Indole-3-carbinol synergistically sensitises ovarian cancer cells to bortezomib treatment.

Abstract:

BACKGROUND:Bortezomib is a proteasome inhibitor with minimal clinical activity as a monotherapy in solid tumours, but its combination with other targeted therapies is being actively investigated as a way to increase its anticarcinogenic properties. Here, we evaluate the therapeutic potential of co-treatment with bortezomib and indole-3-carbinol (I3C), a natural compound found in cruciferous vegetables, in human ovarian cancer. METHODS:We examined the effects of I3C, bortezomib and cisplatin in several human ovarian cancer cell lines. Synergy was determined using proliferation assays and isobologram analysis. Cell cycle and apoptotic effects were assessed by flow cytometry. The mechanism of I3C and bortezomib action was determined by RNA microarray studies, quantitative RT-PCR and western blotting. Antitumour activity of I3C and bortezomib was evaluated using an OVCAR5 xenograft mouse model. RESULTS:I3C sensitised ovarian cancer cell lines to bortezomib treatment through potent synergistic mechanisms. Combination treatment with bortezomib and I3C led to profound cell cycle arrest and apoptosis as well as disruptions to multiple pathways, including those regulating endoplasmic reticulum stress, cytoskeleton, chemoresistance and carcinogen metabolism. Moreover, I3C and bortezomib co-treatment sensitised ovarian cancer cells to the standard chemotherapeutic agents, cisplatin and carboplatin. Importantly, in vivo studies demonstrated that co-treatment with I3C and bortezomib significantly inhibited tumour growth and reduced tumour weight compared with either drug alone. CONCLUSION:Together, these data provide a novel rationale for the clinical application of I3C and bortezomib in the treatment of ovarian cancer.

journal_name

Br J Cancer

authors

Taylor-Harding B,Agadjanian H,Nassanian H,Kwon S,Guo X,Miller C,Karlan BY,Orsulic S,Walsh CS

doi

10.1038/bjc.2011.546

subject

Has Abstract

pub_date

2012-01-17 00:00:00

pages

333-43

issue

2

eissn

0007-0920

issn

1532-1827

pii

bjc2011546

journal_volume

106

pub_type

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