Peer-reviewed veterinary case report
Allergen exposure lowers immune regulator genes in high-IgE beagles
By Maeda, Sadatoshi et al.·Published in Veterinary dermatology·2007·Department of Veterinary Internal Medicine, Japan·View original on PubMed →
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Original publication title: Allergen challenge decreases mRNA expression of regulatory cytokines in whole blood of high-IgE beagles.
Plain-English summary
A group of high-IgE beagles, known to develop skin issues like atopic dermatitis when exposed to allergens, were tested with house dust mites over three days. Owners noticed increased skin irritation and itching during the exposure, particularly on days 2 and 4. Blood tests showed that certain immune markers related to inflammation were lower after the allergen exposure, suggesting that the dogs' immune systems were not responding properly. This study highlights the challenges in managing allergies in these sensitive dogs, indicating a need for further investigation into their immune responses.
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Abstract
The kinetics of cytokine expression was evaluated in whole blood from high-IgE beagles previously sensitized to house dust mites (HDM) and known to develop clinical signs compatible with atopic dermatitis (AD) upon allergen exposure. Six high-IgE beagles were environmentally challenged daily for 3 h on three consecutive days with a HDM solution. Clinical signs were evaluated before, during, and after the conclusion of the challenge (days 0, 2, 4 and 17) and expression analyses of Th2 (IL-4 and IL-13) and regulatory (IL-10 and TGF-beta) cytokine mRNA were undertaken on blood samples at each time point using real-time polymerase chain reaction. Multiple comparison used to detect significant differences in clinical scores and expression levels of cytokine mRNA revealed that the clinical scores on days 2 and 4 were higher than those on days 0 and 17 (P < 0.05) but no temporal differences in the expression levels of IL-4 and IL-13 mRNA. Expression of TGF-beta mRNA was, however, significantly lower on day 4 (P < 0.05) and the expression of IL-10 mRNA on days 4 and 17 was significantly lower than those on days 0 and 2 (P < 0.05). The results indicate that allergen challenge decreases mRNA expression of regulatory cytokines in whole blood without enhanced mRNA expression of Th2 cytokines and suggest aberrant regulatory T-cell function in the immunopathogenesis of AD in high-IgE beagles.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/17991159/