期刊
CLINICAL AND EXPERIMENTAL ALLERGY
卷 36, 期 4, 页码 543-553出版社
WILEY
DOI: 10.1111/j.1365-2222.2006.02456.x
关键词
adhesion molecules; allergy; beta 7; eosinophils; integrins; intestine; lung
资金
- NIAID NIH HHS [R01 AI042242, R01 AI057803, R01 AI45898] Funding Source: Medline
Background Of the numerous adhesion molecules expressed by eosinophils, the alpha 4-integrin has been identified as critically involved in eosinophil trafficking in the lung. Most studies have focused on the role of the alpha 4 beta 1-adhesion complex, but eosinophils also express the alpha 4 beta 7-integrin complex. Objective To investigate the role of alpha 4 beta 7, by assessing its membrane expression on eosinophils from different compartments using allergen-challenged mice and IL-4/IL-5 bi-transgenic mice. In addition, we aim to determine the impact of beta 7-integrin deficiency on eosinophil recruitment to the lungs and intestine in specific experimental allergic models. Results Evaluation of alpha 4 beta 7 expression on bronchoalveolar lavage fluid (BALF) and lung tissue eosinophils revealed a down-regulation of this integrin as eosinophils migrate through the lungs. Indeed eosinophils isolated from the BALF and lung of allergic mice had low expression of the alpha 4 beta 7-complex. While expression of the alpha 4-chain remained unchanged, a significant decrease in beta 7-surface expression was observed. Intestinal eosinophils, isolated from Peyer's patches, also displayed a down-regulation of the alpha 4 beta 7-integrin, albeit only modest. In contrast, circulating eosinophils, isolated from the blood and spleen, expressed high levels of the alpha 4 beta 7-integrin. However, eosinophil trafficking into the lungs of beta 7-integrin-deficient mice was not significantly impaired in response to respiratory allergen challenges. In contrast, beta 7-deficient mice had impaired eosinophil recruitment to the intestine. Conclusion Taken together, these results identify differential expression of the alpha 4 beta 7-integrin on eosinophils and its critical role in regulating eosinophil responses in the intestine.
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