Sistema FMUSP-HC: Faculdade de Medicina da Universidade de São Paulo (FMUSP) e Hospital das Clínicas da FMUSPGOBBATO, Nathalia BrandaoSOUZA, Flavia Castro Ribas deFUMAGALLI, Stella Bruna NapolitanoLOPES, Fernanda Degobbi Tenorio Quirino dos SantosPRADO, Carla MaximoMARTINS, Milton ArrudaTIBERIO, Iolanda de Fatima Lopes CalvoLEICK, Edna Aparecida2014-01-282014-01-282013BIOMED RESEARCH INTERNATIONAL, article ID 523761, 15p, 20132314-6133https://observatorio.fm.usp.br/handle/OPI/3930Aims. Compare the effects of montelukast or dexamethasone in distal lung parenchyma and airway walls of guinea pigs (GP) with chronic allergic inflammation. Methods. GP have inhaled ovalbumin (OVA group-2x/week/4weeks). After the 4th inhalation, GP were treated with montelukast or dexamethasone. After 72 hours of the 7th inhalation, GP were anesthetised, and lungs were removed and submitted to histopathological evaluation. Results. Montelukast and dexamethasone treatments reduced the number of eosinophils in airway wall and distal lung parenchyma compared to OVA group (P < 0.05). On distal parenchyma, both treatments were effective in reducing RANTES, NF-kappa B, and fibronectin positive cells compared to OVA group (P < 0.001). Montelukast was more effective in reducing eotaxin positive cells on distal parenchyma compared to dexamethasone treatment (P < 0.001), while there was a more expressive reduction of IGF-I positive cells in OVA-D group (P < 0.001). On airway walls, montelukast and dexamethasone were effective in reducing IGF-I, RANTES, and fibronectin positive cells compared to OVA group (P < 0.05). Dexamethasone was more effective in reducing the number of eotaxin and NF-kappa B positive cells than Montelukast (P < 0.05). Conclusions. In this animal model, both treatments were effective in modulating allergic inflammation and remodeling distal lung parenchyma and airway wall, contributing to a better control of the inflammatory response.engopenAccessleukotriene receptor antagonistobstructive pulmonary-diseasenf-kappa-blung-tissue mechanicsmouse asthma modelinhaled corticosteroidsairway inflammationguinea-pigseosinophilic inflammationcysteinyl leukotrienesarticleCopyright HINDAWI PUBLISHING CORPORATION10.1155/2013/523761Biotechnology & Applied MicrobiologyMedicine, Research & Experimental