Galmarini CM. P-glycoprotein expression by cancer cells affects cell cytotoxicity and cell-cycle perturbations induced by six chemotherapeutic drugs.
JOURNAL OF EXPERIMENTAL THERAPEUTICS AND ONCOLOGY 2002;
2:146-52. [PMID:
12415630 DOI:
10.1046/j.1359-4117.2002.01010.x]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND
P-glycoprotein (P-gp)-mediated chemoresistance plays an important role in drug resistance.
METHODS
We investigated if P-gp expression by cancer cells affects cell cytotoxicity and cell-cycle perturbations induced by six commonly used chemotherapeutic agents (doxorubicin, daunorubicin, mitoxantrone, vinblastine, paclitaxel, and colchicine). For this purpose, we used KB cell lines as a model and flow cytometric cell viability and drug-induced cell-cycle perturbation-based methods. We continuously cultured KB cell lines, in the presence of various anticancer agents and measured the cell-cycle kinetics and percentage of cell viability by flow cytometry at different time intervals.
RESULTS
The highly resistant cell line KB V-1 was significantly less susceptible to drug cytotoxicity than the sensitive cell line KB 3-1. KB V-1 cells cultured with different chemotherapy agents continued cell-cycle progression without any significant perturbation of cell compartment distribution. Addition of verapamil, by inhibiting P-gp, reversed resistance thereby increasing drug cytotoxicity and allowing the appearance of drug induced cell-cycle perturbations.
CONCLUSIONS
We conclude that P-gp interferes with cell cytotoxicity and cell-cycle perturbations induced by anticancer agents. Flow cytometry can be used to conveniently detect P-gp-mediated chemoresistance by cancer cells as it allows the analysis of cell cytotoxicity and cell-cycle modifications after exposure to specific chemotherapeutic and reversal agents.
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