Death receptor-dependent and -independent pathways in anticancer drug-induced apoptosis of breast cancer cells.

Abstract:

:Apoptosis is a crucial event for anticancer drug efficacy. The signal pathways activated by anticancer drugs are classified as death receptor (DR) -dependent or -independent. The mechanisms by which anticancer drugs induce apoptosis via DR-dependent pathways are not fully understood. In the present study, we assessed differential activation of signal transduction pathways leading to apoptosis by anticancer drugs in breast cancer cell lines. Three breast cancer cell lines, MDA-MB-231, MCF-7, and MCF-7ADM, which is drug-resistant, were used. Drug sensitivity and apoptosis were assessed by MTT assay and TUNEL, respectively. Expression of apoptosis-related protein was assessed by Western blotting and RT-PCR. The sensitivities of MDA-MB-231 and MCF-7 cells to mitomycin C (MMC) and adriamycin (ADM) were similar. In contrast, sensitivity of MDA-MB-231 cells to paclitaxel (TXL) was 30-fold greater than that of MCF-7 cells, 0.03 micro M in MDA-MB-231 and 0.9 micro M in MCF-7 cells, respectively. Treatment with MMC increased expression of DR4 and Fas in a time-dependent manner in MDA-MB-231 cells. Treatment with ADM increased expression of DR4 and DR5 but not Fas, whereas treatment with TXL increased expression of Fas but not DR4 and DR5 in MDA-MB-231 cells. Although treatment of MCF-7 cells with ADM increased expression of DR4 and DR5 but not Fas, expression of DR4, DR5, and Fas by the drug-resistant cells did not change following treatment with ADM. Activation of Fas, DR4, and DR5 in drug-sensitive cells in response to anticancer drugs is dependent on the cytotoxic effect of each drug. In drug-resistant cells, apoptosis is induced via DR-independent pathways mediated by mitochondrial dysfunction.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Kim R,Tanabe K,Emi M,Uchida Y,Toge T

keywords:

subject

Has Abstract

pub_date

2003-11-01 00:00:00

pages

1925-30

issue

6

eissn

1021-335X

issn

1791-2431

journal_volume

10

pub_type

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