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Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
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Bacteria and spontaneous experimental colitis: immunological changes.

Elisabet Pedrosa1, Violeta Lorén, Eduard Cabré

  • 1Health Sciences Research Institute, Germans Trias i Pujol, Badalona, Spain.

European Journal of Clinical Investigation
|September 10, 2011
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Summary

Interleukin-10 (IL-10) deficient mice develop more severe colitis in conventional environments. Increased Toll-like receptor 2 (TLR2) expression in specific pathogen-free (SPF) conditions may offer protection against colitis in these mice.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Microbiology

Background:

  • Intestinal commensal flora is crucial for both human and experimental intestinal inflammation.
  • Interleukin-10 (IL-10) deficient mice are susceptible to intestinal inflammation.
  • Environmental conditions influence the development of colitis.

Purpose of the Study:

  • To investigate the immunological changes in the colon of IL-10 deficient mice.
  • To assess the impact of environmental conditions (specific pathogen-free vs. conventional) on colitis development in IL-10 deficient mice.

Main Methods:

  • Comparison of wild-type (WT) and IL-10(-/-) mice housed in specific pathogen-free (SPF) or conventional environments.
  • Assessment of colitis incidence and severity.
  • Flow cytometry analysis of intraepithelial (IEL) and lamina propria (LPL) lymphocytes.
  • Real-time PCR and immunohistochemistry for Toll-like receptors (TLR2, TLR9) and MyD88 expression.

Main Results:

  • IL-10(-/-) mice in conventional environments exhibited higher incidence and severity of colitis compared to SPF conditions.
  • CD3+ IEL numbers were higher with lower apoptosis rates in IL-10(-/-) mice, irrespective of environment.
  • Differences in LPL lymphocytes were observed only in conventional conditions.
  • TLR2 expression was elevated in SPF-housed IL-10(-/-) mice, but TLR2 and MyD88 were reduced in damaged areas.

Conclusions:

  • In SPF conditions, increased epithelial TLR2 expression may compensate for IL-10 deficiency, mitigating colonic damage.
  • Conventional environments can overwhelm this compensatory mechanism in IL-10 deficient mice, leading to more severe colitis and LPL immune cell activation.