Nongenomic effects of fluticasone propionate and budesonide on human airway anion secretion

Takefumi Mizutani, Masahiro Morise, Yasushi Ito, Yoshitaka Hibino, Tadakatsu Matsuno, Satoru Ito, Naozumi Hashimoto, Mitsuo Sato, Masashi Kondo, Kazuyoshi Imaizumi, Yoshinori Hasegawa

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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 (ISC) in human airway Calu-3 epithelial cells. The FP-induced ISC 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 HCO3 2-dependent anion transporters)-sensitive components, both of which reflect basolateral anion transport. Further, FP augmented apical membrane Cl - current (ICl), reflecting cystic fibrosis transmembrane conductance regulator (CFTR)-mediated conductance, in the nystatin-permeabilized monolayer. In ISC and ICl 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 cAMPproduction, 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.

Original languageEnglish
Pages (from-to)645-651
Number of pages7
JournalAmerican Journal of Respiratory Cell and Molecular Biology
Volume47
Issue number5
DOIs
Publication statusPublished - 01-11-2012

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All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry
  • Cell Biology

Cite this

Mizutani, T., Morise, M., Ito, Y., Hibino, Y., Matsuno, T., Ito, S., Hashimoto, N., Sato, M., Kondo, M., Imaizumi, K., & Hasegawa, Y. (2012). Nongenomic effects of fluticasone propionate and budesonide on human airway anion secretion. American Journal of Respiratory Cell and Molecular Biology, 47(5), 645-651. https://doi.org/10.1165/rcmb.2012-0076OC