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Defective IL-1A expression in patients with Crohn's disease is related to attenuated MAP3K4 signaling

C T M van der Pouw Kraan1, J M Baggen, A A van Bodegraven

  • 1VU University Medical Center, Dept. of Molecular Cell Biology & Immunology, Amsterdam, The Netherlands. t.vanderpouwkraan@vumc.nl

Human Immunology
|June 27, 2012
PubMed

Insights

Crohn's disease patients show reduced immune responses to bacterial triggers. A novel defect in Toll-like receptor (TLR) signaling involving MAP3K4 and IL-1A suggests a relative immune deficiency in these patients.

Area of Science:

  • Immunology
  • Gastroenterology
  • Genetics

Background:

  • Crohn's disease (CD) involves aberrant immune responses to bacterial products via Toll-like receptors (TLRs) in susceptible individuals.
  • While NOD2 mutations explain some CD cases, other immune and autophagy genes also contribute.
  • The search for additional TLR-related factors is crucial due to the limited explanation by NOD2 defects.

Purpose of the Study:

  • To identify novel TLR-related disease-causing factors in Crohn's disease.
  • To investigate the LPS response in CD patients lacking major NOD2 mutations.
  • To elucidate the role of specific signaling molecules and cytokines in CD pathogenesis.

Main Methods:

  • Analysis of lipopolysaccharide (LPS) response in peripheral blood mononuclear cells (PBMCs) from CD patients and controls using low-density arrays.
  • Exclusion of CD patients with major NOD2 mutations.
  • Quantification of TLR4 signal transducers and cytokines, including MAP3K4 and IL-1A.
  • Silencing of MAP3K4 using lentiviral shRNA to assess IL-1A dependency.
  • Measurement of GSK3β expression.

Main Results:

  • CD patients exhibited significantly lower LPS-responsive gene transcript levels compared to controls.
  • Interleukin-1 Alpha (IL-1A) expression was markedly reduced (ninefold) in CD patients (p=0.001).
  • MAP3K4 expression was reduced in CD patients, correlating with low IL-1A levels, and IL-1A expression was dependent on MAP3K4.
  • Increased expression of GSK3β, a MAP3K4 inhibitor, was observed in CD patients.

Conclusions:

  • A novel Toll-like receptor signaling defect involving MAP3K4 and IL-1A was identified in Crohn's disease.
  • This defect contributes to a relative immune deficiency in TLR-mediated cytokine production in CD patients.
  • Findings support the hypothesis of impaired immune responses despite significant intestinal inflammation in CD.

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