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MicroRNAs as Key Modulators of Intestinal Barrier Function: Pattern Recognition Receptors, Epithelial Junctional
Rezzan Sevim1, Songül Erhan2, Erdal Matur3
1Institute of Graduate Studies, Istanbul University-Cerrahpasa, Istanbul, Turkey.
Purpose:
This review aims to investigate the regulatory role of microRNAs (miRNAs) in intestinal barrier function, with a focus on their interaction with pattern recognition receptors (PRRs) such as Toll-like receptors (TLR2, TLR4, TLR5) and nucleotide-binding oligomerization domain (NOD) receptors. Additionally, the review explores how miRNAs influence epithelial junctional complexes-including tight junctions, adherens junctions, and desmosomes-and their implications in inflammatory bowel diseases (IBD).
Methods:
A comprehensive literature review was conducted to examine recent studies focusing on miRNA-mediated modulation of signaling pathways related to PRRs and junctional complexes. Particular attention was given to the expression and regulation of key junctional complexes such as claudin, occludin, and zonula occludens, and their relationship with epithelial homeostasis.
Results:
Emerging evidence demonstrates that miRNAs modulate both inflammatory signaling and structural junctional integrity. Dysregulated expression of specific miRNAs is associated with impaired barrier function and increased intestinal permeability, contributing to the pathogenesis of IBD. Moreover, experimental data suggest that miRNA mimics and antagomiRs may help restore epithelial barrier integrity and reduce inflammation.
Conclusion:
MiRNAs play a central role in maintaining intestinal barrier homeostasis by targeting PRRs and junctional complexes. Their ability to modulate inflammation and barrier function highlights their potential as therapeutic targets. miRNA-based strategies may offer novel, targeted treatments for IBD and other intestinal disorders.
Insights
MicroRNAs (miRNAs) regulate intestinal barrier function by interacting with pattern recognition receptors (PRRs) and junctional complexes. Dysregulation contributes to inflammatory bowel diseases (IBD), suggesting miRNA-based therapies for gut disorders.
Area of Science:
- Gastroenterology and Molecular Biology
- Immunology and Cell Biology
Background:
- Intestinal barrier integrity is crucial for preventing pathogen entry and maintaining homeostasis.
- MicroRNAs (miRNAs) are key regulators of gene expression involved in cellular processes.
- Pattern recognition receptors (PRRs) and epithelial junctional complexes are vital components of the intestinal barrier.
Purpose of the Study:
- To review the regulatory role of miRNAs in intestinal barrier function.
- To investigate miRNA interactions with PRRs (e.g., TLRs, NODs) and junctional complexes (tight junctions, adherens junctions, desmosomes).
- To explore the implications of these interactions in inflammatory bowel diseases (IBD).
Main Methods:
- Comprehensive literature review of recent studies.
- Focus on miRNA-mediated modulation of PRR and junctional complex signaling pathways.
- Analysis of miRNA regulation of key junctional proteins (claudin, occludin, ZO-1) and epithelial homeostasis.
Main Results:
- miRNAs modulate both inflammatory signaling and structural integrity of the intestinal barrier.
- Dysregulated miRNA expression is linked to impaired barrier function and increased permeability in IBD.
- Specific miRNAs influence the expression and function of claudins, occludins, and zonula occludens.
Conclusions:
- miRNAs are central to maintaining intestinal barrier homeostasis by targeting PRRs and junctional complexes.
- miRNAs' role in modulating inflammation and barrier function presents therapeutic potential.
- miRNA-based strategies offer promising novel treatments for IBD and related intestinal disorders.
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