PURPOSE: We have isolated etoposide-resistant prostatic cancer cell lines, P/VP10 and P/VP20, to investigate the multidrug resistance (MDR) mechanism and to find MDR reversal agents. MATERIALS AND METHODS: We examined expression of MDR-related genes and screened reversal agents of MDR in P/VP20 cells. RESULTS: These cells demonstrated a non-P-glycoprotein (P-gp)-mediated MDR phenotype with overexpression of MDR-associated protein (MRP) mRNA due to MRP DNA amplification. A 1,4-dihydropyridine derivative, bis(4-pyridylmethyl)4-[2-(3-methyl-5,6- dihydro-1,4-dithiinyl)]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicar boxylate (NIK250), was found to overcome MDR in P/VP20 cells. CONCLUSIONS: NIK250 might be useful in reversing MDR, which often develops during chemotherapy of advanced or hormone-resistant prostatic cancer.
PURPOSE: We have isolated etoposide-resistant prostatic cancer cell lines, P/VP10 and P/VP20, to investigate the multidrug resistance (MDR) mechanism and to find MDR reversal agents. MATERIALS AND METHODS: We examined expression of MDR-related genes and screened reversal agents of MDR in P/VP20 cells. RESULTS: These cells demonstrated a non-P-glycoprotein (P-gp)-mediated MDR phenotype with overexpression of MDR-associated protein (MRP) mRNA due to MRP DNA amplification. A 1,4-dihydropyridine derivative, bis(4-pyridylmethyl)4-[2-(3-methyl-5,6- dihydro-1,4-dithiinyl)]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicar boxylate (NIK250), was found to overcome MDR in P/VP20 cells. CONCLUSIONS:NIK250 might be useful in reversing MDR, which often develops during chemotherapy of advanced or hormone-resistant prostatic cancer.
Authors: Scott A Steiger; Anthony J Monacelli; Chun Li; Janet L Hunting; Nicholas R Natale Journal: Acta Crystallogr Sect E Struct Rep Online Date: 2014-06-18