Expression of Krüppel‑like factor 4 in breast cancer tissues and its effects on the proliferation of breast cancer MDA‑MB‑231 cells

Song,Xiang; Xing,Yue‑Ming; Wu,Wei; Cheng,Guo‑Hua; Xiao,Feng; Jin,Gang; Liu,Ying; Zhao,Xin

doi:10.3892/etm.2017.4262

Expression of Krüppel‑like factor 4 in breast cancer tissues and its effects on the proliferation of breast cancer MDA‑MB‑231 cells

Authors:
- Xiang Song
- Yue‑Ming Xing
- Wei Wu
- Guo‑Hua Cheng
- Feng Xiao
- Gang Jin
- Ying Liu
- Xin Zhao
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Affiliations: Department of Oncology, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, P.R. China
Published online on: March 24, 2017 https://doi.org/10.3892/etm.2017.4262
Pages: 2463-2467

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Abstract

The aim of the present study was to detect the expression of Krüppel‑like factor 4 (KLF4) in breast cancer tissues and to evaluate the effect on the proliferation of breast cancer MDA‑MB‑231 cells. The expression of KLF4 protein in 239 breast cancer tissues and 40 paracancerous tissues were detected by an immunohistochemical assay, and its correlation with clinical pathological parameters was analyzed. A eukaryotic expression vector, pcDNA3.1‑KLF4, was constructed by transient transfection of breast cancer MDA‑MB‑231 cells with liposomes (experimental group). The untransfected cells and those transfected with empty plasmid pcDNA3.1 were used as the blank and negative control groups, respectively. The expression of the KLF4 gene and protein in the three groups were detected by reverse transcription polymerase chain reaction and western blotting, respectively. Furthermore, the cell proliferative capacity was detected by an MTT assay. The positive expression rate of KLF4 protein in breast cancer tissues (39.0%, 93/239) was significantly lower than that of paracancerous tissues (77.5%, 31/40) (P<0.05). In addition, KLF4 protein expression in breast cancer tissues was correlated with pathological type, histological grade and lymphatic metastasis (P<0.05). KLF4 mRNA and protein were both expressed by the experimental group, but not by the two control groups. Meanwhile, the proliferative capacity of the experimental group was also significantly decreased. A significant decrease in the positive expression rate of KLF4 protein in breast cancer tissues was correlated with several clinical pathological parameters. In addition, transfection of the KLF4 gene inhibited the proliferation of breast cancer cells, suggesting that this gene is important in the onset and progression of this type of cancer.

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