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Updated: May 10, 2026
Intratracheal Administration of Dry Powder Formulation in Mice
Published on: July 25, 2020
Fluticasone uptake across Calu-3 cells is mediated by salmeterol when deposited as a combination powder inhaler
Mehra Haghi1, Daniela Traini, Dirkje S Postma
1Respiratory Technology, The Woolcock Institute of Medical Research, Sydney, New South Wales, Australia; Discipline of Pharmacology, School of Medicine The University of Sydney, Sydney, New South Wales, Australia.
Background And Objective:
We assessed whether co-deposition of a long-acting β2 -agonist and a corticosteroid affects their respective transport rates across epithelial cells.
Methods:
Drug particles were deposited on the air-interface culture of Calu-3 cells using a twin-stage impinger. We compared the transport rate of salmeterol and fluticasone across the epithelial cells using commercially available formulations (Serevent, Flixotide and Seretide). The transepithelial resistance of Calu-3 cells was measured before and after each deposition to monitor epithelial resistance.
Results:
The codeposition of salmeterol and fluticasone had no significant effect on transport of salmeterol through the cell layer. In contrast, the rate of fluticasone propionate transport in presence of salmeterol xinofoate was significantly lower (0.53 ± 0.20%) compared with the single fluticasone formulation (2.36 ± 0.97%). Furthermore, the resistance of the epithelial cells was significantly increased after salmeterol deposition from both single and combination products.
Conclusions:
Our data demonstrate that salmeterol may decrease the permeability of epithelial cells, resulting in slower fluticasone transport across Calu-3 epithelial monolayers. The subsequent increased residence time of fluticasone in the airways could prolong its anti-inflammatory effects.
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