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Related Concept Videos

Other Glycolytic Pathways01:24

Other Glycolytic Pathways

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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Glycolysis, the Embden-Meyerhof pathway, is a central metabolic pathway involved in glucose catabolism. It is highly conserved across most organisms, reflecting its fundamental role in cellular energy production. This process occurs in the cytoplasm and can function both in the presence and absence of oxygen, making it versatile for various organisms and environmental conditions.Stages of GlycolysisGlycolysis is a ten-step pathway that converts glucose into pyruvate, generating a net gain of...
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Extracellular Glucose Depletion as an Indirect Measure of Glucose Uptake in Cells and Tissues Ex Vivo
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The polyol pathway is an evolutionarily conserved system for sensing glucose uptake.

Hiroko Sano1, Akira Nakamura2, Mariko Yamane3

  • 1Department of Molecular Genetics, Institute of Life Science, Kurume University, Kurume, Fukuoka, Japan.

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Summary

The polyol pathway senses glucose fluctuations, regulating the ChREBP/MondoA transcription factor for metabolic adaptation. This conserved pathway is crucial for cellular glucose response and organismal growth.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Metabolism

Background:

  • Cells require dynamic adjustment of metabolic enzymes due to nutrient variability.
  • Glucose metabolism regulation heavily relies on the transcription factor ChREBP/MondoA.
  • Mechanisms of glucose fluctuation sensing by ChREBP/MondoA remain unclear.

Purpose of the Study:

  • To elucidate how glucose fluctuations are sensed by ChREBP/MondoA.
  • To investigate the role of the polyol pathway in glucose sensing.
  • To understand the conserved mechanisms of metabolic remodeling.

Main Methods:

  • Investigated the polyol pathway's role in glucose sensing in Drosophila and mice.
  • Analyzed the nuclear translocation of Mondo (Drosophila ChREBP/MondoA homolog) in response to glucose.
  • Examined the impact of polyol pathway inhibition on ChREBP nuclear localization and glucose tolerance in mice.

Main Results:

  • The polyol pathway, converting glucose to fructose via sorbitol, is essential for ChREBP/MondoA activation.
  • Activation of the polyol pathway regulates the glucose-dependent nuclear translocation of Mondo in flies.
  • Inhibition of the polyol pathway in mice impairs ChREBP nuclear localization and reduces glucose tolerance.

Conclusions:

  • The polyol pathway acts as a conserved glucose-sensing system.
  • This pathway is critical for metabolic remodeling in response to glucose uptake.
  • The polyol pathway links glucose metabolism to gene expression via ChREBP/MondoA.