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Eur J Pharmacol. 2019 Jan 15;843:251-259. doi: 10.1016/j.ejphar.2018.11.029. Epub 2018 Nov 24.

Cannabidiol reduces airway inflammation and fibrosis in experimental allergic asthma.

Author information

1
Laboratory of Experimental Pathophysiology, Extreme University South of Santa Catarina, Criciúma, Brazil.
2
Laboratory of Pulmonary Investigation, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
3
Department of Neuroscience and Behavior, Faculty of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil.
4
Department of Pneumology, Asthma Research Centre, Federal University of Santa Catarina, Florianópolis, Brazil.
5
Laboratory of Experimental Pathophysiology, Extreme University South of Santa Catarina, Criciúma, Brazil; Department of Pneumology, Asthma Research Centre, Federal University of Santa Catarina, Florianópolis, Brazil. Electronic address: piz@unesc.net.

Abstract

Asthma is characterized by chronic lung inflammation and airway hyperresponsiveness. Asthma remains a major public health problem and, at present, there are no effective interventions capable of reversing airway remodelling. Cannabidiol (CBD) is known to exert immunomodulatory effects through the activation of cannabinoid-1 and - 2 (CB1 and CB2) receptors located in the central nervous system and immune cells, respectively. However, as the role of CBD on airway remodelling and the mechanisms of CB1 and CB2 aren't fully elucidated, this study was designed to evaluate the effects of cannabidiol in this scenario. Allergic asthma was induced in Balb/c mice exposed to ovalbumin, and respiratory mechanics, collagen fibre content in airway and alveolar septa, cytokine levels, and CB1 and CB2 expression were determined. Moreover, expressions of CB1 and CB2 in induced sputum of asthmatic individuals and their correlation with airway inflammation and lung function were also evaluated. CBD treatment, regardless of dosage, decreased airway hyperresponsiveness, whereas static lung elastance only reduced with high dose. These outcomes were accompanied by decreases in collagen fibre content in both airway and alveolar septa and the expression of markers associated with inflammation in the bronchoalveolar lavage fluid and lung homogenate. There was a significant and inverse correlation between CB1 levels and lung function in asthmatic patients. CBD treatment decreased the inflammatory and remodelling processes in the model of allergic asthma. The mechanisms of action appear to be mediated by CB1/CB2 signalling, but these receptors may act differently on lung inflammation and remodelling.

KEYWORDS:

Asthma; CB(1); CB(2); Cannabidiol; Inflammation; Remodelling

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