Rho-kinase inhibition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic inflammation

Rho-kinase inhibition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic inflammation

Author Possa, Samantha Souza Google Scholar
Charafeddine, Homar Toledo Google Scholar
Righetti, Renato Fraga Google Scholar
Silva, Patricia Angeli da Google Scholar
Almeida-Reis, Rafael Google Scholar
Saraiva-Romanholo, Beatriz Mangueira Google Scholar
Perini, Adenir Google Scholar
Prado, Carla Maximo Autor UNIFESP Google Scholar
Leick-Maldonado, Edna Aparecida Google Scholar
Martins, Milton A. Google Scholar
Lopes Calvo Tiberio, Iolanda de Fatima Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Possa SS, Charafeddine HT, Righetti RF, da Silva PA, Almeida-Reis R, Saraiva-Romanholo BM, Perini A, Prado CM, Leick-Maldonado EA, Martins MA, Tiberio ID. Rho-kinase inhibition attenuates airway responsiveness, inflammation, matrix remodeling, and oxidative stress activation induced by chronic inflammation. Am J Physiol Lung Cell Mol Physiol 303: L939-L952, 2012. First published September 21, 2012; doi:10.1152/ajplung.00034.2012.-Several studies have demonstrated the importance of Rho-kinase in the modulation of smooth muscle contraction, airway hyperresponsiveness, and inflammation. However, the effects of repeated treatment with a specific inhibitor of this pathway have not been previously investigated. We evaluated the effects of repeated treatment with Y-27632, a highly selective Rho-kinase inhibitor, on airway hyperresponsiveness, oxidative stress activation, extracellular matrix remodeling, eosinophilic inflammation, and cytokine expression in an animal model of chronic airway inflammation. Guinea pigs were subjected to seven ovalbumin or saline exposures. the treatment with Y-27632 (1 mM) started at the fifth inhalation. Seventy-two hours after the seventh inhalation, the animals' pulmonary mechanics were evaluated, and exhaled nitric oxide (E-NO) was collected. the lungs were removed, and histological analysis was performed using morphometry. Treatment with Y-27632 in sensitized animals reduced E-NO concentrations, maximal responses of resistance, elastance of the respiratory system, eosinophil counts, collagen and elastic fiber contents, the numbers of cells positive for IL-2, IL-4, IL-5, IL-13, inducible nitric oxide synthase, matrix metalloproteinase-9, tissue inhibitor of metalloproteinase-1, transforming growth factor-beta, NF-kappa B, IFN-gamma, and 8-iso-prostaglandin F2 alpha contents compared with the untreated group (P < 0.05). We observed positive correlations among the functional responses and inflammation, remodeling, and oxidative stress pathway activation markers evaluated. in conclusion, Rho-kinase pathway activation contributes to the potentiation of the hyperresponsiveness, inflammation, the extracellular matrix remodeling process, and oxidative stress activation. These results suggest that Rho-kinase inhibitors represent potential pharmacological tools for the control of asthma.
Keywords asthma
guinea pigs
Rho-associated kinases
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Date 2012-12-01
Published in American Journal of Physiology-lung Cellular and Molecular Physiology. Bethesda: Amer Physiological Soc, v. 303, n. 11, p. L939-L952, 2012.
ISSN 1040-0605 (Sherpa/Romeo, impact factor)
Publisher Amer Physiological Soc
Extent L939-L952
Origin http://dx.doi.org/10.1152/ajplung.00034.2012
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000311905600001
URI http://repositorio.unifesp.br/handle/11600/35529

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