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Nongenomic effects of fluticasone propionate and budesonide on human airway anion secretion.
- Source :
-
American journal of respiratory cell and molecular biology [Am J Respir Cell Mol Biol] 2012 Nov; Vol. 47 (5), pp. 645-51. Date of Electronic Publication: 2012 Jul 12. - Publication Year :
- 2012
-
Abstract
- This study investigated the physiological effects of inhaled corticosteroids, which are used widely to treat asthma. The application of fluticasone propionate (FP, 100 μM) induced sustained increases in the short-circuit current (I(SC)) in human airway Calu-3 epithelial cells. The FP-induced I(SC) was prevented by the presence of H89 (10 μM, a protein kinase A inhibitor) and SQ22536 (100 μM, an adenylate cyclase inhibitor). The FP-induced responses involved bumetanide (a Na(+)-K(+)-2Cl(-) cotransporter inhibitor)-sensitive and 4,4'-dinitrostilbene-2,2'-disulfonic acid (an inhibitor of HCO(3)(-)-dependent anion transporters)-sensitive components, both of which reflect basolateral anion transport. Further, FP augmented apical membrane Cl(-) current (I(Cl)), reflecting cystic fibrosis transmembrane conductance regulator (CFTR)-mediated conductance, in the nystatin-permeabilized monolayer. In I(SC) and I(Cl) responses, FP failed to enhance the responses to forskolin (10 μM, an adenylate cyclase activator). Nevertheless, we found that FP synergistically increased cytosolic cAMP concentrations in combination with forskolin. All these effects of FP were reproduced with the use of budesonide. Collectively, inhaled corticosteroids such as FP and budesonide stimulate CFTR-mediated anion transport through adenylate cyclase-mediated mechanisms in a nongenomic fashion, thus sharing elements of a common pathway with forskolin. However, the corticosteroids cooperate with forskolin for synergistic cAMP production, suggesting that the corticosteroids and forskolin do not compete with each other to exert their effects on adenylate cyclase. Considering that such synergism was also observed in the FP/salmeterol combination, these nongenomic aspects may play therapeutic roles in mucus congestive airway diseases, in addition to genomic aspects that are generally recognized.
- Subjects :
- Administration, Inhalation
Adrenal Cortex Hormones administration & dosage
Androstadienes pharmacology
Anion Transport Proteins metabolism
Budesonide administration & dosage
Cell Line
Colforsin pharmacology
Cyclic AMP metabolism
Epithelial Cells drug effects
Fluticasone
Humans
Membrane Potentials drug effects
Second Messenger Systems drug effects
Adrenal Cortex Hormones pharmacology
Androstadienes administration & dosage
Budesonide pharmacology
Chlorides metabolism
Epithelial Cells metabolism
Respiratory Mucosa cytology
Subjects
Details
- Language :
- English
- ISSN :
- 1535-4989
- Volume :
- 47
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- American journal of respiratory cell and molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 22798431
- Full Text :
- https://doi.org/10.1165/rcmb.2012-0076OC