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Related Experiment Videos

Decrease of glutaminase expression by interferon-gamma in human intestinal epithelial cells

P Sarantos1, Z Abouhamze, E M Copeland

  • 1Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston 02114.

Annals of Surgical Oncology
|September 1, 1994
PubMed
Summary
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Interferon-gamma (IFN-gamma) reduces gut mucosal glutaminase activity by decreasing enzyme protein and messenger RNA levels. This cytokine-mediated effect may explain diminished glutamine metabolism in cancer hosts.

Area of Science:

  • Cellular metabolism
  • Cancer biology
  • Gastrointestinal physiology

Background:

  • Glutaminase is crucial for energy and growth, highly expressed in rapidly dividing tissues like tumors and intestinal epithelium.
  • Cancer hosts exhibit reduced gut mucosal glutaminase activity, but the regulatory mechanisms remain unclear.
  • Cytokines are investigated for their potential role in regulating altered glutamine metabolism in cancer.

Purpose of the Study:

  • To investigate the effects of cytokines on gut mucosal glutaminase expression in vitro.
  • To elucidate the regulatory mechanisms behind diminished glutamine metabolism in cancer patients.

Main Methods:

  • Human enterocytic Caco-2 cells were treated with Interleukin (IL)-1, IL-6, tumor necrosis factor, or interferon-gamma (IFN-gamma).

Related Experiment Videos

  • Glutaminase activity, kinetic parameters (Vmax, Km), protein concentration (Western blot), and messenger RNA levels (Northern hybridization) were assessed.
  • Differentiated confluent cells were incubated for 12 hours prior to analysis.

    • Main Results:

    • Only IFN-gamma significantly altered glutaminase activity, decreasing Vmax by 25% without affecting Km.
    • IFN-gamma treatment led to a 50% reduction in glutaminase protein and a 75% decrease in glutaminase messenger RNA levels.
    • These molecular changes resulted in a 60-80% decrease in functional glutaminase-specific activity.

    Conclusions:

    • IFN-gamma significantly reduces gut mucosal glutaminase activity in vitro.
    • This IFN-gamma-mediated downregulation of glutaminase may represent a key mechanism for diminished gut glutamine metabolism in cancer.
    • This finding contributes to understanding host-cancer metabolic interactions.