Akram Davoodi1, Ramin Lotfi2, Seyed Hamidreza Mortazavi3, Ali Gorgin Karaji4, Alireza Rezaiemanesh4, Farhad Salari4. 1. Student Research Committee, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran. 2. Lung Diseases and Allergy Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran. 3. Department of Pediatrics, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran. 4. Department of Immunology, School of Medicine, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Abstract
BACKGROUND: Retinoic acid (RA) plays a key role in naïve T cell differentiation into FOXP3+ Treg cell in the respiratory airways. The present study aims to investigate RA and Treg-related cytokine serum levels, salivary IgA levels, FOXP3 and IL-4 gene expression, and the relationships between RA serum levels and Treg-related cytokines in allergic rhinitis (AR) patients and healthy controls. METHODS: Salivary IgA and serum IgE, RA, IL-10, and TGF-β concentrations were measured by ELISA in 37 AR patients and 30 age- and sex-matched healthy controls. RESULTS: IL-10 and TGF-β concentrations were significantly less in AR patients than in healthy controls (p< 0.01 and P< 0.0001, respectively). Salivary IgA was significantly greater in patients than in controls (p< 0.05). RA was not significantly different between patients and controls (p> 0.05); however, a significant positive correlation was found between serum RA and both IL-10 and TGF-β in AR patients. CONCLUSION: Our data suggest that RA may influence AR risk via affecting the TGF-β and IL-10 production.
BACKGROUND: Retinoic acid (RA) plays a key role in naïve T cell differentiation into FOXP3+ Treg cell in the respiratory airways. The present study aims to investigate RA and Treg-related cytokine serum levels, salivary IgA levels, FOXP3 and IL-4 gene expression, and the relationships between RA serum levels and Treg-related cytokines in allergic rhinitis (AR) patients and healthy controls. METHODS: Salivary IgA and serum IgE, RA, IL-10, and TGF-β concentrations were measured by ELISA in 37 AR patients and 30 age- and sex-matched healthy controls. RESULTS: IL-10 and TGF-β concentrations were significantly less in AR patients than in healthy controls (p< 0.01 and P< 0.0001, respectively). Salivary IgA was significantly greater in patients than in controls (p< 0.05). RA was not significantly different between patients and controls (p> 0.05); however, a significant positive correlation was found between serum RA and both IL-10 and TGF-β in AR patients. CONCLUSION: Our data suggest that RA may influence AR risk via affecting the TGF-β and IL-10 production.