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Secretory mediators regulate Nod2-induced tolerance in human macrophages
1Department of Medicine, Section of Digestive Diseases, Yale University, New Haven, Connecticut, USA.
Gastroenterology
|September 22, 2010
Summary
Nucleotide oligomerization domain 2 (Nod2) stimulation induces tolerance by down-regulating inflammatory cytokines. Secretory mediators and the mTOR pathway are key mechanisms for this Nod2-mediated tolerance, crucial for intestinal homeostasis.
Area of Science:
- Immunology
- Molecular Biology
- Gastroenterology
Background:
- Nucleotide oligomerization domain 2 (Nod2) polymorphisms are linked to Crohn's disease risk.
- Chronic Nod2 stimulation by bacterial products in the intestine may induce tolerance.
- Mechanisms of Nod2-mediated cytokine down-regulation are not fully understood.
Purpose of the Study:
- Investigate secretory mediators as a mechanism for Nod2-mediated tolerance.
- Identify signaling pathways involved in Nod2 tolerance.
- Elucidate the role of Nod2 in maintaining intestinal homeostasis.
Main Methods:
- Primary human macrophages were used to study Nod2-mediated tolerance.
- Secretory mediator function was inhibited to assess tolerance reversal.
- Cytokine secretion was measured to quantify tolerance.
- Pathway inhibition was employed to identify signaling mechanisms.
Main Results:
- Chronic Nod2 stimulation induced cross-tolerance to Toll-like receptors (TLRs) and IL-1 receptor.
- Interleukin-1 beta (IL-1β) blockade partially reversed Nod2-mediated tolerance.
- Early secretion of IL-10, TGF-β, and IL-1Ra mediated Nod2 tolerance.
- The mammalian target of rapamycin (mTOR) pathway was critical for Nod2-induced anti-inflammatory responses and tolerance.
Conclusions:
- Chronic Nod2 stimulation down-regulates inflammatory responses via the IL-1R.
- Secretory mediators are essential for Nod2-mediated cytokine down-regulation.
- The mTOR pathway plays a crucial role in Nod2-mediated tolerance, contributing to intestinal homeostasis.
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