Evidence for diminished levels of epithelial psoriasin and calprotectin in chronic rhinosinusitis
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Summary
This summary is machine-generated.Levels of S100 proteins, crucial for barrier function, are significantly decreased in the sinonasal epithelium of chronic rhinosinusitis (CRS) patients. This reduction may impair innate immune responses and barrier integrity in the upper airways.
Area Of Science
- Immunology
- Rhinology
- Molecular Biology
Background
- Decreased S100A7 (psoriasin) and S100A8/A9 (calprotectin) mRNA expression is reported in chronic rhinosinusitis (CRS).
- S100 proteins are vital for epithelial barrier function and antimicrobial defense.
Purpose Of The Study
- To investigate alterations in S100 protein expression within the sinonasal cavity of CRS patients.
- To compare S100 protein levels in sinonasal tissues and lavage fluid between CRS patients and healthy controls.
Main Methods
- ELISA was used to quantify S100 protein levels in nasal lavage fluid.
- Immunohistochemical analysis assessed S100 protein expression in sinonasal polyp tissue (CRSwNP) and uncinate tissue (CRSsNP and controls).
Main Results
- S100 protein levels were significantly decreased in nasal lavage fluid from both CRS groups compared to controls.
- Immunohistochemistry revealed reduced S100 protein expression, primarily in the sinonasal epithelial lining.
- Calprotectin levels were elevated in nasal polyp tissue, correlating with neutrophil elastase levels.
Conclusions
- Reduced S100 protein expression in CRS epithelium may compromise innate immunity and barrier function.
- Elevated calprotectin in nasal polyps suggests neutrophil recruitment as a compensatory response.
- Further research is needed to clarify the role of S100 proteins in CRS pathogenesis and susceptibility to infection.