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Glutamine Flux Imaging Using Genetically Encoded Sensors
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Glutamine sensing licenses cholesterol synthesis.

Bruna Martins Garcia1, Philipp Melchinger1, Tania Medeiros1

  • 1Max Planck Institute for Biology of Ageing, Cologne, Germany.

The EMBO Journal
|October 21, 2024
PubMed
Summary

The amino acid glutamine activates the cholesterol-producing mevalonate pathway. Glutamine deficiency disrupts cholesterol synthesis by blocking the trafficking of SCAP and SREBP2, key regulators of cholesterol production.

Keywords:
CholesterolHMGCRMFN2Nutrient SensingSREBP2

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Metabolic Regulation

Background:

  • The mevalonate pathway synthesizes essential lipids like cholesterol.
  • While negative regulators are known, positive regulators of this pathway remain largely uncharacterized.
  • Understanding pathway activators is crucial for metabolic control.

Purpose of the Study:

  • To identify metabolites that positively regulate the mevalonate pathway.
  • To elucidate the mechanism by which glutamine activates cholesterol synthesis.
  • To explore therapeutic strategies for cholesterol level management.

Main Methods:

  • Investigated the role of glutamine in activating the mevalonate pathway using cell culture.
  • Assessed cholesterol synthesis and gene transcription under glutamine starvation.
  • Utilized techniques to track SCAP/SREBP2 trafficking and rescue pathway activity.
  • Examined a cell model with enhanced glutamine uptake and impaired mitochondrial respiration.

Main Results:

  • Glutamine is essential for activating the mevalonate pathway and cholesterol synthesis.
  • Glutamine starvation inhibits pathway transcription by disrupting ER-to-Golgi SCAP trafficking, preventing SREBP2 activation.
  • Restoring SCAP/SREBP2 function or nuclear SREBP2 expression rescued pathway activity.
  • Enhanced glutamine uptake correlated with increased SREBP2 activation and cholesterol levels.

Conclusions:

  • The mevalonate pathway senses and is activated by glutamine via a novel mechanism involving SCAP/SREBP2 trafficking.
  • Glutamine metabolism plays a critical role in regulating cholesterol biosynthesis.
  • Targeting glutamine synthesis offers a potential strategy for managing cholesterol in disease states.