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Diacerein-mediated inhibition of IL-6/IL-6R signaling induces apoptotic effects on breast cancer

Bharti, Rashmi and Dey, Goutam and Ojha, Probir kumar and Rajput, Shashi and Jaganathan, Saravana Kumar and Sen, Ramkrishna and Mandal, Mahitosh (2016) Diacerein-mediated inhibition of IL-6/IL-6R signaling induces apoptotic effects on breast cancer. Oncogene, 35 (30). pp. 3965-3975. ISSN 0950-9232

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Official URL: http://dx.doi.org/10.1038/onc.2015.466

Abstract

Interleukin-6 (IL-6) signaling network has been implicated in oncogenic transformations making it attractive target for the discovery of novel cancer therapeutics. In this study, potent antiproliferative and apoptotic effect of diacerein were observed against breast cancer. In vitro apoptosis was induced by this drug in breast cancer cells as verified by increased sub-G1 population, LIVE/DEAD assay, cell cytotoxicity and presence of terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive cells, as well as downregulation of antiapoptotic proteins Bcl-2 and Bcl-xL and upregulation of apoptotic protein Bax. In addition, apoptosis induction was found to be caspase dependent. Further molecular investigations indicated that diacerein instigated apoptosis was associated with inhibition of IL-6/IL-6R autocrine signaling axis. Suppression of STAT3, MAPK and Akt pathways were also observed as a consequence of diacerein-mediated upstream inhibition of IL-6/IL-6R. Fluorescence study and western blot analysis revealed cytosolic accumulation of STAT3 in diacerein-treated cells. The docking study showed diacerein/IL-6R interaction that was further validated by competitive binding assay and isothermal titration calorimetry. Most interestingly, it was found that diacerein considerably suppressed tumor growth in MDA-MB-231 xenograft model. The in vivo antitumor effect was correlated with decreased proliferation (Ki-67), increased apoptosis (TUNEL) and inhibition of IL-6/IL-6R-mediated STAT3, MAPK and Akt pathway in tumor remnants. Taken together, diacerein offered a novel blueprint for cancer therapy by hampering IL-6/IL-6R/STAT3/MAPK/Akt network.

Item Type:Article
Subjects:R Medicine > RC Internal medicine
Divisions:Biosciences and Medical Engineering
ID Code:69208
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:06 Nov 2017 14:36
Last Modified:20 Nov 2017 16:52

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