The influx of inflammatory cells into nasal washings during the late response to antigen challenge. Effect of systemic XXXX pretreatment.

@entity2023 @entity229 @entity134 @entity56 @entity112 @entity230 @entity17703
Previous studies have demonstrated symptoms and mediator release occurring as long as 11 h after nasal challenge with antigen in selected @entity56 subjects. Pretreatment with systemic @entity230 reduced symptoms and mediators including @entity112 , @entity17703 -esterase activity, and kinins. The aims of the present study were to characterize the cell influx during the late-phase response to antigen challenge and to determine the effect of pretreatment with systemic @entity230 on this response. We examined cytospin slides of nasal washings obtained before and hourly for 11 h after nasal antigen challenge in 10 asymptomatic @entity56 subjects with a history of @entity2023 and 5 normal, nonallergic subjects. Allergic subjects received oral @entity229 (20 mg 3 times a day) or placebo in a random, double-blind crossover manner for 2 days before each of 2 challenges 1 month apart. On placebo days, a mixed cell influx occurred in @entity56 subjects during the late response that was 50-fold greater than the cell influx in the nonallergic control subjects (p less than 0.005). During the first 3 h after antigen challenge, eosinophils (p less than 0.005), but not neutrophils or mononuclear cells, were observed. During the late phase (4 to 11 h), neutrophils, eosinophils, and mononuclear cells were all increased. Oral @entity134 pretreatment blocked the influx of eosinophils (p less than 0.005), but not that of other cells. These data demonstrate an inflammatory cell influx associated with the nasal late-phase response and suggest an important pathogenetic role for the eosinophil.(ABSTRACT TRUNCATED AT 250 WORDS)
