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Selective cyclooxygenase inhibitors increase paclitaxel sensitivity in taxane-resistant ovarian cancer by suppressing P-glycoprotein expression / 부인종양
Journal of Gynecologic Oncology ; : 273-279, 2013.
Artigo em Inglês | WPRIM | ID: wpr-58798
ABSTRACT

OBJECTIVE:

The purpose of this study was to investigate whether selective cyclooxygenase (COX) inhibitors promote paclitaxel-induced apoptosis in taxane-resistant ovarian cancer cells by suppressing MDR1/P-glycoprotein (P-gp) expression.

METHODS:

Taxane-resistant ovarian cancer cells were cultured with paclitaxel alone or combined with a selective COX inhibitors. The expression patterns of MDR1/P-gp and the ability of COX inhibitors to inhibit growth of taxane-resistant ovarian cancer cells were measured. The efficacy of prostaglandin E2 (PGE2) supplementation was measured to evaluate the mechanisms involved in suppressing MDR1 gene expression.

RESULTS:

P-gp was upregulated in taxane-resistant ovarian cancer cells compared to paired paclitaxel-sensitive ovarian cancer cells. An 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed that selective COX inhibitors significantly enhanced the cytotoxic effects of paclitaxel in taxane-resistant ovarian cancer cells via a prostaglandin-independent mechanism. These increased apoptotic effects were further verified by measuring an increased percentage of cells in sub-G1 stage using flow cytometry. Selective COX inhibitors suppressed MDR1 and P-gp expression. Moreover, combined treatment with paclitaxel and selective COX inhibitors increased poly (ADP-ribose) polymerase (PARP) cleavage in taxane-resistant ovarian cancer cells.

CONCLUSION:

Selective COX inhibitors significantly promote paclitaxel-induced cell death in taxane-resistant ovarian cancer cells in a prostaglandin-independent manner. COX inhibitors could be potent therapeutic tools to promote paclitaxel sensitization of taxane-resistant ovarian cancers by suppressing MDR1/P-gp, which is responsible for the efflux of chemotherapeutic agents.
Assuntos

Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Neoplasias Ovarianas / Sais de Tetrazólio / Tiazóis / Dinoprostona / Inibidores de Ciclo-Oxigenase / Morte Celular / Prostaglandina-Endoperóxido Sintases / Paclitaxel / Apoptose / Membro 1 da Subfamília B de Cassetes de Ligação de ATP Tipo de estudo: Estudo diagnóstico Idioma: Inglês Revista: Journal of Gynecologic Oncology Ano de publicação: 2013 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Neoplasias Ovarianas / Sais de Tetrazólio / Tiazóis / Dinoprostona / Inibidores de Ciclo-Oxigenase / Morte Celular / Prostaglandina-Endoperóxido Sintases / Paclitaxel / Apoptose / Membro 1 da Subfamília B de Cassetes de Ligação de ATP Tipo de estudo: Estudo diagnóstico Idioma: Inglês Revista: Journal of Gynecologic Oncology Ano de publicação: 2013 Tipo de documento: Artigo