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mTORC1 silencing during intestinal epithelial Caco-2 cell differentiation is mediated by the activation of the

Harleen Kaur1, Régis Moreau1

  • 1Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA.

Biochemical and Biophysical Research Communications
|February 9, 2021
PubMed

Insights

The mechanistic target of rapamycin complex 1 (mTORC1) pathway is silenced during intestinal cell differentiation. This study identifies TSC2, AMPK, and PRAS40 as key regulators in this crucial process.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gastroenterology

Background:

  • Mechanistic target of rapamycin complex 1 (mTORC1) signaling regulates protein synthesis and proliferation.
  • mTORC1 activity is high in intestinal stem cells and decreases during differentiation.

Purpose of the Study:

  • To investigate the mechanism of mTORC1 silencing during intestinal epithelial cell differentiation.
  • To identify key regulators involved in repressing mTORC1 activity in differentiated cells.

Main Methods:

  • Utilized Caco-2 cell model, which spontaneously differentiates into enterocytes.
  • Analyzed the phosphorylation status of key proteins including TSC2, Raptor, ERK1/2, AKT, and PRAS40.

Main Results:

  • TSC2 plays a central role in mTORC1 silencing in differentiated Caco-2 cells.
  • AMPK-mediated TSC2 activation and Raptor repression were observed.
  • ERK1/2-mediated repression of TSC2 was lifted, and PRAS40 phosphorylation decreased, leading to mTORC1 inhibition.

Conclusions:

  • The study elucidates the molecular mechanisms underlying mTORC1 silencing during intestinal cell differentiation.
  • Identified a coordinated interplay of signaling pathways involving TSC2, AMPK, ERK1/2, AKT, and PRAS40 in regulating mTORC1 activity.
Keywords:
AKTERKEnterocytePRAS40RaptorTight junction protein

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