Mechanism of sensitization of MDR cancer cells by Pluronic block copolymers: Selective energy depletion.
Br J Cancer
; 85(12): 1987-97, 2001 Dec 14.
Article
em En
| MEDLINE
| ID: mdl-11747344
ABSTRACT
This paper, for the first time, demonstrates that exposure of cells to the poly(ethylene oxide)-poly(propylene oxide) block copolymer, Pluronic P85, results in a substantial decrease in ATP levels selectively in MDR cells. Cells expressing high levels of functional P-glycoprotein (MCF-7/ADR, KBv; LLC-MDR1; Caco-2, bovine brain microvessel endothelial cells [BBMECs]) are highly responsive to Pluronic treatment, while cells with low levels of P-glycoprotein expression (MCF-7, KB, LLC-PK1, human umbilical vein endothelial cells [HUVECs] C2C12 myoblasts) are much less responsive to such treatment. Cytotoxicity studies suggest that Pluronic acts as a chemosensitizer and potentiates cytotoxic effects of doxorubicin in MDR cells. The ability of Pluronic to inhibit P-glycoprotein and sensitize MDR cells appears to be a result of ATP depletion. Because many mechanisms of drug resistance are energy dependent, a successful strategy for treating MDR cancer could be based on selective energy depletion in MDR cells. Therefore, the finding of the energy-depleting effects of Pluronic P85, in combination with its sensitization effects is of considerable theoretical and practical significance.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Poloxaleno
/
Células-Tronco Neoplásicas
/
Membro 1 da Subfamília B de Cassetes de Ligação de ATP
/
Resistência a Múltiplos Medicamentos
/
Resistencia a Medicamentos Antineoplásicos
/
Metabolismo Energético
/
Proteínas de Neoplasias
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article