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Dieckol or phlorofucofuroeckol extracted from Ecklonia cava suppresses lipopolysaccharide-mediated human breast cancer cell migration and invasion

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Abstract

The phlorotannin compounds, dieckol and phlorofucofuroeckol (PFF), extracted from Ecklonia cava, have been suggested to exhibit anti-inflammatory, anti-adipogenic or anti-tumorigenic activity. However, role of dieckol or PFF in LPS/TLR-4 signaling that regulates cancer development still remains to be determined. Here we report that dieckol or PFF blocked lipopolysaccharide (LPS)-induced migration and invasion of human breast cancer MCF-7 or MDA-MB-231 cells by about 50% (p < 0.0001) or 60% (p = 0.0001), respectively. Also, PFF as well as dieckol markedly attenuated both of LPS-induced Toll-like receptor4 (TLR-4) expression and NF-κB promoter-driven transcriptional activity, which are essential for the migration and invasion. Moreover, LPS induction of NF-κB-dependent gene, matrix metalloproteinase9 (MMP-9) was markedly decreased about 2.6 or 2.5 fold by dieckol and PFF, respectively. In addition, LPS-induced MMP-2 gene expression was reduced about 1.7 or 2.1 fold by dieckol and PFF, respectively. Significantly, each inhibitor of MMP-9 or NF-κB notably reduced invasion of MDA-MB-231 cells in response to LPS by about 70% (p = 0.0115) or 40% (p < 0.0001), respectively. Collectively, these findings demonstrate that both of dieckol and PFF functions as a critical inhibitor of LPS-induced breast cancer cell invasion through downregulation of TLR-4-NF-κB-MMP-9 signaling axis, suggesting a potential role of the phlorotannins in inflammation-mediated breast cancer development.

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Funding

This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (MSIP) (NRF-2016R1A2B1013313). This work was also supported in part by the Priority Research Centers Program through the NRF funded by the MEST (NRF-2017R1A6A1A03015713).

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Correspondence to Sang-Muk Oh.

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Lee, YJ., Park, JH., Park, SA. et al. Dieckol or phlorofucofuroeckol extracted from Ecklonia cava suppresses lipopolysaccharide-mediated human breast cancer cell migration and invasion. J Appl Phycol 32, 631–640 (2020). https://doi.org/10.1007/s10811-019-01899-2

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