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ChemMedChem. 2016 Jun 20;11(12):1380-94. doi: 10.1002/cmdc.201500592. Epub 2016 Mar 10.

Subtle Structural Differences Trigger Inhibitory Activity of Propafenone Analogues at the Two Polyspecific ABC Transporters: P-Glycoprotein (P-gp) and Breast Cancer Resistance Protein (BCRP).

Author information

1
Department of Pharmaceutical Chemistry, Faculty of Life Sciences, University of Vienna, Althanstraße 14, 1090, Vienna, Austria.
2
Department of Medicinal Chemistry, Medical University Vienna, Währingerstraße 10, 1090, Vienna, Austria.
3
Department of Medical Biochemistry, Max F. Perutz Laboratories, Medical University Vienna, Dr. Bohr-Gasse 9/2, 1030, Vienna, Austria.
4
Department of Pharmaceutical Chemistry, Faculty of Life Sciences, University of Vienna, Althanstraße 14, 1090, Vienna, Austria. gerhard.f.ecker@univie.ac.at.

Abstract

The transmembrane ABC transporters P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP) are widely recognized for their role in cancer multidrug resistance and absorption and distribution of compounds. Furthermore, they are linked to drug-drug interactions and toxicity. Nevertheless, due to their polyspecificity, a molecular understanding of the ligand-transporter interaction, which allows designing of both selective and dual inhibitors, is still in its infancy. This study comprises a combined approach of synthesis, in silico prediction, and in vitro testing to identify molecular features triggering transporter selectivity. Synthesis and testing of a series of 15 propafenone analogues with varied rigidity and basicity of substituents provide first trends for selective and dual inhibitors. Results indicate that both the flexibility of the substituent at the nitrogen atom, as well as the basicity of the nitrogen atom, trigger transporter selectivity. Furthermore, inhibitory activity of compounds at P-gp seems to be much more influenced by logP than those at BCRP. Exploiting these differences further should thus allow designing specific inhibitors for these two polyspecific ABC-transporters.

KEYWORDS:

breast cancer resistance protein; inhibitor; p-glycoprotein; polypharmacology; propafenone

PMID:
26970257
PMCID:
PMC4949556
DOI:
10.1002/cmdc.201500592
[Indexed for MEDLINE]
Free PMC Article

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