Osteoprotegerin (OPG) protects ovarian cancer cells from TRAIL-induced apoptosis but does not contribute to malignant ascites-mediated attenuation of TRAIL-induced apoptosis

Journal of Ovarian Research

Alain Piché¹  Claudine Rancourt¹  Isabelle Matte¹  Denis Lane¹ 

[1] Département de Microbiologie et Infectiologie, Université de Sherbrooke, 3001 12ième Avenue Nord, Sherbrooke, J1H 5N4, Canada

关键词: Apoptosis;    Ascites;    Resistance;    Ovarian carcinoma;    TRAIL;    Osteoprotegerin;   

Others  :  814859
DOI  :  10.1186/1757-2215-5-34

 received in 2012-09-06, accepted in 2012-11-07,  发布年份 2012

【 摘 要 】

Background

Resistance to apoptosis is a major problem in ovarian cancer and correlates with poor prognosis. Osteoprotegerin (OPG) is a secreted factor in malignant ascites and acts as a decoy receptor for receptor activator of NF-κB ligand (RANKL) and tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). TRAIL promotes apoptosis in ovarian cancer cells. Ovarian cancer ascites attenuate TRAIL-induced apoptosis raising the possibility that OPG contained in ascites may abrogate the anti-tumor activity of TRAIL.

Methods

Determination of OPG levels in ascites was measured by ELISA. Effect of OPG on TRAIL-induced cell death was determined by XTT and colony forming assays in ovarian cancer cell lines and primary tumor cells. Apoptosis was assessed by ELISA.

Results

We found that recombinant OPG and malignant ascites attenuates TRAIL-induced cell death and apoptosis in a dose-dependent manner in ovarian cancer cell lines and primary ovarian tumor cells. OPG is present at high levels in the ascites of patients with ovarian cancer. We found a positive correlation between the levels of OPG in ascites and the ability of the ascites to attenuate TRAIL-induced cell death. The anti-apoptotic effect of ascites was not reversed by co-incubation with an OPG blocking antibody.

Conclusions

OPG and malignant ascites protect ovarian cancer cells from TRAIL-induced apoptosis. Although malignant ascites contain high levels of OPG, OPG is not a critical component that contributes to ascites-mediated attenuation of TRAIL-induced apoptosis.

【 授权许可】

   
2012 Lane et al.; licensee BioMed Central Ltd.

【 图 表 】

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