Background and purpose: Factor that binds to the inducer of short transcripts of human immunodeficiency virus-1 (FBI-1) in a variety of malignant tumors showed high expression levels

which may be closely related to tumor proliferation and differentiation

angiogenesis

metastasis

but its relationship with breast cancer has not been fully elucidated. The purpose of this study was to investigate the expression of FBI-1 in breast cancer cells

and to study the effect of FBI-1 gene expression on the proliferation of breast cancer cells and its possible mechanism. Methods: Real-time fluorescent quantitative polymerase chain reaction (RTFQ-PCR) and Western blot analysis were applied to detect FBI-1 expression in normal human mammary epithelial cell line MCF-10A and breast cancer cell MCF-7. RNA interference method was used to down-regulate FBI-1 expression in MCF-7 cells. The cell proliferation was measured by CCK-8 kit and colony formation assay. RTFQ-PCR and Western blot were used to detect the expression of FBI-1 and NF-κBp65 in MCF-7 cells before and after the interference of FBI-1 expression. Results: The expression of FBI-1 was higher in breast cancer cells than that in normal human mammary epithelial cells (P0.05). The effects of FBI-1 down-regulation inhibited proliferation in MCF-7 cells (P0.05). At the same time

after inhibition of FBI-1

the NF-κBp65 mRNA and protein expression levels were significantly decreased (P0.05). Conclusion: FBI-1 is highly expressed in breast cancer cells. Down-regulated FBI-1 expression can inhibit the proliferation of breast cancer cells

 and its mechanism may be related to the inhibition of NF-κB signaling pathway.