Curcumol triggers apoptosis of p53 mutant triple-negative human breast cancer MDA-MB 231 cells via activation of p73 and PUMA

Huang,Lanzhen; Li,Ang; Liao,Guanzhen; Yang,Feicheng; Yang,Jing; Chen,Xu; Jiang,Xiaoshan

doi:10.3892/ol.2017.6273

Curcumol triggers apoptosis of p53 mutant triple-negative human breast cancer MDA-MB 231 cells via activation of p73 and PUMA

Authors:
- Lanzhen Huang
- Ang Li
- Guanzhen Liao
- Feicheng Yang
- Jing Yang
- Xu Chen
- Xiaoshan Jiang
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Affiliations: Center for Science Research, Guilin Medical University, Guilin, Guangxi 541004, P.R. China, School of Pharmacy, Guilin Medical University, Guilin, Guangxi 541004, P.R. China
Published online on: May 29, 2017 https://doi.org/10.3892/ol.2017.6273
Pages: 1080-1088

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Abstract

Triple-negative breast cancer (TNBC; estrogen receptor-negative, progesterone receptor‑negative and Her‑2‑negative) is often accompanied by a higher frequency of p53 gene mutations. Therefore, TNBC is challenging to treat due to a lack of biological targets and a poor sensitivity to conventional therapies. Curcumol is a monomer composition isolated from the ethanol extracts of Curcuma wenyujin, a Chinese medicinal herb traditionally used as a cancer remedy. Previous studies have revealed that curcumol is able to block proliferation in various human tumor cell lines. However, the underlying mechanisms have yet to be elucidated. The present study aimed to investigate the anticancer effects of curcumol in the human p53 mutant TNBC MDA‑MB‑231 cell line and its underlying mechanisms. Cell viability and growth were determined by MTT and a mice xenograft model assay, respectively. Cell cycle distribution was examined by flow cytometry. Apoptosis was evaluated by apoptotic morphology analysis with DAPI staining and flow cytometric analysis following Annexin V/propidium iodide staining. The protein expression in cells was evaluated by immunoblotting. Treatment of MDA‑MB‑231 cells with curcumol resulted in a significant inhibition of cell proliferation in vitro [half maximal inhibitory concentration (IC50)=240.7±85.0 µg/ml for 48 h and IC50=100.2±13.5 µg/ml for 72 h]. Curcumol treatment also resulted in the suppression of xenograft growth in vivo (100 or 200 µg/kg for 21 days), as well as G1 phase arrest and an apoptotic response, which were accompanied by the upregulation of p73 expression and the activation of the expression of p53 upregulated modulator of apoptosis (PUMA) and Bcl‑2 antagonistic killer (Bak). No cleavage of poly (ADP‑ribose) polymerase was detected. To the best of our knowledge, the present data demonstrate for the first time that curcumol inhibits the growth of MDA‑MB‑231 cells and triggers p53‑independent apoptosis, which may be mediated by the p73‑PUMA/Bak signaling pathway. Curcumol may, therefore, be a potential compound for use in the development of novel TNBC therapeutics.

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