Differential regulation of eosinophil adhesion and transmigration by pulmonary microvascular endothelial cells.

In bronchial asthma, eosinophils (EOS) adhere to, and migrate across, the lung microvasculature to exert their effector functions in the airways. This study was conducted to determine the effect of cytokines on adhesion molecule expression on human pulmonary microvascular endothelial cells (HPMEC) and the influence of these molecules on EOS adhesion and transmigration in vitro. Unlike ICAM-1 expression (>80% positive cytokine-treated HPMEC by flow cytometry), VCAM-1 expression varied with the cytokine(s) pretreatment; the order of potency was: TNF-alpha + IL-4 (82.2 +/- 4.2% positive cells) > TNF-alpha (41.8 +/- 5.1%) > IL-1beta (20.8 +/- 4.7%). IL-4 alone had no effect on either ICAM-1 or VCAM-1 expression. EOS adhesion to cytokine-treated HPMEC followed the same order as that observed for VCAM-1 expression. Interestingly, EOS migration across cytokine-treated HPMEC varied inversely with VCAM-1 expression on, and EOS adhesion to, HPMEC; IL-1beta (21.2 +/- 1.4% migration) > TNF-alpha (12.6 +/- 2.6%) > TNF-alpha + IL-4 (9.1 +/- 2.0%). EOS adhesion was greatest with TNF-alpha + IL-4-treated HPMEC, was dependent on VCAM-1, and inhibited with anti-alpha4 integrin mAb (67.7 +/- 7.5% inhibition, p < 0.0005). In contrast, the highest EOS migration occurred across IL-1beta-treated HPMEC and was inhibited by anti-beta2 integrin mAb (40.4 +/- 2.5% inhibition, p < 0.005). Viable HPMEC were required for EOS migration but not adhesion. Our results suggest that EOS adhesion and transmigration are differentially regulated by VCAM-1 and ICAM-1 expression and the interaction of these adhesion proteins with their respective counterligands, i.e., alpha4 and beta2 integrins on EOS.

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