Steroids and beta2-agonists regulate hyaluronan metabolism in asthmatic airway smooth muscle cells

Papakonstantinou, E. and Klagas, I. and Karakiulakis, G. and Hostettler, K. and S'Ng C, T. and Kotoula, V. and Savic, S. and Tamm, M. and Roth, M.. (2012) Steroids and beta2-agonists regulate hyaluronan metabolism in asthmatic airway smooth muscle cells. American journal of respiratory cell and molecular biology, Vol. 47, No. 6. pp. 759-767.

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Official URL: http://edoc.unibas.ch/dok/A6338174

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Glycosaminoglycans (GAGs), especially hyaluronic acid (HA), regulate tissue flexibility, cell motility, and inflammation. Airway smooth muscle cells (ASMCs) of patients with asthma exhibit abnormal HA metabolism, which contributes to inflammation and remodeling. Here, we investigated the effects of glucocorticoids and long-acting beta(2)-agonists (LABAs) on GAG synthesis and HA metabolism by human primary ASMCs. ASMCs were isolated from airway specimens of 10 patients without asthma and 11 patients with asthma. ASMCs were incubated with glucocorticoids, LABAs, or their combination, as well as with their specific receptor antagonists. Secreted and deposited total GAGs were measured by [(3)H]-glucosamine incorporation. The expression of specific GAGs was determined by ELISA and electrophoresis. The expression of HA synthases (HAS), of hyaluronidases (HYALs), and of the HA receptor CD44 was determined by RT-PCR, immunoblotting in cell cultures, and immunohistochemistry in tissue sections of asthmatic lungs. In serum-activated asthmatic ASMCs, glucocorticoids and LABAs significantly inhibited the increased secretion and deposition of total GAGs, but they stimulated secreted and deposited HA of high molecular mass. This effect was attributed to increased mRNA and protein expression of HAS-1 and to the reduced expression of HYAL-1. Furthermore, drug treatment stimulated the expression of CD44 receptors in asthmatic ASMCs. These effects of the drugs were eliminated by their respective receptor inhibitors. Our findings indicate that the combination of glucocorticoids with LABAs counteracts the pathologic degradation of HA, and thereby may reduce the proinflammatory potential of asthmatic ASMCs.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Pulmonary Cell Research (Roth/Tamm)
UniBasel Contributors:Tamm, Michael and Roth-Chiarello, Michael
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Thoracic Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2015 09:13
Deposited On:10 Apr 2015 09:13

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