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. 1992 Sep;83(9):1011–1017. doi: 10.1111/j.1349-7006.1992.tb02015.x

Potentiation of the Vincristine Effect on P388 Mouse Leukemia Cells by a Newly Synthesized Dihydropyridine Analogue, PAK‐200

Norimasa Shudo 1,2, Ryu‐ichi Fujii 1, Tamotsu Matsumoto 1, Tetsuro Mizoguchi 1, Kiyotomo Seto 2, Ryozo Sakoda 2, Shin‐ichi Akiyama 1,✉
PMCID: PMC5918971  PMID: 1429198

Abstract

A newly synthesized dihydropyridine analogue, 2‐[benzyl(phenyl)amino]ethyl 1,4‐dihydrb‐2,6‐dimethyl‐5‐(5,5‐dimethyl‐2‐oxo‐l,3,2‐dioxaphosphorinan‐2‐yl)‐l‐(2‐morpholinoethyl)‐4‐(3‐nitrophen‐yl)‐3‐pyridinecarboxylate (PAK‐200), at 1 μM completely reversed the resistance to vincristine in vincristine‐resistant P388 mouse leukemia cells (P388/VCR), in vitro. PAK‐200 at 2 μM inhibited the efflux of [3H]vincristine from P388/VCR and increased the accumulation of [3H]vincristine in P388/VCR to a level similar to that in P388 cells. P‐Glycoprotein in membrane vesicles from P388/ VCR cells was photolabeled with [3H]azidopine. The labeling was completely inhibited by 10 μM PAK‐200. The calcium antagonistic activity of PAK‐200 was about 1000 times lower than that of another dihydropyridine analogue, nicardipine. Experiments with P388 and P388/VCR‐bearing mice showed that PAK‐200 enhanced the effect of vincristine on both leukemia cells in vivo. These results suggest that PAK‐200 interacts with P‐glycoprotein and reverses drug resistance in P388 mouse leukemia cells in vitro, and that PAK‐200 has an ability to potentiate the effect of vincristine on P388 mouse leukemia cells in vivo.

Keywords: Key words, Dihydropyridine analogue, PAK‐200, Multidrug resistance, P388 mouse leukemia cell

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