Plasma interleukin-8 (IL-8) concentrations were measured in patients with atopic dermatitis. Plasma IL-8 was not detected in 25 controls (0/25), in allergic rhinitis (0/20), or in bronchial asthma during remission (0/13), while low concentrations of IL-8 were detectable in a few patients with urticaria (1/19), contact dermatitis (4/17), and bronchial asthma at the time of attack (6/16). In contrast, IL-8 was detectable in most cases of atopic dermatitis (41/52). Moreover, IL-8 concentrations were significantly higher in severe than in mild or moderate atopic dermatitis. IL-8 concentrations decreased as atopic dermatitis was improved by treatment, and IgE production in vitro was also decreased while serum IgE concentrations remained unchanged. IL-8 measurement may be a useful tool for the study of the pathogenesis and clinical course of atopic dermatitis.
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