Abstract
Eosinophils accumulate at sites of allergic inflammation, and play important roles in asthma/allergic disorders. The mechanism of eosinophil recruitment into tissues is not fully understood. In this study, we evaluated whether adhesion and/or transmigration, in the presence of IL-5 and eotaxin, alter the expression of CD9, CD11b, the β1α4-integrin, and the EG2-epitope on intracellular ECP. We also investigated whether CD9 is involved in the adhesion process. With flow cytometry the surface expression of CD9, CD11b and the β1α4-integrin, and the intracellular expression of EG2, were analyzed before, and after transmigration/adhesion to fibronectin. To evaluate the eventual role of CD9 in adhesion, eosinophils were preincubated with monoclonal antibodies to CD9. We observed decreased expression of CD9, and increased expression of CD11b on eosinophils, after adhesion and transmigration. The transmigration did not change the expression of the β1α4-integrin or EG2, whereas the adhesion resulted in a decreased EG2 expression. Antibodies to CD9 decreased the adhesion property of eosinophils. The eosinophils are activated after both adhesion and transmigration by means of decreased CD9 and increased CD11b expression. The expression of the EG2-epitope on intracellular ECP was decreased when eosinophils adhered to fibronectin, probably due to degranulation. Our results also indicate that CD9 is involved in the adhesion of eosinophils to fibronectin.
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Fernvik, E., Lundahl, J. & Halldén, G. The Impact of Eotaxin- and IL-5-Induced Adhesion and Transmigration on Eosinophil Activity Markers. Inflammation 24, 73–87 (2000). https://doi.org/10.1023/A:1006940109869
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DOI: https://doi.org/10.1023/A:1006940109869