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During the season of cedar pollen dispersion in 1996, specific IgE and IL-4 levels in serum and nasal mucosa were determined with time in volunteers who have cedar pollen allergy. In comparison with the serum IgE level determined on January 24 as the baseline value, both values determined during and two months after the cedar pollen season decreased significantly. This was further supported by simultaneously changed IL-4 levels, though the rate of change was relatively small. However, the fact that the determination was performed in a year of small amount of dispersed pollen might have influenced the result. Since changes in IgE and IL-4 levels before and after induction for 6 consecutive days during the nondispersion period showed an increasing trend especially in the nasal mucosa. a possibility was suggested that IgE antibody began to be produced on January 24 when a small amount of cedar pollen had already been dispersed. Since IgE levels in the nasal mucosa decreased during the dispersion period and recovered around two months after dispersion, a possible relation of production to consumption was indicated. Though the mucosal IgE and IL-4 levels were determined in a minimal sample of a mucosal abrasion fragment, these values correlated well with serum IgE levels. Thus this method of determination seemed to be of value for future application.

Change of Specific IgE Levels in Serum and Nasal Mucosa during the Cedar Pollen Season in 1996