A study on the biological function of heat shock factor 1 proteins in breast cancer

Wang,Xiaolan; Zhang,Dianlong; Cao,Mingqian; Ba,Jinling; Wu,Bin; Liu,Tao; Nie,Chen

doi:10.3892/ol.2018.9042

A study on the biological function of heat shock factor 1 proteins in breast cancer

Authors:
- Xiaolan Wang
- Dianlong Zhang
- Mingqian Cao
- Jinling Ba
- Bin Wu
- Tao Liu
- Chen Nie
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Affiliations: Department of Breast and Thyroid Surgery, Affiliated Zhongshan Hospital of Dalian University, Dalian, Liaoning 116000, P.R. China
Published online on: June 28, 2018 https://doi.org/10.3892/ol.2018.9042
Pages: 3145-3149

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Abstract

The present study aimed to investigate the effect of HSF1 proteins on cell proliferation, apoptosis and invasion of breast cancer. The Michigan Cancer Foundation‑7 (MCF‑7) HSF1‑knocked down stable cell line (experimental group) and control cell line (control group) were obtained using a lentivirus assay, and the effects of HSF1 knockdown on the proliferation, tumor formation, apoptosis and invasion ability were analyzed, respectively. The effects of HSF1 on downstream signals were analyzed using western blotting. Western blotting results showed that lentivirus successfully established a HSF1 knockdown stable cell line of MCF‑7. Compared with the control group, the growth rate of MCF‑7 cells in the experimental group was significantly decreased (P<0.05). Flow cytometry showed that the proportion of apoptosis in the control group was significantly lower than that of the experimental group (P<0.05). Notably, the invasion ability of cells in the control group was significantly higher than that in the experimental group (P<0.05). Compared with cells in the control group, the levels of heat shock protein (HSP)70, HSP90, anti‑apoptotic protein B‑cell lymphoma 2 (Bcl‑2) and macrophage migration inhibitory factor (MIF) in the experimental group were significantly downregulated, whereas the level of Bax was significantly increased (P<0.05). In conclusion, HSF1 protein, as a transcription factor, regulates the expression levels of HSP70, HSP90, MIF, Bcl‑2 and Bax, thus controlling the proliferation, apoptosis and invasion of cells. These findings suggest HSF1 protein as a potential target for the treatment of breast cancer.

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