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Reversal of P-glycoprotein and multidrug resistance-associated protein 1 mediated multidrug resistance in cancer cells by HZ08 Isomers, tetrataisohydroquinolin derivatives



Reversal of P-glycoprotein and multidrug resistance-associated protein 1 mediated multidrug resistance in cancer cells by HZ08 Isomers, tetrataisohydroquinolin derivatives



Biological and Pharmaceutical Bulletin 31(6): 1258-1264



Overexpression of P-glycoprotein (Pgp) and multidrug resistance protein 1 (MRP1) by tumors results in multidrug resistance (MDR) to structurally unrelated anti-tumor agents. HZ08, a chiral compound, was a newly synthesized tetraisohydroquinoline derivative to reverse Pgp and MRP1 mediated MDR. In present studies, R, S-HZ08 and their racemate reversed the resistance to adriamycin and vincristine of adriamycin-selected human leukemia (K562/ADM) cells that overexpress Pgp. R, S-HZ08 and their racemate modulated adriamycin cytotoxicity when R, S-HZ08 and their racemate were removed 12 h prior to the cytotoxicity assay. In addition, R, S-HZ08 and their racemate increased intracellular accumulation of Rhodamine123 in Caco-2 cells that overexpress Pgp. Furthermore, using a DNA content analysis and an annexin V binding assay, R, S-HZ08 and their racemate effectively reversed the resistance to adriamycin-induced apoptosis in K562/ADM cells. R, S-HZ08 and their racemate also moderately reversed the resistance to adriamycin and vincristine of MCF-7/ADM cells that overexpress MRP1. However, R, S-HZ08 and their racemate hardly affected intracellular glutathione (GSH) levels and glutathione S-transferase (GST) activities in MCF-7/ADM cells. The result showed that R, S-HZ08 and their racemate possibly reverse MDR1 mediated multidrug resistance by a direct interaction with MRP1, not interaction with MRP1 via GSH. Thus, R, S-HZ08 and their racemate should be useful for treating patients with tumors that overexpress both Pgp and MRP1.

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Accession: 055555276

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PMID: 18520065

DOI: 10.1248/bpb.31.1258


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