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Updated: Jan 29, 2026
Investigating Intestinal Inflammation in DSS-induced Model of IBD
Published on: February 1, 2012
The NLRP3 inflammasome mediates DSS-induced intestinal inflammation in Nod2 knockout mice
Benjamin Umiker1, Hyun-Hee Lee1, Julia Cope2
11 Merck Research Laboratories, Boston, MA, USA.
Abstract:
Crohn's disease (CD) is a chronic disorder of the gastrointestinal tract characterized by inflammation and intestinal epithelial injury. Loss of function mutations in the intracellular bacterial sensor NOD2 are major risk factors for the development of CD. In the absence of robust bacterial recognition by NOD2 an inflammatory cascade is initiated through alternative PRRs leading to CD. In the present study, MCC950, a specific small molecule inhibitor of NLR pyrin domain-containing protein 3 (NLRP3), abrogated dextran sodium sulfate (DSS)-induced intestinal inflammation in Nod2-/- mice. NLRP3 inflammasome formation was observed at a higher rate in NOD2-deficient small intestinal lamina propria cells after insult by DSS. NLRP3 complex formation led to an increase in IL-1β secretion in both the small intestine and colon of Nod2ko mice. This increase in IL-1β secretion in the intestine was attenuated by MCC950 leading to decreased disease severity in Nod2ko mice. Our work suggests that NLRP3 inflammasome activation may be a key driver of intestinal inflammation in the absence of functional NOD2. NLRP3 pathway inhibition can prevent intestinal inflammation in the absence of robust NOD2 signaling.
Insights
In Crohn's disease (CD), impaired NOD2 function leads to inflammation driven by the NLRP3 inflammasome. Inhibiting NLRP3 with MCC950 reduced intestinal inflammation and disease severity in a mouse model lacking functional NOD2.
Area of Science:
- Gastroenterology
- Immunology
- Molecular Biology
Background:
- Crohn's disease (CD) involves gastrointestinal inflammation and epithelial injury.
- Loss-of-function mutations in NOD2 are significant risk factors for CD development.
- NOD2 deficiency can trigger inflammatory cascades via alternative pattern recognition receptors (PRRs).
Purpose of the Study:
- To investigate the role of NLRP3 inflammasome activation in NOD2-deficient mice with DSS-induced intestinal inflammation.
- To evaluate the therapeutic potential of MCC950, an NLRP3 inhibitor, in this disease model.
Main Methods:
- Utilized dextran sodium sulfate (DSS) to induce intestinal inflammation in Nod2 knockout (Nod2ko) mice.
- Administered MCC950, a specific small molecule inhibitor of NLR pyrin domain-containing protein 3 (NLRP3).
- Assessed NLRP3 inflammasome formation, IL-1β secretion, and disease severity in the small intestine and colon.
Main Results:
- MCC950 abrogated DSS-induced intestinal inflammation in Nod2ko mice.
- NLRP3 inflammasome formation and IL-1β secretion were elevated in NOD2-deficient intestinal cells post-DSS.
- MCC950 treatment attenuated IL-1β increase and decreased disease severity in Nod2ko mice.
Conclusions:
- NLRP3 inflammasome activation is a key driver of intestinal inflammation in the absence of functional NOD2.
- Inhibition of the NLRP3 pathway offers a potential therapeutic strategy for preventing intestinal inflammation when NOD2 signaling is impaired.
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