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Immune dysfunction in patients with functional gastrointestinal disorders.

S Kindt1, L Van Oudenhove, D Broekaert

  • 1Department of Gastroenterological Research, KU Leuven, Leuven, Belgium.

Neurogastroenterology and Motility
|January 8, 2009
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Summary

Functional gastrointestinal disorders (FGIDs) show altered immune responses, with a shift towards Th2 cytokines. Acute onset FGIDs exhibit distinct immune profiles compared to unspecified onset, suggesting potential therapeutic targets.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Growing evidence links immune system dysregulation to functional gastrointestinal disorders (FGIDs).
  • FGIDs can arise after infections, with genetic predispositions affecting cytokine production and immune cell presence.

Purpose of the Study:

  • To compare cellular and humoral immune responses in FGID patients versus healthy controls.
  • To differentiate immune responses between acute and unspecified onset FGIDs.

Main Methods:

  • Assessed cytokine production (IL-5, IL-10, IL-13, IFN-gamma, IL-12, TNF-alpha) from stimulated lymphocytes and monocytes.
  • Measured serum IL-6 and IL-10.
  • Utilized fluorescent-activated cell sorting for immunophenotyping.
  • Compared findings between controls, IBS, FD, NCCP, and analyzed acute vs. unspecified onset FGIDs.

Main Results:

  • FGID patients (IBS, FD, NCCP) showed enhanced stimulated lymphocyte IL-5 and IL-13 expression compared to controls.
  • Reduced stimulated monocytic IL-12 and lymphocytic IL-10 expression were observed in IBS and FD.
  • FD patients also had reduced IFN-gamma expression.
  • Acute onset FGIDs had higher serum IL-10 and increased CD3(+)CD45RA(+)CD45RO(+) cells.
  • FD patients with acute onset showed higher LPS-stimulated TNF-alpha.

Conclusions:

  • FGIDs exhibit a shift towards a Th2 cytokine profile.
  • Cellular immunophenotypes in FGIDs remain largely unchanged.
  • Distinct immune profiles in acute onset FGIDs warrant further investigation for novel therapeutic strategies.