Human stromal cells are required for an anti-breast cancer effect of zoledronic acid

被引：6
作者：
Nienhuis, Hilde H. [1 ]
Arjaans, Marlous [1 ]
Timmer-Bosscha, Hetty [1 ]
de Vries, Elisabeth G. E. [1 ]
Schroder, Carolina P. [1 ]
机构：
[1] Univ Groningen, Univ Med Ctr Groningen, Dept Med Oncol, Groningen, Netherlands
来源：
ONCOTARGET | 2015年 / 6卷 / 27期
关键词：
breast cancer; microenvironment; zoledronic acid; TGF-beta; CAM model; RELATIVE AMOUNT; MOUSE; METASTASIS; XENOGRAFTS; MECHANISMS; RESISTANCE;
D O I：
10.18632/oncotarget.4421
中图分类号：
R73 [肿瘤学];
学科分类号：
100214 ;
摘要：
Previous studies suggested that bisphosphonate zoledronic acid exerts an antitumor effect by interacting with the microenvironment. In this study, we aimed to elucidate the mechanism behind the anti-breast cancer effect of zoledronic acid. Here we showed that zoledronic acid did not influence in vitro human breast cancer cell survival, but did affect human stromal cell survival. Breast cancer cell death in co-culture with stromal cells was analyzed in vitro by fluorescent microscopy and flowcytometry analysis. In co-culture, the addition of stromal cells to breast cancer cells induced tumor cell death by zoledronic acid, which was abolished by transforming growth factor (TGF)-beta. In the in vivo chicken chorioallantoic membrane model, zoledronic acid reduced the breast cancer cells fraction per tumor only in the presence of human stromal cells. Zoledronic acid decreased TGF-beta excretion by stromal cells and co-cultures. Moreover, supernatant of zoledronic acid treated stromal cells reduced phospho-Smad2 protein levels in breast cancer cells. Thus, zoledronic acid exerts an anti-breast cancer effect via stromal cells, accompanied by decreased stromal TGF-beta excretion and reduced TGF-beta signaling in cancer cells.
引用
收藏
页码：24436 / 24447
页数：12
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