Dexamethasone reduces cell surface levels of CD11b on human eosinophils

Overnight incubation of human eosinophils (Eos) with the glucocorticoid hormone dexamethasone (DEX; 0.1 mu M) resulted in lower expression of the CD11b, but not CD49d, antigen on their plasma membrane, as assessed by flow cytometry, DEX produced a consistent inhibitory effect (ranging from 16% to 20%) when tested at a concentration of 0.1 mu M. Eo stimulation with 100 ng/ml eotaxin produced an increase in CD11b (+26%), but not levels and concomitantly a reduction on CD62L expression, The inhibition exerted by DEX upon CD11b levels was also evident following eotaxin upregulation, with a degree of inhibition similar to that seen on basal levels. These data highlight a novel mechanism of action by which glucocorticoid hormones may be effective in reducing Eo accumulation during allergic inflammation in man.