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Methods to Determine Lysosomal AMPK Activation.

Chen-Song Zhang1, Sheng-Cai Lin2

  • 1State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, China.

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PubMed
Summary
This summary is machine-generated.

AMP-activated protein kinase (AMPK) can be activated independently of AMP/ADP on lysosomes via aldolase sensing low glucose metabolite fructose-1,6-bisphosphate (FBP). This pathway, shared by metformin and mannose, involves TRPV channels and v-ATPase.

Keywords:
AMPKAXINAldolaseLKB1LysosomeRagulatorTRPVv-ATPase

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Area of Science:

  • Cellular Metabolism
  • Molecular Biology
  • Biochemistry

Background:

  • AMP-activated protein kinase (AMPK) is crucial for cellular energy homeostasis.
  • Canonical AMPK activation relies on AMP and ADP binding.
  • A novel, non-canonical AMPK activation pathway has been identified on the lysosome surface.

Purpose of the Study:

  • To detail experimental methods for identifying lysosomal AMPK activation.
  • To differentiate lysosomal AMPK activation from the canonical pathway.
  • To elucidate the molecular players and conditions triggering lysosomal AMPK activation.

Main Methods:

  • Assessing AXIN lysosomal translocation.
  • Measuring AMP:ATP and ADP:ATP ratios.
  • Determining lysosomal pH and TRPV channel activity.
  • Utilizing glucose metabolite fructose-1,6-bisphosphate (FBP) as a sensor.

Main Results:

  • Lysosomal AMPK activation is independent of AMP and ADP.
  • Aldolase acts as an FBP sensor, initiating the pathway.
  • TRPV channel inhibition and altered lysosomal pH are key.
  • Metformin and mannose utilize this lysosomal pathway.

Conclusions:

  • A distinct lysosomal AMPK activation pathway exists, distinct from canonical mechanisms.
  • This pathway is regulated by glycolytic intermediates and ion channel activity.
  • Understanding this pathway offers insights into metabolic drug actions.