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mTORC1 Prevents Epithelial Damage During Inflammation and Inhibits Colitis-Associated Colorectal Cancer Development.

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Interferon gamma (IFNγ) activates mTORC1 in intestinal cells, inhibiting proliferation. Inhibiting mTORC1 worsens colitis and cancer, suggesting its role in preventing DNA damage and tumor development.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • Intestinal epithelial cells form a critical barrier, maintaining homeostasis.
  • Colitis disrupts this barrier, decreasing epithelial cell proliferation and increasing cell death.
  • The underlying mechanisms for these changes remain unclear.

Purpose of the Study:

  • To investigate the role of the pro-inflammatory cytokine IFNγ in regulating intestinal epithelial cell proliferation during colitis.
  • To elucidate the signaling pathways involved in IFNγ-mediated effects on intestinal epithelial cells (IECs) and macrophages.
  • To assess the impact of modulating mTORC1 signaling on colitis and associated colorectal cancer (CRC) development.

Main Methods:

  • Utilized a colitis model to study epithelial cell homeostasis and immune responses.
  • Investigated the activation of mTORC1 signaling in IECs and colonic macrophages in response to IFNγ.
  • Examined the effects of mTORC1 inhibition on cell proliferation, DNA damage, and inflammatory markers.
  • Assessed disease activity, mucosal damage, survival, and tumor formation following mTORC1 inhibition in a CRC-associated colitis model.

Main Results:

  • IFNγ induces mTORC1 activation in IECs and colonic macrophages, inhibiting epithelial cell proliferation.
  • mTORC1 inhibition enhanced IEC proliferation but also increased DNA damage.
  • In macrophages, mTORC1 inhibition reduced pro-inflammatory marker expression.
  • mTORC1 inhibition exacerbated colitis, increasing mucosal damage, ulceration, cell infiltration, and mortality, while stimulating tumor formation in the CRC model.

Conclusions:

  • mTORC1 signaling, activated by IFNγ, plays a protective role in intestinal epithelial cells during colitis.
  • This pathway prevents epithelial DNA damage and inhibits cancer development in the context of colitis.
  • Targeting mTORC1 may have detrimental effects on colitis and CRC progression.