Modulation of P-glycoprotein activity in Calu-3 cells using steroids and β-ligands

• Published in: International journal of pharmaceutics Vol. 228; no. 1; pp. 171 - 179
• Main Authors: Hamilton, Karen O, Yazdanian, Mehran A, Audus, Kenneth L
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 09.10.2001; Elsevier
• Subjects: Animals; Anti-Inflammatory Agents - pharmacology; ATP Binding Cassette Transporter, Subfamily B, Member 1 - metabolism; Biological and medical sciences; Calu-3; Cell Line; Dexamethasone - pharmacology; Ethanol; General pharmacology; Glycerol; Humans; Ligands; Medical sciences; Modulation; P-glycoprotein; Palmitoylcarnitine - pharmacology; Pharmaceutical technology. Pharmaceutical industry; Pharmacology. Drug treatments; Progesterone - pharmacology; Rabbits; Radioisotopes; Rhenium; Solvents; Steroids; Steroids - pharmacology; β-ligands; P-glycoprotein; Calu-3; β-ligands; Modulation; Steroids; Human; Corticosteroid; Rhodamine; Dexamethasone; Pharmaceutical technology; Steroid hormone; Biological transport; Antiinflammatory agent; P Glycoprotein; Epithelium; Hydrocortisone; Respiratory system; In vitro; Ovarian hormone; Established cell line; Progesterone; Sex steroid hormone
• ISSN: 0378-5173; 1873-3476
• DOI: 10.1016/S0378-5173(01)00836-5

The purpose of this work was to investigate if P-glycoprotein (Pgp) efflux pump activity could be inhibited in the sub-bronchial epithelial cell line, Calu-3, by glucocorticosteroids and β-ligands. The Pgp modulation efficiency of each compound was determined by its ability to increase the accumulation of the Pgp substrate rhodamine 123 (Rh123) accumulation in these cells. Pgp inhibition was observed at ≥100 μM steroids and β-ligand. The modulation effectiveness of the β-ligands increased with increasing hydrophobicity (log P octanol/aqueous) whereas an obvious correlation was not obtained with the complete set of steroids tested. Steroidal Pgp substrates did not affect Rh123 accumulation (e.g. aldosterone, dexamethasone, 11β, 17α, 21-OH progesterone). In contrast, two hydrophobic non-Pgp steroidal substrates (testosterone and progesterone) displayed different effects on Rh123 accumulation, with progesterone being the more potent modulator. The most hydrophobic β-ligand, propranolol, a known Pgp substrate, gave the largest increase in Rh123 accumulation in this therapeutic class. The β-ligand modulation efficiency could also be correlated to Pgp structural recognition elements such as hydrogen bonding potential, the presence of a basic nitrogen and planar aromatic ring. No effect on Rh123 accumulation was observed with the formulation additives tested (ethanol, glycerol and palmitoyl carnitine) at concentrations previously reported to be non-toxic to Calu-3 cells.