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Updated: Feb 4, 2026
Investigating Intestinal Inflammation in DSS-induced Model of IBD
Published on: February 1, 2012
Mutual Regulation of TLR/NLR and CEACAM1 in the Intestinal Microvasculature: Implications for IBD Pathogenesis and
Anja Schirbel1,2, Nancy Rebert2, Tammy Sadler2
1Department of Hepatology and Gastroenterology, Charité - Universitätsmedizin Berlin, Campus Mitte, Berlin, Germany.
Background:
Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) displays multiple activities, among which pathogen binding and angiogenesis are particularly prominent. These same functions are also exerted by Toll- and NOD-like receptors (TLRs and NLRs), which are critical mediators of innate immune responses. We investigated whether a functional inter-relationship exists between CEACAM1 and TLRs and NLRs and its potential impact on induction of intestinal angiogenesis.
Methods:
This hypothesis was tested using human intestinal microvascular endothelial cells, a unique cell population exposed to microbial products under physiological and pathological conditions.
Results:
The results show that activation of TLR2/4, TLR4, NOD1, and NOD2 by specific bacterial ligands selectively and differentially upregulates the levels of cellular and soluble CEACAM1 produced by intestinal microvascular endothelial cells. The results also show that CEACAM1 regulates the migration, transmigration, and tube formation of these endothelial cells and mediates vessel sprouting induced by specific TLR and NLR bacterial ligands. Combined, these results demonstrate a close and reciprocal regulatory interaction between CEACAM1 and bacterial products in mediating multiple functions essential to new vessel formation in the gut mucosa.
Conclusions:
A coordinated and reciprocal interaction of CEACAM1 and microbiota-derived factors is necessary to optimize angiogenesis in the gut mucosa. This suggests that a coordination of endogenous and exogenous innate immune responses is necessary to promote intestinal angiogenesis under physiological and inflammatory conditions such as inflammatory bowel disease.
Insights
Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) interacts with Toll-like receptors (TLRs) and NOD-like receptors (NLRs) to regulate intestinal angiogenesis. This coordinated response is crucial for new blood vessel formation in the gut mucosa.
Area of Science:
- Immunology
- Cell Biology
- Gastroenterology
Background:
- Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is involved in pathogen binding and angiogenesis.
- Toll-like receptors (TLRs) and NOD-like receptors (NLRs) are key mediators of innate immunity with similar functions.
- The interplay between CEACAM1 and TLRs/NLRs in intestinal angiogenesis was unexplored.
Purpose of the Study:
- To investigate the functional relationship between CEACAM1 and TLRs/NLRs.
- To determine the impact of this interaction on intestinal angiogenesis.
Main Methods:
- Human intestinal microvascular endothelial cells were utilized.
- Cells were exposed to microbial products to activate TLRs and NLRs.
- CEACAM1 levels and endothelial cell functions were assessed.
Main Results:
- Bacterial ligands for TLR2/4, TLR4, NOD1, and NOD2 upregulated CEACAM1 expression.
- CEACAM1 modulated endothelial cell migration, transmigration, and tube formation.
- CEACAM1 mediated TLR/NLR-induced vessel sprouting.
Conclusions:
- A reciprocal interaction between CEACAM1 and microbiota-derived factors is essential for gut angiogenesis.
- Coordinated innate immune responses involving CEACAM1 and microbial factors promote intestinal angiogenesis.
- This interaction is relevant to physiological conditions and inflammatory diseases like IBD.
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