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Decreased lamina propria effector cell responsiveness to interleukin-10 in ileal Crohn's disease
Stefaan Colpaert1, Kathleen Vanstraelen, Zhanju Liu
1Laboratory of Experimental Immunology, University Hospital and Katholieke Universiteit Leuven, Leuven, Belgium.
Insights
Interleukin-10 (IL-10) does not appear deficient in Crohn's disease. Instead, IL-10 showed poor anti-inflammatory effects and potential pro-inflammatory actions in Crohn's disease tissues.
Area of Science:
- Immunology
- Gastroenterology
Background:
- Crohn's disease pathogenesis is complex.
- The role of Interleukin-10 (IL-10) in Crohn's disease remains unclear.
- Investigating IL-10 production and responsiveness is crucial for understanding disease mechanisms.
Purpose of the Study:
- To determine if reduced IL-10 production or responsiveness contributes to Crohn's disease.
- To assess the efficacy of IL-10 in modulating inflammatory responses in Crohn's disease.
Main Methods:
- Isolation of lamina propria mononuclear cells from Crohn's disease patients and controls.
- Activation of cells with anti-CD3 mAb, CD80 transfectants, or LPS +/- IFN-gamma.
- Evaluation of IL-10 production and the effects of recombinant human IL-10 (rhIL-10) and anti-IL-10R mAb on cytokine production (IFN-gamma, TNF).
Main Results:
- No evidence of deficient IL-10 production by T cells or macrophages in Crohn's disease.
- rhIL-10 demonstrated poor efficacy in down-regulating IFN-gamma and TNF production.
- Anti-IL-10R mAb suggested potential pro-inflammatory effects of IL-10 in Crohn's disease tissues.
- IL-12 activity may counteract IL-10 effects.
Conclusions:
- IL-10 exhibits poor anti-inflammatory and potential pro-inflammatory effects on ileal Crohn's disease lamina propria.
- These findings may explain the limited therapeutic success of IL-10 in Crohn's disease patients.
- Dysfunctional IL-10 signaling, rather than deficiency, could be implicated in Crohn's disease.
Abstract:
We investigated whether a lack of IL-10 production or responsiveness could be involved in Crohn's disease pathogenesis. Lamina propria mononuclear cells, isolated from the ilea of Crohn's disease patients (n = 16) and controls (n = 13), were activated with anti-CD3 mAb in the presence of CD80 transfectants or LPS +/- IFN-gamma. No evidence for deficient IL-10 production by either T cells or macrophages in Crohn's disease was found. However, the efficacy of rhIL-10 to down-regulate IFN-gamma and especially TNF production in cell cultures from the involved tissues of Crohn's disease patients was poor, and the use of an anti-IL-10R mAb even provided evidence for proinflammatory effects of IL-10. This lack of IL-10 effect possibly results from IL-12 activity. We conclude that IL-10 exhibits poor anti- and even potential proinflammatory effects on ileal Crohn's disease lamina propria. These data might explain the lack of therapeutic efficacy when IL-10 is given to Crohn's disease patients.