Targeted inhibition of Gq signaling induces airway relaxation in mouse models of asthma

Matthey, Michaela and Roberts, Richard and Seidinger, Alexander and Simon, Annika and Schröder, Ralf and Kuschak, Markus and Annala, Suvi and König, Gabriele M. and Müller, Christa E. and Hall, Ian P. and Kostenis, Evi and Wenzel, Daniela (2017) Targeted inhibition of Gq signaling induces airway relaxation in mouse models of asthma. Science Translational Medicine, 9 (407). ISSN 1946-6242

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Abstract

Obstructive lung diseases are common causes of disability and death worldwide. A hallmark feature is aberrant activation of Gq protein–dependent signaling cascades. Currently, drugs targeting single G protein (heterotrimeric guanine nucleotide–binding protein)–coupled receptors (GPCRs) are used to reduce airway tone. However, therapeutic efficacy is often limited, because various GPCRs contribute to bronchoconstriction, and chronic exposure to receptor-activating medications results in desensitization. We therefore hypothesized that pharmacological Gq inhibition could serve as a central mechanism to achieve efficient therapeutic bronchorelaxation. We found that the compound FR900359 (FR), a membrane-permeable inhibitor of Gq, was effective in silencing Gq signaling in murine and human airway smooth muscle cells. Moreover, FR both prevented bronchoconstrictor responses and triggered sustained airway relaxation in mouse, pig, and human airway tissue ex vivo. Inhalation of FR in healthy wild-type mice resulted in high local concentrations of the compound in the lungs and prevented airway constriction without acute effects on blood pressure and heart rate. FR administration also protected against airway hyperreactivity in murine models of allergen sensitization using ovalbumin and house dust mite as allergens. Our findings establish FR as a selective Gq inhibitor when applied locally to the airways of mice in vivo and suggest that pharmacological blockade of Gq proteins may be a useful therapeutic strategy to achieve bronchorelaxation in asthmatic lung disease.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Respiratory Medicine
University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Life Sciences
Identification Number: 10.1126/scitranslmed.aag2288
Depositing User: Eprints, Support
Date Deposited: 21 Sep 2017 11:09
Last Modified: 14 Oct 2017 08:49
URI: http://eprints.nottingham.ac.uk/id/eprint/46589

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