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Regulation of Small Intestinal Epithelial Homeostasis by Tsc2-mTORC1 Signaling

Jajar Setiawan1,2, Takenori Kotani1, Tasuku Konno1

  • 1Division of Molecular and Cellular Signaling, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Japan.

The Kobe Journal of Medical Sciences
|July 23, 2019
PubMed

Insights

Tuberous sclerosis complex 2 (Tsc2) deletion in intestinal epithelial cells (IECs) activates mammalian target of rapamycin complex 1 (mTORC1) signaling. This impacts IEC proliferation, migration, and differentiation, affecting intestinal homeostasis.

Area of Science:

  • Cell Biology
  • Gastroenterology
  • Molecular Biology

Background:

  • Mammalian target of rapamycin complex 1 (mTORC1) integrates growth signals but its role in intestinal epithelial cells (IECs) is unclear.
  • Tuberous sclerosis complex 2 (Tsc2) is a known negative regulator of mTORC1 signaling.

Purpose of the Study:

  • To investigate the physiological roles of Tsc2-mTORC1 signaling in IEC homeostasis.
  • To determine the effects of Tsc2 ablation in IECs on intestinal epithelial cell behavior.

Main Methods:

  • Generation of mice with specific Tsc2 ablation in IECs (Tsc2 CKO mice).
  • Analysis of mTORC1 pathway activation via downstream molecule phosphorylation.
  • Assessment of IEC proliferation, migration, apoptosis, and differentiation in vivo.
  • In vitro studies using intestinal organoids.

Main Results:

  • Tsc2 ablation in IECs led to enhanced mTORC1 signaling.
  • Tsc2 CKO mice exhibited increased IEC proliferation and migration.
  • Mutant mice showed elevated IEC apoptosis and ectopic Paneth cell formation.
  • In vitro, Tsc2 ablation promoted intestinal organoid development, which was reversed by an mTORC1 inhibitor.

Conclusions:

  • Tsc2-mTORC1 signaling is a critical regulator of IEC proliferation, migration, and positioning.
  • This pathway plays a significant role in maintaining intestinal homeostasis.
  • Targeting Tsc2-mTORC1 signaling may offer therapeutic potential for intestinal disorders.
Keywords:
Mammalian target of rapamycin complex 1Intestinal epithelial cellsIntestinal homeostasisSmall intestineTuberous sclerosis complex 2

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