Osteoprotegerin production by breast cancer cells is suppressed by dexamethasone and confers resistance against TRAIL-induced apoptosis.

Abstract:

:Osteoprotegerin (OPG) is a decoy receptor for receptor activator of NF-kappaB ligand (RANKL) and TNF-related apoptosis-inducing ligand (TRAIL). While RANKL is essential for osteoclastogenesis and facilitates breast cancer migration into bone, TRAIL promotes breast cancer apoptosis. We analyzed the expression of OPG and TRAIL and its modulation in estrogen receptor-positive MCF-7 cells and receptor-negative MDA-MB-231 cells. In both cells, OPG mRNA levels and protein secretion were dose- and time-dependently enhanced by interleukin (IL)-1beta and suppressed by dexamethasone. In contrast to MCF-7 cells, MDA-MB-231 abundantly expressed TRAIL mRNA, which was enhanced by IL-1beta and inhibited by dexamethasone. TRAIL activated pro-apoptotic caspase-3, -7, and poly-ADP-ribose polymerase and decreased cell numbers of MDA-MB-231, but had no effect on MCF-7 cells. Gene silencing siRNA directed against OPG resulted in a 31% higher apoptotic rate compared to non-target siRNA-treated MDA-MB-231 cells. Furthermore, TRAIL induced significantly less apoptosis in cells cultured in conditioned media (containing OPG) compared to cells exposed to TRAIL in fresh medium lacking OPG (P < 0.01) and these protective effects were reversed by blocking OPG with its specific ligand RANKL (P < 0.05). The association between cancer cell survival and OPG production by MDA-MB-231 cells was further supported by the finding, that modulation of OPG secretion using IL-1beta or dexamethasone prior to TRAIL exposure resulted in decreased and increased rate of apoptosis, respectively (P < 0.05). Thus, OPG secretion by breast cancer cells is modulated by cytokines and dexamethasone, and may represent a critical resistance mechanism that protects against TRAIL-induced apoptosis.

journal_name

J Cell Biochem

authors

Rachner TD,Benad P,Rauner M,Goettsch C,Singh SK,Schoppet M,Hofbauer LC

doi

10.1002/jcb.22232

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

106-16

issue

1

eissn

0730-2312

issn

1097-4644

journal_volume

108

pub_type

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