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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
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Conversion of TNF alpha from antiproliferative to proliferative ligand in mouse intestinal epithelial cells by

G C Kaiser1, F Yan, D B Polk

  • 1Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee, 37232, USA.

Experimental Cell Research
|June 15, 1999
PubMed

Insights

Tumor necrosis factor alpha (TNFα) and epidermal growth factor (EGF) activate mitogen-activated protein (MAP) kinases in intestinal cells. The timing and location of MAP kinase activity influence cell proliferation, impacting gut health.

Area of Science:

  • Cell biology
  • Gastroenterology
  • Molecular signaling

Background:

  • Intestinal epithelial cell proliferation and differentiation are crucial for mucosal barrier integrity.
  • Mitogen-activated protein (MAP) kinases are key signal transducers in these cellular processes.
  • Understanding MAP kinase regulation by specific ligands is vital for comprehending intestinal homeostasis.

Purpose of the Study:

  • To investigate how tumor necrosis factor alpha (TNFα) and epidermal growth factor (EGF) regulate MAP kinase activity in intestinal epithelial cells.
  • To determine the impact of MAP kinase kinetics and subcellular localization on cell proliferation.
  • To explore the implications for inflammatory bowel disease.

Main Methods:

  • Utilized the young adult mouse colon (YAMC) cell line.
  • Administered TNFα and/or EGF, with and without the MEK1 inhibitor PD 98059.
  • Assessed cell proliferation via hemocytometry.
  • Identified activated MAP kinase using Western blot, in vitro kinase assays, and confocal microscopy.

Main Results:

  • Both TNFα and EGF activated MAP kinase in intestinal epithelial cells.
  • TNFα induced sustained nuclear MAP kinase activity, while EGF induced transient cytoplasmic activity.
  • Modifying TNFα's sustained activation to transient altered its effect from anti-proliferative to proliferative.

Conclusions:

  • The kinetics and subcellular localization of MAP kinase activation by TNFα and EGF are critical for divergent cellular responses in the intestinal epithelium.
  • These findings highlight the role of MAP kinase signaling in regulating intestinal cell fate.
  • Understanding these pathways offers insights into altered proliferative signals in inflammatory bowel disease.

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