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Study of Protein-protein Interactions in Autophagy Research
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Amino Acids in Autophagy: Regulation and Function.

James Z Shen1, Guoyao Wu2, Shaodong Guo3

  • 1Department of Nutrition, Texas A&M University, College Station, TX, 77843, USA.

Advances in Experimental Medicine and Biology
|July 12, 2021
PubMed
Summary

Autophagy removes cellular waste, but is inhibited by nutrients like amino acids and insulin. These signals activate mTORC1, a key regulator of cellular degradation and recycling processes.

Keywords:
Amino acidsArginineAutophagosomeAutophagyCalcium/calmodulin-dependent protein kinase kinaseLeucineLysosomeMammalian target of rapamycin complex 1Rag GTPaseRheb

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a fundamental cellular process for degrading and recycling intracellular components.
  • Basal autophagy maintains cellular homeostasis by removing damaged organelles and protein aggregates.
  • Nutrient availability, particularly amino acids and insulin, significantly influences autophagy activity.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which insulin and amino acids regulate autophagy.
  • To detail the role of mTOR complex 1 (mTORC1) signaling in autophagy inhibition.
  • To understand how nutrient sensing pathways converge on mTORC1 to control autophagosome formation.

Main Methods:

  • Investigated the PI3K class I-AKT pathway for insulin signaling.
  • Examined PI3K class III (hVps34) and amino acid sensors for amino acid signaling.
  • Analyzed the translocation of mTORC1 to the lysosomal membrane.
  • Studied the activation of mTORC1 by Rheb GTPase.

Main Results:

  • Insulin inhibits autophagy via the PI3K class I-AKT pathway, activating mTORC1.
  • Amino acids inhibit autophagy by activating mTORC1 through distinct pathways, including hVps34 and lysosomal sensors.
  • Amino acid sensing leads to mTORC1 translocation to the lysosome, where it is activated by Rheb GTPase.
  • mTORC1 activation by both insulin and amino acids occurs upstream of ULK1/2, inhibiting autophagosome formation.

Conclusions:

  • Insulin and amino acids are potent inhibitors of autophagy, acting through mTORC1 signaling.
  • Nutrient sensing pathways intricately regulate autophagy by controlling mTORC1 localization and activity.
  • Understanding these regulatory mechanisms is crucial for comprehending cellular homeostasis and metabolic control.