Abstract
The breast cancer resistance protein (BCRP, ABCG2) belongs to the superfamily of ATP binding-cassette (ABC) proteins. In addition to other physiological functions, it transports potentially cell-damaging compounds out of the cell using the energy from ATP hydrolysis. Certain tumors overexpressing BCRP were found to become resistant against various anticancer drugs. In previous work, we found that tariquidar analogues lacking the tetrahydroisoquinoline moiety selectively inhibit BCRP. In the present study, we synthesized 21 derivatives of the third-generation P-gp inhibitor HM30181, which is structurally related to tariquidar. The compounds were tested for their inhibitory activities against BCRP and screened against P-glycoprotein (P-gp, ABCB1) and multidrug resistance protein 1 (MRP1, ABCC1) to confirm the selectivity toward BCRP. The most potent compounds are selective toward BCRP and 2-fold more potent than the reference Ko143. Qualitative structure-activity relationship (SAR) analysis revealed that the presence of a methoxy group in the ortho or para position of at least one phenyl ring is beneficial for inhibitory activity. Furthermore, the cytotoxicity and multidrug resistance (MDR)-reversal ability of selected compounds were investigated. It was shown that they have a low cytotoxicity and the ability to reverse the BCRP-mediated SN-38 resistance.
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B / antagonists & inhibitors
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ATP Binding Cassette Transporter, Subfamily G, Member 2
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ATP-Binding Cassette Transporters / antagonists & inhibitors*
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Animals
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Antineoplastic Agents / chemical synthesis
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Antineoplastic Agents / chemistry*
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Antineoplastic Agents / pharmacology
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Benzopyrans / chemical synthesis
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Benzopyrans / chemistry*
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Benzopyrans / pharmacology
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Cell Line, Tumor
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Cell Survival / drug effects
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Dogs
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Drug Resistance, Multiple / drug effects
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Drug Resistance, Neoplasm / drug effects
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Drug Screening Assays, Antitumor
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Isoquinolines / chemical synthesis
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Isoquinolines / chemistry*
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Isoquinolines / pharmacology
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Madin Darby Canine Kidney Cells
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Multidrug Resistance-Associated Proteins / antagonists & inhibitors
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Neoplasm Proteins / antagonists & inhibitors*
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Quantitative Structure-Activity Relationship
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Quinolines / chemistry
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Tetrazoles / chemical synthesis
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Tetrazoles / chemistry*
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Tetrazoles / pharmacology
Substances
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4-oxo-4H-chromene-2-carboxylic acid (2-(2-(4-(2-(6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl)-ethyl)-phenyl)-2H-tetrazol-5-yl)-4,5-dimethoxyphenyl)amide
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ABCB1 protein, human
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ABCG2 protein, human
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ATP Binding Cassette Transporter, Subfamily B
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ATP Binding Cassette Transporter, Subfamily G, Member 2
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ATP-Binding Cassette Transporters
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Antineoplastic Agents
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Benzopyrans
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Isoquinolines
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Multidrug Resistance-Associated Proteins
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Neoplasm Proteins
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Quinolines
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Tetrazoles
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tariquidar
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multidrug resistance-associated protein 1