novicida. We have previously shown that this intracellular bacterial pathogen used gluconeogenesis to metabolize host-derived nutrients in the cytosolic compartment of infected macrophages. Francisella species, which lacks the oxidative branch of the PPP, are equipped with all the genes of the non-oxidative branch (i.e. tktA, tal, rpiA and rpe, encoding transketolase, transaldolase, ribose-phosphate isomerase and ribulose phosphate epimerase, respectively). The involvement of the PPP in the early stage of intracellular life cycle of F. novicida was first demonstrated with the study of PPP inactivation mutants. Indeed, inactivation of tktA, rpiA or rpe genes, severely impaired intramacrophagic multiplication during the first 24–hours. However, time-lapse video microscopy demonstrated that rpiA and rpe mutants were able to resume late intracellular bacterial multiplication. To get further insight into the links between the PPP and other metabolic networks of the bacterium, we next performed a thorough proteo-metabolomic analysis of these mutants. We show that the PPP constitutes a major bacterial metabolic hub with multiple connections with glycolysis, tricarboxylic acid cycle and other metabolic pathways, such as fatty acid degradation and sulfur metabolism. Hence, our study highlights how, by its multiple connections with other metabolic pathways, PPP is instrumental to Francisella pathogenesis and growth in its intracellular niche.

2021-07-27 | PXD023550 | Pride

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