Prevention of non-specific airway hyperreactivity after allergen challenge in guinea-pigs by the PAF receptor antagonist SDZ 64-412
| Autor: | D.A. Handley, Andrew M. Havill, Ronald G. Van Valen |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Male
Ketotifen Allergy medicine.drug_class Guinea Pigs Bronchi In Vitro Techniques Vagotomy Methylprednisolone chemistry.chemical_compound Hypersensitivity medicine Animals Platelet Activating Factor Pharmacology medicine.diagnostic_test Platelet-activating factor Triazines business.industry Antagonist Vagus Nerve Azepines Allergens Triazoles respiratory system Eosinophil Isoquinolines medicine.disease Receptor antagonist respiratory tract diseases Eosinophils Bronchoalveolar lavage medicine.anatomical_structure chemistry Immunology business Bronchoalveolar Lavage Fluid Histamine Research Article medicine.drug |
| Zdroj: | British Journal of Pharmacology. 99:396-400 |
| ISSN: | 0007-1188 |
| DOI: | 10.1111/j.1476-5381.1990.tb14715.x |
| Popis: | 1. Allergen challenge by aerosol in sensitized guinea-pigs elicited non-specific airway hyperreactivity assessed by reactivity to i.v. histamine or acetylcholine. Airway hyperreactivity to histamine persisted for at least 48 h and was accompanied by pulmonary eosinophilia as determined by bronchoalveolar lavage cell analysis. 2. Airway hyperreactivity was independent of vagal reflex mechanisms since it was not abrogated by bilateral vagotomy. 3. The novel platelet-activating factor (PAF) receptor antagonist SDZ 64-412 inhibited the development of airway hyperreactivity, as measured 24 h after aerosol allergen challenge, when given as a single treatment orally 2 h before allergen challenge. The PAF receptor antagonist WEB 2086 as well as methylprednisolone and ketotifen also showed efficacy in preventing development of airway hyperreactivity. 4. Neither the two PAF antagonists nor ketotifen had any effect on bronchoalveolar lavage (BAL) eosinophil numbers. Methylprednisolone was the only substance which readily prevented eosinophil recruitment in addition to airway hyperreactivity. 5. We conclude that allergen-induced airway hyperreactivity in guinea-pigs is inhibited by prophylactic anti-asthma drugs and specific PAF receptor antagonists, thus demonstrating a pivotal role of PAF in this response. There was a lack of correlation between airway hyperreactivity and the presence of BAL eosinophils. |
| Databáze: | OpenAIRE |
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