tannins and 6-6--bieckol

Topics: Animals; Anti-Obesity Agents; Cytokines; Diet; Dioxins; Disease Models, Animal; Hypertrophy; Inflammation; Ligands; Macrophages; Mice; Obesity; Phaeophyceae; Phloroglucinol; Plant Extracts; Pyrogallol; Receptor for Advanced Glycation End Products; Tannins

Blood circulation disorders, such as hyperlipidemia and arteriosclerosis, are not easily cured by dietary supplements, but they can be mitigated. Although

Topics: Animals; Apoptosis Regulatory Proteins; Blood Circulation; Blood Pressure; Cell Adhesion Molecules; Cell Line; Cell Movement; Cell Proliferation; Cell Survival; Diet; Dioxins; Ginkgo biloba; Hypertension; Mice; Mice, Inbred C57BL; Models, Animal; Obesity; Phaeophyceae; Phloroglucinol; Plant Extracts; Pyrogallol; RNA, Messenger; Signal Transduction; Tannins

We investigated the effect of Ecklonia cava (E. cava)-derived dieckol on movement behavior and the expression of migration-related genes in MCF-7 human breast cancer cell. Phlorotannins (e.g., dieckol, 6,6'-biecko, and 2,7″-phloroglucinol-6,6'-bieckol) were purified from E. cava by using centrifugal partition chromatography. Among the phlorotannins, we found that dieckol inhibited breast cancer cell the most and was selected for further study. Radius™-well was used to assess cell migration, and dieckol (1-100 µM) was found to suppress breast cancer cell movement. Metastasis-related gene expressions were evaluated by RT-PCR and Western blot analysis. In addition, dieckol inhibited the expression of migration-related genes such as matrix metalloproteinase (MMP)-9 and vascular endothelial growth factor (VEGF). On the other hand, it stimulated the expression of tissue inhibitor of metalloproteinase (TIMP)-1 and TIMP-2. These results suggest that dieckol exerts anti-breast cancer activity via the regulation of the expressions of metastasis-related genes, and this is the first report on the anti-breast cancer effect of dieckol.

Topics: Antineoplastic Agents; Benzofurans; Breast Neoplasms; Cell Movement; Cell Survival; Dioxanes; Dioxins; Drug Discovery; Female; Gene Expression Regulation, Neoplastic; Humans; Matrix Metalloproteinase 9; MCF-7 Cells; Neoplasm Proteins; Pacific Ocean; Phaeophyceae; Phloroglucinol; Republic of Korea; Seaweed; Tannins; Tissue Inhibitor of Metalloproteinase-1; Tissue Inhibitor of Metalloproteinase-2; Vascular Endothelial Growth Factor A

Seven phlorotannins were isolated and characterized from an edible marine brown alga Ecklonia cava (EC), along with three common sterol derivatives (fucosterol, ergosterol, and cholesterol) according to the comprehensive spectral analysis of MS and NMR data. Compounds 5 (7-phloro eckol) and 7 (6,6'-bieckoll) of phlorotannin derivatives were obtained for the first time with the high yields. No reports of compound 3 (Fucodiphloroethol G) was published up to date. The antioxidant properties of all phlorotannins were assessed by total antioxidant activity in a linoleic acid model, free radicals scavenging assay using electron spin resonance spectrometry (ESR) technique, cellular reactive oxygen species (ROS) assay by DCFH-DA, membrane protein oxidation assay; measurement of cellular glutathione (GSH) level in RAW264.7 cell line, and myeloperoxidase (MPO) assay in HL-60 cell line. The results revealed that all phlorotannins had antioxidant properties in vitro, especially, compounds 7 (6,6'-bieckol), 6, and 3 showed the significant activities compared to the other phlorotannins. Furthermore, the structure-activity relationship (SAR) was discussed based on the structural differences of the tested phlorotannins which have polymeriged phloroglucinal units with diverse skeletons and linkages. It could be suggested that phlorotaninns from this genus would be more potential candidates for the development of unique natural antioxidants for further industrial applications as functional foods, cosmetics and pharmaceuticals. As well as our results makes it clear to understand the reason behind the use of EC as traditional folk herb for a long history.

Topics: Animals; Antioxidants; Cell Line; Dioxins; Free Radical Scavengers; HL-60 Cells; Humans; Mice; Phaeophyceae; Reactive Oxygen Species; Sterols; Structure-Activity Relationship; Tannins