VALIDATION OF A NONINVASIVE TECHNIQUE TO ASSESS IMMEDIATE OR DELAYED ONSET OF AIRWAY HYPERSENSITIVITY IN GUINEA-PIGS

被引:50
|
作者
PAULUHN, J
EBEN, A
机构
[1] Bayer AG, Department of Toxicology, Wuppertal, W-5600, Building 514, Friedrich-Ebert-Str. 217
关键词
RESPIRATORY ALLERGY; GUINEA-PIG MODEL; OVALBUMIN; TRIMELLITIC ANHYDRIDE; TRIMERIC HEXAMETHYLENE DIISOCYANATE;
D O I
10.1002/jat.2550110608
中图分类号
R99 [毒物学(毒理学)];
学科分类号
100405 ;
摘要
Conscious Hartley guinea-pigs were sensitized with trimellitic anhydride (TMA) or trimeric hexamethylene diisocyanate biuret (Des-N) by repeated intradermal injections or by inhalation exposure. Immediate- and delayed-onset pulmonary reactions were recorded during/after challenges with the hapten or protein conjugate of the hapten, respectively. The positive control was sensitized and challenged with ovalbumin (OA) by inhalation. Homocytotropic antibodies of the IgG1 type were determined to correlate antibody titres and pulmonary responses. Immediate-onset pulmonary reactions were apparent in guinea-pigs sensitized by inhalation of TMA and OA. Animals sensitized intradermally with TMA demonstrated more vigorous immediate-onset reactions than animals sensitized by inhalation. The measurement of breathing parameters demonstrated that the ability to detect immediate-onset airway hyperreactivity was best when the breathing rate and tidal and minute volumes were measured. None of the measurements for delayed-onset reactions presented conclusive results, since sensitized as well as naive guinea-pig demonstrated a delayed increase of breathing frequency. Antigen-specific IgG1 antibodies were several orders of magnitude higher in intradermally sensitized animals compared with animals sensitized by inhalation. Although Des-N-sensitized guinea-pigs experienced high IgG1-antibody titres, no response of pulmonary hypersensitivity could be elicited after hapten or conjugate challenge. In summary, it would appear that pulmonary hypersensitivity depends on factors other than IgG1 antibody titres. For the screening of chemicals, the dermal induction and inhalation challenge protocol was revealed to be more sensitive than the inhalation induction and inhalation challenge protocol.
引用
收藏
页码:423 / 431
页数:9
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