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Am. J. Respir. Crit. Care Med., Vol 155, No. 3, 03 1997, 839-844.

Role of IgE in hyperresponsiveness induced by passive sensitization of human airways

N Watson, K Bodtke, RA Coleman, G Dent, BE Morton, E Ruhlmann, H Magnussen and KF Rabe
Krankenhaus Grosshansdorf, Zentrum fur Pneumologie und Thoraxchirurgie, Grosshansdorf Germany.

Incubation of airways from nonatopic patients with serum from patients with high IgE levels confers responsiveness to "specific" (allergen) and hyperresponsiveness to "nonspecific" (histamine) stimuli. We have tested the hypothesis that the level of IgE determines the degree of specific and nonspecific responsiveness. Bronchial rings from nonatopic patients were sensitized overnight with serum containing high levels of allergen-specific IgE, or with an allergen-specific chimeric IgE (JW8) in physiologic buffer. In vitro responsiveness to allergen and histamine was evaluated and compared with non-sensitized tissues from the same patients. Responses to specific allergen were demonstrated in all tissues sensitized with atopic serum or chimeric IgE, but not in nonsensitized tissues. Allergen responses were specific, since tissues sensitized using serum containing high Dermatohagoides farinae-specific IgE only, did not respond to either horse or dog allergens. The potency and magnitude of the maximal contraction to histamine was significantly (p < 0.05) increased in tissues sensitized using atopic serum with high total IgE concentrations compared with nonsensitized preparations, but was unchanged in tissues sensitized using chimeric IgE or serum with low total IgE levels. Therefore, specific IgE determines allergen responsiveness in passively sensitized human airways, but histamine hyperresponsiveness is independent of specific IgE and appears to be related to some other factor associated with serum containing high concentrations of total IgE.


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Copyright © 1997 American Thoracic Society